CAUTION
1. Correct measurement may not be performed when using the meter in aferromagnetic/intense electric field such as a place near a transformer,
high-current circuit or a radio.
2. The meter may malfunction or correct measurement may not be performed
when measuring a special waveform such as that from an inverter circuit.

1-3 Overload protections
Function

DIGITAL MULTIMETER

Max. rated input value
AC 600 V

DCV

DC 600 V/

CD800b

Input terminals

ACV Hz/+ (Red)and- (Black)/

mA AC/DC

Max. overload protection input
AC/DC 660 V
AC/DC 600 V

Voltage input prohibited

0.6 A/600 V fusebreaking capacity 10 kA

2-1 Applications

2-2 Features
Dempa Bldg., 4-4 Sotokanda 2-Chome
Chiyoda-ku, Tokyo 101-0021, Japan

02-1704 2040 6006

[1] SAFETY PRECAUTIONSBefore use, read the following safety precautions.

• Safety design compliant to IEC61010.
• AC measurements with True RMS conversion.
• High portability thanks to the case-integrated design.
• Backlight.
Measurement categories (Overvoltage categories)
CAT. II : Primary circuit of equipment with a power cord to be connected to amains socket.
CAT.III : Primary circuit of equipment that inputs power directly from the
distributor and the circuit from the distributor to the mains socket.
CAT.IV : Circuit from the leading wire to the distributor.

This instruction manual explains how to use your new digital multimeter CD800b
safely. Before use, please read this manual thoroughly. After reading it, keep it[3] NAMES OF COMPONENT UNITS

The meaning of the symbols used in this manual and attached to the product is
as follows.
: Very important instructions for safe use.
• The WARNING messages are intended to prevent accidents to operating
personnel such as burn and electrical shock.
• The CAUTION messages are intended to prevent damage to the instrument.
Symbols attached to the product: Symbol soliciting reference to this manual before use: Double or enhanced insulation: Ground: Resistance: Diode: Buzzer: Capacitance: Backlight: Fuse3-1 Multimeter and test leads

Display

Test pins

Removable test pin covers
View when not attached

HOLD button△ REL button

Finger guards

Display

Removable test pin covers
When covered: CAT.IV 300 V
CAT.III 600 V
When uncovered: CAT.II 600 V
Test probe (red)

SELECT button
RANGE button

Test probe (black)

Power/function switch

3-2 Display

Coverage

Note

0.000 - 3.000 V

Open voltage across input terminals: About 3.2 V“OL” is displayed at 3.000 V or more.

Forward test

Unit

: Voltage alarm: Data Hold indicator: Auto Range indicator: Low battery indication: Auto Power Save indicator: Relative operation indicator: Continuity check: Diode: Capacitor: Alternative Current: Direct Current: MAX/MIN mode indicator

3-3 Attaching the strap
Hand strap

CathodeReverse test

Example of Good item:“OL” display
Example of NG item:
Other display)

Note : As the internal resistance of the current range comes in series, the current
measured in the current measurement drops accordingly. This influence
becomes important in a circuit with low resistance.

[6] MAINTENANCE

6-1 Maintenance and inspection
1) Appearance• Is the appearance not damaged by falling?
2) Test leads• Is the cord of the test leads not damaged or the core wire not exposed at
any place of the test leads?

CoverageNote

0.0 - 600.0 ΩOpen voltage across input terminals: About 1.0 V

The buzzer beeps at 10 to 50 Ω or less.

If any of the above is found with the appearance, do not use the equipment
and have it repaired.

6-2 Calibration
The manufacturer may conduct the calibration and inspection. For more
information, please contact the dealers.

6-3 Cleaning and storage
CAUTION)

Coverage

Range

0.00 - 600.0 μF

60.00 n/600.0 n/6.000 μ/60.00 μ/600.0 μ

Discharge the capacitor before
measurement.
It takes a while to measure large
capacitance.
This measurement is not suitable formeasurement of a capacitor with ahigh leak current such as anelectrolytic capacitor.

1. The main unit is not resistant to volatile solvent and must not be cleaned
with lacquer thinner or alcohol. If it gets dirty, wipe lightly with a soft clothmoistened with a small amount of water.
2. The main unit is not resistant to heat. Do not place it near a source of highheat.
3. Do not store the instrument in a place where it may be subjected toexcessive vibrations or from where it may fall.
4. For storing the instrument, avoid hot, cold or humid places or placed
under direct sunlight or where condensation is anticipated.
5. When the instrument is not to be used for a long period, be sure to
remove batteries from it.

6-4 Battery and fuse replacement
WARNING

Fuse

5-5 AC current measurement/DC current measurement (ACmA/DCmA)WARNING
1. Never apply voltage to the input terminals.
2. Do not apply an input exceeding the maximum rated current to the input
terminals.
3. Be sure to connect the meter in a series connection via the load.
Power source
LoadPower source① Using a Phillips screwdriver, turnthe battery lid retaining screw(x1) until it becomes loose.
② Press the position marked PUSH
to lift the battery lid, and thenremove it.
③ Replace the batteries by taking
care of the polarity. Alternatively,
replace the fuse if required.
④ Attach the battery lid and tighten
the retaining screw.

[7] AFTER-SALE SERVICE

Incorrect measurement

Load

Coverage

Range

ACmA

0.00 - 600.0 mA

60.00/600.0 mA

DCmA

0.00 - 600.0 mA

60.00/600.0 mA

Input resistance: About 1 Ω (excluding fuse resistance). ACmA accuracyassured frequencies: 45 Hz to 1 kHz.

− 5 −When the SELECT button is held depressed (for more than 2 sec.), the backlightof the LCD turns on. Holding the same button depressed again turns it off. The
backlight also turns of automatically in about 30 seconds.

4-6 Range Hold : RANGE button

5-2 AC voltage measurement (ACV), frequency measurement (Hz)Display

Coverage

RangesACV
Hz

0.005 ～ 600.0
10.00 ～ 99.99 k

6.000/60.00/600.0 V
99.99/999.9/9.999 k/99.99 kHz

The accuracy-assured frequencies of the ACV measurement are 45 Hz to 500
Hz (sine wave AC).
Hz input sensitivity : 10.00 to 9.999 kHz: ≥1 Vrms. 10.00 kHz or more: ≥5 Vrms.

Press the RANGE button momentary to set the manual range mode (AUTO
disappears in the display). In manual range mode, press the button again to step
through the ranges. To return to the auto mode, press and hold the button for 1
sec. or more (then ‘AUTO’ is shown).
Manual range hold mode is not available in the Hz, , and functions.

When the △ REL button is held depressed, the meter enters the MAX/MIN
mode, in which the measurement range is fixed and the Auto Power Save andRelative value measurement functions are canceled.
• Every time the SELECT button is pressed, the displayed information changes
as follows : Current measurement display (MAX MIN displayed) → MAX value
display (MAX displayed) → MIN value display (MIN displayed) → Current
measurement display (MAX MIN displayed) → …
• Current measurement display : The meter stores the maximum and minimum
values while displaying the current measurement value. The buzzer beeps
every time a value is updated. The maximum and minimum values can bechecked by pressing the button to view the MAX value display and MIN value
display. To cancel the MAX/MIN mode, press the button for 1 sec. or more.
• MAX value display : Maximum value measured since the entry in MAX/MIN
mode.
• MIN value display : Minimum value measured since the entry in MAX/MIN
mode.
The MAX/MIN mode can also be entered when the relative value measurement
function is active ( △ displayed). In this case, the MAX/MIN mode displays therelative values assuming that the value at the moment the button is pressed is 0(reference value).
MAX/MIN memory mode is not available in the Hz, , and functions.
* The MAX/MIN mode is canceled when the function or range is switched.

When the HOLD button is pressed, the current display is hold (appears
on the display). The display will not be changed even when the input varies
thereafter. Press the button again to cancel the Data Hold mode (on thedisplay disappears).
* The Data Hold mode is also canceled when the function switch is switched or
the RANGE or SELECT button is pressed.

Set the function switch to ACV.
Each press of the SELECT buttonalternates ACV and Hz.
While selecting ACV, appears on thedisplay when a voltage of 20 V or moreis input.
At the moment the input exceeds 20 V,
the buzzer beeps and the backlight
flashes to indicate it.

5-3 DC voltage measurement (DCV)
Display

Coverage

RangesDCV

0.0 m ～ 600.0

600.0 m/6.000/60.00/600.0 V

Set the function switch to DCV.
appears on the display when avoltage of 20 V or more is input.
At the moment the input exceeds 20 V,
the buzzer beeps and the backlight
flashes to indicate it.

5-4 Resistance ( ), diode () , capacitance ()), continuity (.
Set the function switch to
Each press of the SELECT button switches the function in order of
→ → …

→

WARNING• Never apply voltage to the input terminals.

5-4-1 Resistance measurement (Coverage

Ranges

0.0 ～ 60.00 MΩ

600.0/6.000 k/60.00 k/600.0 k/6.000 M/60.00 MΩ

The open voltage across the measurement terminals is about DC 1.2 V.
If measurement is likely to be
influenced by noise, shield the object
to measure with negative potential(COM). If a finger touches a test pin
during measurement, measurement
will be influenced by the resistance inthe human body, and that results inmeasurement error.

When the meter is switched on while holding the △ REL button displayed, thedisplay showsfor 2 seconds and the buzzer beep is canceled. Even when
the buzzer is canceled, it still beeps in the case of OL alarm, in the continuity
check, when the meter is turned on and before Auto Power Save. To enable allof the buzzer sounds, turn the meter off then on again.
* This mode cannot be used when the Auto Power Save function is canceled.

7-1 Warranty and provision
Sanwa offers comprehensive warranty services to its end-users and to its
product resellers. Under Sanwa's general warranty policy, each instrument iswarranted to be free from defects in workmanship or material under normal use
for the period of one (1) year from the date of purchase.
This warranty policy is valid within the country of purchase only, and applied
only to the product purchased from Sanwa authorized agent or distributor.
Sanwa reserves the right to inspect all warranty claims to determine the extent
to which the warranty policy shall apply. This warranty shall not apply to fuses,
disposables batteries, or any product or parts, which have been subject to oneof the following causes:
1. A failure due to improper handling or use that deviates from the instruction
manual.
2. A failure due to inadequate repair or modification by people other than Sanwa
service personnel.
3. A failure due to causes not attributable to this product such as fire, flood andother natural disaster.
4. Non-operation due to a discharged battery.
5. A failure or damage due to transportation, relocation or dropping after thepurchase.
− 6 −Customers are asked to provide the following information when requesting
services:
1. Customer name, address, and contact information
2. Description of problem
3. Description of product configuration
4. Model Number
5. Product Serial Number
6. Proof of Date-of-Purchase
7. Where you purchased the productPlease contact Sanwa authorized agent / distributor / service provider, listed in
our website, in your country with above information. An instrument sent to
Sanwa / agent / distributor without those information will be returned to thecustomer.
Note:1) Prior to requesting repair, please check the following:• Capacity of the built-in batteries and polarity of installation.
• Discontinuity of the test leads.
• Functioning of the fuse (if it is now blown).
2) Repair during the warranty period:
The failed meter will be repaired in accordance with the conditions stipulated
in 7-1, Warranty and provision.
3) Repair after the warranty period has expired:• When the original functionality is expected to be restored by repair, we will
repair the product upon request and payment by the customer.
• In some cases, repair and transportation cost may become higher than theprice of the product. Please contact Sanwa authorized agent/service provider
in advance.
• The minimum retention period of service functional parts is six (6) years after
the discontinuation of manufacture. This retention period is the repair
warranty period. Please note, however, if such functional parts become
unavailable for reasons of discontinuation of manufacture, etc., the retention
period may become shorter accordingly.
4) Precautions when sending the product to be repaired• To ensure the safety of the product during transportation, place the product ina box that is larger than the product 5 times or more in volume and fillcushion materials fully.
• Clearly mark “Repair Product Enclosed” on the box surface.
• The cost of sending and returning the product shall be borne by the customer.

− 4 −Safety standards

IEC61010-1, IEC61010-2-030, IEC61010-2-33, IEC61010-31
CAT.IV 300 V / CAT.III 600 V

EMC Directive, RoHS
Directive

IEC61326 (EMC), EN50581 (RoHS)

Accessories

Instruction manual, “AAA”-size alkaline battery x 2, hand strap

8-2 Optional accessory
Hanger magnet: HM-1

8-3 Measurement ranges and accuracies
Accuracy-assured temperature/humidity ranges: 23±5 ºC, ≤ 80 %RH, nocondensation.
rdg: reading.
dgt: digits (lowest digits)
As the ACV and ACmA measurements employ the rms value response, theaccuracy-assured ranges and crest factor become as follows.
Accuracy range: 1 % to 100 % of measurement range.
Crest factor CF: Full scale CF < 1.8, half scale CF < 3.6.
Function
AC voltage
ACV

Range

Accuracy

Remarks

6.000 V± (1.2 %rdg+9 dgt)

Input resistance: About 10 MΩ
• Accuracy-assured
frequencies: 45 Hz – 500 Hz

60.00 V
600.0 V± (1.2 %rdg+5 dgt)

99.99 kHz

Input resistance: About 10 MΩ
• Accuracy not assured below
10 Hz.
• Sensitivity 10 Hz: ≥ 1 Vrms
10 kHz: ≥5 Vrms

600.0 mV

Input resistance: About 10 MΩ

99.99 Hz
FrequencyHz

DC voltage
DCV

999.9 Hz9.999 kHz

6.000 V
60.00 V± (0.5 %rdg+3 dgt)

± (0.8 %rdg+3 dgt)

600.0 V
600.0 Ω6.000 kΩResistance

60.00 kΩ± (1.2 %rdg+5 dgt)

600.0 kΩ

7-3 SANWA web site
http://www.sanwa-meter.co.jp
E-mail: exp_sales@sanwa-meter.co.jp)

ΩResistor

7-2 Repair

6.000 MΩ± (2.0 %rdg+ 5 dgt)

60.00 MΩ± (4.0 %rdg+ 5 dgt)

Open voltage: About DC 1.0 V
Buzzer beep generated at 10 to50 Ω or less.

Continuity check△ - Σ method

60.00 nF
600.0 nF

AC detection method

True RMS method (AC coupling)

Display

Max. 6000 counts

60.00 μF

Sampling rate

Max. approx. 5 times/sec.

600.0 μF

Over load indication“ OL” mark indication on digital display

Range selection

Auto and Manual

Polarity switching

Auto (“-” indicated when negative voltage is input)

Low battery indication

mark displayed when battery voltage drops at 2.3 V or less.

Operating environmental
conditions

Altitude ≤2000 m, indoor use, pollution degree II

Operating temperature/humidity ranges-10 ºC to 40 ºC.
Humidity range is as follows (without condensation):Max. 80 %RH at 5 ºC to 31 ºC, decreasing linearly to 50 %RH at
40 ºC.

Storage temperature/humidity range-20 ºC to 40 ºC: ≤80 %RH (without condensation).
40 ºC to 50 ºC: ≤70 %RH (without condensation).
(Batteries should be removed when the instrument is not to be
used for a long period.)

Temperature coefficient

Below 18 ºC and above 28 ºC: Accuracy x 0.15 should be addedfunction.)
per ºC. (Accuracy x 0.25 should be added in thePower supply

LR03 (“AAA”-size alkaline battery)1.5 V × 2

Auto Power Save

Power Save in about 15 minutes after last operation. Typ. 20 µA

Current drain

About 1.5 mA (backlight off). max. about 38 mA

Battery life

About 600 hours (backlight off)Fuse

600 mA/600 V, φ 6.3 x 32 mm
Breaking capacity 10 kA (ceramic tube fuse)(part number : F0325）

Dimensions & mass

166 (H) x 100 (W) x 43 (D) mm, about 360 grams (incl. batteries)

Test lead length

About 0.8 m− 7 −CapacitanceAC current
ACmA

DC current
DCmA• Open voltage: About DC 1.8 V• Measurement current varies
depending on the resistancevalue of the object measured.

Open voltage: About DC 3.2 V“OL” displayed at 3.000 V or
more.

Diode test

8-1 General specifications
Operation method→

Display

4-10 Disable Buzzer[8] SPECIFICATIONS

1.If the rear case or the battery lid is removed with input applied to the input
terminals, you may get electrical shock. Before starting the work, always
make sure that no input is applied.
2.Before starting the work, be sure to turn OFF the main unit power andrelease the test leads from the circuit.
3. Be sure to use a fuse of the specified rating or type. Never use a substituteof the fuse or never make a short circuit of the fuse.
Batteries

Correct measurement

4-5 Backlight : SELECT ( ) button

Check the following items before starting the daily measurement work.
• Appearance check : Check the appearance of the meter to see if it is freefrom damage caused by falling, etc.
• Accessory : Check that the test leads are free from irregularities such as
wire disconnection and crack.
• Battery: Install the battery before using the meter for the first time. Ensure
low battery indication is not displayed and, if it is displayed,that thereplace the battery with new one. If nothing is displayed, the battery may be
exhausted totally (see 6-4).
• Test lead wire disconnection can be checked by setting the function switch
to and shorting the test pins.
• Also check that the meter and your hands are not moistened by water, etc.

− 3 −1. This section is very important for safety. Read and understand thefollowing instruction fully and maintain your instrument properly.
2. The instrument must be calibrated and inspected at least once a year tomaintain the safety and accuracy.

Anode

Example of Good item:
Forward voltage
drop display
Example of NG item:
0.000 V display,“OL” display

Display

When the SELECT button is pressed, the functions change as follows.
ACV position : ACV → Hz → ACV → …
position : → → → → → …
mA position : AC mA → DC mA → AC mA → …

5-1 Start-up inspection

Insert the hand strap into the strap hole asshown in the figure.

WARNING

5-4-4 Capacitance measurement (4-4 Measurement function selection : SELECT button

4-9 Data Hold : HOLD button

Set the function switch to mA.
Each press of the SELECT button alternates ACmA and DCmA.

Diode

Display

4-3 Low battery indication

− 2 −

)

5-4-3 Continuity check (The Auto Power Save function turns the display off automatically in about 15
minutes after the last operation or after an input of 20 V or higher was applied tosave the power consumption. To return from this status, press the SELECT or
RANGE button or turn the power switch to OFF then to another position.
To disable the Auto Power Save function, switch the meter on by turning thefunction switch while holding the SELECT button depressed. A short buzzer
beep is generated, “” is displayed for 2 seconds, and theindicator
disappears.
* A small current flows inside the meter even in the Auto Power Save status.
After measurement, always turn the function switch to the OFF position.

4-8 MAX/MIN memory : △ REL (MAX/MIN) button

Strap hole

− 1 −5-4-2 Diode test (4-2 Auto Power SaveWARNING
1. Never apply an input signal exceeding the maximum rating input value ofeach function.
2. Be sure to disconnect the test pins from the circuit when changing the function.
3. Always keep your fingers behind the finger guards on the probe when
making measurements.
4. After measurement, release the red and black test pins from the object
measured and set the function switch to the OFF position.

When the △ REL button is pressed, △ appears on the display, the measuring
range is fixed and the display shows the relative values assuming that the value
at the moment the button is pressed is 0 (reference value). When the button ispressed again, △ disappears and the relative value measurement is canceled.
Relative value measurement mode is not available in the Hz,
andfunctions.

1-1 Explanation of Warning Symbols

WARNINGTo ensure the instrument is used safely, be sure to observe the instruction
when using the instrument.
1.This instrument is a digital multimeter for metering low voltages. Neveruse it on electric circuits that exceed CAT.IV 300 V or CAT.III 600 V.
2.Pay special attention when measuring the voltage of AC 33 Vrms (46.7 Vpeak) or DC 70 V or more to avoid injury.
3.Never apply an input signal exceeding the maximum rating input value (see 1-3).
4.Never use the meter for measuring the line connected with equipment (i.e.
motors) that generates induced or surge voltage since it may exceed the
maximum allowable voltage.
5.Never use meter if the meter or test leads are damaged or broken.
6.Never use uncased meter or the meter without the lid.
7.Always keep your fingers behind the finger guards on the probe when
making measurements.
8.Be sure to disconnect the test pins from the circuit when changing the function.
9.Before starting measurement, make sure that the function and range areproperly set in accordance with the measurement.
10.Never use meter with wet hands or in a damp environment.
11.Never open tester case except when replacing batteries or fuse.
Do not attempt any alteration of original specifications.
12.To ensure safety and maintain accuracy, check the meter in the start-up inspection
as well as in the inspection/calibration to be performed at least once a year.
13.The meter is for indoor use only.
14.Wear insulating protective gear when using the meter with equipment containing a
hazardous live part. Also be sure to observe your local and national safety rules.
15.Always use the meter in a specified method to prevent the protectivefunction from being imperiled.

Turn this switch to turn on and off the power and to switch the measuringfunctions.

[5] MEASUREMENT PROCEDURE

4-7 Relative value measurement : △ REL button

together with the product for reference to it when necessary.
If you use the product in a method not specified in this manual, the protection
function of the product may be imperiled.
The instruction given under the heading of “ WARNING” and “ CAUTION” must be
followed to prevent accidental burn or electrical shock.

1-2 Warning Instructions for Safe Use

4-1 Power/Function switch

When the batteries are exhausted until the supply voltage drops below about
2.3 V, theindicator lights on the display. Replace the batteries when thisindicator appears.

[2] APPLICATIONS AND FEATURES
This instrument is a digital multimeter with rms value response, designed formeasurements within the range specified as CAT.IV 300 V / CAT.III 600 V in
IEC61010.

INSTRUCTION MANUAL[4] DESCRIPTION OF FUNCTIONS± (3.0 %rdg+10 dgt)

6.000 μF
± (5.0 %rdg+10 dgt)

60.00 mA
600.0 mA
60.00 mA
600.0 mA

± (1.6 %rdg+5 dgt)

± (1.2 %rdg+5 dgt)

Auto range only.
Accuracy with a capacitor withlow leak current such as a film
capacitor or equivalent.
Less than 10 nF add +15 dgt tothe accuracy.
Input resistance: About 1 Ω(excluding fuse resistance)
Accuracy-assured frequencies:
45 Hz to 1 kHz
Input resistance: About 1 Ω(excluding fuse resistance)

Accuracy calculation method

Example) AC voltage measurement (ACV)
Displayed value: 100.0 V
Range accuracy: 600.0 V range ± (1.2 %rdg + 5 dgt) added to accuracy above.
Error: ±(100.0 V x 1.2 %rdg + 5 dgt) = ±1.7 V
True value: 100.0 V ±1.7 V (between 98.3 - 101.7 V)* In the 600.0 V range, 5 dgt corresponds to 0.5 V.
Specifications and external appearance of the product describedabove may be revised for modification without prior notice.

− 8 −