GH SERIES
Analytical Balance

GH-120GH-200GH-300GH-202GH-252

1WMPD4000891F

© 2019 A&D Company Ltd. All rights reserved.
No part of this publication may be reproduced, transmitted, transcribed, or translated into
any language in any form by any means without the written permission of A&D Company
Ltd.
The contents of this manual and the specifications of the instrument covered by thismanual are subject to change for improvement without notice.

Windows, Word and Excel are registered trademarks of the Microsoft Corporation.

Contents
1. Introduction ............................................................................................................................................... 5
1-1. Features ............................................................................................................................................. 5
1-2. Compliance ........................................................................................................................................ 5
1-2-1 Compliance With FCC Rules .....................................................................................................5
2. Unpacking the Balance ............................................................................................................................. 6
2-1. Installing the Balance ......................................................................................................................... 7
3. Precautions ............................................................................................................................................... 9
3-1. Before Use ......................................................................................................................................... 9
3-2. During Use ......................................................................................................................................... 9
3-3. After Use............................................................................................................................................ 11
3-4. Power Supply .................................................................................................................................... 11
4. Display Symbols and Key Operation ...................................................................................................... 12
5. Weighing Units ........................................................................................................................................ 13
5-1. Units ................................................................................................................................................ 13
5-2. Changing the Units ........................................................................................................................... 16
5-2-1 Unit setting example ............................................................................................................... 17
6. Weighing ................................................................................................................................................. 18
6-1. Basic Operation (Gram Mode) ......................................................................................................... 18
6-2. Dual Range ...................................................................................................................................... 19
6-3. Counting Mode (PCS) ...................................................................................................................... 20
6-4. Percent Mode (%) ............................................................................................................................ 22
7. Response Adjustment ............................................................................................................................. 23
7-1. Automatic Response Adjustment ..................................................................................................... 23
7-2. Manual Response Adjustment ......................................................................................................... 24
8. Calibration ............................................................................................................................................... 25
8-1. Calibration Group ............................................................................................................................. 25
8-2. Automatic Self Calibration ................................................................................................................ 26
8-3. One-Touch Calibration ..................................................................................................................... 27
8-4. Calibration Test Using the Internal Mass ......................................................................................... 28
8-5. Calibration Using an External Weight .............................................................................................. 29
8-6. Calibration Test Using an External Weight ....................................................................................... 30
8-7. Correcting the Internal Mass Value .................................................................................................. 31
9. Function Switch and Initialization ........................................................................................................... 32
9-1. Permit or Inhibit ................................................................................................................................ 32
9-2. Initializing the Balance ..................................................................................................................... 33
10. Function Table ...................................................................................................................................... 34
10-1. Setting the Function Table ............................................................................................................. 34
10-2. Details of the Function Table .......................................................................................................... 36
10-3. Description of the Class "Environment, Display" ........................................................................... 39
10-4. Description of the Item "Data Output Mode" .................................................................................. 403

10-5. Description of the Item "Data Format" ........................................................................................... 42
10-6. Data Format Examples .................................................................................................................. 45
10-7. Clock and Calendar Function ......................................................................................................... 47
11. ID Number and GLP Report.................................................................................................................. 49
11-1. Setting the ID Number .................................................................................................................... 49
11-2. GLP Report..................................................................................................................................... 50
12. Data Memory ........................................................................................................................................ 55
12-1. Notes on Using Data Memory ........................................................................................................ 55
12-2. Data Memory for Weighing Data .................................................................................................... 56
12-3. Data Memory for Calibration and Calibration Test ......................................................................... 59
13. Underhook ............................................................................................................................................ 61
14. Density Measurement ........................................................................................................................... 62
15. Standard Input and Output Interface .................................................................................................... 65
15-1. RS-232C Interface ......................................................................................................................... 65
15-2. External Contact Input.................................................................................................................... 66
15-3. Connection to Peripheral Equipment ............................................................................................. 67
15-4. Commands ..................................................................................................................................... 70
15-4-1 Command List ....................................................................................................................... 70
15-4-2 Acknowledge Code and Error Codes .................................................................................... 71
15-4-3 Control Using CTS and RTS ................................................................................................. 71
15-4-4 Settings Related to RS-232C ................................................................................................ 71
15-4-5 Command Examples ............................................................................................................. 72
15-4-6 The Example of Weighing with a Tare .................................................................................. 74
15-4-7 The Example of Setting a Negative Target Value and Filling with a Sample until the Display Becomes Zero ... 75
16. Maintenance ......................................................................................................................................... 76
16-1. Treatment of the Balance ............................................................................................................... 76
16-2. Error Codes .................................................................................................................................... 76
16-3. Other Display ................................................................................................................................. 78
16-4. Checking the Balance Performance and Environment .................................................................. 79
16-5. Asking for Repair ............................................................................................................................ 80
17. Specifications ........................................................................................................................................ 81
17-1. External Dimensions ...................................................................................................................... 82
17-2. Options and Peripheral Equipment ................................................................................................ 83
18. Terms ................................................................................................................................................... 87

4

1. Introduction
This manual describes how the balances of GH series work and how to get the most out of them interms of performance. Read this manual thoroughly before using the balance and keep it at hand for
future reference.

1-1. Features
Automatic self calibration, using the internal mass, adapting to changes in temperature.
Response adjustment adapting to drafts and/or vibration automatically.
Memory function to store weighing data and calibration data.
When weighing data is stored only, 200 data can be stored in maximum.
Interval memory mode to store the weighing data periodically.
Good laboratory practice (GLP) / Good manufacturing practice (GMP) data can be output using
the RS-232C serial interface.
A built-in clock and calendar that can add the time and date to the output data.
Underhook, for measuring density and weighing magnetic materials.
Multiple weighing units with most of the common units used around the world.
Density mode for calculating the density of a solid.
Standard RS-232C serial interface to communicate with a computer.
Windows communication tools software (WinCT) to allow easy communication with a computer using
Windows. The current version of the WinCT can be downloaded from the A&D website.
When multiple balances have the GH-08 Ethernet interface installed and are connected to a LAN, data
can be acquired from them using the WinCT-Plus software.

1-2. Compliance1-2-1 Compliance With FCC Rules
Please note that this equipment generates, uses and can radiate radio frequency energy. Thisequipment has been tested and has been found to comply with the limits of a Class A computing
device pursuant to Subpart J of Part 15 of FCC rules. These rules are designed to provide reasonable
protection against interference when equipment is operated in a commercial environment. If this unit
is operated in a residential area, it may cause some interference and under these circumstances theuser would be required to take, at his own expense, whatever measures are necessary to eliminate
the interference.
(FCC = Federal Communications Commission in the U.S.A.)5

2. Unpacking the Balance

Unpack the balance carefully. Keep the packing material to be used for transporting the balance in the future.
See the illustrations to confirm that everything is included.

Fine range breeze break ringThis ring is an accessory for the
GH-252 and GH-202. Before
weighing with a readability of 0.01
mg, install this ring in place of the"breeze break ring" to avoid errors
caused by drafts.

Weighing chamber
Weighing pan
Pan support
Breeze break ring
Dust plate

Dust plate forGH-252 and GH-202

Floor plate
Leveling footBubble spirit level

Keys
Display

Tweezers (AD-1689)
This tweezer is for handling a weight.
Use it to avoid temperature changes due tohaving your hand in the weighing chamber,thus to perform accurate calibration.

Display cover
AC adapter jack
External Key Jack

Serial number(side)

Serial interface(RS-232C, D-sub 9 pins)

Position of placing
AC adapter labels

AC adapter labels

Terminal coverAttach the AC adapter labels
to the AC adapter as shownin the illustration

AC adapter
Note:Please confirm that the AC adapter
type is correct for your local
voltage and receptacle type.

Grounding terminal
6

Leveling foot2-1. Installing the Balance
Install the balance as follows:
1. Consider the section "3. Precautions" for installing your balance. Place the balance on a firm weighing table.
2. Assemble the weighing pan and other parts in accordance with the model and use as shown below.
GH-300, GH-200, GH-120

GH-202, GH-252
Fine range ring

Weighing pan

Dust plate forGH-252/202

Pan support
Breeze break ring

Fine range ring

Dust plate

Note
The mounting
direction of thedust plate.

Sectional view

Use the fine range ring in place of the breeze break ring to avoid
errors caused by drafts when weighing with a readability of 0.01 mg.

3. Refer to “2. Unpacking the Balance” on the previous
page to assemble the dust plate and breeze break ring,or fine range ring, pan support and weighing pan in theweighing chamber.
4. Adjust the level of the balance using the leveling feet.
Ground the balance chassis for discharging static
electricity if you have a static problem.

Leveling feet
Bubble spirit level

5. Please confirm that the adapter type is correct for your local
voltage and power receptacle type.
6. Connect the AC adapter to the balance. Warm up the balance
for at least one hour with nothing on the weighing pan.
7. Calibrate the balance before use. Refer to "8. Calibration".

Connect theAC adapter
Note
Please use the dedicated AC adapter specified for the balance.
Do not use the AC adapter provided with the balance for other models or equipment with which the
AC adapter may not be compatible.
If you use the wrong AC adapter, the balance and other equipment may not operate properly.
7Adjusting the level
When the bubble is off to the left:

When the bubble is off to the right:

Turn the leveling foot on the rear right in theTurn the leveling foot on the rear left in the clockwise

clockwise direction.

direction.

Level

Level

When the bubble is off to the backward position:

When the bubble is off to the forward position:

Turn both leveling feet on the rear in theTurn both leveling feet on the rear in the clockwise

counterclockwise direction at the same time.

direction at the same time.

Level

Level

Red circle
BubbleBubble spirit level

OKNO

Red circle

8

3. Precautions
3-1. Before Use
To ensure that you get the most from your balance, please try to follow these conditions as closely as
possible.
Please confirm that the AC adapter type is correct for your local voltage and receptacle type.
Ensure a stable power source when using the AC adapter.
The best operating temperature is about 20°C / 68°F at about 50% Relative Humidity.
The weighing room should be free of dust.
The weighing table should be solid and free from vibration, drafts (such as frequently opening doors or
windows) and as level as possible.
Corners of rooms are best as they are less prone to vibration.
Do not install the balance near a heater or air conditioner.
Do not install the balance in direct sunlight.
Do not use the balance near other equipment which produces magnetic fields.
Adjust the level of the balance using the leveling feet.
Please warm-up the balance for at least one hour. Plug-in the AC adapter as usual.
Calibrate the balance before using and after moving it to another location.
Do not place or use the balance where there is flammable or corrosive gas present.

3-2. During Use
Note the following items to get accurate weighing data.

Metal case
Weighing errors may occur due to the influence of static Charged material
electricity. Note that if the ambient humidity drops below 45%RH,
insulators such as plastics are liable to have static electricity.
Ground the balance and perform the following as needed.
Eliminate the static electricity using the optional AD-1683A.
Try to keep the ambient humidity above 45%RH at the room.

Grounding

Use a metal shield case.
Wipe a charged material (plastic sample etc.) with a damp cloth.

Influence of magnetism may cause weighing errors. Whenmeasuring magnetic materials (irons, etc.), keep the sample awayfrom the balance main body by means such as underhook
weighing.
9Magnet material

Eliminate temperature differences between the weighed sample and theenvironment. When a sample is warmer (cooler) than the ambient
temperature, the sample will appear lighter (heavier) than the true mass.
This error is due to the rising (falling) draft next the sample. If you touch thesample, the same type error will occur. Do not touch the sample directlywith your hand. Use tweezers or other tools.

Draft
20°C 40°C
Weighing pan

Make each weighing gently and quickly to avoid errors due to changes inthe environmental conditions.

Before weighing with a readability of 0.01 mg for the GH-252 and GH-202,
the "fine range breeze break ring" can be installed in place of the "breeze
break ring" to avoid errors caused by drafts.

Do not drop things upon the weighing pan, or place a weight beyond therange of the balance on the weighing pan.

Do not use a sharp instrument (such as a pencil or ball point pen) to press
the keys, use your finger only.

Press theerrors.

RE-ZERO

key before each weighing to prevent possible

Take into consideration the effect of air buoyancy on a sample when moreaccuracy is required.
Avoid foreign matter (dust, liquid or metal fragments) that could get inside
the balance.

10

Fine range breeze
break ringShock

3-3. After Use
Avoid mechanical shock to your balance.
Do not disassemble the balance. Contact your local A&D dealer if yourbalance needs service or repair.
Do not use solvents to clean the balance. For best cleaning, wipe with a dry
lint free cloth or a lint free cloth that is moistened with warm water and a mild
detergent.
Avoid foreign matter (dust, liquid or metal fragments) that could get inside
the balance.

3-4. Power Supply
Do not remove the AC adapter while the internal mass is in motion, for example, right after the AC
adapter is connected, or during calibration using the internal mass.
If the AC adapter is removed under the conditions described above, the internal mass will be left
unsecured, that may cause mechanical damage when the balance is moved.
Before removing the AC adapter, press the ON:OFF key and confirm that zero is displayed inweighing mode.
When the AC adapter is connected, the balance is in the standby mode if the standby indicator ison. This is a normal state and does not harm the balance. For accurate weighing, we recommendthat you always plug in your balance so it can warm up.

11

4. Display Symbols and Key Operation
Display

The amount of stored data withmemory data function
Response indicator(Displayed for about 30 seconds
when weighing starts.)

Processing indicator

Units

Stabilization indicatorStandby indicator of
power supply

Standby indicator of Interval
memory function
Weighing data or
stored data

The current
data number
Prior notice indicator of
automatic self calibration

Blinking indicators

Interval memory,
active indicator

Key operation
Press and release the key immediately" or "Click the key"Press and hold the key (for approx. 2 seconds)

Key

When pressed and heldWhen pressed and released(for approx. 2 seconds)
The key to turn the display ON and OFF. The standby indicator is displayed when the display isturned off. The weighing mode is enabled when the display is turned on. This key is available
anytime. Pressing the key during operation will interrupt the operation and turn the display OFF.
In the weighing mode, the key to turn thereadability ON and OFF.
The key to enter the function table mode.
In the counting or percent mode, the key to Refer to "10. Function Table".
enter the sampling mode.
The key to switch the preset weighing units stored The key to perform automatic responsein the function table. Refer to "5. Weighing Units".
adjustment.
The key to perform calibration using the internal The key to display other items of the
mass.
calibration menu.
No function. (factory setting)
The key to outputs the weighing data to a printer
By changing the function table:or personal computer (or store it in memory)"Title block" and "End block" fordepending on the function table settings.
GLP/GMP report are output.
(Factory setting = output)
The data memory menu is displayed.
The key to set the display to zero.

12

5. Weighing Units
5-1. Units
All weighing units and weighing modes are as follows:
Percent mode

Counting mode
g

mg

pcs

%

oz

ozt

ct

d

m

t

tl

GN

dwt

mom

Density mode
To use this mode, it must be stored in the function table as described on page 14. For
details about this mode, refer to "14. Density Measurement".
To select this mode, press the MODE key until the processing indictor
blinks withthe unit "g" displayed.
A unit or mode can be selected and stored in the function table as described in "5-2. Changing theUnits".
If the law in your area permits, you may use all of the units. You can disable the units that you don't
regularly use. And you are able to turn them back on.
If a weighing mode (or unit of mass) has been turned off, that mode or unit will be missing in thesequence. Tael has four varieties, one of which can be selected and installed at the factory.
To select a unit or mode for weighing, press the MODE key.
For details about the units and modes, see the table below:
Name (unit, mode)

Abbreviation

Display unit

Conversion factor

Gram

g

1g

Milligram

mg

0.001 gCounting mode

pcs-

Percent mode%-

Ounce (Avoir)oz

28.349523125 g

Troy Ounceozt

31.1034768 g

Metric Carat

ct

0.2 g

Momme

mom

3.75 gPennyweightdwt

1.55517384 g

Grain (UK)GN

0.06479891 g

Tael (HK general, Singapore)
Tael (HK jewelry)
Tael (Taiwan)

37.7994 g
37.429 gtl

37.5 gTael (China)

31.25 gTola (India)t

11.6638038 g

Messghalm

4.6875 g

Density modedRefer to "14. Density Measurement"

13

The tables below indicate the weighing capacity and the readability for each unit, depending on thebalance model.

Unit
Gram

GH-252Standard range
Capacity
Readability

Precision range
Capacity
Readability

250

0.0001101

0.00001

2500000.1

1010000.01

Ounce (Avoir)

8.82

0.00001

3.56

0.000001

Troy Ounce

8.04

0.00001

3.25

0.000001

Metric Carat

1250

0.001

505

0.0001

Momme

66.7

0.000126.9

0.00001

Pennyweight

160.8

0.000164.9

0.00001

Grain (UK)

3858

0.002

1559

0.0002

Tael (HK general, Singapore)

6.61

0.00001

2.67

0.000001

Tael (HK jewelry)

6.68

0.00001

2.70

0.000001

Tael (Taiwan)

6.67

0.00001

2.69

0.000001

Tael (China)

8.00

0.00001

3.23

0.000001

Tola (India)

21.43

0.00001

8.66

0.000001

Messghal

53.3

0.000121.5

0.00001

Milligram

Unit
Gram

GH-202Standard range
Capacity
Readability

Precision range
Capacity
Readability

220

0.000151

0.00001

220000

0.1

51000

0.01

Ounce (Avoir)

7.76

0.00001

1.80

0.000001

Troy Ounce

7.07

0.00001

1.64

0.000001

Metric Carat

1100

0.001

255

0.0001

Momme

58.7

0.000113.6

0.00001

Pennyweight

141.5

0.000132.8

0.00001

Grain (UK)

3395

0.002

787

0.0002

Tael (HK general, Singapore)

5.82

0.00001

1.35

0.000001

Tael (HK jewelry)

5.88

0.00001

1.36

0.000001

Tael (Taiwan)

5.87

0.00001

1.36

0.000001

Tael (China)

7.04

0.00001

1.63

0.000001

Tola (India)

18.86

0.00001

4.37

0.000001

Messghal

46.9

0.000110.9

0.00001

Milligram14

GH-300

GH-200Capacity

320

220

120

0.0001320000220000120000

0.1

Ounce (Avoir)

11.29

7.76

4.23

0.00001

Troy Ounce

10.29

7.07

3.86

0.00001

Metric Carat

1600

1100

600

0.001

Momme

85.3

58.7

32.0

0.0001

Pennyweight

205.8

141.5

77.2

0.0001

Grain (UK)

4938

3395

1852

0.002

Tael (HK general, Singapore)

8.47

5.82

3.17

0.00001

Tael (HK jewelry)

8.55

5.88

3.21

0.00001

Tael (Taiwan)

8.53

5.87

3.20

0.00001

Tael (China)

10.24

7.04

3.84

0.00001

Tola (India)

27.44

18.86

10.29

0.00001

Messghal

68.3

46.9

25.6

0.0001Unit
Gram
Milligram

15

GH-120

Readability

5-2. Changing the Units
The units or modes can be selected and stored in the function table. The sequence of displaying thesecan be arranged to fit the frequency of use. The units stored are maintained in non-volatile memory,even if the AC adapter is removed.
1.

Press and hold the RANGE key (for approx. 2 seconds) until
ba5fnc of the function table is displayed in the weighing mode,
Press and holdthen release the key.

2.

Press the RANGE key several times to display Unit .

3.

Press the PRINT key to enter the unit selection mode.

4.

Specify a unit or mode in the order to be displayed using thefollowing keys.

To unit

RANGE key.......... To display the units sequentially.
RE-ZERO key ...... To specify a unit or mode.

Examplesappears when the displayed unit

The stabilization indicatoror mode is specified.
ExamplesUnit

Displays the units
sequentially

DisplayGramgMilligram

mg

Counting mode

pcs

Percent mode%

Densitymoded5.

Press the PRINT key to store the units or modes. The balancedisplays end and then displays the next menu item of thefunction table.

6.

Press the CAL key to exit the function table. Then the balance
returns to the weighing mode with the selected unit.

16

5-2-1 Unit setting example
The example below sets the units in the order with g (gram) as the first unit followed by pcs (counting mode).

1.

Press and hold the RANGE key (for approx. 2 seconds) until
ba5fnc of the function table is displayed in the weighing mode,
then release the key.

2.

Press the RANGE key several times to display Unit .

3.

Press the PRINT key to enter the unit selection mode.

4.

Press the RE-ZERO key to specify the unit of g.
The stabilization indicatorappears when the unit isspecified.

5.

Press the RANGE key several times to display

6.

Press the RE-ZERO key to specify the unit of pcs.
The stabilization indicatorappears when the unit isspecified.

.

7.

Press the PRINT key to store the units.
The balance displays end and then displays the next menu
item of the function table.

8.

Press the CAL key to exit the function table. Then the balance
returns to the weighing mode with g, the unit selected first.

9.

Press the MODE key to switch between g and pcs (g→pcs).

17

Press and holdPressseveral times

SpecifyPressseveral times

SpecifyStore6. Weighing

Precautions for the weighing operation
Press the RE-ZERO key each time, before placing a sample on the weighing pan, to prevent possible
errors.
Place a sample in the center of the weighing pan gently.
Temperature changes during measurement may cause weighing error.
Shorten the operation time as much as possible. ( Opening and closing door, putting and removing
sample)Use a pair of tweezers to avoid a temperature change due to having your hand in the weighing chamber.
Material with an electrostatic charge or that is magnetic may cause a weighing error.
Do not press keys with a sharp instrument (such as a pencil or ball point pen).
Do not drop things on the pan, or place a weight on the pan that is beyond the weighing range of thebalance.
Calibrate your balance periodically to maintain weighing accuracy. Refer to section "8. Calibration".
Keep the area clean and dry.
Consider section "3. Precautions" for the weighing operation.
For precision weighing, keep the AC adapter connected to the balance.

6-1. Basic Operation (Gram Mode)
Read section "4. Display symbols and Key operation" before operation.
Note

When turning on the balance with a container placed on the pan, the tarefunction sets the display to zero automatically.

1.

Turn on the balance using the ON:OFF key.

2.

Select a preset unit (g or mg) using the MODE key.

3.

Place the container on the weighing pan, if necessary. Press the
RE-ZERO key to cancel the weight (tare). Then zero isdisplayed.
Container : A vessel placed on the pan, but not to be included in
the weighing data.

4.

Place a sample on the pan or in the container.

5.

Wait for the stabilization indicatorread the value.

6.

Remove the sample and container from the pan.

Container
Weighing pan
Stabilization
indicator
Sampleto be displayed, then18

Remove them

6-2. Dual Range
Weighing range
GH-252Available readability

GH-202

Precision range

0g

to

101 g

0g

to

51 g

Standard range

101 g

to

250 g

51 g

to

220 g

The GH-252 and GH-202 are equippedwith two ranges "precision range" and"standard range".

0.01 mg

Precision Range
Turn on the balance

When weighing is started by pressing the
ON:OFF key, the readability will be 0.1 mg.

0.1 mg1 mg

0.1 mg

1 mg

Standard Range
Turn on the balance

Readability

Readability

Readability

Readability

0.1mg

Pressing the RANGE key will switch theseranges alternately.

0.1mg

0.01mg

1mg

Readability

1mg

When a sample is weighed using the precision
range with a readability of 0.01 mg and the weightvalue exceeds the precision range value, thereadability changes to 0.1 mg of the standard range.
When removing the sample, the readability changes
to 0.01 mg of the precision range automatically.

Readability

0.01mgReadability

0.1mg

Readability

0.01mgWhen a tare weight (container mass value) exceeds
the precision range value, even if the sample iswithin the precision range value, 0.01 mg of the
precision range can not be selected for thereadability. In order to select 0.01 mg of the
precision range, remove the tare weight and press
the RE-ZERO key to cancel it.

When a readability of 0.1 mg or 1 mg is selected by the
RANGE key, the readability is maintained even if therange is changed during weighing.

19

Readability

0.01mgReadability

0.1mg

Zero display after
placing a container
Readability 0.1mg

Zero display after
removing the container
Readability 0.01mg

6-3. Counting Mode (PCS)This is the mode to determine the number of objects in a sample based on the standard sample unit mass.
The unit mass means an average mass of the samples. The smaller the variation in the samples, the moreaccurate the count will be. The balance is equipped with the Automatic Counting Accuracy Improvement(ACAI) function to improve the counting accuracy.
Note
Use samples with a unit mass of 1 mg or more for counting.
If the sample unit mass variable is too large, it may cause a counting error.
To improve the counting performance, use the ACAI function frequently or divide the samples into
several groups and count each group.

Selecting the counting mode
1. Press the MODE key to select the unit pcs (counting mode).

Storing a sample unit mass (Weighing input mode)2.

Press the RANGE key to enter the sample unit mass storing mode.

3.

To select the number of samples using the RANGE key.
It may be set to 10, 25, 50 or 100.

AdviseA greater number of samples will yield more accurate counting result.
4.

Place a container on the weighing pan, if nec essary. Press the
RE-ZERO key to cancel the weight (tare). The number specifiedin step 3 appears.
Example: 25 0 pcs is displayed if 25 is selected in step 3.

Weighing pan
Container
25 Samples

5.

Place the number of samples specified on the pan.
In this example, 25 pieces.

6.

Wait for the stabilization indicator to be displayed.
Press the PRINT key to calculate and store the unit mass. Then the balancedisplays 25 pcs and is set to count samples with this unit mass. (The sample
unit mass is stored in non-volatile memory, and is maintained even if the AC
adapter is removed.) To improve the accuracy of the unit mass, proceed to step 8.

Note
If the balance judges that the mass of the samples is too light (under 0.0001g) andcan not be stored as the unit mass, it displays lo .
If the balance judges that the mass of the samples is too light to acquire accurate weighing,Place
it displays an error requiring the addition of more samples to the specified number.
samples
Example: 50 - pcs appears, requiring 25 more samples. Add 25 samples and press the
PRINT key. When the unit mass is stored correctly, the balance proceedes to the counting
mode.

Counting operation
7.

Place the samples to be counted on the pan.

Counting result
20

Counting mode using the ACAI function
The ACAI is a function that improves the accuracy of the unit mass automatically by increasing the numberof samples as the counting process.
ACAI: Automatic Counting Accuracy Improvement

8.

9.

If a few more samples are added, the processing
indicator turns on. To prevent an error, add three or more.
The processing indicator does not turn on if overloaded.
Try to add the same number of samples as displayed.

The balance re-calculates the unit mass while theprocessing indicator is blinking. Do not touch the balanceor samples on the pan until the processing indicator turnsoff.

10. Counting accuracy is improved when the processing
indicator turns off. Each time the above operation is
performed, a more accurate unit mass will be obtained.
There is no definite upper limit to the ACAI range for thenumber of samples exceeding 100. Try to add the same
number of samples as displayed.

From step 7
Add a few more
samples.
The mark turns on at
proper range.
The mark turns on and off
during calculation.
The mark turns off after theunit mass is improved.

11. Remove all the samples used in ACAI and proceed withthe counting operation using the improved unit mass.

Note
ACAI will not function on the unit mass entered using the keys, or digital input mode.

21

Repeat6-4. Percent Mode (%)
The percent mode displays the weight value in percentage compared to a 100% reference mass and is used
for target weighing or checking the sample variance.

Selecting the percent mode1.

Press the MODE key to select the unit % (Percent mode). If thepercent mode can not be selected, refer to "5. Weighing Units".

Storing the 100% reference mass
2.

3.

4.

Press the RANGE key to enter the 100% reference mass storing
mode. Even in the storing mode, pressing the MODE key willswitch to the next mode.
Place a container on the weighing pan, if necessary. Press the
RE-ZERO key to cancel the weight (tare). The balance displays
100 0 %.

Pan

Container

Place the sample to be set as the 100% reference mass on the pan or in
the container.
100% mass

5.

Press the PRINT key to store the reference mass. The balancedisplays 100.00 %. (The decimal point position depends on thereference value. The reference mass is stored in non-volatile memory,and is maintained even if the AC adapter is removed.)

Note
Position of decimal point can be changed by 100% mass.
100% mass

Readability

0.0100g

to0.0999g

1%0.1000g

to0.9999g

0.1%

1.0000g

toweighing capacity

0.01%

If the balance judges that the mass of the sample is too light (under
0.01g) to be used as a reference, it displays lo .
A 100% reference mass can be stored in the non-volatile memory and ismaintained even if the AC adapter is removed.
6.

Place
sampleRemove the sample.

Reading the percentage
7.

Place a sample to be compared to the reference mass on sthe pan.
The displayed percentage is based on the 100% reference mass.
22

Percentage

7. Response Adjustment
This function stabilizes the weight value, reducing the influence on weighing that is caused by drafts and/or
vibration at the place where the balance is installed. This function adjusts by automatically analyzing theenvironment or by hand-operation. The function has three stages as follows :Response
indicator
Indicator
Parameter Response
Stability
FAST
MID.
SLOW

Cond 0Cond 1
Cond 2

Fast response,

Sensitive value

Slow response,

Stable value

7-1. Automatic Response Adjustment
This function automatically updates the response adjustment by analyzing the influence of the environment
using the internal mass.

1.

2.

Press and hold the MODE key (for approx. 2 seconds) until
RESPONSE is displayed, then release the key.

The balance automatically sets the response characteristic.
Caution3.

Press and hold

ReleaseDo not allow vibration or drafts to affect the balance
during adjustment.

After automatic adjustment, the balance displays end , returns to theweighing mode and displays the updated response indicator for about
thirty seconds.

ResultNote
If the automatic response adjustment fails, the balance displays CH ng . Check the ambient conditions
such as breeze and vibration, also check the weighing pan. Then, perform the adjustment again. To
return to the weighing mode, press the CAL key.
If there is matter on the weighing pan, the balance displays CH 0 . Remove them from the pan. To
return to the weighing mode, press the CAL key.

AdviseIf the automatic response adjustment is not helpful, try "7.2. Manual Response Adjustment".

23

7-2. Manual Response Adjustment
1. Press and hold the MODE key (for approx. 2 seconds) until
RESPONSE is displayed, then release the key.
Press the MODE key again quickly.

Press and hold

ReleasePress again
immediately

2. Select a stage of the response adjustment using the MODE
key. Either FAST , MID. or SLOW can be selected.

Select a parameter
Release and wait

3. The balance displays end , returns to the weighing modeand displays the updated response indicator for about thirty
seconds.

AdviseIf the automatic response adjustment is not helpful, specify a parameter for "Condition (Cond) " of"Environment, Display (ba5fnc)" with key operation.

24

8. Calibration
8-1. Calibration GroupCalibration
Automatic self calibration (Calibration due to changes in temperature)
Calibration using the internal mass (One-touch calibration)
Calibration using an external weight that you have

Calibration test
Calibration test using the internal mass
Calibration test using target mass that you have

Correction of the internal mass value
Correction of the internal mass value
Caution
Do not allow vibration or drafts to affect the balance during calibration.
Calibration test does not perform calibration.
To output the data for GLP/GMP using the RS-232C interface, set "GLP output (info)" of "Data output(dout)". Refer to "10. Function Table". Time and date can be added to GLP/GMP report. If the time ordate is not correct, adjust them. Refer to "10-7 Clock and Calendar Function".
Calibration test is available only when "GLP output (info)" of "Data output (dout)" is set .
The calibration and calibration test data can be stored in memory. To store them, set "Data memory(data)". Refer to "12. Data Memory" for details.

Caution on using an external weight
The accuracy of an external weight can influence the accuracy of weighing.
Select a mass for calibration and calibration test from the following table.
Model
Usable calibration mass
Adjustable range
GH-12050g,
100g*
GH-200100g,
200g*-15.0 mg to +15.9 mg
GH-300100g,
200g*,
300g
GH-202, GH-252
20g,
50g,
100g,
200g*
-15.00 mg to +15.99 mg
The calibration mass in bold type: factory setting
The calibration mass value can be adjusted within the range above.

DisplayThis indicator means "In process of measuring calibration data".
Do not allow vibration or drafts to affect the balance while the indicator is displayed.

About the internal mass
The internal mass may change due to corrosion or other damage caused by the operating environment,or due to aging. Check the internal mass periodically and correct the internal mass value if necessary.
25

8-2. Automatic Self Calibration
Automatic self calibration due to changes in temperatureThis function automatically calibrates the balance when the balance detects an ambient temperature change.
If GLP output is selected in the function table, the balance outputs the calibration report or stores the data inmemory. Automatic self calibration functions even if the display is turned off (standby state). Refer to "9-1.
Permit Or Inhibit" for the operation.
CautionWhen using automatic self calibration, do not place something on the weighing pan.
If something is on the weighing pan, the balance decides that it is in use and does not perform
automatic self calibration.
When weighing a light sample or installing the balance in a system, turn off automatic selfcalibration.
Note
When turning on the balance with nothing on the pan, if a sample heavier than 0.5 g is placed on thepan, the balance detects the state that a sample is placed on the pan and does not perform theautomatic self calibration.
The markis " prior notice indicator of automatic self calibration".

When the balance detects a change in ambient temperature, this indicator blinks
and automatic self calibration is required. If the balance is not used for several
minutes with this indicator blinking, the balance performs automatic self calibration.
The environment will affect the time that the indicator blinks.
The balance is measuring calibration data. Do not allow vibration or drafts to affectthe balance while this indicator is displayed. After calibration, the balance returns toindicate the previous display.

AdviseThe balance can be used while the indicator blinks. But, it is recommended that to maintain theaccuracy, stop using the balance and confirm that there is nothing on the pan and allow the balance toperform self calibration.

26

8-3. One-Touch Calibration
This function calibrates the balance using the internal mass. The only operation required is to press
the CAL key.
1.

Connect the AC adapter and warm up the balance for at least one hour withnothing on the weighing pan.

2.

Press the CAL key to display Cal in .

3.

The balance performs calibration using the internal mass.
Do not allow vibration or drafts to affect the balance.

4.

The balance displays end after calibration. If the GLP output is set, thebalance displays glp and outputs the calibration report using the RS-232C
interface or stores the data in memory. Refer to "GLP output (info)" and "Datamemory (data)" of the function table.

5.

The balance will automatically return to the weighing mode after calibration.

6.

Confirm weighing accuracy using calibration test (CC in).

27

GLP output

8-4. Calibration Test Using the Internal Mass
This function tests the balance accuracy using the internal mass. (Balance is not calibrated) When the GLP
output is set, the calibration test report is output or stored.

1. Connect the AC adapter and warm up the balance at least one hour.

2. Press and hold the CAL key (for approx. 2 seconds) until CC in isdisplayed, then release the key.

Release3. The balance measures the zero point. Prevent vibration anddrafts to affect the balance.

4. The measured zero point data is displayed.

5. The balance measures the full scale data. Prevent vibrationand drafts to affect the balance.

6. The full scale data is displayed. The tolerance of the full scaledata is ±0.2mg.
Model
Full scale data
GH-120100.000 g
GH-200, GH-300,
200.000 g
GH-202, GH-252

7. When the GLP output is set, the calibration test report is
output or stored.
Refer to "GLP output (info)" and "Data memory (data)"of the function table.
The zero point data and full scale data is displayed (oroutput) in unit of 0.0001g.

8. The balance automatically returns to the weighing mode.

28

Press and hold

GLP output

8-5. Calibration Using an External WeightThis function calibrates the balance using an external weight.
1. Connect the AC adapter and warm up the balance for at least one
hour with nothing on the weighing pan.

Press
and
hold

2. Press and hold the CAL key (for approx. 2 seconds) until
Calout is displayed, then release the key.

Release3. The balance displays Cal 0 .
If you want to change the calibration mass, press the RANGE
key and proceed to step 4.
If you use the calibration mass value stored in the balance,
proceed to step 5.

Select4. Specify the calibration mass value as follows:
RANGE key

The key to switch blinking figures.

RE-ZERO (+)key
MODE (-)key

The keys to select the calibration mass or adjust
the mass value. Refer to page 23.

PRINT key

The key to store the new mass value. Even if theAC adapter is removed, the data is maintained in
non-volatile memory.

CAL key

The key to cancel the operation and return to
Cal 0 .

5. Confirm that there is nothing on the pan and press the PRINT key. Thebalance measures the zero point. Do not allow vibration or drafts to affectthe balance.The balance displays the calibration mass value.

Specify

Example:New weight100.0012 g

6. Place the displayed calibration weight on the pan and press the PRINT
key. The balance measures the calibration mass. Do not allow vibration
or drafts to affect the balance.
Place weight
7. The balance displays end . Remove the weight from the pan.
8. If the "GLP output (info)" the function table is set, the balance displays
glp and outputs or stores "Calibration Report". Refer to "11-2. GLP
Report" for details.
9. The balance will automatically return to the weighing mode.
10. Place the calibration weight on the pan and confirm that the value
displayed is correct. If it is not within the range, check the ambientconditions such as breeze and vibration also check the weighing pan.
Then, repeat steps 1 to 10.
29

RemoveGLP output

8-6. Calibration Test Using an External WeightThis function tests the weighing accuracy using an external weight. Calibration
test report can be output or stored with "GLP output (info)" (Calibration test does
not perform calibration).
1.

Connect the AC adapter and warm up the balance for at least one
hour with nothing on the weighing pan.

2.

Press and hold the CAL key (for approx. 2 seconds) until CC out
is displayed, then release the key.

3.

The balance displays CC 0 .
If the target mass is changed, press the RANGE key and proceed
to step 4. A list of usable weights is on page 23.

Press
and hold
Release

SelectIf current target mass value is used, proceed to step 5.
4. Specify the target mass value as follows:
RANGE key ................The key to switch blinking figures.

Specify

RE-ZERO (+)key ..........The keys to select the target mass or adjust
the mass value. Refer to page 23.
MODE (-)key

PRINT key ..................The key to store the new mass value. Even if

the AC adapter is removed, the data ismaintained in non-volatile memory.
CAL key ......................The key to cancel the operation and return to
CC 0 .
5. Confirm that there is nothing on the pan and press the PRINT key. Thebalance measures the zero point and displays the measured value. Do notallow vibration or drafts to affect the balance. The balance displays thetarget mass value.

6. Place the displayed target mass on the pan and press the
PRINT key. The balance measures the target mass and displays themeasured value. Do not allow vibration or drafts to affect the balance.

7.

Example:New weight100.0012 g

Place weight

The balance displays end . Remove the weight from the pan.
Remove8. The balance displays glp and outputs or stores "calibration test report.
Refer to "11.2. GLP Report" of the function table for details.
GLP output
9. The balance will automatically return to the weighing mode.
30

8-7.Correcting the Internal Mass Value
The balance can correct the internal mass value within the range shown below. This function corrects theinternal mass value to conform to an external weight. The corrected mass value is maintained in non-volatilememory even if the AC adapter is removed. The internal mass value is corrected as follows:
Model
TargetRange
The same mass
200g
200g
GH-120100.000 g
Correct the internal mass by
GH-200+0.6mg. Calibrate with this±1.5 mg
GH-300200.0006g
200.000 g
internal mass.
200.0000 g
GH-202
Corrected external weight
GH-252
1. Calibrate the balance using the internal mass. (one-touch calibration)
Example: 200.0000 g is corrected to +0.6 mg (200.0006 g). When correcting a 100 g external
weight by +0.6 mg, the weight changed into 200 g, the correction value is +1.2 mg.
2. Press the ON:OFF key to turn off the display.
3. While pressing and holding the PRINT key and the RANGE key, press the Press and hold
ON:OFF key. The balance displays p5 .
4. Press the PRINT key. Then the balance displays the function switches. Set thefunction table switch and internal mass correction switch to "1" as shown above
using the following keys.
RANGE key
The key to select blinking figure.
RE-ZERO key
The key to change the value of the blinking figure..
PRINT key
The key to store it and return to weighing mode.
CAL key
The key to cancel current operation.
Weighing mode
Function table switch
Correction switch of internal mass
5. Press and hold the RANGE key (for approx. 2 seconds) to enter thefunction table and release the key when ba5fnc is displayed.
6. Press the RANGE key several times until C5 in is displayed, then release
the key.
7. Press PRINT key. Correct the internal mass value using the following keys.
RE-ZERO (+)key The key to select the value.
MODE (-)key
The key to select the value.
PRINT key
The key to store the new value and display the next menu
item of the function table.
CAL key
The key to cancel this correction and display the next menu
item of the function table.
8. Press the CAL key to return the weighing mode.
9. Press the CAL key to calibrate the balance using the internal mass.
10. Check the correction that has been performed properly with the external weight.
If the value is incorrect, repeat the correction.
31

Press and holdPress

9. Function Switch and Initialization
9-1. Permit or Inhibit
The balance stores parameters that must not be changed unintentionally (Example: Calibration data for
accurate weighing, Data for adapting to the operating environment, Control data for the RS-232C interface).
There are five switches for the purpose of protecting parameters. Each switch can select either "permit" or"inhibit". "Inhibit" protects parameters against unintentional operations.

1.

Press the ON:OFF key to turn off the display.

2.

While pressing and holding the PRINT key and the RANGE key, press the ON:OFF key todisplay p5 .

3.

Press the PRINT key. Then the balance displays the function switches.

4.

Specify the switches using the following keys.
RANGE key..............The key to select blinking digit.

RE-ZERO key ..........The key to change the parameter for the selected switch.

0

To inhibit changes. (Can not be used.)1
To permit changes. (Can be used.)................
PRINT key
The key to store the new parameter and return to the weighing mode.
....................
CAL key
The key to cancel current operation and return to the weighing mode.

Function table
0

To inhibit changes to the function table.

1

To permit changes to the function table.

Calibration using the internal mass (One-touch calibration)0

To inhibit calibration using the internal mass.

1

To permit calibration using the internal mass.

Calibration using the external weight0

To inhibit calibration using the external weight.

1

To permit calibration using the external weight.

Automatic self calibration (due to changes of ambient temperature)0

To inhibit automatic self calibration.

1

To permit automatic self calibration.

Internal mass correction
0

To inhibit correction.

1

To permit correction.

32

9-2. Initializing the BalanceThis function returns the following parameters to factory settings.
Calibration data
Function table
The sample unit mass value (counting mode),
100% reference mass value (percent mode)
The data that is stored in the balance using the data memory function
External calibration weight and target mass value
Function switch settings ("9.1. Permit Or Inhibit")
Liquid density and temperature in the density modeNote
Be sure to calibrate the balance after initialization.

1. Press the ON:OFF key to turn off the display.

2. While pressing and holding the PRINT key and the RANGE key,press the ON:OFF key to display p5 .

3.

Press the RANGE key to display Clr .

4.

Press the PRINT key.
To cancel this operation, press the CAL key.

5.

Press the RE-ZERO key to display Clr go .

6.

PRINT
key to initialize the balance. The balance
Press thewill automatically return to the weighing mode.

33

Press and hold Press10. Function Table
The function table reads or rewrites the parameters that are stored in the balance. These parameters aremaintained in non-volatile memory, even if the AC adapter is removed.
The function table menu consists of two layers. The first layer is the "Class" and the second layer is the "Item".

10-1. Setting the Function Table
Display symbol and keys
The symbol "〇" shows effective parameter.
When pressing and holding the key in the weighing mode, the mode enters the function
table mode.
The key to select the class or item in the function table mode.
The key to change the parameter.
When displaying a class, the key enters an item in the class.
When displaying an item, the key stores the new parameter and displays the next class.
When displaying an item, the key cancels the new parameter and displays the next class.
When displaying a class, the key exits the function table mode and returns to the weighing
mode.

Setting procedure1.

Press and hold the RANGE key (for approx. 2 seconds) until
displayed in the weighing mode, then release the key

ba5fnc of the function table is2.

Press the RANGE key to select a class.

3.

Press the PRINT key to enter the class4.

Press the RANGE key to select a item.

5.

Press the RE-ZERO key to select a parameter for the selected item.

6.

If storing parameters of the selected class, press the PRINT key. Then the next class is displayed. Ifcanceling the current operation, press the CAL key. Then the next class is displayed.

7.

When specifying parameters for another class, proceed to step 2.
When finishing the setting, press the CAL key to return to weighing mode.

34

Setting example
This example sets "Stores weighing data" for "Data memory" and "1 minute" for "Interval time".

Weighing mode
Start

Item
"Data memory"

Step 1Press and
hold

Class

Step 4Press several
times

Step 2Press several
times
Step 3

Step 6Item

Step 8

Step 5

Parameter"Stores weighing data"

Step 4Item"Interval time"

FinishWeighing mode

35

Step 5

Parameter"1 minute"

Step 7

10-2. Details of the Function Table
Class

Item and Parameter
Cond
Condition
5t-b
Stability band widthba5fncEnvironment
Display

Cl adjClockDescription0120Slow response, stable value
Stable range is ±1 digit

1

5pd

0

Display refresh rate

1

pnt

0

Decimal point

1

p-on

0

Stable range is ±3 digits
OFF
NormalStrongVery strong
5 times/second
10 times/second
Point (.)
Comma (,)
OFF

Auto display-ON

1

ON

2
0

trc

1

Zero tracking

2
3

The stabilization indicator#1 illuminates when the display
fluctuation is within the range.

ap-pAuto print polarity
ap-b
Auto print differencedata
Data memory

Period to refresh the display
Decimal point format
Turns on the weighing mode
display when the AC adapter isconnected.
The time and date are added tothe output data.
Accepts the PRINT key only
when the display is stable.

Auto print mode A(Reference = zero)
Auto print mode B(Reference = last stable value)

Outputs data when the display isstable and conditions of ap-p,
ap-b and the reference value
are met.

3

Stream mode /Interval memory mode

With data 0, outputs data
continuously; with data 2, uses
interval memory.

0

Plus only

Displayed value>Reference

prt

dout

Keeps zero display by tracking
zero drift.

Key mode1
Data output mode

Can be changed by response

MID. adjustment.
SLOW

Refer to "10.7. Clock and Calendar Function"0

Data output

Fast response, sensitive value FAST

2

Minus only
2 Both0 10 digits
1 100 digits
2 1000 digits
0 Not used
1 Stores weighing data
2 Stores calibration data
: Factory settings.
1

Displayed value<Reference
Regardless of displayed value
Difference between reference
value and displayed value #2
Related items:
prt, int, d-no, 5-td, info

#1 The unit of readability is digit.
Example: If 1 mg display is selected using the RANGE key for the GH-300, 1 mg is one digit.
#2 Usable readability of the balance is one digit.
Example: In gram display, one digit is 0.01 mg for the GH-252 and 0.1 mg for the GH-300.
36

ClassItem and Parameter

intInterval timed-no
Data number output
dout
Data output

5-td
Time/Date output
5-id
ID number output
pU5e
Data output pause
at-fAuto feedinfo
GLP output
ar-d
Zero after output

bp5
Baud rate

5if
Serialinterface

btpr
Data bit, parity bit
Crlf
Terminator

type
Data format

Description
0 Every measurement
1 2 seconds
2 5 seconds
3 10 seconds
4 30 seconds
5 1 minute6 2 minute7 5 minute
8 10 minute
0 No output
1 Output
0 No output
1 Time only
2 Date only
3 Time and date
0 No output
1 Output
0 No pause
1 Pause (1.6 seconds)
0 Not used
1 Used0 No output
1 AD-8121 format
2 General data format
0 Not used
1 Used0 600 bps
1 1200 bps
2 2400 bps
3 4800 bps
4 9600 bps
5 19200 bps
0 7 bits, even1 7 bits, odd
2 8 bits, none
0 CR LF
1 CR
0 A&D standard format
1 DP format
2 KF format
3 MT format
4 NU format
5 CSV format: Factory settings.

Interval time in the interval
memory mode when using
prt 3, data 1

Refer to "12. Data Memory"
Selects whether or not the timeor date is added to the weighting
data. Refer to "10.7. Clock andCalendar Function" for details.
Selects whether or not the ID
number is output.
Selects the data output interval.
Selects whether or not automatic
feed is performed.
Selects GLP output method.
Refer to "11. ID Number And
GLP Report" for details.
Adjusts zero automatically after
data is output

CR: ASCII code 0Dh
LF: ASCII code 0Ah

Refer to "10.5. Description of
Item Data Format".

CautionThe balance may not transmit the data completely at the specified refresh rate, depending on the baud rate or data added
to the weighing data such as time, date and ID number.
37

ClassItem and Parameter

Description

t-Up

0

No limit

Timeout

1

1 second

erCd

0No output

AK, Error code1

OutputCt5

0

Not used

CTS, RTS control

1

Used

d5 fncldin

0Water temperatureDensity function

Liquid density input

1

Liquid density

5if
Serialinterface

Unit
Unit
C5 in
Internal mass correction
id
ID number setting

Selects the wait time to receive acommand.
AK: ASCII code 06h

Controls CTS and RTS.
Available only when density
mode is selected

Refer to "5. Weighing Units".
Displayed only when the internal mass value correction switch is set
to 1. Refer to "8. Calibration".
Refer to "11. ID Number And GLP Report".
: Factory settings. Digit is a unit of readability.

CautionThe balance may not transmit the data completely at the specified refresh rate, depending on the baud rate or data
added to the weighing data such as time, date and ID number.

38

10-3. Description of the Class "Environment, Display"
Condition ( Cond )Cond 0This parameter is for sensitive response to the fluctuation of a mass value. Used for powder
target mass, weighing a very light sample or when quick response weighing is required. Aftersetting, the balance displays FAST .

Cond 2This parameter is for stable weighing with slow response. Used to prevent a mass value fromdrifting due to vibration or drafts. After setting, the balance displays SLOW .

Note
In automatic response adjustment, this parameter is selected automatically.

Stability band width ( 5t-b )This item controls the width to regard a mass value as a stable value. When the fluctuation per second isless than the parameter, the balance displays the stabilization indicator and outputs or stores the data.
The parameter influences the "Auto print mode"
5t-b 0This parameter is used for sensitive response of the stabilization indicator. Used for exact
weighing.

5t-b 2This parameter ignores slight fluctuations of a mass value. Used to prevent a mass value fromdrifting due to vibration or drafts.

Zero tracking ( trc )This function tracks zero point drift caused by changes in the environment and stabilizes the zero point.
When the weighing data is only a few digits, turn the function off for accurate weighing.
trc 0

The tracking function is not used. Used for weighing a very light sample.

trc 1

The normal tracking function is used.

trc 2

The strong tracking function is used.

trc 3

The very strong tracking function is used. Used for stable zero display.

Display refresh rate ( 5pd )The period to refresh the display. This parameter influences "Baud rate", "Data output pause" and the data
output rate of "Stream mode".

Decimal point ( pnt )The decimal point format can be selected.

Auto display-ON ( p-on )When the AC adapter is plugged in, the display is automatically turned on without the ON:OFF key
operation, to display the weighing mode. Used when the balance is built into an automated system.
one hour warm up is necessary for accurate weighing.

39

10-4. Description of the Item "Data Output Mode"
The parameter setting of "Data output mode (prt)" applies to the performance when the "Data memory(data)" parameter is set to "2" (to store the weighing data) and when the data is transmitted using the
RS-232C interface.

Key mode
When the PRINT key is pressed with the stabilization indictor turned on, the balance outputs orstores the weighing data and the display blinks one time.
Required setting dout

prt 0

Key mode

Auto print modes A and B
When the displayed value is stable and the conditions of "Auto print polarity", "Auto print difference" andreference value are met, the balance outputs or stores the weighing data.
When the PRINT key is pressed with the stabilization indictor turned on, the balance outputs or storesthe data and the display blinks one time.
Auto print modes A
ExampleFor weighing each time a sample is placed and removed, with "ar-d" set to "1"(to adjust zero after the data is output).

Required setting

dout

prt 1

Auto print mode A (reference = zero)

dout

ap-p

Auto print polarity

dout

ap-b

Auto print difference

dout

ar-d 1

Zero after output

Auto print modes B
ExampleFor weighing while a sample is added.

Required setting

dout

prt 2

Auto print mode B (reference = last stable value)

dout

ap-p

Auto print polarity

dout

ap-b

Auto print difference

Stream mode
The balance outputs the weighing data continuously regardless of the display condition. When thedisplay refresh rate is set to 5 times / second (5pd 0), the data output rate is also set to the same 5times/second. The display does not blink in this mode. The interval memory mode is used when the"Data memory (data)" parameter is set to "1" (to store the weighing data).
ExampleFor monitoring data on a computer.

Required setting

dout

prt 3

Stream mode

dout

data 0

Data memory function is not used

ba5fnc 5pd

Display refresh rate

5if

Baud ratebp5

CautionThe balance may not transmit the data completely at the specified refresh rate, depending on the baudrate or data added to the weighing data such as time, date and ID number.
40

Interval memory mode
The weighing data is periodically stored in memory.
ExampleFor periodical weighing without a personal computer command and to output allof the data, to a computer, at one time. The GH series can use time and datewith "Time/Date output (5-td)".

Required setting

dout

prt 3

Interval memory mode

dout

data 2

Data memory function is used

dout

int

Interval time

dout

5-td1, 2, or 3

Adds the time and date.

Optional setting

41

10-5. Description of the Item "Data Format"
A&D standard format

5if type 0This format is used when the peripheral equipment can receive the A&D format. If an AD-8121B is used, set
the printer to MODE 1 or 2. With an AD-8127 printer, use the external key printing mode, manual printing
mode, auto printing mode or interval printing mode.
This format consists of fifteen or sixteen characters excluding the terminator. When numericalcharacters without decimal point are exceeded eight characters for the GH-252, the format becomes
sixteen characters.
A header of two characters indicates the balance condition.
The polarity sign is placed before the data with the leading zeros. If the data is zero, the plus sign isapplied.
The unit, consisting of three characters, follows the data.
S T , +

0

Header

0 0

. 1 2

7

Data

Unit

S T Stable header
U S Unstable header
O L Overload header
S T , +

g CR LF

81

0 0

HeaderStable header of counting mode

Q T

. 0 1

2

g CR LF

7 8

Data

DP (Dump print) format

Terminator

Unit

Terminator

5if type 1

This format is used when the peripheral equipment can not receive the A&D format. If an AD-8121B is used,
set the printer to MODE 3. With an AD-8126 printer, use this format. With an AD-8127 printer, use thedump printing mode.
This format consists of sixteen characters excluding the terminator.
A header of two characters indicates the balance condition. No overload header is used.
The polarity sign is placed before the data, with spaces in place of leading zeros, if the data is not zeroor overloaded.
The unit, consisting of three characters, follows the data.
W TT+

Header

W T
U S

0 .

1 2

g CR LF

7 8

Data

Stable header
Unstable header

Unit

Terminator

Stable header of counting mode

Q T

42

KF format

5if type 2

This is the Karl-Fischer moisture meter format and is used when the peripheral equipment can only
communicate using this format.
This format consists of fourteen characters excluding the terminator.
This format has no header characters.
The polarity sign is placed before the data, with spaces in place of leading zeros, if the data is not zeroor overloaded.
This format outputs the unit only for a stable value.
+

0 .

1 2

7 8

CR LF

g

Data

Unit

g

MT format

Terminator
Stable value
Unstable value

5if type 3

A header of two characters indicates the balance condition.
The polarity sign is used only for negative data.
The weighing data uses spaces in place of the leading zeros.
The character length of this format changes dependent upon the unit
S

0 . 1
Header

2 7

8

Data

g CR LF
Unit

Terminator

Stable headerS
S D Unstable header
S I Overload header

NU (numerical) format

5if type 4

This format outputs only numerical data.
This format consists of ten characters excluding the terminator.
The polarity sign is placed before the data with the leading zeros. If the data is zero, the plus sign is
used.
+ 0

0 0

0 .

Data

1 2

7 8 CR LF
Terminator

43

CSV format

5if type 5

This format separates the data of A&D standard format and the unit by a comma ( , ).
This format outputs the unit even when the data is overloaded.
When a comma ( , ) is selected for the decimal point, the separators are set to semicolon ( ; ).
When the ID number, data number, time and date are added at "Data output (dout)" of the function
table, outputs ID number, data number, date, time and weighing data in this order and separates each
item by a comma and treats all the items as one group of data.

LAB-0123, No,012, 2004/07/01, 12:34:56, ST,+0000.1278,~~ g<CR><LF>
ID number

S

Data number

T , + 0O L , +

ID number

0

9

Date

0 . 1

9 9

9 9

2 7

Time

Weighing data

g CR LF

8 ,9 9 E + 1 9,

g CR LF

dout 5-id 1

The number to identify a specific balance.
This format consists of eight characters excluding the terminator.
L A B

- 0

Data number

1

2 3 CR LF

dout d-no 1

This format outputs the data number just before the data is transmitted using the RS-232C interface.
This format consists of six characters excluding the terminator.
When CSV format (5if type 5) is selected, the period ( . ) is replaced with a comma ( , ).
Data number

DateTerminator

dout 5-td 2 or 3

The date output order can be changed in " Time/Date output (5-td)" and "Clock (Cl adj)". The year is
output in a four-digit format.
2

0 0

Time

4 / 0

7 /

0 1 CR LF

dout 5-td 1 or 3

This format outputs time in 24-hour format.
1 2

:

3 4

:

5 6 CR LF

44

10-6. Data Format Examples
Stableg CR LF
A&D S T , + 0 0 0 . 1 2 7 8
g CR LF+ 0 . 1 2 7 8
DP W TCg
0 . 1 2 7 8
KF +
R LF
0 . 1 2 7 8
g CR LF
MT S
NU + 0 0 0 0 . 1 2 7 8 CR LF

Unstable

A&D U
DP U
KF
MT S
NU -

Overload
Positive error

Overload
Negative error

S ,
S

-

0 1
1 8 .
D
- 1
0 0 1 8 .

8 . 3 6 9 0
g CR LF
1 8 . 3 6 9 0
g CR LF
C
L
3 6 9 0R F
g CR LF
8 . 3 6 9 0
3 6 9 0 CR LF

A&D O L , + 9 9 9 9 9 9 9 E + 1 9 CR LF
CR LF
E
DP
C
L
H
KF
R F
MT S I + CR LF
NU + 9 9 9 9 9 9 9 9 9 CR LF
A&D O L , - 9 9 9 9 9 9 9 E + 1 9 CR LF
CR LF
- E
DP
CR LF
L
KF
C
L
MT S I - R F- 9 9 9 9 9 9 9 9 9 CR LF
NUSpace, ASCII 20h
Carriage Return, ASCII 0Dh
Line Feed, ASCII 0Ah

45

Units
A&D

D.P.

KF

g

g

mg

m g

Counting mode

MT

g

g

m g

m g

m g

P C

P C

p c

Precent mode%%

Ounce (Avoir)

o z

o z

g

Troy Ounce
Metric Carat
Momme
Pennyweight

s

P C S

%

%

o z

o z

o z

t

o z

t

o z

c

t

c

t

c

t

t

o z
c

t

m o m

m o m

m o m

m o

d w

d w

t

d w

d w

t

t

Grain

G N

G N

g r

Tael (HK general, Singapore)

t

l

t

l

t

l

s

t

l

Tael (HK, jewelry)

t

l

t

l

t

l

h

t

l

Tael (Taiwan)

t

l

t

l

t

l

t

t

l

Tael (China)

t

l

t

l

t

l

c

t

l

t

t

o

l

t

s

M S

m

D S

D S

D S

t

Tola (India)
m e

Messghal

s

m e

D S

DensitySpace, ASCII 20h

46

t

G N

t

10-7. Clock and Calendar Function
The balance is equipped with a clock and calendar function. When the "GLP output (info)" parameter is set
to "1" or "2" and the "Time/Date output (5-td)" parameter is set to "1", "2" or "3", the time and date are added
to the output data. Set or confirm the time and date as follows:

Operation
1.

Press and hold the RANGE key (for approx. 2 seconds) until
displayed in the weighing mode, then release the key.

2.

Press the RANGE key several times to display Cl adj .

3.

Press the PRINT key.
The balance enters the mode to confirm or set the time and date.

ba5fnc of the function table isConfirming the time
4.

The current time is displayed with all the digits blinking.
When the time is correct and the date does not need to be confirmed,
press the CAL key and proceed to step 8.
When the time is correct and the date is to be confirmed, press the
RANGE key and proceed to step 6.
When the time is not correct and is to be changed, press the
RE-ZERO key and proceed to step 5.

Setting the time5.

Set the time in 24-hour format using the following keys.
RANGE key ....... The key to select the digits to change the value.
The selected digits blink.
...
RE-ZERO (-)key The key to increase the value by one.
MODE (+)key ....... The key to decrease the value by one.
PRINT key.......... The key to store the new setting, display

end and proceed to step 6.

CAL key.............. The key to cancel the new setting and proceed to step 6.

Confirming the date
6.

Store

Proceed to dateconfirming mode

Confirm the date orchange the display order

The current date is displayed with all the digits blinking.
To change the display order of year (y), month (m) and day (d),press the MODE key. The date is output in the order as
specified.
When the date is correct and the operation is to be finished, press the
CAL key and proceed to step 8.
When the time is to be confirmed again, press the RANGE key andproceed back to step 4.

Proceed to datesetting mode

When the date is not correct and is to be changed, press the
RE-ZERO key and proceed to step 7.
Note
The year is expressed using a two-digit format. For example: The year 2004 is expressed as "04".

47

Setting the date7.

Set the date using the following keys.
RANGE key......... The key to select the digits to change the value.

Set the date

The selected digits blink.
RE-ZERO key ...... The key to increase the value by one.
MODE key............ The key to decrease the value by one.
PRINT key............ The key to store the new setting, display
end and proceed to step 8.

Store

CAL key................ The key to cancel the new setting and proceed to step 8.

Quitting the operation
8.

The balance displays the next menu item of the function table. Press the CAL key to exit the clock
and calendar function and return to the weighing mode.

Note
Do not enter invalid values such as a non-existing date when setting the time and date. When the clock
backup battery has been depleted, the balance displays rtc pf . Under this condition, press any key
and set the time and date. The dead battery only affects the clock and calendar function. Even so, thefunction works normally as long as the AC adapter is connected to the balance.

48

11. ID Number and GLP Report
The ID number is used to identify the balance when Good Laboratory Practice (GLP) or Good
Manufacturing Practice (GMP) is used.
The output format for GLP/GMP compliant report is selected in "GLP output (info)" of the function
table and can be output to a personal computer or printer using the RS-232C serial interface.
The GLP/GMP compliant report includes the balance manufacturer, model, serial number, ID
number, date, time and space for signature. The calibration report and the calibration test report
include the weight used and the result.
The balance can output the following reports for GLP / GMP using the RS-232C serial interface.
"Calibration report" of the calibration, using the internal mass (Calibration due to changes intemperature and one-touch calibration.)"Calibration report" of the calibration, using an external weight.
"Calibration test report" of the calibration test, using an external weight.
"Title block" and "End block" for the weighing data.
Calibration and calibration test data can be stored in memory to output several reports at the same time.
Refer to "12. Data Memory" for details.
For details on confirming and setting the time and date for the GH series. Refer to "10-7. Clock andCalendar Function". To output the GLP/GMP compliant report, set the AD-8127 printer to the dump
printing mode.

11-1. Setting the ID Number
1. Press and hold the RANGE key (for approx. 2 seconds) until
displayed, then release the key.

2. Press the RANGE key several times to display

ba5fncof the function table isid .

3. Press the PRINT key. Set the ID number using the following keys.
RE-ZERO key .... The key to set the character of the digit selected.

Refer to the display character set shown below.
RANGE key ....... The key to select the digit to change the value.
PRINT key.......... The key to store the new ID number and display ba5fnc .
CAL key.............. The key to cancel the new ID number and display ba5fnc .

4. With ba5fnc displayed, press the CAL key to return to the weighing mode.

49

11-2. GLP Report
To output the GLP/GMP compliant report to an AD-8121B printer, AD-8127 printer or to a personal
computer, set the "GLP output (info)" parameter of the function table to "1" (AD-8121 format) or "2"(General format using the balance built-in clock data).

Notes on outputting the GLP/GMP compliant report to a printer
Refer to "15-2. Connection to Peripheral Equipment" for connection to a printer.
With an AD-8121B printer, use MODE 3. If MODE1 is used, select temporarily the dump print
mode by pressing the STAT. key of the AD-8121B printer.
With an AD-8127 printer, use the dump printing mode.
If the external key printing mode is used, press and hold the ENT key of the AD-8127 printer (forapprox. 2 seconds) to switch between the external key printing mode and the dump printing mode.
If the time and date are not correct when the balance built-in clock data is output (info 1, 2), set thecorrect time and date in "Clock (Cl adj)" of the function table.

Calibration report using the internal mass
Key operation
1.

Press the CAL key to display Cal in and calibrate the balance automatically.

2.

If GLP output is used, glp is displayed and the calibration report is output.

3.

The balance returns to weighing mode after this calibration.
Setting of "info 1"

Setting of "info 2"

AD-8121 printer format

General format===========A=&=D
MODEL=====GH-300
S/N=====01234567
ID======LAB-0123
DATE==2004/07/01
TIME====12:34:56
CALIBRATED(INT.)

Manufacturer
Model
Serial number
ID number
Date
Time
Calibration type

SIGNATURE

Signature---------------Space, ASCII 20h<TERM>

Terminator, CR , LF or CR

CR

Carriage return, ASCII 0Dh

LFLine feed, ASCII 0Ah
50

Calibration test report using an internal mass
Note
Calibration test does not perform calibration.
Key operation
1.

Press and hold the CAL key (for approx. 2 seconds) to display CC in and release the key.

2.

CC

3.

The zero point is measured and the weight value is displayed for a few seconds.

4.

Internal mass is weighed and the weight value is displayed for a few seconds.

5.

If GLP output is used, glp is displayed and the calibration test report is output.

6.

The balance returns to weighing mode after this test.

is displayed and the balance is tested automatically.

CommandThis calibration test report can be performed with command TST.
Setting of "info 1"

Setting of "info 2"

AD-8121 printer format

General format-----------A-&-D
MODEL-----GH-300
S/N-----01234567
ID------LAB-0123
DATE--2004/07/01
TIME----12:34:56
CAL.TEST(INT.)ACTUAL-------0.0000--g----+200.0002--g
TARGET----+200.0000--g

Manufacturer
Model
Serial number
ID number
Date
Time
Calibration test type
Zero point value
Target weight value

SIGNATURE

Target weight
Signature---------------Space, ASCII 20h<TERM>

Terminator, CR , LF or CR

CR

Carriage return, ASCII 0Dh

LFLine feed, ASCII 0Ah

51

Calibration report using an external weight
Key operation
1.

Press and hold the CAL key (for approx. 2 seconds) to display Cal out and release the key.

2.

Cal 0 is displayed.

3.

When updating the calibration mass value, press the RANGE key and proceed to step 4. When usingpreset calibration mass value, proceed to step 5.

4.

Specify calibration mass value using the following keys.
RANGE key ........... The key to select the blinking figure
RE-ZERO (+)key ..... The key to increase the value of the blinking figure.
MODE (-)key............ The key to decrease the value of the blinking figure.
PRINT key ............. The key to store the new value.

5.

When pressing the RE-ZERO key, the zero point is measured and the weight value is displayed for a
few seconds.

6.

Place the displayed mass on the pan. Press the PRINT key to measure the mass and the weightvalue is displayed for a few seconds.

7.

If GLP output is used, glp is displayed and the calibration report is output.

8.

The balance returns to weighing mode after this calibration.

Setting of "info 1"

Setting of "info 2"

AD-8121 printer format

General format-----------A-&-D
MODEL-----GH-300
S/N-----01234567
ID------LAB-0123
DATE--2004/07/01
TIME----12:34:56
CALIBRATED(EXT.)
CAL.WEIGHT----+200.0000--g
SIGNATURE

Manufacturer
Model
Serial number
ID number
Date
Time
Calibration type
Calibration weight
Signature---------------Space, ASCII 20h<TERM>

Terminator, CR , LF or CR

CR

Carriage return, ASCII 0Dh

LFLine feed, ASCII 0Ah
52

Calibration test report using an external weight
Note
Calibration test does not perform calibration.
Key operation
1.

Press and hold the CAL key (for approx. 2 seconds) to display CC out and release the key.

2.

Cal 0 is displayed.

3.

When updating the target value, press the RANGE key and proceed to step 4.
When using preset target value, proceed to step 5.

4.

Specify calibration mass value using the following keys.
RANGE key ...........The key to select the blinking figure
RE-ZERO (+)key .....The key to increase the value of the blinking figure.
MODE (-)key............The key to decrease the value of the blinking figure.
PRINT key .............The key to store the new value.

5.

When pressing the RE-ZERO key, the zero point is measured and the weight value is displayed for a
few seconds.

6.

Place the displayed mass on the pan. Press the PRINT key to measure the mass and the weightvalue is displayed for a few seconds.

7.

If GLP output is used, glp is displayed and the calibration test report is output.

8.

The balance returns to weighing mode after this test.
Setting of "info 1"

Setting of "info 2"

AD-8121 printer format

General format-----------A-&-D
MODEL-----GH-300
S/N-----01234567
ID------LAB-0123
DATE--2004/07/01
TIME----12:34:56
CAL.TEST(EXT.)ACTUAL-------0.0000--g----+200.0002--g
TARGET

Manufacturer
Model
Serial number
ID number
Date
Time
Calibration test type
Zero point value
Target weight value----+200.0000--g
SIGNATURE

Target weight
Signature---------Space, ASCII 20h<TERM>

Terminator, CR , LF or CR

CR

Carriage return, ASCII 0Dh

LFLine feed, ASCII 0Ah
53

Title block and end block
When mass values are recorded as GLP data, a "Title block" is inserted at the beginning and an "End block"is inserted at the end of a group of mass values in the GLP report.
Note
To output the report to an AD-8121B , use MODE 3 of the AD-8121B. If MODE1 is used, selecttemporary dump print mode by pressing the STAT. key of the AD-8121B.
If the data memory function is used (except data 0), the "Title block" and "End block" can not be
output.
Key operation
1.

With the weighing data displayed, press and hold the PRINT key(for approx. 2 seconds), then release
the key. 5tart is displayed. The "Title block" is output.

2.

The weighing data is output according to the parameter setting of the data output mode (prt) of thefunction table.

3.

Press and hold the PRINT key (for approx. 2 seconds) until recend is displayed, then release thekey. The "End block" is output.

Setting of "info 1"
AD-8121 printer format-----------A-&-D
MODEL-----GH-300
S/N-----01234567
ID------LAB-0123
DATE--2004/07/01
START
TIME----12:34:56

Title block
Manufacturer
Model
Serial number
ID number
Date
Time

WT--+123.4567--g
WT--+123.4612--g
WT--+123.4623--g
WT--+123.4634--g
WT--+123.4511--g

Weighing data

WT--+123.4534--g
WT--+123.4712--g
WT--+123.4645--g
END
TIME----12:40
15
SIGNATURE---------------<TERM>
CR
LF

Time
Signature

End blockSpace, ASCII 20h
Terminator, CR , LF or CR
Carriage return, ASCII 0Dh
Line feed, ASCII 0Ah
54

Setting of "info 2"
General format

12. Data Memory
Data memory is a function to store weighing data and calibration data in memory. The data stored in memory
are available for outputting at one time to a printer or personal computer.
Weighing data

Excluding date and time
Including date and time

Up to 200 sets
Up to 100 sets

Calibration report
Internal calibration
External calibration
Calibration test report
Internal test calibration
External test calibration

Last 50 sets

12-1. Notes on Using Data Memory
To use the memory function, set the "Data memory (data)" parameter and "Time/Date output (5-td)"
parameter of the function table. Refer to "10. The Function Table" for details on setting the data
memory.
For weighing data, the data contents to be stored and the storage capacity depend on the "Time/Date
output (5-td)" parameter setting.
If a different type of data exists in memory, "Clr" blinks the upper left ofthe display. For example, you want to store weighing data but
calibration data or unit mass data remains in memory. Under such a
condition, before storing data, delete the data in memory as follows:

Upper left ofthe display

Releasing "Clr" or "err"
1. Press and hold the PRINT key (for approx. 2 seconds) until Clr "n"o with "no" blinking is displayed,then release the key.

2. Press the RE-ZERO key to display Clr "g"o with "go" blinking. The type of data stored in memory
appears in the upper left of the display as shown below:

-dd-t
Hi5

Weighing data without time and date
Weighing data with time and date
Calibration report

3. Press the PRINT key to delete all the data in memory.

4. The balance displays end and returns to the weighing mode.

55

12-2. Data Memory for Weighing Data
The balance can store 200 sets of weighing data in memory (if time and date are added, the balancecan store 100 sets). Even if the AC adapter is removed, the data is maintained in non-volatile memory.
It is not necessary to connect the printer or personal computer to the balance continually, because thebalance stores the weighing data in memory.
The data in memory can be output at one time to a printer or personal computer.
The data in memory can be displayed on the balance for confirmation.
Data (ID number, data number, time and date) to be added to the output data can be selected in thefunction setting.

Storing the weighing data
Note
If "Clr" blinks in the upper left of the display, delete the data in memory.

1.

Set the "Data memory (data)" parameter to "1".

2.

Specify the "Time/Date output (5-td)" parameter whether time and date is to added or not.

3.

The storing mode depends on the "Data output mode (prt)" parameter setting.
Four types of storing modes are available to store data.

Key mode ..........................When the PRINT key is pressed and the displayed value is stable, thebalance stores the weighing data.
Auto print modes A...........When the displayed value is stable and the conditions of "Auto print polarity","Auto print difference" and zero point (reference value) are met, the balance
stores the weighing data.
Auto print modes B...........When the displayed value is stable and the conditions of "Auto print polarity","Auto print difference" and last stable data (reference value) are met, thebalance stores the weighing data.
Interval memory mode .....Weighing data is stored at an interval specified in "Interval time (int)". Pressthe PRINT key to start and stop this mode.

The data amountin memory
Memory full

Weighing data
being displayed

Data number of the data
currently displayed
Memory data
being displayed
56Interval memory
standby indicatorInterval memory
active indicatorCaution
When weighing data is being stored in memory, the data can not be output to a personal computer
using the RS-232C interface.
"fUl" indicates that memory is full or the memory capacity has been reached. More data can not be
stored unless the memory data is deleted.
Automatic self calibration can not be used while the interval memory mode is active.
The following commands can not be used during data storage.
Q

Query command for weighing data.

S

Query command for stable weighing data.

SI

Query command for weighing data.

SIR

Query command for continuous weighing data.

Setting the function table
Parameter settings for each output mode are as follows:
Item
Mode

Data output
mode

Auto print polarity,
difference

Data memory
function

Key mode

prt 0

Not useddata 1

Auto print mode A

prt 1

ap-a 0-2

data 1

Auto print mode B

prt 2

ap-b 0-2

data 1

Interval memory mode

prt 3

Not useddata 1

int 0-8No

5-td 0Time only

5-td 1

Date only

5-td 2Both

5-td 3

Interval time

Not used

Additional parameter settings, as follows:
Data number

ID numberNod-no 0Yes

d-no 1No

5-id 0Yes

5-id 1Time and date

Enabling the data memory function
1.

Press and hold the RANGE key (for approx. 2 seconds) until ba5fnc is displayed, then release
the key.

2.

Press the RANGE key several times to display dout .

3.

Press the PRINT key.

4.

Press the RANGE key three times to display data 0 .

5.

Press the RE-ZERO key to display data 1 .

6.

Press the PRINT key to store the setting.

7.

Press the CAL key to return to the weighing mode.
57

Recalling the memory data
Confirm that the "Data memory (data)" parameter is set to "1".
1.

Press and hold the PRINT key (for approx. 2 seconds) until reCall
is displayed, then release the key.

2.

Press the PRINT key to enter the memory recall mode. The type ofdata appears in the upper left of the display as shown to the right. Recall
the data in memory using the following keys.

Indicators
Weighing data
without time and date

RE-ZERO key ····· To proceed to the next data set.
MODE key ............ To go back to the previous data set.
PRINT key ............ To transmit the current data using the RS-232C

interface.

Weighing data withtime and dateWith RANGE held down, press the CAL key to delete the current data.
CAL key ................ To exit the memory recall mode.

3.

Press the CAL key to return to the weighing mode.

Transmitting all memory data at one time
Confirm that the "Serial interface (5if)" parameters are set properly. Refer to "10. Function Table" and"15-2. Connection To Peripheral Equipment".
1.

Press and hold the PRINT key (for approx. 2 seconds) until reCall
is displayed, then release the key.

2.

Press the RANGE key to display out .

3.

Press the PRINT key to display out "n"o with "no" blinking.

4.

Press the RE-ZERO key to display out "g"o with "go" blinking.

5.

Press the PRINT key to transmit all data using the RS-232C interface.

6.

The balance displays Clear when all data is transmitted.
Press the CAL key to return to the weighing mode.

Indicators
Weighing data
without time and date

Weighing data withtime and date

Deleting all memory data at one time1.

Press and hold the PRINT key (for approx. 2 seconds) until reCall is displayed, then release the
key.

2.

Press the RANGE key several times to display Clear .

3.

Press the PRINT key to display Clr "n"o with "no" blinking.

4.

Press the RE-ZERO key to display Clr "g"o with "go" blinking.

5.

Press the PRINT key to delete all data

6.

The balance displays end and returns to the weighing mode.
5812-3. Data Memory for Calibration and Calibration Test
Calibration data (when and how it is performed) and calibration test data canbe stored in memory.
All the data in memory is available to be output at one time to a printer or
personal computer.

Indicator

Up to 50 data sets of the latest calibration or calibration test can be stored.
When the memory capacity has been reached, "fUl" illuminates in theupper left of the display as shown below.

Storing the calibration and calibration test data
Note
If "Clr" appears blinking in the upper left of the display, delete the data in memory.

Store the calibration and calibration test data as follows:1.

Set the "Data memory (data)" parameter to "2".

2.

Set the "GLP output (info)" parameter to "1" or "2".

3.

With the settings above, each time calibration or calibration test is performed, the datais stored automatically.

Transmitting the memory data
Note
Confirm that the "Serial interface (5if)" parameters are set properly. Refer to "10. Function Table" and"15-2. Connection To Peripheral Equipment".
Confirm that the "Data memory (data)" parameter is set to "2".

1.

Press and hold the PRINT key (for approx. 2 seconds) until out isdisplayed, then release the key.

2.

Press the PRINT key to display out "n"o with "no" blinking.

3.

Press the RE-ZERO key to display out "g"o with "go" blinking.

4.

Press the PRINT key to transmit all memory data using the RS-232C interface.

5.

The balance displays Clear when all memory data is output.
Press the CAL key to return to the weighing mode.

59

In the upper leftof the display

Deleting data stored in memory
1.

Press and hold the PRINT key (for approx. 2 seconds) until out
is displayed, then release the key.

2.

Press the SAMPLE key to display Clear .

3.

Press the PRINT key to display Clr "n"o with "no" blinking.

4.

Press the RE-ZERO key to display Clr "g"o with "go" blinking.

5.

Press the PRINT key to delete all data.

6.

The balance displays out and returns to the weighing mode when all
the data has been deleted.

60

In the upper leftof the display

13. Underhook
The underhook can be used for magnetic materials or density measurement. The built-in underhook isrevealed by removing the cap on the bottom of the balance. Use the underhook as shown below.

CautionBottom

Do not apply excessive force to the underhook.
When not in use, attach the cap to prevent dust fromgetting into the balance.
Do not push the underhook upward
When turning the balance over, the weighing pan, pansupport, breeze break ring and dust plate will fall off.
Remove them first.

Underhook
Cap

When the cap is removed, a weighing error may occur,
because of drafts entering into the internal portion of thebalance. Arrange the room condition.

1.

Remove the cap on the bottom of the balance.

2.

Hang your weighing pan on the underhook.
Place the balance on the solid table.

Solid table

Weighing pan

61

14. Density Measurement
The balance is equipped with a density mode. It calculates the density of a solid using the mass value of asample in air and the mass value in liquid.

Note
The density mode was not selected for use when the balance was shipped from the factory.
To use the mode, change the function table and activate the density mode.
When the density mode is selected, the response adjustment function can not be used.
Readability is 0.0001 g while density mode.

Formula to obtain the density
The density can be obtained by the following formula.
ρ=

Where

A

ρ

x ρ0

A- B

:

Density of a sample

A :Mass value of a sample in air

B :Mass value of a sample in liquid

ρ0 :Density of a liquid

Prior to measurement: Changing the function table
Prior to measurement, change the function table as follows:1.

Selecting the density mode. The density mode is available as one of the weighing units. Select it bypressing the MODE key. To use the mode, select it (unit of Unit d .) in the function table.
Refer to "5-2. Changing Units".

2.

Selecting a way to set the density of a liquid. Select the liquid density input method from the function
table below.

Note
The function table is available only when the density mode (d5fnc) is selected. d5fnc is displayed next
5if when density mode is active at Unit.

Class

Item and Parameter

Description

d5 fncldin

0Water temperatureDensity function

Liquid density input

1

Liquid density

is factory setting.

62Entering the density of a liquid
Two ways to set the density of a liquid are available in the function table, "Liquid density input (ldin): byentering the water temperature or by entering the density directly.
1. Press the MODE key as necessary to select the density mode. When thedensity mode begins, "g (gram)" is displayed and the processing indicator ( )blinks.
Entering the water temperature (ldin 0)
2. The water temperature currently set (unit:°C, factory setting : 25°C) is displayed.
Use the following keys to change the value.
RE-ZERO (+)key ....... The key to increase the temperature by one degree.

(0°C is displayed after 99°C)

MODE (-)key.............. The key to decrease the temperature by one degree.

(99°C is displayed after 0°C)

PRINT key ............... The key to store new water temperature, display end and returnto the density mode. Proceed to Step 1.

CAL key ................... The key to cancel the change and return to the density mode.

Proceed to Step 1.

The relation between the water temperature and density
°C

+0

+1

+2

+3

+4

+5

+6

+7

+8

+9

0

0.99984

0.999900.99994

0.999960.99997

0.999960.99994

0.999900.999850.99978100.999700.999610.999490.999380.999240.999100.99894

0.99877

0.99860

0.9984120

0.998200.997990.99777

0.997540.99730

0.99704

0.99678

0.99651

0.99623

0.9959430

0.99565

0.99534

0.99503

0.99470

0.994370.99403

0.99368

0.99333

0.99297

0.9925940

0.992220.99183

0.99144

0.99104

0.990630.990210.98979

0.989360.98893

0.9884950

0.98804

0.98758

0.987120.98665

0.98618

0.985700.985210.98471

0.984220.9837160

0.983200.98268

0.98216

0.981630.981100.98055

0.98001

0.97946

0.97890

0.9783470

0.97777

0.977200.97662

0.97603

0.975440.974850.97425

0.973640.97303

0.9724280

0.971800.971170.970540.969910.96927

0.968620.96797

0.967310.96665

0.9660090

0.96532

0.96465

0.96397

0.96328

0.96259

0.961900.961200.96050

0.95979

0.95906

Entering the density directly (ldin 1)
3. The density currently set (unit : g / cm3, factory setting : 1.0000g / cm3) is displayed.
Use the following keys to change the value. The range to set the density is 0.0000g /cm3 to 1.9999g / cm3.
RE-ZERO (+)key .....The key to set the value of the digit selected.
RANGE (-)key .........The key to select the digit to change the value.
PRINT key .............The key to store the change, display end and return to the density mode.

Proceed to Step 1.
CAL key .................The key to cancel the change and return to the density mode. Proceed to Step 1.

63

Measuring the density
Note
If the liquid temperature or the type of liquid is changed during measurement, input again the valueof the liquid density as necessary. Density display is four decimal places. Readability can notchange with the RANGE key.
Denisty is displayed after "Mass measurement in air" and "Mass measurement in liquid". The procedureof each measurements is as follows:
From "Entering thedensity of a liquid"
1. Enter the density mode that "g (gram)" is displayed andthe processing indicator ( ) blinks. Place nothing on
both pan and press theWeighing in air.
g lights.
blinks.
RE-ZERO key to display zero.

2. Place the sample on the pan in air.
If the weight value is stored or output, press the
PRINT key to store it after a stable weight value isdisplayed.
Press the RANGE key to decide the weight value in
air and proceed to next step.
Note
If negative value or E (out of range) is displayed, theRANGE key is inactive.

3. Move the sample to the pan in liquid.
If the weight value is stored or output, press the
PRINT key to store it after a stable weight value isdisplayed. Press the RANGE key to decide the weightvalue in liquid and proceed to next step.
Note
If E (out of range) is displayed, the RANGE key isinactive.

Place sample on the pan in air
Weighing in air.
g lights.
blinks.
Output or store

Move sample from the pan in air tothe pan in liquid
Weighing in liquid.
g lights.
lights.
Output or store

Density display.
g turns off.
lights.
Output or store

4. If the density value is stored or output, press the
PRINT key to store it. Press the RANGE key tomeasure other sample and proceed to step 2.

5. If the liquid temperature or the type of liquid is changed
during measurement, input again the value of the liquiddensity as necessary.

6. Press the MODE key to proceed to other modes.
64

Remove sample

15. Standard Input and Output Interface
15-1. RS-232C Interface
The balance is a DCE device. Connect the balance to a personal computer (DTE) using a straight throughcable.
Transmission system: EIA RS-232C

Transmission form

: Asynchronous, bi-directional, half duplex

Transmission rate

: 10 times/second or 5 times/second (same as data refresh rate)

Data format: Baud rate

: 600, 1200, 2400, 4800, 9600, 19200bps

Data bits: 7 or 8 bits

Parity: Even, Odd(Data bits 7 bits)

None(Data bits 8 bits)

Stop bit: 1 bitCode: ASCII

RS-232C-5V to -15V
+5V to +15V

D-Sub 25 pin assignments
Pin No.
1
2
3
4
5
6
7
8
9

Data bits
Start bit

Signal name
Direction
Description
No connection
RXD
OutputTransmit data
TXD
Input
Receive data
No connection
SG
Signal ground
DSR
OutputData set ready
RTS
Input
Request to send
CTS
OutputClear to send
No connection
All signal names mean name for the DTE side.
Balance side
DCE

+5V
3.3kΩ

Stop bit
Parity bit#4-40UNC
Computer side
DTE

RXD

2

TXD

3

RTS

7

CTS

8

DSR

6

SG

5

RXD
TXD
RTS
CTS
DSR
SG

Inside of balance

Terminal example
6515-2. External Contact Input
External contact input terminal

Compatible plug: φ3.5 mm 3-pole stereo plug
MP-013LC or the equivalentAppearance diagram

External contact input

Example of external contact input terminal

External contact input circuit

Pin assignments
Pin No.

Description

1

GND

2

RE-ZERO

External contact input

3

PRINT

External contact input

When pin1 and pin 3 or pin1 and pin2 are shorted 100 ms or longer, the switch can operate the balance in thesame way as the balancePRINT

key or the

RE-ZERO

key, respectively.

□ AX-SW137-PRINT or AX-SW137-REZERO (optional foot switches sold separately) can be used.

66

15-3. Connection to Peripheral Equipment
Connection to an AD-8121B printerPreset the following parameters to use the AD-8121B printer.
Factory
AD-8121B
Class
Item and Parametersettings
MODE 1prt
00,1,2
Data output mode
ap-p0
Auto print polarity
#1
ap-b
1
Auto print differenced-no00
Data number output
dout
5-td
Data output
00Time/Date output
5-id
00
ID number output
pU5e00Data output pause
at-f00Auto feedbp5
2
2
Baud ratebtpr
00
Data bit, parity bit
5if
Crlf
Serial00Terminatorinterfacetype
00Data format
Ct500CTS, RTS control

AD-8121B
MODE 2AD-8121B
MODE 3

3

0,1,2

Not
necessary

#1

0

0,1

0

0,1,2,300,100,1 #2

0

0,1

2

2

0

0

0

0

0

1

0

0

#1 Set parameters when auto print mode A or B (prt 1 or 2) is selected.
#2 Set 1 when multiple lines are printed. Example: When appending ID number, set 1.
Notes
Refer to "11-2. GLP Report" concerning print samples.
Settings of AD-8121B
AD-8121B
Description
MODE
DIP switch
MODE
Print at receiving data.
MODE 1
Standard mode, statistic mode
1 2 3 4ON

1 2 3 4MODE

1 2 3 4

ON

MODE 3MODE

ON

MODE 2Print by DATA key operation or built-in timer.
Standard mode, interval mode, chart mode
Print at receiving data.
Dump print mode

DIP switch No.3 : Handling unstable data
MODE
ON Print
OFF Not printed
DIP switch No.4 : Data input specifications (Interface selection)
MODE
ON Current loop
OFF RS-232C
1 2 3 4ON

1 2 3 4

ON

67

Connecting to the AD-8127 PrinterWhen connecting the AD-8127 printer to the balance for printing weighing data, configure the printer and thebalance as follows according to the usage examples.

Function settings of the printerAD-8127
Usage example

Multi printerPrinting mode settings

When printing the balance weighing datawith the balance’s

PRINT

key or its “Auto

EXT.KEY

When printing the balance weighing data

MANUALwith the printer’s “Printing” key or its “Interval

AUTO

printing” mode.

TIMER

When printing charts with the printer.

CHART

When printing the balance’s GLP report.

DUMP

print” mode.

□

Refer to the instruction manual of the AD-8127 printer for how to change the function settings of the
AD-8127 printer.

Function settings of the balance
Balance

Balance

Data output mode

Data format

0,1, 20

3

00,1, 2

1

Usage example
When printing the balance weighing datawith the balance’s

PRINT

key or its “Autoprint” mode.
When printing the balance weighing datawith the printer’s “Printing” key or its “Interval
printing” mode.
When printing charts with the printer.
When

printingthebalance’s

statistical

calculation results.
When printing the balance’s GLP report.
□

Refer to “10. Function Table” for how to change the function settings of the balance.

68Connecting to a Computer Using the RS-232C Interface
Features

The balance is of the DCE type (Data Communication Equipment), which can be connected to a personal
computer using the RS-232C interface. Before connection, read the personal computer manual thoroughly.
Use a standard DCE cable for connection (cable type: straight-through).

Using Windows Communication Tools Software (WinCT)

When Windows is used as an operating system in a personal computer, the WinCT software can be used totransmit the weighing data to the personal computer. The current version of the WinCT can be downloaded
from the A&D website. Confirm the windows version supported by this software when downloading. Refer tothe WinCT instruction manual in the A&D website. The WinCT software has three communication methods:"RsCom" , "RsKey" and "RsWeight".

RsCom

RsCom can transmit commands to control the balance.

RsCom can make bi-directional communication between the balance and a personal computer using the
RS-232C interface.
RsCom can display or store the data using a text file format. RsCom can also print the data using a printerconnected to the personal computer.
When several ports of a personal computer have balances connected, the personal computer cancommunicate with each balance simultaneously.
RsCom can share a personal computer with other application software.
RsCom can receive the balance GLP report.

RsKey

RsKey can transmit the weighing data output from the balance directly to other application software such as
Microsoft Excel.
RsKey can be used with most application software.
RsKey can receive the balance GLP report.

RsWeight

Can retrieve the weight data from the balance and display the data as a graph in real time.
Can calculate and display the maximum, minimum, average, standard deviation and coefficient of variation.

Using the WinCT software, the balance can do the following:

Analyzing the weighing data and the statistics input by "RsKey"
The weighing data can be input directly into an Excel worksheet. Then, Excel can analyze the data to obtaintotal, average, standard deviation, maximum and minimum values, and display them in a graph.
Controlling the balance using commands from a personal computer
By using "RsCom", the personal computer sends commands such as "re-zero" or "send weighing data" to thebalance and controls the balance.
Printing the balance GLP report using your printerThe balance GLP report can be printed using a printer connected to the personal computer.
Receiving weighing data at a certain interval
The weighing data can be received at a certain interval and data characteristic with elapsed time can beobtained.
Using the balance memory function
The data can be stored in the balance’s memory. Of the data stored, the weighing data and calibration data
can be transmitted to a personal computer at one time.
Using a personal computer as an external indicator
With the "RsKey" test mode function, a personal computer can be used as an external weight indicator for thebalance. (To do this, set the balance data output mode to stream mode.)6915-4. Commands
15-4-1 Command List
Note
A command has a terminator added, that is specified using "5if Crlf" of the function table, and is sent
to the balance.
Commands to query weighing data
C
Cancels the S or SIR command.
Q
Requests the weighing data immediately.
S
Requests the weighing data when stabilized.
SI
Requests the weighing data immediately.
SIR
Requests the weighing data continuously.
Commands to control the balanceSame as the CAL key.
CAL
Turns the display off.
OFF
Turns the display on.
ON
Same as the ON:OFF key
P
Same as the PRINT key
PRTSame as the RE-ZERO key (Note 1)
R
Same as the RANGE key.
RNG
Tares the balance (Cancels the container’s weight.) (Note 1)
TR
Perform calibration test.
TST
Same as the MODE key
U
Commands to request data
Requests the identification number.
?ID
Outputs the tare value. (Note 1)?PT
Request the serial number of the balance.
?SN
Request the model name of the balance.
?TN
Command to set data
PT:∗∗∗.∗∗∗∗ g

Sets the tare value. (Note 1)

Note
R command assumes the point as zero and sets the display to zero.
TR command cancels the tare weight when the displayed value is greater than zero.
The canceled tare value can be read using the ?PT command.
PT: command sets the tare value digitally.
An example of this command sets a negative target value and fills with the sample until the display
becomes zero.
Step 1 Place a container.
Step 2 Set the display to zero using the R command.
Step 3 Set a target value using the PT: command.
For details, refer to page 75.
70

15-4-2 Acknowledge Code and Error Codes
When the "Serial interface function (5if)" parameter is set to "erCd 1", the balance outputs <AK> code or
error code to each command as follows:<AK> (06h)Acknowledge in ASCII code.
When the balance receives a command to request data and can not process it, the balance transmits
an error code (EC, Exx). When the balance receives a command to request data and can process it,
the balance outputs the data.
When the balance receives a command to control the balance and can not process it, the balancetransmits an error code (EC, Exx). When the balance receives a command to control the balance andcan process it, the balance transmits the acknowledge code.
Among commands to control the balance, the following transmit the acknowledge code bothwhen the balance receives the command and when the balance has accomplished the command.
If the command can not be processed properly, the balance transmits an error code (EC, Exx).
This error can be released using the CAL command.
CAL command (Calibration command using internal mass)
ON command (Display ON command)
P command (Display ON/OFF command)
R command (RE-ZERO command)
TR command (Tare command)
TST command (Calibration test command)
When a communication error has occurred due to external noise, or a parity error has occurred due totransmission error, the balance transmits an error code. In this case, send the command again.
xx is error code number.

15-4-3 Control Using CTS and RTS
Depending on the "Ct5" parameter of "Serial interface (5if)", the balance performs as follows:

Ct5 0
Regardless of whether the balance can receive a command or not, the balance keeps the CTS line HI. Thebalance outputs data regardless of the condition of the RTS line.

Ct5 1
The CTS line is kept Hi normally. When the balance can not receive the next command (Example: while thebalance is processing the last command), the balance sets the CTS line to Lo. The balance confirms the levelof the RTS line before outputting a set of data. If the RTS level is Hi, the balance outputs data. If the RTS level
is Lo, data is not output (The data is canceled).

15-4-4 Settings Related to RS-232C
Concerning the RS-232C, the balance has two functions: "Data output (dout)" and "Serial interface (5if)".
Set each function as necessary.

7115-4-5 Command Examples
This example uses the "erCd 1" of "5if" so that the <AK> (06h) code is output.

ON command (turning on the balance)
Computer

Time

BalanceStandby mode

ON command

Command received
All segments

All segments are displayed

Command completed
Zero display

R command (Re-zeroing the display)
Computer

Time

Balance
Weighing mode

R command

Command received
In process

Command completed
Zero display

72

CAL command (Calibration with internal mass)
Computer

Time

BalanceZero display

CAL command

Command received
Command completed
Zero display

Error code
This example is of an error using the R command. "erCd 1" is used. The balance transmits an error codewhen the received command can not be achieved.

Computer

Time

Balance
Weighing mode (unstable)

R command

Command received
In process
When the R command can not be
achieved due to unstable weighing:Error code

When the CAL command is received,
the balance returns to the weighing mode

CAL command

Command completed
Weighing mode73

15-4-6 The Example of Weighing with a Tare
This example uses "erCd 1" of "5if" so that the <AK> (06h) code is output.
Computer

Time

Balance

R command

Sets the display to zeroCommand received
In process

Command completed
Zero display

Place a container
TR command

ＴＲ

Tares
Command received
In process

Command completed
Zero display

S commandＳ?PT command？ＰＴ

ＳＴ，＋０１０．００００(Net value)ｇ

ＰＴ，＋０１２．３４５６ｇ(Tare value)7415-4-7 The Example of Setting a Negative Target Value and Filling with a
Sample until the Display Becomes Zero
This example uses "erCd 1" of "5if" so that the <AK> (06h) code is output.
Computer

Time

Balance
Place a container
Before commandexecution

R command

Command received
In process

Command completed
Zero display

PT: command to set a target weight of 10 g

Command received
Target weight display

Fill with sample until thedisplay becomes zero75

16. Maintenance16-1. Treatment of the Balance
Clean the balance with a lint free cloth that is moistened with warm water and a mild detergent.
Do not use organic solvents to clean the balance.
Do not disassemble the balance. Contact the local A&D dealer if the balance needs service orrepair.
Use the original packing material for transportation.
Consider "3. Precautions" when operation the balance.

16-2. Error Codes
Display

Error code Description
EC, E11EC, E16

EC, E17
EC, E20
EC, E21

Stability error
The balance can not stabilize due to an environmental problem. Checkaround the pan. Prevent vibration, drafts, temperature changes, static
electricity and magnetic fields, from influencing the balance. To returnto the weighing mode, press the CAL key.
Internal mass error
Applying the internal mass does not yield a change in the mass value
as specified.Confirm that there is nothing on the pan and perform theweighing operation from the beginning again.
Internal mass error
The internal mass application mechanism does not function properly.
Perform the weighing operation from the beginning again.
Calibration weight error
The calibration weight is too heavy. Confirm the calibration mass value.
Press the CAL key to return to the weighing mode.
Calibration weight error
The calibration weight is too light. Confirm the calibration mass value.
Press the CAL key to return to the weighing mode.
Overload error
A sample beyond the balance weighing capacity has been placed on
the pan. Remove the sample from the pan.
Weighing pan Error
The mass value is too light. Confirm that the weighing pan is properly
installed and calibrate the balance.
Sample mass error
The balance can not store the sample for the counting mode or for thepercent mode because it is too light. Use a larger sample.

76Display

Error code Description(Check NG)"f "U "lfU l

"C "l "r(Blinking)(Illuminated)

Unit mass error
The sample unit mass for the counting mode is too light. Storing andusing it for counting will cause a counting error. Add samples to reachthe specified number and press the PRINT key. Pressing the
PRINT key without adding samples will shift the balance to thecounting mode. But, for accurate counting, be sure to add samples.
Automatic response adjustment zero error
The automatic response adjustment can not be performed because
there is something on the pan. Clear the pan. Press the CAL key toreturn to the weighing mode.
Automatic response adjustment unstable error
The automatic response adjustment can not be performed because
the mass value is unstable. Check the ambient conditions such as
breeze, vibration and magnetic fields, also check the weighing pan.
Press the CAL key to return to the weighing mode.
Clock battery error
The clock backup battery has been depleted. Press any key and set
the time and date. The clock and calendar function works normally as
long as the AC adapter is connected to the balance. If this error
appears frequently, contact the local A&D dealer.
Low battery error
Voltage of the power supply drops. Confirm whether the correct ACadapter is used.
Memory full
The amount of weighing data in memory has reached the maximum
capacity. Delete data in memory to store new data. For details, refer to"12. Data Memory".
Memory full
The amount of calibration or calibration test data in memory hasreached the maximum capacity (50 sets). The data in memory will bedeleted automatically to store new data. For details, refer to "12. Data
Memory".
Memory type error
Type of memory set in the function table and type of data stored are
different. For details, refer to "12. Data Memory".
Memory data error
The stored data were destroyed. To use the memory function, erase all
the old data and release the error. For details, refer to "12.1. Notes on
Using Data Memory".

77

Display

Error code Description
Communications error

EC, E00 A protocol error occurred in communications. Confirm the format, baudrate and parity.

EC, E01

EC, E02

EC, E03

EC, E04

EC, E06

EC, E07
Other error code

Undefined command error
An undefined command was received. Confirm the command.
Not readyA received command can not be processed.
Example:The balance received a "Q" command, but not in the weighingmode.
The balance received a "Q" command while processing a RE-ZEROcommand. Adjust the delay time to transmit a command.
Timeout error
If the timeout parameter is set to "t-Up1", the balance did not receive
the next character of a command within the time limit of one second.
Confirm the communication.
Excess characters error
The balance received excessive characters in a command. Confirm
the command.
Format error
A command includes incorrect data.
Example:The data is numerically incorrect.
Confirm the command.
Parameter setting error
The received data exceeds the range that the balance can accept.
Confirm the parameter range of the command.
If an error described above can not be released or other errors are
displayed, contact the local A&D dealer.

16-3.Other Display
When this indicator blinks, automatic self calibration is required. The indicator
blinks when the balance detects changes in ambient temperature. If the balance is
not used for several minutes with this indicator blinking, the balance performs
automatic self calibration. The blinking period depends on the operating
environment.
AdviseThe balance can be used while this indicator is blinking. We recommend that you
perform automatic self calibration for precision weighing.

78

16-4. Checking the Balance Performance and Environment
The balance is a precision instrument. When the operating environment or the operating method isinadequate, correct weighing can not be performed. Place a sample on the pan and remove it, and repeat
this several times. If the balance seems to have a problem with repeatability or to perform improperly, checkas described below. If improper performance persists after checking, contact the local A&D dealer for repair.

Checking that the operating environment or weighing method is proper
Operating environment
Is the weighing table solid enough?
Is the balance level?
Is the operating environment free from vibration and drafts?
Is there a strong electrical or magnetic noise source such as a motor near the balance?
Weighing method
Does the weighing pan rim touch anything? Is the weighing pan assembly installed correctly?
Is the RE-ZERO key pressed before placing a sample on the weighing pan?
Is the sample placed in the center of the weighing pan?
Is the fine range breeze break ring installed for weighing with a readability of 0.01 mg for the
GH-252 and GH-202?
Has the balance been calibrated using the internal mass (one-touch calibration)?
Has the balance been warmed up for one hour before weighing?
Sample and containerHas the sample absorbed or lost moisture due to the ambient conditions such as temperature andhumidity?
Has the temperature of the container been allowed to equalize to the ambient temperature?
Is the sample charged with static electricity?
Is the sample of magnetic material such as iron? There are cautions about weighing magnetic
materials.

Checking that the balance performs properly
Check the balance performance using an external weight. Be sure to place the weight in thecenter of the weighing pan.
Check the balance repeatability, linearity and calibrated value using external weights with a known
value.

79

16-5. Asking for Repair
If the balance needs service or repair, please consult with your local A&D dealer. The balance is a precision
instrument. Use much care when handling the balance and observe the following when transporting thebalance.
Use the original packing material for transportation.
Remove the weighing pan, pan support, breeze break ring and dust plate from the main unit.

80

17. Specifications
GH-120GH-200GH-300Weighing capacity

120 g

220 g

320 g

Maximum display

120.0084 g

220.0084 g

320.0084 g

Readability

GH-202GH-252

220 g

250 g

51 g

101 g

220.0084 g

250.0084 g

51.00009 g

101.00009 g

0.1 mg

0.1 mgRepeatability

0.01 mg

0.1 mg(Standard deviation)
Linearity

0.2mg±0.2 mg

Stabilization time

±0.3 mg

0.1 mg0.02 mg±0.03 mg

Sensitivity drift,±0.10 mgApprox. 3.5 seconds

Approx. 3.5 seconds(Typical at FAST )0.03 mg±0.2 mgApprox. 8 seconds±2 ppm/°C

10°C to 30°C / 50°F to 86°F

5°C to 40°C, 85%RH or less (No condensation)

Display refresh rate
Minimum unit
mass
Number ofsamples
Minimum 100%
reference mass
% readability

5 times/second or 10 times/second
0.1 mgmode
mode

Percent

Counting

Operating environment

10, 25, 50 or 100 pieces
10.0 mg
0.01 %, 0.1 %, 1 % (Depends on the reference mass stored.)Interface

RS-232C
300g

Applicable weights forcalibration

100g

200g

200g

200g

100g

100g

100g
50g

50g

20g
Weighing pan
External dimensions

φ90 mm217(W) x 442(D) x 316(H) mm

Mass
Power supply &AC adapter type
Current consumption

Approx. 8.2 kg
Power consumption: Approx. 30VA (supplied to the AC adapter)
Confirm that the adapter type is correct for the local voltage and power
receptacle type.
DC12V, approx. 0.3A (excluding the AC adapter and options)

The operating environment does not include excessive change of ambient temperature, humidity, vibration,
drafts, magnetic fields and static electricity.
The internal mass may change due to corrosion or other damage caused by the operating environment, ordue to aging. Check the internal mass periodically and correct the internal mass value if necessary.

8117-1. External Dimensions

Unit: mm82

17-2. Options and Peripheral Equipment
GH-02 USB interface
The interface to connect a balance to a personal computer, andis used to transmit the balance weight data to the personal
computer via USB. Applicable OS is Windows 98 or later.
As the Windows standard driver is used to transmit the weighing
data, complicated installation of a dedicated driver is notnecessary.
The balance weighing data can be transmitted to applications
such as Excel, Word and memo pad for Windows automatically.
To perform bi-directional communications using WinCT or to
output GLP data to a personal computer by using the personal
computer USB interface, use the AX-USB-9P USB converter.

GH-08 Ethernet Interface
The interface to connect the balance to a LAN.
Accessory: The "WinCT-Plus" data communication software.
The software can acquire data from multiple balances
connected to a LAN.
The software can control these balances with commands.
The software can acquire data transmitted from balances.
Example: When pressing the PRINT key of the balance,data is output and is acquired by the computer.
The stored data can be used with Microsoft EXCEL (if installed).

83AD-1653 Density Determination Kit
Weigh in air
x water density = sample density
Weigh in water - Weigh in the air

Example:10.0000 g
x 0.9970 g/cm3 = 21.4 g/cm3
10.0000 g － 9.5334 g

Temperature
0°C
10°C
20°C
30°C

Water density
0.99984 g/cm3
0.99970 g/cm3
0.99820 g/cm3
0.99565 g/cm3

OptionAD-8127: Multi printerSmall dot impact printer that connects to the balance via the RS-232C interface.
Statistical calculation mode, calendar/clock function, interval printing mode, chart printing mode,
dump printing mode
AD-1691: Balance environment analyzer
During the routine inspection, repeatability and the readability can be easily checked.
Also, this calculates measurement uncertainty and supports environmental evaluation of the balance.
This analyzer can be easily carried to the balance site, so more than one balance can becontrolled using this analyzer.
AD-1687: Weighing environment logger
A data logger equipped with 4 sensors for temperature, humidity, barometric pressure and vibrationthat can measure and store environmental data. When connected to the RS-232C interface of thebalance, the AD-1687 can store environmental data along with weighing data. Therefore, it is possible
to store data in an environment where a computer cannot be used.
The stored data can be read to a personal computer using USB. As the AD-1687 is recognized as
USB memory, special software is not required to read the data.
AD-1688: Data logger
When connected to the RS-232C interface of the balance, the AD-1688 can store the data in anenvironment where a personal computer cannot be used.
AD-8526: Ethernet converter
This option can be used to connect the RS-232C interface of the balance to the Ethernet (LAN) portof a computer. This allows management of the balance weighing data with a computer connected toa network.
AD-8527: Quick USB adapter

This option transmits the weighing data directly to software applications such as Excel and Word.
AD-8920A: Remote display

Connected to the balance using the RS-232C interface.

84AD-8922A: Remote controller

This option can be connected to the balance using the RS-232C interface and can control thebalance remotely. Various options such as comparator output or analog output are available.
AX-USB-9P: USB converter
Adds a COM port to a personal computer.
Enables bi-directional communication between the personal computer and the balance when a USB
driver is installed.
Can use serial communication software such as WinCT on a personal computer without COM ports.
An RS-232C cable is provided to connect the USB converter to the balance.
AD-1671: Anti-vibration table
Approximately 27 kg, Artificial stone (Terrazzo).
Use this table when unstable weighing is caused by vibration coming from the floor.
Use the AD-8922A remote controller to avoid a weighing error by a slight table tilt that key
operation may make.
AD-1672/AD-1672A: Tabletop breeze break (Large)
Large sized table breeze breakProtects the balance from wind from sources such as air conditioning or people passing by,
thereby reducing balance weighing errors.
The transparent panel assembly consists of antistatic plastic material that protects the balancefrom static electricity.
Samples can be inserted or removed through the opening on the front.
AD-1672: 680(W) x 600(D) x 720(H) mm, AD-1672A: 680(W) x 584(D) x 720(H) mm
AD-1676: Tabletop breeze break (Medium)
A tabletop breeze break of a size best suited for the BM / GH / HR-i series balances.
Protects the balance from wind from sources such as air conditioning or people passing by,
thereby reducing balance weighing errors.
The transparent panel assembly consists of antistatic plastic material that protects the balancefrom static electricity.
Sliding panels on the right and left side enable samples to be inserted or removed from each side.
368(W) x 514(D) x 350(H) mm (Including the handle)
AD-1682: Rechargeable Battery
This option allows use of the balance in a place where AC power is not available.
AD-1683/AD-1683A: Ionizer
Static eliminator that prevents error which can be caused when weighing samples are electricallycharged.
Its direct-current system and plentiful ion content enable weighing without breeze, which is ideallysuited for precisely measuring powder and such.
The built-in IR Sensor enables removal of static electricity in a touchless way. (AD-1683A only)
AD-1684A: Electrostatic field meter
This option measures the amount of the static charge on the sample, tare or peripheral
equipment and displays the result.
If those are found to be charged, discharge them using an ionizer such as AD-1683A.
AD-1689: Tweezers for calibration weight
A pair of tweezers ideally suited for holding calibration weights of 1 g to 500 g.
AD-8529PC-W: Bluetooth converter (for connecting a personal computer)*This option connects a personal computer to the balance wirelessly (via Bluetooth) up to 10 m.
Driver installation is required.
AD-8529PR-W: Bluetooth converter (for connecting a printer)*This option connects a printer to the balance wirelessly (via Bluetooth) up to 10 m.
85

*Note on the AD-8529PC-W and AD-8529PR-W
The two products may require certification for compliance with local laws pertaining to radio broadcast
and equipment for wireless communication. Please refer to the A&D website for countries where theproducts are already certified for use.
AX-KO5363-30: Connection cable for a weighing device with D-sub25 pin
The AD-8529PC-W or AD-8529PR-W (Bluetooth converter) can be connected to the GH seriesbalances using this optional cable.
AX-SW137-PRINT: Foot switch print function with a plug
The foot switch has the same function as the PRINT key.
AX-SW137-REZERO: Foot switch rezero function with a plug
The foot switch has the same function as the RE-ZERO key.

86

18. Terms
Calibration

Adjustment of the balance so that it can weigh accurately.

Calibration weight

A weight used for calibration

Data number

Numbers assigned sequentially when weighing data or unit weight is stored.

Digit

The readability available. Used for the balance, one digit is the smallest mass thatcan be displayed.

Environment

Ambient conditions such as vibration, drafts, temperature, static electricity andmagnetic fields which affect the weighing operation.

External weight

The weight that you have.

GLP

Good Laboratory Practice.

GMP

Good Manufacturing PracticeInternal mass

Built-in calibration weight

ISOInternational Organization for Standardization

Repeatability

Variation in measured values obtained when the same mass is placed andremoved repetitively. Usually expressed as a standard deviation.
Example: Standard deviation = 1 digit: This means that measured values,
obtained when the same sample is placed and removed repetitively, fall within ±1
digit in the frequency of about 68%.

Re-zeroTo set the display to zero.

Sensitivity drift

An affect that a change in temperature causes to the weighing data. Expressed asa temperature coefficient.
Example: Temperature coefficient = 2 ppm/°C : If a load is 10 g and thetemperature changes by 10°C, the value displayed changes by the following
value.
0.0002%/°C x 10°C x 10g = 0.0002 g

Stabilization time

Time required after a sample being placed, until the stabilization indicatorilluminates and the weighing data is displayed.

Tare

To cancel the mass value of a container which is not to be included in theweighing data. Normally, refers to an operation of placing a container and setting
the display to zero.

Target mass

An external weight used for calibration test

Zero point

A weighing reference point. Usually refers to the value displayed when nothing ison the weighing pan.

87

1. Back cover: A&D Global

A&D Company, Limited

3-23-14 Higashi-Ikebukuro, Toshima-ku, Tokyo 170-0013, JAPAN
Telephone: [81] (3) 5391-6132
Fax: [81] (3) 5391-1566

A&D ENGINEERING, INC.

1756 Automation Parkway, San Jose, California 95131, U.S.A.
Telephone: [1] (408) 263-5333
Fax: [1] (408)263-0119

A&D INSTRUMENTS LIMITED

Unit 24/26 Blacklands Way, Abingdon Business Park, Abingdon, Oxfordshire OX14 1DY United Kingdom
Telephone: [44] (1235) 550420
Fax: [44] (1235) 550485

A&D AUSTRALASIA PTY LTD

32 Dew Street, Thebarton, South Australia 5031, AUSTRALIA
Telephone: [61] (8) 8301-8100
Fax: [61] (8) 8352-7409

A&D KOREA Limited

한국에이.엔.디(주)OOO A&D RUS

OOO "ЭЙ энд ДИ РУС"서울특별시 영등포구 국제금융로6길33 (여의도동) 맨하탄빌딩 817 우편 번호 07331( 817, Manhattan Bldg., 33. Gukjegeumyung-ro 6-gil, Yeongdeungpo-gu, Seoul, 07331 Korea )전화: [82] (2) 780-4101
팩스: [82] (2) 782-4264
Почтовый адрес:121357, Российская Федерация, г.Москва, ул. Верейская, дом 17Юридический адрес: 117545, Российская Федерация, г. Москва, ул. Дорожная, д.3, корп.6, комн. 8б
( 121357, Russian Federation, Moscow, Vereyskaya Street 17 )тел.: [7] (495) 937-33-44
факс: [7] (495) 937-55-66

A&D Instruments India Private Limited( 509, Udyog Vihar, Phase- , Gurgaon - 122016, Haryana, India ): [91] (124) 4715555: [91] (124) 4715599

A&D SCIENTECH TAIWAN LIMITED. A&D台灣分公司 艾安得股份有限公司
台湾台北市中正區青島東路 5 號 4 樓
( 4F No.5 Ching Tao East Road, Taipei Taiwan R.O.C. )Tel : [886](02) 2322-4722
Fax : [886](02) 2392-1794

A&D INSTRUMENTS (THAILAND) LIMITEDบริษัท เอ แอนด ดี อินสทรูเมนท (ไทยแลนด) จํากัด
168/16 หมูที่ 1 ตําบลรังสิต อําเภอธัญบุรี จังหวัดปทุมธานี 12110 ประเทศไทย
( 168/16 Moo 1, Rangsit, Thanyaburi, Pathumthani 12110 Thailand )Tel : [66] 20038911