User’s

Manual

Model MY40

Insulation Resistance Tester

Thank you for purchasing the Yokogawa M&C MY40 Insulation Tester.

To optimize all the functions of the instrument, please read this manual thoroughly before operating it.

Store this manual in a safe place for future reference.

1st Edition : Nov. 2000(YG)

All Rights Reserved, Copyright ©2000, Yokogawa M&C Corporation

1. Safety Precautions

Always observe the following instructions. Failure to do so may result in electrical shock or other dangers that may lead to serious injury or the loss of life.

Yokogawa M&C Corporation is in no way liable for any damage resulting from the user's mishandling of the tester.

For safe use of this tester, the following safety symbols are used in the user's manual:

WARNING

This indicates that the operator must refer to an explanation in the user's manual in order to avoid the risk of serious injury or the loss of life.

CAUTION

This indicates that the operator must refer to an explanation in the user's manual in order to avoid the risk of injury or damage to the tester.

Note

This provides important information for handling the tester and clarifies tester functions.

The following symbols are used on the MY40 tester.

Danger! Handle with Care.

This symbol indicates that the operator must refer to an explanation in the user's manual in order to avoid risk of injury or death of personnel or damage to the tester.

High-voltage Terminal

This symbol indicates a dangerous voltage level (terminals with voltages exceeding 1000 volts must be so marked). Never touch the terminals.

AC Voltage

This symbol indicates the presence of an AC voltage.

Double Insulation

This symbol indicates double insulation.

3. Measuring Functions and Additional Features

■ Measuring Functions

• Measuring the insulation resistance (four ratings)

125 V/ 200 M Ω

250 V/ 200 M Ω

500 V/ 2000 M Ω

1000 V/ 2000 M Ω

• Measuring AC voltages (sine wave at 45 to 400 Hz)

• Measuring conductor resistances (0 to 400.0 Ω )

Continuity test (beeps for 40 Ω or less)

■ Additional Features

• Memory feature (data saving)

Up to 20 measured values of the insulation resistance for each rating can be saved to memory.

• Live-line alarm

When an AC voltage of 40 V or more is applied between the input terminals, the ALARM LED flashes and the buzzer beeps

(except during AC voltage measurement).

• Comparator

When a measured insulation resistance is less than the reference value setting, the LOW mark appears and the buzzer beeps.

• HOLD feature

Measured insulation resistances are automatically held for approximately five seconds.

• High-voltage indication

If a DC voltage exists between the terminals, the HV mark and the ALARM LED come on.

• Discharge feature

The tester is designed to begin discharging when the MEAS key is turned off.

It indicates the discharging status with a bar graph, and the

HV mark and ALARM LED come on during discharging (and off when discharging is complete).

• Auto-power off

The tester is automatically turned off when no key operations are performed for 10 minutes.

• LCD backlight

The backlight can be turned on/off with the LIGHT key.

• Locking the MEAS key

Pulling the MEAS key up allows for continuous measurement over a prolonged time.

• Lock for inadvertent setting of 1000-V range

This mechanism protects the measured circuit from damage due to inadvertent measurement with the highest voltage

(1000 V).

IM MY40-E

2nd Edition: July, 2001

WARNING

■ Always observe the following instructions. Failure to do so may

result in electric shock or other dangers that may lead to serious

injury or the loss of life.

1. During Measurement of Insulation Resistance

• A high voltage is present at the probes. Do not touch the measured

object or the earth or line terminal.

2. Immediately After Measurement of Insulation Resistance

• The probes or the measured object may remain highly charged.

Do not touch them immediately after the completion of measurement.

3. During Measurement of AC Voltages

• Do not press the MEAS key while measuring AC voltages.

• Voltage that exceeds the specified limit must not be applied to terminals.

4. Probes

• Use the probes supplied by Yokogawa M&C with this tester.

• Do not use probes that have deteriorated or are defective.

• Remove the probes from the measured object before attaching/

detaching the probes to/from the tester.

5. Insulation of Casing

• A puncture in the protective insulation may occur if there are any

cracks or other damage in the casing as a result of the instrument

having been dropped or knocked against another object.

Do not use the instrument before taking the necessary remedial

measures; ask the manufacturer to repair it.

6. The Measured Object

• Turn off the power to the measured object before you begin

measuring insulation resistance.

• Avoid touching any electrified parts while using the tester in

a location with live electricity. For safety, it is recommended that

you use a pair of rubber gloves or other alternative means.

7. Operating Environment

• Do not operate the tester in an atmosphere where any flammable

or explosive gas is present.

• Do not use the tester if there is condensation on it.

8. Disassembly

• No person, except personnel from Yokogawa M&C, is authorized

to disassemble this instrument.

4. Overrange Display Functions

■ OL Display

The tester displays the OL mark when the measured resistance exceeds the following values.

Insulation resistance measurement:

For 1000 V and 500 V ratings: 2000 M Ω

For 250 V and 125 V ratings: 200 M Ω

Conductor resistance measurement: 400 Ω

■

∞

Display

The tester displays the

∞

mark when the internal calculation exceeds the following values.

Insulation resistance measurement:

For 1000 V and 500 V ratings: approx. 4000 M Ω

For 250 V and 125 V ratings: approx. 400 M Ω

■ Change to Upper/Lower Ranges

• To upper range

When the digital reading exceeds 4000, the measuring range changes to the next upper range.

• To lower range

When the digital reading falls below 360, the measuring range changes to the next lower range.

■ Lower Resolution Display

If the digits below the decimal point are not stable, they can be automatically omitted to limit the resolution.

5. Display Functions

OL

Lit when the measured insulation resistance is being held.

Flashes when the battery voltage is low.

Lit when the rating setting is 1000 V/2000 M Ω .

Lit when the rating setting is 500 V/2000 M Ω .

Lit when the rating setting is 250 V/200 M Ω .

Lit when the rating setting is 125 V/200 M Ω .

Indicates overrange.

Indicates the extension bar graph.

The extension bar graph shows how the measured value is changing (trend) as follows:

Note that the number of marks means the degree of change.

: Change toward smaller values

: Change toward larger values

: Stable

Lit when:

• Pressing the MEAS key in insulation resistance measurement; and

• Residual electrical charges are present during discharging.

Lit when the comparator is activated.

Lit when the measured insulation resistance is lower than the comparator setting value.

Lit when the memory feature is in use.

Indicates the unit for AC voltage measurement.

Indicates the unit for insulation resistances.

Indicates the unit for conductor resistance measurement.

Indicates the continuity mark, which is lit when the measured insulation resistance is lower than 40 Ω .

Sub-display

Indicates:

• Comparator setting value or the storage number; or

• The storage number for memory.

Indicates the unit for insulation resistance for comparator.

2. Components

Front view

3. LIGHT key 1. Display window

(LCD)

Side view

2. MEAS key

5. COMPARATOR key

ALARM

INSULATION TESTER

MEAS

PULL LOCK

LIGHT

MEM

COMP

Enter

Select

2000M Ω

1000V

500V

200M Ω

250V

125V

V

600V MAX

OFF

Clr

1000V RELEASE

6. ALARM LED

7. Function selector switch

4. Protective cover fitting

8. 1000-V RELEASE button

for setting 1000-V rating

12. Earth terminal

Rear view

13. Line terminal

11. Shoulder strap

guide

6. Functions for Each Component

1. Display window (LCD)

Displays the measured values and the function marks (see section

5, “Display Functions”).

2. MEAS key

Used for measuring the insulation resistance only.

3. LIGHT key: Used for turning on/off the backlight.

(MEM key): Also used for setting memory.

(Enter key): Also used for confirmation for the comparator and memory functions.

4. Protective cover fitting

5. COMP key: Used for setting the comparator.

(Select key): Also used for selection for the comparator and memory functions.

6. ALARM LED

Flashes for the live-line alarm, and is lit as a warning for the high

-voltage alarm.

7. Function switch

A rotary switch for setting measurement ratings with the following positions:

• 1000 V/ 2000 M Ω : Insulation resistance measurement

• 500 V/ 2000 M Ω : Insulation resistance measurement

• 250 V/ 200 M Ω : Insulation resistance measurement

• 125 V/ 200 M Ω : Insulation resistance measurement

• AC voltage measurement (maximum input voltage: 600 V)

• Power off

• Conductor resistance measurement

Continuity test

CLr: Memory clear

8. 1000-V RELEASE button

Turn the function switch to the 1000 V rating position while pressing this button.

9. Battery cover setscrew

Undo to replace batteries.

10. Battery cover

11. Shoulder strap guide

The shoulder strap is passed through it.

12. Earth terminal

Connection for earth probe.

13. Line terminal

Connection for line probe.

Note

• GUARD function is not a standard function.

8. Before Measurement

1. Safety

• Read the handling precautions in this manual carefully.

• Make sure it is safe before starting measurement.

2. Battery Voltage Verification

• Make sure that the battery voltages are within the valid ratings (i.e. the mark is not flashing).

• If the batteries are low, replace them as specified in the battery replacement section of this manual.

Note

As the mark indication depends on the load (current consumption), check that the mark does not appear for the largest load when short-circuiting the earth probe and the line probe

(0 M Ω ).

3. Connecting the Probes

• Plug the earth probe into the earth terminal.

• Plug the line probe into the line terminal.

WARNING

• Remove the probes from the measured object before attaching/

detaching the probes to/from the tester.

• Make sure the MEAS key is off when attaching/detaching

the probes to/from the tester.

4. Function Switch Verification

Be sure to confirm that the function switch is set to the desired rating.

5. 1000-V Rating

When measuring with the 1000-V rating, see section 12, “Doubleaction 1000-V Function”.

OPEN

9. Battery cover setscrew 10. Battery cover

7. Using Protection Cover and Shoulder Strap

The tester comes with a protection cover and shoulder strap as standard accessories.

• The protection cover can be used as a front cover

(for the display window) or as a bottom cover.

(It is set as the front cover when

delivered from the factory.)

• Using the shoulder strap allows you to position the tester in front of your chest for ease of reading. Pass the strap through the shoulder strap guide and adjust the length of the strap to allow you a good view of the tester.

• Remove the cover from the front, and attach it to the bottom using the fixing hole (B) on the surface of the cover. This is useful when the diaplay is too close to your body to see clearly (See the figure on the right).

• A belt on the cover which is fitted with pieces of

Velcro, can be used to store the probes (Remove the probes from the tester terminals when storing them).

Protection cover fixing holes

Shoulder strap

A

B

Protection cover

Shoulder strap guide

9. Battery Replacement

WARNING

• Remove the probes from the tester and then turn off

the MEAS key before opening the casing to replace the batteries.

• Do not touch the MEAS key during replacement. Otherwise,

a high voltage may be produced.

1. Loosen the battery cover setscrew, and then slide the cover off of

the main unit.

2. Replace all of the 4 batteries at the same time and make sure the

polarities of the new batteries are exactly as shown on the

battery holder.

3. After replacing the batteries, attach the battery cover and tighten the

setscrew.

CAUTION

• Do not mix batteries of different types or new batteries with used ones.

• Always remove the batteries if the tester will not be used for

a prolonged period of time. If you store the tester with the batteries

left installed, fluid is likely to leak from them, resulting in

a malfunctioning of the instrument.

10. Battery Life (Reference only)

For MY40 at rated 500 V/2000 M Ω :

Approximately 15 hours when in continuous operation with center value indicated (approx. 50 M Ω ; with standard supplied batteries).

Note

The data above is typical. Nevertheless, the battery life varies depending on the operating conditions. Check the batteries before measurement.

11. Measuring the Insulation Resistance

1. Before Connecting the Probes

WARNING

• Turn off the power to the measured object before connecting or

measuring insulation resistance.

• Electrical charges may be present in the cables attached to or

metal of the electrical equipment being tested. Verify that the

equipment is free from electrical charges before connecting the

testing terminals.

• Be sure to confirm that the function switch is set to the desired

rating.

Insulation resistance ratings:

125 V/ 200 M Ω

250 V/ 200 M Ω

500 V/ 2000 M Ω

1000 V/ 2000 M Ω

2. Setting the Function Switch

Turn the function switch to the desired measurement rating position. The initial display is “---- M Ω ”.

3. Connecting the Earth Probe

• If the measured object is grounded, connect the earth probe clip to the measured object’s ground line.

• If the measured object is not grounded, this process may be omitted.

4. Connecting the Line Probe

• Bring the line probe into contact with the measured object, and then press the MEAS key. The display indicates the insulation resistance of the measured object.

Note

During measurement, exercise care to prevent the leadwire of the line probe from coming into contact with the ground, floor or any other object. Not observing this precaution may result in a failure to measure the correct insulation resistance.

5. After Measurement

WARNING

• Immediately after measurement, electrical charges resulting from

the applied testing voltage may remain present in the probes or

measured object.

• The tester, therefore, is designed to automatically begin

discharging electricity upon completion of measurement. Verify

that the ALARM LED turns off when discharging is complete.

12. Double-action 1000-V Function

The tester is equipped with the RELEASE button to protect the measured circuit from damage due to inadvertent measurement at 1000 V.

To select the 1000 V rating, turn the function switch to the position while pressing this button. To cancel the 1000 V rating, turn the function switch to the off position or another rating position.

13. Live-line Alarm

Always turn off the power to the measured object before connecting or measuring insulation resistance. If an AC voltage of more than 40 V is applied, the ALARM LED flashes and the buzzer beeps. In this case, stop the measurement immediately and check the power supply voltage.

14. Locing the MEAS Key (for Continuous Measurement)

The MEAS key, when pulled up to the right, can be locked to ensure the key remains turned on. Use this mechanism when making continuous measurement over a prolonged period. Note, however, that leaving the key turned on for an unreasonably long time will accelerate the discharge of the batteries.

15. HOLD Feature

Measured insulation resistances are automatically held for approximately five seconds. Turning off the MEAS key initiates holding.

19. LIGHT and COMP Keys

The COMP key is used as the Select key for settings and storage numbers of the comparator and memory functions.

The

LIGHT

key is used as the Enter key for settings and storage numbers of the comparator and memory functions. Pressing the Enter key while the display is flashing, confirms selection of the setting or the storage numbers.

• When setting the memory or comparator function

Turn the function switch to an insulation resistance rating position while pressing and holding the LIGHT key or the COMP key until all the displayed digits stop flashing and remain on, and the buzzer sounds.

Or position the function switch to a rating of the insulation resistance first, press the

LIGHT

key or the

COMP

key when all the digits appear, and hold the key until the buzzer sounds.

■ Backlight

• The backlight remains off while the comparator is set.

• The backlight is lit when memory is in use.

20. Memory Feature (Data Saving)

Up to 20 measured values of the insulation resistance for each rating can be saved to memory.

■ Displaying data

(1) Turn the function switch from power-off to a measurement rating while pressing and holding the

LIGHT

key (MEM).

“MEM” appears and “no.01” (storage number) flashes on the subdisplay.

(2) Select a storage number.

Press the

COMP

key (Select) to select a storage number (no.01 to no.20).

If an insulation resistance data is saved with the selected (displayed) number, the insulation resistance value is displayed.

If any data is not saved with the selected (displayed) number, “----” is displayed.

■ Saving data

First select a storage number as in steps (1) and (2) above. Overwriting data is possible.

(3) Perform measurement with the MEAS key.

(4) Turn off the MEAS key. The measured value is held and starts flashing. Press the LIGHT key (Enter) while the measured value is flashing to save it to memory (it is held for five seconds in which time the next data cannot be saved).

Note

If the data being held is invalid, “----” is displayed and it cannot be saved. In this case, perform measurement again and save the data.

■ Deleting data

Data saved can be collectively deleted.

(1) Turn the function switch from power-off to the continuity test position (Clr) while pressing and holding the

LIGHT

key (MEM).

(2) “MEM” and “CLr” appear.

(3) Press the LIGHT key (MEM). “CLr” starts flashing.

(4) Press the LIGHT key (MEM) again while “CLr” is flashing. The buzzer sounds and all data are deleted (do not change the position of the function dial for two seconds when “CLr” is displayed). The tester changes its mode to measurement of conductor resistances.

Note

To stop deleting of data:

Do not perform any key operation and wait for 10 seconds while

the “CLr” indication mentioned in step (3) is flashing; or

Turn the function switch to another rating.

■ Turning off the memory feature

Turn the function switch to the off position.

16. Measuring AC Voltages

WARNING

• Do not press the MEAS key while measuring AC voltages.

• Voltage that exceeds the specified limit (600 V) must not be

applied to terminals. Doing so causes all digits of the measured

voltage to flash and the buzzer to beep.

1. Setting the Function Switch

Turn the function switch to an AC voltage measurement ( 앑 V) position.

2. Connecting the Earth Probe

• If the measured object is grounded, connect the earth probe clip to the measured object’s ground line.

• If the measured object is not grounded, this process may be omitted.

3. Connecting the Line Probe

• Bring the line probe into contact with the measured object.

The display indicates the AC voltage of measured object.

17. Measuring Conductor Resistance (Continuity)

The tester can measure the conductor resistance of 0-400 Ω . The buzzer beeps for resistances approximately 40 Ω or lower.

WARNING

• Turn off the power to the measured object before connecting or

measuring conductor resistance.

1. Setting the Function Switch

Turn the function switch to a conductor resistance measurement

( ) position.

2. Connecting the Earth Probe

Securely connect the earth probe to the measured object.

3. Connecting the Line Probe

Bring the line probe into contact with the measured object. The display indicates the resistance of the measured object.

Note

You do not have to press the MEAS key when you measure conductor resistances.

18. Auto Power-off

The tester is automatically turned off when no key operations are performed for 10 minutes.

The buzzer sounds 9 and a half minutes after the last key operation (at

1-sec intervals). If any measurement or key operation is not made while the buzzer sounds, the tester is turned off. However, it is not turned off when measurement is in progress or an alarm occurs.

To use the tester after the auto power-off is triggered, press the or the COMP

LIGHT key

key, or turn the function switch to the off position once before proceeding with the desired operation.

22. Specifications (JIS C1302-1994 compliance)

Rating

Center Value Indicated (M Ω )

1st Effective Measuring Range (M Ω )

2nd Effective Measuring Range

Lower Limit (M Ω )

2nd Effective Measuring Range

Upper Limit (M Ω )

Lower Measuring Limit of

Resistance (M Ω )

Rated Current (mA)

AC Voltage Measuring Range (V)

125V/200 M Ω

5

.0200 to 10.00

0 to.0199

10.01 to 200

0.125

1 to 1.2

Tolerances under the above conditions

Insulation resistance measurement:

± (2% of rdg + 6 dgt) within the 1st effective measuring range

± (5% of rdg + 6 dgt) within the 2nd effective measuring range (Lower limit)

± (5% of rdg) within the 2nd effective measuring range (Upper limit)

Zero value indicated: 6 dgt max.

AC voltage: ± (2% of rdg + 6 dgt)

Conductor resistance measurement: ± (2% of rdg + 8 dgt)

No-load voltage: within 130% of the rated voltage

Short-circuit current: 2 mA or less

250V/200 M Ω

5

.0500 to 20.00

0 to .0499

20.01 to 200

0.25

1 to 1.2

500V/2000 M Ω

50

1.000 to 500

0 to .999

501 to 2000

0.5

1 to 1.2

1000V/2000 M Ω

50

2.000 to 1000

0 to1.999

1001 to 2000

2

0.5 to 0.6

0 to 600

Standard test conditions

Ambient temperature and humidity: 23 ± 5 ° C at 45 to 75% RH

Position: Horizontal (within 5 degrees)

Influence of external magnetic field: Earth magnetism

Battery voltage: Within effective range of the battery (the mark must not be

indicated.)

Item

Response time

Effect of temperature

Limit

Digital indication: 3 sec or less

Bar graph indication (static) value: approx. 2 sec

± 2% or less

Effect of humidity

Effect of external magnetic field

Effect of AC component of voltage at measuring terminals

Insulation resistance

Within tolerance

3% or less of indication

10% or less of indication

Withstand voltage

Resistance to vibration

Resistance to shock

50 M Ω or more (between electric circuits and outer case)

There must not be an abnormality

(between electric circuits and outer case).

There are no mechanical and electrical damage.

The specifications for tolerances must be met.

There are no mechanical and electrical damage.

The specifications for tolerances must be met.

Endurance The specifications for tolerances must be met.

Protection against mistaken input

There must not be an abnormality.

Test condition

From the instant the resistors whose values correspond to central indication and zero indications are abruptly connected, to when the pointer reaches a level within tolerance

1st effective measuring range: maximum, center, and minimum indicated values

Deviation from those values when ambient temperature is varied from

20 ° C by ± 20 ° C.

When the tester is left for 1 hour with the humidity at 90% RH

The change of indication when an external field of 400 A/m DC is applied in the most affected direction

A change when a capacitor with 5 µ F ± 10% is connected in parallel to a resistor corresponding to central indication connected

When a voltage of 1000 V is applied.

When a sine wave, or the like, is applied between the electric circuits and the outer case at 5550 V AC and 50/60 Hz for 1 minute

When a vibration frequency of 16.7 Hz and peak-to-peak amplitude of

4 mm is applied in the direction of the axis of the moving part for 1 hour

When shock of 1000 m/s 2 is applied twice in the direction of axis of the moving part and in a direction perpendicular to the axis

When a resistor corresponding to the central indication is connected across the measuring terminals and the power switch is repeatedly turned on and off 10 000 cycles at a rate of about 300 cycles/hour

When an AC voltage of 50/60 Hz at 1.2 times the rated measuring voltage is applied to the measuring terminals for 10 seconds

21. Comparator

When a measured insulation resistance is less than the reference value setting, the LOW mark appears and the buzzer sounds. Also the measured value is automatically held for 5 seconds.

■ Selecting the reference value

Select from three preset values for each rating.

Default values: no.01: 0.1 M Ω / no.02: 0.2 M Ω / no.03: 0.4 M Ω

(1) Turn the function switch to a measurement rating.

(2) Press the COMP key.

(3) display.

appears and the reference value appears on the sub-

(4) Pressing the

COMP

key (Select) changes the reference value display as follows.

0.1 M Ω / 0.2 M Ω / 0.4 M Ω / Comparator off (no display)

The reference value currently displayed is selected as the comparator setting.

■ Setting the preset values

Each of the default preset values no.01 to no.03 can be changed independently.

(1) Turn the function switch from power-off to a desired rating while pressing and holding the COMP key. “no.01” on the sub-display flashes. Press the COMP key (Select) to select no.02 or no.03.

(2) Confirm the setting no. with the

LIGHT

key (Enter).

The reference value on the main display can be set.

(3) Select the position of the decimal point with the

COMP

key (Select).

(4) Confirm the decimal point with the

LIGHT

key (Enter).

(5) Select the number for each digit sequentially.

Pressing the COMP key (Select) changes the number as follows.

0 → 1 → 2 ··· 8 → 9 → 0

24. Accessories

■ Standard Accessories

Name

Protection cover

Shoulder strap

Line probe

Earth probe

User

, s manual

Model No.

93013

99005

98001

98002

—

IM MY40-E

Quantity

1

1

1

1

4

1

■ Optional Accessories

7.

8.

Name Model No.

1. Spare probe tip for the

line probe (Model 98001)

99011

Description

105 mm, breaker pin

2. Hard case

3. Accessory bag

4. Replaceable-type line probe

5. Spare probe tips for the

line probe (Model 98005)

6.

93015

B9108XA

98005

B9600GN

B9600NW

Houses both the main unit, the line probe and the earth probe.

Soft case, approx. 100 (W)

⫻

190 (H)

⫻

40 (D) mm

Cable length: 1000 mm

58 mm, general-purpose

360 mm, hook-shaped

B9600NX 360 mm, for extension purposes

108 mm, sharp-pointed

9.

B9600NZ

B9635JK 338 mm, pickax-shaped

1. 990 11 4. 980 05

2.

9. JK

3.

5. GN

6. NW

7. NX

8. NZ

23. General Specifications

Operation temperature and humidity

Storage temperature and humidity

Battery

External dimensions

Weight

0 ° C to 40 ° C at 90% RH or less (no condensation)

–10 ° C to 60 ° C at 70% RH or less (no condensation)

Four AA-size (R6)

Approx. 125 (W) × 103 (H) × 52.5 (D) mm

Approx. 420 g (main unit and batteries only)

Approx. 600 g

(main unit, batteries, protective cover, earth probe and line probe)

Safety standards

EMC standards

Effect of radiation immunity

EN61010-1:1993 and EN61010-2-31:1995

Insulation class 2 ,Pollution degree 2

Overvoltage category 3 (maximum input voltage: 600 V)

EN55011; 1998 Group1 ClassB

EN61326-1; 1997+A1; 1998

At the strength of radio-frequency electromagnetic field of

3V/m

• Insulation resistance measurement

1st effective measuring range : ± (5% of rdg +12dgt)

2nd effective measuring range : ± (10% of rdg +12dgt)

• AC Voltage measurement : ± (5% of rdg +12dgt)

• Conductor resistance measurement : ± (10% of range)

26. Maintenance

■ Storage Conditions

• Temperature and humidity:-10 ° C to 60 ° C at 70% RH or less

• Remove the batteries before storing the tester.

• Avoid storing the tester in a location where there is:

moisture; exposure to direct sunlight;

a high-temperature heat source nearby;

exposure to severe mechanical vibrations;

a large amount of dust and/or salt, or a corrosive gas.

■ Removal of Dirt

Do not use volatile solvents (such as paint thinners or benzine) as

they are likely to cause discoloration. Wipe off dirt with a cloth

dampened water or alcohol.

■ Calibration Cycle

It is recommended that the tester be calibrated once every year for

correct operation; ask Yokogawa M&C to do the periodic calibration

for you.

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

Main unit

125(4.92)

Main display

Sub-display Position of decimal point

Main display Sub-display

Insulation resistance measurement

(with comparator)

Comparator setting

Measured value

Reference value

Reference value no.

(6) Confirm the number with the LIGHT

(7) Set the number for the next digit.

key (Enter).

(8) When settings for all the digits are complete, the reference value starts flashing.

(9) Confirm the reference value with the

LIGHT

key (Enter). The buzzer sounds and the setting ends. The tester changes its mode to measurement of insulation resistances.

Repeat steps (1) to (9) to change other preset values.

Note

• To cancel the preset setting

Pressing the key (Select) in step (8) returns the setting

procedure to step (1). To stop the setting, turn the function switch

to the off position.

• To set the preset values for another rating

Turn the function dial to the desired rating (insulation resistance)

in step (8).

25. External Dimensions

INSULATION TESTER LIGHT

MEM

MEAS

PULL LOCK

COMP

Enter

Select

2000M Ω

1000V

500V

250V

200M Ω

125V

V

600V MAX

OFF

ALARM

Clr

1000V RELEASE

Earth probe

98002

1200(47.24)

Line probe

98001

1200(47.24)

Unit: mm

(apptox. inch)

52.5(2.07)

27. Corrective Measures in Case of Failure

If the instrument does not operate properly after taking the corrective measures shown below or any other failure that is not covered here occurs, contact the vendor from which you purchased the instrument.

Failures

• The tester displays nothing after turning the function switch to the on position.

• The display is light in color.

• The measured values are erroneous.

Items to Check

• The batteries are installed properly and their power levels are not low.

• The measuring probes are connected correctly and are not damaged.

• Whether the failure reoccurs after turning off the power and retrying the operation.

Error Messages

Err.0: An internal operation failure.

Turn off the power and retry the operation.

* If the failure reoccurs, the tester needs repairing.

Err.1: Cannot save the comparator or memory settings.

Measurement functions other than the comparator and memory functions operate normally.

Settings and data saved without the error indication (Err.1) can be used.

* If the failure reoccurs, the tester needs repairing.

Err.2: An internal operation failure.

Turn off the power and retry the operation.

* If the failure reoccurs, the tester needs repairing.

■ About This Manual

The contents of this manual are subject to change without prior notice.

Under absolutely no circumstances may the contents of this manual be transcribed or copied, in part or in whole, without obtaining permission.

Every effort has been made to ensure accuracy in the preparation of this manual. Should any errors or omissions come to your attention however, please inform Yokogawa M&C Corporation accordingly.