HG561H
DIGITAL INSULATION RESISTANCE TESTERINSTRUCTION MANUAL

[5] MEASURING PROCEDURE

Table of Contents[1] SAFETY PRECAUTIONS*Before use, read the following safety precautions.
1-1 Explanation of Warning Symbols………………… 1
1-2 Warning Instructions for Safe Use………………… 1
1-3 Overload Protection………………………………… 2[2] APPLICATIONS AND FEATURES
2-1
2-2

Applications………………………………………… 3
Features……………………………………………… 4[3] PARTS IDENTIFICATION
3-1
3-2
3-3

Body…………………………………………………… 5
Measurement Probe, Alligator Clip………………… 6
Display………………………………………………… 6[4] DESCRIPTION OF FUNCTIONS
4-1

Changing the Angle of the Measurement Probe…… 7

4-2

Power Button…………………………………… 7

4-3

Light Button……………………………………… 7

4-4

Button Automatic Locking Feature………………… 8

4-5

Test Voltage Selection/Hold Button

4-6

Function Selection Button

4-7

MΩ test button

4-8
4-9

Auto Power Off ……………………………………… 9
Low Battery Indication……………………………… 9…………… 8……………………… 8(MΩ function)………………… 9

5-1
5-2
5-3
5-4
5-5

Pre-operational Check……………………………… 10
Voltage Measurement……………………………… 11
Insulation Resistance Measurement……………… 13
Discharge Function………………………………… 18
Resistance (Ω) Measurement, Continuity Check…… 18[6] MAINTENANCE
6-1
6-2
6-3
6-4

Simple Examination………………………………… 20
Calibration…………………………………………… 20
Battery Replacement………………………………… 20
Storage……………………………………………… 21[7] AFTER-SALE SERVICE
7-1
7-2
7-3

Warranty and Provision……………………………… 22
Repair………………………………………………… 22
SANWA web site…………………………………… 23[8] SPECIFICATIONS
8-1
8-2

General Specifications……………………………… 24
Measuring Range and Accuracy…………………… 25

[1] SAFETY PRECAUTIONS*Before use, read the following safety precautions.
This instruction manual explains how to use your digital
insulation resistance tester HG561H. Before using, readthrough this manual to reduce the risk of fire , electric
shock, and/or injury. And save it together with the productso that you can refer to the manual as necessary.
The instructions given under the headings of "WARNING"
must be followed to prevent accidental burn and electric
shock and "CAUTION" as well.
1-1 Explanation of Warning Symbols
The meanings of the symbols used in this manual andattached to the product are as follows.
: Extremely-important instructions for safe use• WARNING identifies conditions and actions that
could result in accidental burn and electric shock.
• CAUTION identifies conditions and actions that
could cause damage the instrument.
Description of the symbols used in this instrument: Refer to the Instruction Manual before use: Direct Current (DC): Ground: Alternating Current (AC) Ω: Resistance: POWER button		: Backlight: Continuity: Double Insulation or Reinforced insulation
1-2 Warning Instructions for Safe Use

WARNING
The following instructions are intended to prevent injury such as
burn and electric shock. These instructions must be followed.
1. Do not use the instrument if the body, the measurement probe,
the alligator clip, or the earth lead look damaged.
2. Do not apply higher voltage than the max. ratings by eachfunction. (See 1-3)
3. Use caution when working with voltages above 33 V ac rms,

－1－

46.7 V ac peak, or 70 V dc. These voltages pose a shock hazard.
4. Do not use the instrument to measure lines that may haveinductive voltage or surge voltage (e.g. motors) because the input
voltage may exceed the maximum rated voltage.
5. Do not use the instrument in places where explosive gas or
corrosive gas is generated.
6. Never operate the instrument with the case or battery door removed.
7. Never attempt to repair or modify the instrument, except forbattery replacement.
8. Use the specified type of the measurement probe and the alligatorclip.
9. Do not hold a test pin side of the barrier of the measurement
probe or an alligator clip side of the barrier of the alligator clip
lead, while the measurement.
10. Connect the earth lead (the alligator clip) first, then connect thevoltage source (the measurement probe). Disconnect the voltage
source lead first after the measurement.
11. Make sure the function is properly set while the measurement.
12. Do not switch the function to another function while themeasurement.
13. Do not operate the instrument when it is wet or with wet hands.
14. Use the instrument according to the "how to use" described in this
instruction manual without exception.
15. Make sure that a pre-operational check is performed and an
inspection is performed at least once a year.
16. Do not use the instrument outdoors.
17. Do not use the instrument in an area where explosive gas or
corrosive gas is generated.

CAUTION
Incorrect measurement may be performed in aferromagnetic or intense electric field near transformers,
high-current circuits, or radio equipments, or in a circuitwith a large amount of harmonic.
1-3 Overload Protection
FunctionV
MΩ

Max. Rated Input
Overload Protection
600 V dc/ac
660 V dc/ac rms
660 V dc/ac rms
Do not apply any
600 V dc/ac rms
voltage.

－2－[2] APPLICATIONS AND FEATURES
2-1 Applications
This instrument is a DC insulation resistance tester
designed to measure insulation resistance of electric lines
and electric equipments in the range of the CAT. III 300 V
and CAT. II 600 V.
●
categories (overvoltage categories)●Measurement
The IEC (International Electrotechnical Commission)
standard categorizes measuring circuits for safe useof measuring instruments in low-voltage facilities. The
categorization includes II, III, and IV. Higher numberof the category corresponds to the place with higher
transient energy. For safe measurement, wear insulating
gloves, dust-proof glasses and so on in the place ofCAT. III.

Interior wiring

Service entrance
Service wire

Distribution board
CAT .Ⅲ

CAT .Ⅳ

CAT .Ⅱ

Wall socket

Integrating wattmeter
Wall socket

Voltages used in the measurement categories are basedon line-to-neutral voltage. The secondary side of 480 V
of Three-phase four-wire systems with earthed neutral or
Three-phase three-wire systems unearthed is categorized
into CAT. III 300 V.

●
category II (CAT. II)●Measurement
Applicable to measurements on circuits directly
connected to utilization points of the low-voltage mains
installation.
Applicable to measurements on household appliances,
portable tools, and similar equipment.

2-2 Features• Safety design that conforms to the IEC61010/IEC61557• Though it is pocket size, when measuring MΩ, the rated
current is more than 1 mA.
• Provides 7 test voltages (15/25/50/100/125/250/500 V),
and any voltage can be selected and fixed. The feature
prevents you from mistakenly selecting 500 V.
• Automatically-held readings after measuring MΩ
The LED level meter shows the reading.
• Easy-to-read LCD with the fixed decimal point• The lighting lamp illuminates a place to be measured,and the LCD has a backlight.
• All-in-one body with the probe enables you to easily
watch the tip of the probe and the display at once.
• Provides the probe that enables you to measure througha hole of a circuit breaker cover.
• Auto Power Off feature (approx. 10 min.)• Auto-discharge feature• When the probe is applied to the object which is a livewire (over 30 V) before pressing the test button in theMΩ function, the instrument automatically detects it
and displays the voltage, and will not generate any test
voltage.

－3－

－4－

●
category IV (CAT. IV)●Measurement
Applicable to measurements performed at the source ofthe low-voltage mains installation.
Applicable to measurements performed in the buildingssuch as electric measurements on the ripple control units
and transient overcurrent protection devices.
●
category III (CAT. III)
●Measurement
Applicable to measurements performed at the lowvoltage mains installation in the buildings.
Applicable to measurements on distribution boards,
circuit-breakers, wiring including cables, bus-bars,
junction boxes, switches, socket-outlets in the fixedinstallation, and equipment for industrial use andsome other equipment such as stationary motors withpermanent connection to the fixed installation.

[3] PARTS IDENTIFICATION

3-2 Measurement Probe, Alligator Clip
Barrier

3-1 Body
LED light

LED level meter (MΩ)

Detachable variable angle
measurement probe
Alligator clip (CL-561)
Connector

Display

Barrier

Power button

Light button

MΩ Test button

Detachable alligator clip

Measurement probe (TL-561)

3-3 Display①

Function selection button

Test voltage selection/Hold button

Hand strap eyelet②⑪

Front View⑩
Earth lead
take-up reel

⑨

⑧

⑦

⑥

④ ③
⑤

Earth lead
stopper

Battery door

Alligator clip
holderBack View

－5－

①
②
③
④
⑤
⑥
⑦
⑧
⑨
⑩
⑪

Test voltage
Numerical display part
Continuity beeper
Unit of insulation resistance function
Unit of resistance and continuity function
Unit of voltage function
Data Hold indicator
Button Locking indicator
Low battery indicator
Polarity AC/DC/Voltage warning indicator－6－[4] DESCRIPTION OF FUNCTIONS
4-1 Changing the Angle of the Measurement Probe
To change the angle of the measurement probe, pull the probeout from the body and set the angle, then insert the probe
again. Make sure that the measurement probe has been
properly fitted into the body.

4-4 Button Automatic Locking Feature
Approx. 15 sec. after the last button operation, the button
automatic locking feature will be activated with the beepsound. (indicator turns on.)  While the feature is
activated, the following buttons are disabled.
• Insulation resistance measurement function:
Test voltage selection button and Function selection button• Voltage measurement function and Resistance measurement function:
Function selection button
To release the locked button, press the function selection
indicator turns off.)
button and hold for 1 sec. or more. (The locked button cannot be released while the MΩ button
is pressed.

A button is locked.

The button is unlocked.

Press the hold button or function selection button and hold it 1 sec. or more.

4-2 Power Button
When OFF, pressing the power button for 1 sec. or moreturns on the instrument. When ON, pressing the power
button for 1 sec. or more turns it off. All segments of thedisplay, LED level meter, LCD backlight, and the LED lightwill be turned on for approx. 1 sec. after power-on, andthen the instrument will be ready to use.
4-3 Light Button
Press the light button to turn on the LCD backlight and the
LED light on the top of the body. Press the button again toturn them off.

4-5 Test Voltage Selection/Hold Button• Test voltage selection (MΩ function)
Press the button to arbitrarily select a voltage from thevoltages indicated on the display.
• Data hold (V or Ω function)
Press the button to freeze present reading for later view.
indicator turns on.) Input fluctuation will not reflect(
on the indicated value. Press the data hold button again
to disable the data hold feature and go back to thenormal measurement mode. (indicator turns off.)
4-6 Function Selection Button
Press the button to switch the function. Press the button tosequentially switch the function as V → MΩ → → V →….

－7－

－8－

4-7 MΩ test button(MΩ function)
Press the top of the button to generate a test voltage
just while the button is pressed. To make continuous
measurement, set the button up.
To stop the measurement, release the button or lay it down
again. The last reading on the display and the LED level
meter will be held.
The reading will be held until the next measurement andthe LED level meter will be turned off approx. 5 sec. later.

[5] MEASURING PROCEDUREWARNING
1. Do not apply any input signal exceeding the max.
rated value for each function.
2. Do not switch the function while measuring.
3. Do not hold the tip side of the barrier of themeasurement probe or the tip side of the barrier of
the alligator clip while measuring.
5-1 Pre-operational CheckWARNING
Do not use the instrument if the body, the measurement
probe, the alligator clip, or the earth lead look damaged.

CAUTION
Set the MΩ test button up.

Press the MΩ test button.

Note:
If the MΩ test button is set ON when the power is turned
will be shown on the display and the beeperon,sounds. To make the instrument ready to use, release andlay down the test button again.
4-8 Auto Power Off
Approx. 10 min. after the last button operation, thebeeper sounds (10 times) and the power will be turned off
automatically.
4-9 Low Battery Indication
Decreasing the internal battery voltage to below approx.
4.0 V (4.3 V when 500 V is selected as a test voltage) dueon the display. Replace all 4
to wearing out turns on
batteries with new ones when the indicator turns on.
Note:
Decreasing the internal battery voltage to a voltage thatthe instrument does not work due to wearing out indicateson the numeric part of the display.

－9－

Make sure the low battery indicator is off after power-on.
Replace the battery with new ones (all 4 pieces) if theindicator is on.
* In the case nothing is displayed, the batteries may becompletely worn out.
Inspection of the display
All segments of the display, LCD backlight and all LEDs will
be turned on for approx. 1 sec. after power-on. Check fordisplay defects.
Inspection of disconnection
function, and make sure the beeper sounds when
Set tothe measurement probe is connected to the alligator clip.

－ 10 －

3) Measuring procedure① Set the V function.
② Connect the alligator clip to the circuit to be measured
and the measurement probe too.
③ Read the display.

②

②

②

③

①

5-2 Voltage Measurement
AC voltage (ACV), DC voltage (DCV) Automatic detection③③

WARNING
Do not apply any input signal exceeding the max. rated
input voltage.

①

V

①

V

1) What to measure
ACV: Sine wave voltages such as output from a wall socket,
output from a low-frequency amplifier, and etc.
DC V: Batteries, DC circuit voltages, and etc.
2) Measuring ranges
Measuringrange
ACV 600.0 V

Function

DCV 600.0 V

Accuracy

Remarks±(1.6 %rdg + 7 dgt)

Over 600 V: Beeps
Over 610 V: "OL" displayed－ 11 －Note:
ACV or DCV will be automatically selected.
Voltage exceeding 30 V ac/dc turns onon the display
and makes periodic beep.

－ 12 －

5-3 Insulation Resistance Measurement

WARNING
1. Do not apply any voltage to the measuring terminals.
2. Disconnect the power supply from the circuit to bemeasured and make sure any voltage does not remain
on it, then make the measurement.
3. Do not touch the circuit to be measured while measuring
as the instrument generates high voltage for themeasurement.
4. Pay attention not to get shocked as the instrument andthe circuit to be measured are charged with high voltage.
5. Discharge the high voltage charged to the circuit to bemeasured to prevent the risk of electric shock. (See thesection 5-4.)

Test voltage selection mode
The instrument makes only necessary voltages enabled
between 15 V, 25 V, 50 V, 100 V, 125 V, 250 V, and 500 V.
Only the selected test voltages can be used after thesetting. For instance, after you make 50 V, 125 V, and 250 V
enabled, only those 3 voltages can be used. (The indication
15V, 25V, 100V, and 500V will be turned off.)
To re-select test voltages you need, enable the voltages inthe test voltage selection mode again.
How to sellect a test voltage

CAUTION
1. High voltage is generated on the measuring terminals
It is recommended that you make the insulation resistancemeasurement with any low or unknown withstanding
voltage equipments or parts (semiconductors, etc.)
disconnected from the circuit for breakage prevention.
Pay special attention to computer-related equipments.
2. Make a measurement with a test voltage that is close to
the working voltage of the circuit to be measured.
3. It may take longer time to measure insulation resistancewhen the circuit to be measured has a capacitancecomponent.
4. Generally, connect the alligator clip to the earth side
(Ground) and the measurement probe to the circuit side
(LINE) when the circuit to be measured is grounded. (Thisconnection way shows generally lower value than theother connection.)
5. The earth lead connected to the LINE side should nottouch the circuit to be measured or the earth in order toprevent measurement error.
6. Insulation resistance changes a lot depending on
temperature and humidity. Also it changes dependingon the applied voltage (Test voltage). Generally higher
temperature, higher humidity, or higher test voltage shows
lower insulation resistance.
7. Oscillation noise during the measurement is not due tofailure.

Test voltage selection mode
The fig. shows 15 V rage is selected.

Press both buttons
and hold 1 sec. or morewhen the power is off.

25 V range is selected.

25 V range will be removed.

Press 1 sec.
or more.
To add the 25 V range
on the instrument,press the test button again.
Test voltage selection completed.

To be ready to measure.

－ 13 －－ 14 －

Note:
If the power is turned off during the test voltage selectionmode, the selected voltages before the time will not be
is indicatedreflected. The selection completes afteron the display.
The selected test voltages are memorized into the
instrument, and only the selected voltages can be used
when the power is turned on again after being turned off.

Example of insulation resistance measurement

FOF

1) What to measure
MΩ: Insulation resistance of low-voltage electric equipment
and equipment items.
2) Measuring ranges (Automatic range selection)
Test voltage
15 V
25 V
50 V
100 V
125 V
250 V
500 V

Measuringrange

Accuracy

Over 21.1 MΩ:"OL" displayed

9.99 MΩ
21.0 MΩ
9.99 MΩ
99.9 MΩ110. MΩ

Remarks

How to read the LED level meter when the test voltage is
100 V, 125 V, 250 V, or 500 V.
Reading

LED level meter

0.49 MΩ or under±(2 %rdg + 5 dgt)
Over 111 MΩ:"OL" displayed

0.50 MΩ ～ 0.99 MΩ
1.00 MΩ ～ 4.99 MΩ

3) Measuring procedure① Set the MΩ function.
② Set a test voltage.
③ Connect the alligator clip to the circuit to be measured
and the measurement probe too.
④ Press the test button.
⑤ Read the display or the LED level meter.
Note:
Make sure the test voltages you need are enabled. If thevoltages are not shown on the display, make the voltages
enabled in the test voltage selection mode again.
The instrument displays up to 3 digits with fixed decimal point.

－ 15 －

5.00 MΩ ～ 9.99 MΩ
10.0 MΩ ～ 19.9 MΩ
20.0 MΩ ～ 49.9 MΩ
50.0 MΩ ～ 99.9 MΩ
100. MΩ ～ 110. MΩ
111. MΩ or over－ 16 －

How to read the LED level meter when the test voltage is
15 V, 25 V, or 50 V.
Reading

LED level meter

0.49 MΩ or under
0.50 MΩ ～ 0.99 MΩ
1.00 MΩ ～ 4.99 MΩ
5.00 MΩ ～ 9.99 MΩ
10.0 MΩ ～ 19.9 MΩ
20.0 MΩ or over

After the measurement, the instrument holds the lastreading on the display, and starts the automatic discharge.
When a voltage of the circuit to be measured decreases to30 V or lower, on the display will be turned off. (Refer to"5-4 Discharge Function".)* Insulation resistance measurement principle:
Detecting a current flowing through the circuit to bemeasured being applied a DC voltage, the insulation
resistance is calculated from "the voltage / the current".
5-4 Discharge Function
Measuring a capacitive circuit to be measured will charge
it with a rated test voltage. This function discharges theremaining high voltage from the circuit to be measured toprevent from electric shock.

When the circuit to be measured is in a hot line condition( ≧ 30 V ac/dc), the voltage and will be indicated on
the display and the beep sounds. Under the condition,even if the MΩ test button gets pressed, the instrument
will not generate any test voltage. Turn off the circuit to bemeasured, and then measure again.

1. Keep the measurement probe and the alligator clip
connected to the circuit to be measured, and turn off
the MΩ measurement switch after the MΩ measurement
finished.
2. The instrument automatically starts the discharge.
on the display means "still under discharging". Whenthe discharge finishes or a voltage of the circuit to bemeasured gets to 30 V or less, gets turned off.

• The LED level meter works synchronizing with the reading on
the display. (* Refer to "How to read the LED level meter".)• A voltage between 5 Vac and 30 Vac (Ghost voltage etc.) on
the circuit to be measured makes the "AC" on the display
blink. Unstable reading may be shown during the insulation
resistance measurement under the condition.

5-5 Resistance (Ω) Measurement, Continuity Check

A ghost voltage makes “AC” blinkand the reading may be unstable.

－ 17 －WARNING
Do not apply any voltage to the measuring terminals.

1) What to measure
Resistance: Resistor, circuit resistance, etc.
Continuity check: Wiring connections, Operation ofswitches, etc.

－ 18 －

[6] MAINTENANCE

2) Measuring ranges
Measuring
range

Function

Accuracy

Remarks

WARNING

Resistance≦ 30 Ω: Beeps
999.9 Ωmeasurement
9.999 kΩ:99.99 kΩ ±(1.5 %rdg + 7 dgt)
Not supported
Continuity
999.9 kΩOver 1 MΩ: "OL"Check

1. The followings are important to safety. Read thismanual throughly to maintain the instrument.
2. Calibrate and inspect the instrument at least once a
year to ensure safety and maintain its accuracy.

function. (Ω or kΩ will be indicated.)① Set② Connect the alligator clip to the circuit to be measured
and the measurement probe too.
③ Read the display.

6-1 Simple Examination
1) Appearance:• Check that the instrument does not look damaged
caused by dropping etc.
2) Measurement Probe, Alligator Clip, Earth lead:• Check that the measurement probe and the alligator clip
fit on the instrument.
• Check for the earth lead especially exposed core wire
anywhere on it.

②②

If you find any problem on the above items, stop using
immediately and ask us to repair it.

③

6-2 Calibration
For requesting calibration and inspection, contact anauthorized agent/distribution service provider, listed in our
website. (See 7-2 section 4)

③

①

①

6-3 Battery Replacement

WARNING
1. Do not open the battery door with live input terminals
to avoid electric shock.
2. Make sure the power is OFF, before starting the
replacement.

Note:• MΩ measurement button is not available.
• Open circuit voltage between the input terminals:
Approx. 2.0 ～ 2.5 Vdc

Pre-installed battery
Since the pre-installed battery is for monitoring, it may not
be durable as typically expected.
*The purpose of the battery for monitoring is to check forthe functions and performances of the product.

－ 19 －－ 20 －

Replacement procedure① Remove the screw fixing the battery door using a slottedscrewdriver.
② Remove the battery door and replace all the 4 batteries
with new ones according to the battery mark inside thebattery holder.
③ Re-fasten the battery door screw. That is all.

6-4 Storage

CAUTION
1. The body is not resistant to volatile solvents. Do notwipe out with solvents or isopropyl alcohol. Clean the
instrument up with a dry soft cloth.
2. The body is not resistant to heat. Keep it away fromheat-generating devices such as solder irons.
3. Do not save the instrument into vibratory places orwhere the instrument may fall off.
4. Do not expose the instrument to direct sunlightand do not save it into any places with extreme
temperature, humid, or condensation.
5. Remove the battery for saving the instrument over along period of time.

[7] AFTER-SALE SERVICE
7-1 Warranty and Provision
Sanwa offers comprehensive warranty services to its endusers and to its product resellers. Under Sanwa's general
warranty policy, each instrument is warranted to be freefrom 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 disposables
batteries, or any product or parts, which have been
subject to one of the following causes:
1. A failure due to improper handling or use that deviatesfrom the instruction manual.
2. A failure due to inadequate repair or modification bypeople other than Sanwa service personnel.
3. A failure due to causes not attributable to this productsuch as fire, flood and other natural disaster.
4. Non-operation due to a discharged battery.
5. A failure or damage due to transportation, relocation or
dropping after the purchase.

Save the instrument into an appropriate place, according to
the precautions above. (Refer to the section 8-1.)

7-2 Repair
Customers are asked to provide the following information
whenrequesting 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 withabove information. An instrument sent to Sanwa / agent－ 21 －－ 22 －

/ distributor without above information will be returned tothe customer.
Note:1) Prior to requesting repair, please check thefollowing:
Capacity of the built-in battery, polarity of installationand discontinuity of the test leads.
2) Repair during the warranty period:
The failed meter will be repaired in accordance with theconditions stipulated in 7-1 Warranty and Provision.
3) Repair after the warranty period has expired:
In some cases, repair and transportation cost may
become higher than the price of the product. Pleasecontact Sanwa authorized agent / service provider inadvance.
The minimum retention period of service functionalparts is 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 e n s u r e t h e s a f e t y o f t h e p r o d u c t d u r i n gtransportation, place the product in a box that is larger
than the product 5 times or more in volume and fillcushion materials fully and then clearly mark “Repair
Product Enclosed” on the box surface. The cost ofsending and returning the product shall be borne by
the customer.
7-3 SANWA web site
http://www.sanwa-meter.co.jp
E-mail: exp_sales@sanwa-meter.co.jp[8] SPECIFICATIONS

8-1 General Specifications
Operation method
AC sensing method
LCD
Sampling rateOver-range
indication
Range selection

Delta-sigma modulation
Average detection
9.99/99.9/110 (MΩ), 610.0 (Voltage),
9999 (Resistance)
Approx. 2 times / sec.
"OL" on the numerical part and beep
The LED level meter blinks.
Automatic selection

Automatic switching ("-" will be indicatedas necessary.)
Lower than approx. 4.0 V ～ 4.3 V (depending on
the function):
indicated
Altitude: ≦ 2,000 m, Pollution degree: II,
Operating conditions Indoor use
only
Operating temperature/ 0 ℃ to 40 ℃ : 90 %RH (Max.) nonhumidity
condensing
Storage temperature/ -10 ℃ to 50 ℃ : 90 %RH (Max.) noncondensing (with battery removed)
humidity
Polarity switching
Low battery
indication

Power source

Alkaline battery 1.5 V (LR03) 4 pieces

Auto Power Off
Max. Powerconsumption
Possiblemeasurement times
Dimension, Mass

Power-off approx. 10 min. after the last operation.

Approx. 2.5 VA (when 500 V, 0.5 MΩmeasurement)
1,000 times (when 500 V, 0.5 MΩ, ON: 5
sec./ OFF: 25 sec.)
H 139 x W 91 x D 29 Approx. 230 g (with batteries)
Most significant 2 digits of the serial
Manufacturing year number on the back of the instrumentshow the lower 2 digits of the
manufacturing year (20xx).
IP Protection rating IP30 (with measurement probe)
IEC61010-1 CAT.III 300 V, II 600 V
Safety Compliances IEC61010-2-030, IEC61010-2-033
IEC61557-1 and 2, IEC61010-031
EMC, RoHS
IEC61326-1(EMC), EN50581(RoHS)
Instruction manual, Measurement probe
Accessories(TL-561), Alligator clip (CL-561), Carrying
case (C-DG3a)(The instrument usually accepts Ni-MH rechargeable batteries,
and may not work without the low battery indication caused by
the discharge characteristic of the batteries. We recommend you
have spare batteries with you just in case.)－ 23 －－ 24 －

8-2 Measuring Range and Accuracy
Accuracy: ±(% rdg + dgt)
rdg: reading
dgt: least significant digit
Temperature: 23±5 ℃
Humidity: < 75 % R.H. without condensation
External magnetic field: negligible small
Battery voltage: within the battery effective rage
Voltage: ACV, DCV
Function Range
Accuracy
Remarks
Input resistance: Approx. 10 MΩ
ACV 600.0 V±(1.6 %rdg + 7 dgt)
DCV 600.0 V
Input resistance: Approx. 10 MΩ
AC/DC automatically selectable
Accuracy-guaranteed frequency range: 40 to 400 Hz Sine wave AC
Insulation resistance MΩ
TestMediam Effective
AccuracyRangemeasuring
Remarks
voltage
value
range
15 V
Over 21.1
9.99 MΩ
0.00 ～25 V
1.0 MΩ
MΩ: "OL"
21.0 MΩ
21.0 MΩ
displayed
50 V
100 V
±(2 %rdg + 5 dgt)
Over 111
125 V 9.99 MΩ
0.00 ～
MΩ: "OL"99.9 MΩ 10.0 MΩ
110. MΩ
250 V
displayed
110. MΩ
500 V• Rated current: 1 mA (1 mA ～ 1.2 mA)• Acceptable range of open circuit voltage: Rated output
voltage X 1 ～ 1.25
• Lowest resistance to maintain the rated output voltage:
Rated output voltage X 0.001 MΩ  Ex.) 0.25 MΩ when 250 V"test voltage=rated output voltage" means a rated voltageof the output voltage. The output voltage can go down
depending on the load, if the load resistance is lower thanthe lowest resistance described above.
Ex. When measuring 0.1 MΩ with a test voltage 500 V,  theactual output voltage will be 100 V (=1 mA X 0.1 MΩ).

－ 25 －

Resistance, Continuity
Range
999.9 Ω99.99 kΩ
999.9 kΩAccuracy±(1.5 %rdg + 7 dgt)

• Open circuit voltage: Approx. 2.0 to 2.5 Vdc• ≦ 30.0 Ω: Beep sounds.
IEC61557 compatible
Measurement

Uncertainty

Voltage±(1.6 rdg% + 7 dgt)
Insulation resistance ±(2 %rdg + 5 dgt)

Operating
instrumental
uncertainty± 30 %± 30 %

This specification describes maximum values accepted by
the standard.
* variation due to changing"E1: Position, E2: supply voltage, E3: Temperature"
How to calculate accuracyEx.) AC voltage measurement (ACV)
Reading: 100.0 V
Range accuracy: ± (1.6 %rdg + 7 dgt) in the 600 V range
Measuring error: ± (100.0 V X 1.6 % + 7 dgt)= ± 2.3 V
True value: 100.0 V ± 2.3 V (from 97.7 V to 102.3 V)* 3 dgt in the 600 V range corresponds to 0.3 V.

The product specifications and its appearance describedin this manual are subject to change without prior noticefor improvement or other reasons.

－ 26 －

本社=東京都千代田区外神田2−4−4･電波ビル
郵便番号=101-0021･電話=東京（03）3253−4871㈹大阪営業所=大阪市浪速区恵美須西2−7−2
郵便番号=556-0003･電話=大阪（06）6631−7361㈹SANWA ELECTRIC INSTRUMENT CO.,LTD.

Dempa Bldg., 4-4 Sotokanda2-Chome Chiyoda-Ku,Tokyo,Japan

This manual employs soy ink.
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