Sanwa Dm508s User manual

D-1034-126DM508S/DM1008S/PDM508S英文

DM508S DM1008S

PDM508S

INSULATION RESISTANCE TESTER

INSTRUCTION MANUAL

Dempa Bldg., Sotokanda 2-Chome

Chiyoda-Ku, Tokyo, Japan

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D-1034-126DM508S/DM1008S/PDM508S英文

To ensure that the meter is used safely, follow all safety and operating

instructions.

11. Never use tester for high power or high voltage circuit.

12. Pay special attention when measuring the voltage of AC 30Vrms

(42.4V Peak) or DC 60V or more to avoid injury.

13. Disconnect power source of the measured circuit before

measuring insulation resistance.

14. High voltage is generated while measuring insulation resistance.

Be cautions of electric shock.

15. After measuring insulation to avoid electric shock. Be sure to

discharge the high voltage charged.

16. Never apply an input signal exceeding the maximum rating input

value.

17. Never use tester for measuring the line connected with

equipment (i.e. motors) that generates induced or surge voltage

since it may exceed the maximum allowable voltage.

18. Never use tester if the tester or test leads are damaged or broken.

19. Never use uncased tester.

10. Always keep your fingers behind the finger guards on the probe

when making measurements.

【1】Read First: Safety Information

We thank you for your purchasing our product, the battery-driven

insulation resistance tester.

This is a DC resistance tester developed under the principle to provide

new and unique design and function for the measurement of insulation

resistance of each kind of electric equipments. Since this tester

generates high voltage, we recommend that you read this instruction

manual thoroughly, and treat the tester correctly and safely.

The symbols used on this tester and in this instruction manual denote

the following meanings:

Be careful as the high voltage is impressed.

Be careful because there is a possibility of bodily injury or the

destruction of equipment.

WARNING

−1−

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D-1034-126DM508S/DM1008S/PDM508S英文

−2−

11. Be sure to disconnect the test pin from the circuit when changing

the function.

12. Never use tester with wet hands or in a damp environment.

13. Never use test leads other than the exclusive test leads.

14. Never open tester case except when replacing batteries or fuses.

Do not attempt any alterations of original specifications.

15. To ensure safety and maintain accuracy, calibrate and check the

tester at least once a year.

16. Indoor use.

Maximum Overload Protection Input

Function

(Range)

Maximu rating

input value

Maximum overload

protection input

ACV (600) AC600V AC720V

DCV(60) DC60V AC600V

【2】Applications and Features

2.1 Applications

・DC insulation resistance tester to measure the insulation resistance

of electric lines and electric equipment.

2.2 Features

・This tester is based on the revised standard JIS C1302-1994 Insulation

resistance testers.

・It is equipped with the discharge function.

・It is equipped with the MΩ(insulation resistance) measuring switch

that enables both one-shot and continuous measurement.

CAUTION

High voltage is generated in terminals of insulation resistance testers

when measuring insulation resistance. (There may be possibility to

damage the measuring object when measurement). Remove

components such as semiconductors from the circuit of measuring

object to avoid damages when withstand of the object is unknown or

lower than rated measuring voltage of a resistance insulation tester.

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【3】Front View and Name of Each Part

Test lead with test pin (Red)

Plug

Finger guard

Test pin

Test lead with clip (Black) Clip

MΩ

(insulation

resistance)

measuring

switch

Function control knob

Earth side measuring

terminal (EARTH)

Line side measuring

terminal (LINE)

MΩscale

(insulation resistance)

ACV scale

DCV scale

Battery check

scale

Pointer

0 position

adjuster

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【4】Description of Functions

・Function control knob and MΩ(insulation resistance) measuring switch

by operating these two switches, the functions and ranges can be

set as shown below.

Position of Function Control Knob

MΩ

Measuring

Switch (*)

Set Range

(Function)

DM508S 500V/1000MΩAC

DM1008S

1000V/2000MΩOFF AC600V range

PDM508S

500V/100MΩ600V

DM508S 500V/1000MΩAC

0500V/1000MΩ

DM1008S

1000V/2000MΩON

1000V/2000MΩ

PDM508S

500V/100MΩ600V

00500V/100MΩ

BATTERY CHECK ON

BATTERY CHECK

DC60V OFF DC60V

＊The MΩmeasuring switch is turned on by the following operation.

①ON only when the right end of the lever is pressed with a finger.

(OFF when the finger is released)

②Continuously ON when the left end of the lever is raised. (OFF

when it is laid down)

Raise left end

・Meter zero position adjustment

If the meter pointer is not on the ∞graduation line of the MΩscale

when the function control knob is at OFF, adjust the zero position

with a screwdriver.

Press right end

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D-1034-126DM508S/DM1008S/PDM508S英文

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【5】Measuring Method

5.1 Start-up Check

WARNING

1. Do not use a damaged tester or test lead.

2. Make sure test lead wiring is not broken.

3. When testing the continuity of a test lead, the measuring terminals

are under a high voltage. Be careful of electric shock.

4. To prevent electric shock and battery consumption, be sure to

turn the MΩmeasuring switch and function control knob to OFF

after measurement.

HowTo Use Carrying Case

During measurement, set the case as illustrated and hang it from

the neck.

Join by hook

To carry while held

by hand

Join by hook

To hang from the neck

during measurement

・Lid turns in

direction at pivot the A.

・Lay it along the bottom

of the box and secure it

by hooks marked by*

A

＊

Body securing band

Body compartment

Test lead

compartment

＊

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D-1034-126DM508S/DM1008S/PDM508S英文

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Before starting measurement, check theappearance,pointer 0

position(*),built-in batteryandmeasuring leadin this order. (*The

pointer 0 position is the 0 position of the DC60V scale or ∞position of

the MΩscale.)

Check start.

Check appearance and pointer 0 position.

Main unit and

test lead damaged

in appearance?

Pointer at 0 position

when main unit is placed

horizontally?

Stop using.

Repair it.

Place main unit

horizontally,

adjust pointer 0

position adjuster

with screwdriver

to bring pointer

to 0 position.

Damaged

No damaged

No

Yes

Check built-in battery.

Turn function control knob

to DC60V/BATTERY CHECK.

Pointer is on left of battery

check scale（BATT）?

Turn function control knob

and MΩswitch to OFF.

Replace

battery.

See 7.4

Battery

Replacement.

Check measuring lead wiring breakage.

Connect lead with clip to EARTH terminal

and lead with test pin to LINE terminal.

Clamp test pin with clip (to short).

Turn function control knob to

AC600V・250V/500ΩM.

Turn on MΩmeasuring switch.

Release push switch and replace test

lead with new one and re-check.

If replacement does not work, repair

Turn MΩmeasuring switch and

function control knob to OFF.

Normal. Proceed to measurement.

Pointer is at almost 0MΩ

position of insulation resistance

scale ?

No

Yes

No

Yes

Turn on MΩ

switch.

5.2 How to Check Bult-in Battery (BATTERY CHECK)

Prior to MΩ(insulation resistance) measurement, be sure to check the

built-in battery. A consumed battery will cause not only measurement

errors but danger due to erroneous measurement.

For checking methods, refer to 5.1 Start-up Check.

Do not check the built-in battery for more than 5 seconds.

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D-1034-126DM508S/DM1008S/PDM508S英文

1. Never apply a voltage to the measuring terminal when the tester

is in the MΩmeasuring range.

2. Prior to measurement, disconnect the measuring object (circuit)

from the power supply.

3. Prior to measurement, make sure no voltage is applied to the

circuit to measure by the AC600V range.

4. During measurement, a high voltage is generated. Do not touch

the test pin, clip and measuring object.

5. The tester and measured circuit have been charged by high voltage

immediately after the measurement. Be careful not to get electric

shock.

6. There is a possibility of an accident of electric shock. After the

measurement, be sure to discharge the high voltage charged in

the measuring object. (See 5.4 Discharge Function)

−7−

5.3 Measurement of MΩ(Insulation Resistance)

WARNING

CAUTION

1. When the measuring object is grounded (earth), a normal practice

is to connect the lead with clip (EARTH) to ground (earth) and the

lead with test pin (LINE) to the circuit. (When this connection is

used, a measurement value becomes smaller than a value

obtained by the reverse connection.)

2. To prevent a measuring error, keep the test lead connected to

the LINE side out of contact with the measuring object and ground

(earth).

3. The insulation resistance varies largely depending on temperature

and humidity. It is also influenced by a voltage to apply (measuring

voltage).

Normally as temperature, humidity and voltage increase, the

insulation resistance decreases.

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−8−

1. The rated measuring current of this tester is 1 mA. (1 mA to 1.2

mA when the resistance of a value below the rated measuring

voltage/1 mA and within 1st effective measurement scale is

measured.)

2. The no-load voltage is within 1.3 times the rated measuring

voltage.

3. While measuring there may be an oscillator noise from the meter,

but this is not a malfunction.

1) Measuring object

Measurement of insulation resistance (MΩ) of electric equipment

and circuits.

2) Rated measuring voltage

Model

Rated measuring voltage

DM508S 500V

DM1008S 1000V

PDM508S 500V

3) Selection of a measuring range

Turn the function control knob to (MΩ) / AC600V position.

4) Measuring method

①Power off the measuring object.

②Connect the lead with clip (black) to the earth side measuring

ternimal (EARTH) and the lead with test pin (red) to the line side

measuring terminal (LINE).

③Turn the function control knob to a desired rated measuring

voltage range.

④Connect the clip of the lead with clip to the measuring object.

Normally, the earth side measuring terminal should be on the

earth line side.

⑤Bring the test pin of the lead with test pin in contact with the

other side of the measuring object.

CAUTION: If the meter deflects in this state, the measuring

object is charged. Be sure to remove the voltage

prior to measurement.

REFERENCE

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D-1034-126DM508S/DM1008S/PDM508S英文

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⑥Turn on the MΩmeasuring switch.

(See [4] Description of Functions)

⑦Read the indicated value. Use the MΩscale.

⑧Turn off the MΩmeasuring switch.

⑨Discharge the high voltage charged in the measuring object. See

5.4 Discharge Function.

⑩First, disconnect the test pin of the lead with test pin from the

measuring object. Then remove the clip of the lead with clip.

⑪Be sure to turn the function control knob to the position of OFF.

CAUTION

Rated measuring voltage should be selected by a measuring object.

For example, 125V rated measuring voltage should be used for the

object, AC input voltage of which is 100V.

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5.4 Discharge Function

1) Reason of a need to discharge

For safety, high voltage remaining in capacitive measuring objects

such as capacitors and electric wire must be discharged to prevent

accidents.

2) Discharging method

This procedure follows the step ⑧of 5.3-4)

①When the MΩmeasurement has been completed, turn off only

the MΩmeasuring switch with the test pin and the clip connected

to the measuring object.

②Then the pointer deflects to the right and its deflection becomes

smaller as time passes (indicating the charged charge is being

discharged).

③When the pointer stops at zero (∞of the MΩscale) and discharge

has been completed, conduct the steps ⑩and ⑪of 5.3-4)

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1. Do not apply a voltage exceeding the maximum rated voltage of

600 VAC.

2. During measurement, do not operate the function control knob.

3. Do not measure a voltage with the MΩmeasuring switch being

pressed or raised.

4. When the circuit to measure has a breaker, measure the voltage

on the secondary side (load side).

5. To prevent electric shock, do not touch the metal part of the pin

plug and clip.

−11−

5.5

Measurement of ACV (AC voltage) (Measuring range is the AC600V range only)

WARNING

CAUTION

AC voltages of waveforms other

than sinusoidal waveforms and

frequencies other than 50 to 60

Hz will cause an indication error.

1) Measuring object

Sinusoidal AC voltages (ACV)

such as lighting line voltages

can be measured.

2) Measuring method

①Connect the lead with clip

(black) to the earth side

measuring terminal and the

lead with test pin (red) to the

line side measuring terminal.

②Turn the function control knob to AC600V.

③Connect the lead with clip to the earth side of the circuit to measure

and the lead with test pin to the charging side (line side).

④Read the indicated value on the ACV scale.

⑤Disconnect the lead with test pin and the lead with clip in this

order from the measuring object.

⑥Turn the function control knob to the position of OFF.

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5.6

Measurement of DCV (DC voltage) (Measuring range is the DV60V range only)

WARNING

1. Do not apply a voltage exceeding the maximum rated voltage of

60 VDC.

2. Keep in mind the warnings of 5.5 described earlier.

1) Measuring object

DC voltages of batteries, etc. can be

measured. Also, the tester can be used

to check the presence of DC voltage prior

to MΩmeasurement.

2) Measuring method

①Connect the lead with clip (black) to the

earth side measuring terminal and the

lead with test pin (red) to the line side

measuring terminal.

②Turn the function control knob to DC60V.

③Connect the lead with clip (black) to the

negative (−) side of the measuring object

(circuit) and the lead with test pin (red) to the positive (＋) side.

④Read the indicated value on the DCV scale.

⑤Disconnect the lead with test pin and the lead with clip in this

order from the measuring object.

⑥Turn the function control knob to the position of OFF.

【6】Battery Replacement

①Remove two battery lid

securing screws.

②Replace the consumed

battery that is connected to

the snap terminal with a

new one.

③Set the battery in the

original place and secure the

battery lid with screws.

Be sure to turn the function control knob to the position of

OFF prior to replacing the battery.

Be sure to use the alkaline battery 6LR61 (9V).

Screws

Battery lid

6LR61 Battery

Snap terminal

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D-1034-126DM508S/DM1008S/PDM508S英文

・MΩrange

1st effective

measurement range : ±5% of reading

2nd effective

measurement range : ±10% of reading

0, ∞scale : ±0.7% of scale length

No load voltage :

% of rated measuring voltage

Rated measuring current

: 1~1.2mA

Short circuit current : max 2mA

Rated measuring voltage

Measuring value

−13−

【7】Specifications

7. 1 Measurement Range and Accuracy

7. 1 Accuracyassurance : 23℃±2℃ 45〜75％RH max.

No condensaition

7. 1 Attitude : Horizontal (±5°)

Model DM508S DM1008S PDM508S

MΩ

Insulation

Resistance

range

ACV range

DCV range

Accuracy

Large numeral : 1st effective measuring scale

Small numeral : 2nd effective measuring scale

500V

1000MΩ

0.5-1-500-

100 0MΩ

1000V

2000MΩ

1-2-1000-

2000MΩ

500V

100MΩ

0.05

-0.1-

50-

100

MΩ

0~600V

0~60V

・ACV range (50/60Hz sine wave) : ±5% of full scale

・DCV range : ±5% of full scale

＋30

−0

（）

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7. 2 General Specifications

AC rectifying method : Half-wave rectification

(Mean value indication rms value converted)

Meter specification :

Inner-pole type taut-band system, 24μA (PDM508S:48μA)

Battery consumption : Checked by BATTERY CHECK range.

Allowable temperature/humidity range

: 18〜28 ℃, 45〜75% RH.

Service temperature/humidity

: 0〜40℃, 80% RH max., no condensation.

Storage temperature/humidity

: -10〜50℃, 70% RH max., no condensation.

Service ambient condition

:

Altitude 2000 m max., environmental pollution Ⅱ.

Built-in battery :

Layer built type alkaline battery 6LR61 x 1 (9V)

Max. power consumption

: 2.0W~2.8W at MΩrange

Continuous service hours

: DM508S Approx 5.5hours

DM1008S Approx 3.5hours

PDM508S Approx 4.0hours

Applicable standard : JIS C 1302-1994 Insulation resistance testers.

Safety standard :

IEC-1010-1(EN61010-1) Overvoltage category Ⅲ,

protection class

Ⅱ

(600V AC/DC or less).

Withstand voltage : 3.7 kV AC (one minute), between measuring

terminal and rear case.

Size and weight : 144(H) x 99 (W) x 43 (D) mm, approx. 310g

Accessories : Test lead TL-508S, 1 set

Instruction manual, 1 copy

Carrying case C-08S, 1 piece

【8】Storage

CAUTION

・The panel and the case are not resistant to heat. Do not place the

instrument near heat-generating devices (such as a soldering iron).

・Do not store the instrument in a place where it may be subjected

to vibration or from where it may fall.

・For storing the instrument, avoid hot, cold or humid piaces or

places under direct sunlight or where condensation is anticipated.

When indicating the center

scale value of the MΩrange

（  



）

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D-1034-143 SANWA PC5000(E)

SANWA ELECTRIC

INSTRUMENT CO.,LTD.

Dempa Bldg,Sotokanda2-Chome

Chiyoda-Ku,Tokyo,Japan

3 02.02M

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Sanwa DM508S User manual

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