YOKOGAWA MY10, MY10-02, MY10-03, MY10-04, MY10-05 User Manual

User’s

1. Indicator window

3. BATT CHECK key

2. MEAS key

6. ALARM LED

Front view

Rear view

Side view

5. Zero adjustment (screw)

7. Battery cover setscrew

8. Battery cover

9. Shoulder strap guide

10. Earth terminal

11. Line terminal

4. Protective cover fitting

WARNING

• Turn off the power to the measured object before connecting the
probes 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.

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.

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.

Note

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

WARNING

•

Do not press the MEAS key while measuring AC voltages.

Otherwise, it may result in a failure.

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

Note

When measuring insulation resistance, the tester can also be used
to verify that there is no voltage present at the measured object.

Manual

Model MY10
Insulation Resistance Tester

Thank you for purchasing the Yokogawa M&C MY10 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 : Jan. 2000(YG)
All Rights Reserved, Copyright©1999, Yokogawa M&C Corporation

1st Edition: Jan. 2000

3rd Edition: July. 2001

■ 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.

1. Safety Precautions

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.
Yokogawa M&C Corporation is in no wa y liab le f or any damage result­ing from the user's mishandling of the tester.
For safe use of this tester , the f ollowing saf ety symbols are used in the

user's manual:

WARNING

This indicates that the operator must refer to an e xplanation 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 MY10 tester.

Danger! Handle with Care.
This symbol indicates that the operator must refer to an e xplanation 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). Ne ver touch the termi-

nals.

This symbol indicates the presence of an AC voltage.

This symbol indicates double insulation.

AC Voltage

Double Insulation

IM MY10-E

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 tester.

2. Measuring Functions and Additional Features

■ Measuring Functions

• Measuring the insulation resistance

• Measuring AC voltages (sine wave at 50/60 Hz)

■ Additional Features

• Discharge feature
The tester is designed to begin discharging when the MEAS
key is turned off. The ALARM LED turns off when discharging
is complete.

• Battery check
This function verifies if the battery voltages are within the valid
ranges. (When the battely is checked, the pointer must be
within the BATT mark.)

• Phosphorescent scale plate
The indicator window lights up according to the intensity of
light.

• Locking the MEAS key
Pulling the MEAS key up allows f or continuous measurement
over a prolonged period of time.

3. Components and Their Functions

1. Indicator window

2. MEAS key

3. BATT CHECK key

Verifies if the battery voltages are within the valid ranges.

4. Protective cover fitting

5. Zero adjustment (screw)

6. ALARM LED

• Discharge feature (On➞ Off)
When lit, it indicates that a capacitive component in the
measured object remains electrified and will light up even if
measurement has been completed. It turns off when discharge

is complete.

7. Battery cover setscrew Undo to replace batteries.

8. Battery cover

9. Shoulder strap guide The shoulder strap is passed through it.

10. Earth terminal Connection for earth probe.

11. Line terminal Connection for line probe.

Note

• GUARD function is not a standard function.

4. Before Measurement

1. Safety

• Read the handling precautions in this manual carefully.

• Make sure it is safe before starting measurement.

2. How to Read the Scale

• Read the value from the top-right of the scale.

3. Zero Adjustment

• Confirm that the pointer is at the center of the infinity sign (∞);
if it is, do not press the MEAS key.

• If it is not, adjust the pointer to indicate the center of the infinity

4. Battery Volta ge Verification

5. Connecting the Probes

sign (∞) with the zero adjustment scre w using a slotted screwdriver.

• Press the BA TT CHECK key to make sure the battery voltages
are within the valid ranges. (When the battely is checked, the
pointer must be within the BATT mark.)

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

• 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.

5. Measuring the Insulation Resistance

1. Before Connecting the Probes

2. Connecting the Earth Probe

• Securely connect the earth probe to the

ground line (if the measured object is not grounded, this

measured object’s

process may be omitted).

3. Connecting the Line Probe

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

4. After Measurement

Locking 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.

Battery Life (reference only)

For MY10-03 at rated 500 V/100 MΩ:
Approximately 10 hours when in continuously operation with central
indication (approx. 2 MΩ; with standard supplied batteries).

6. Measuring AC Voltages

1. Connecting the Earth Probe

• Securely connect the earth probe to the measured object’s
ground line (if the measured object is not grounded, this

2. Connecting the Line Probe

process may be omitted).

•Bring the line probe into contact with
the measured object.
The pointer indicates the AC voltage.
Read the value on the voltage
measurement scale (~ V).
If the voltage of 20 V AC or more is
present between the earth and line
terminals, the ALARM LED turns on.

7. Specifications (JIS C1302-1994 compliance)

Operation temperature
and humidity
Storage temperature
and humidity
Battery
External dimensions
Weight

Safety standards

EMC Standard

Effect of radiation
ilmmunity

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

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

AA-size (4), [R6]
Approx. 125 (W) × 103 (H) × 52.5 (D) mm
Approx. 500 g (main unit and batteries only)
Approx. 600 g
(main unit, batteries, protective cover, earth probe and line probe)
EN61010-1:1993, EN61010-2-31:1995
Insulation class2,Pollution degree 2
Overvoltage category3 (maximum input voltage: 600 V)
EN55011; 1998 Group1 ClassB
EN61326-1; 1997+A1; 1998
At the strength of radio-frequency electromagnetic field of 3 V/m

• Insulation resistance measurement
1st effective measuring range : ±10% of rdg
2nd effective measuring range : ±20% of rdg
Infinity and zero indications : 1.4% or less of scale length

• AC Voltage measurement : ±10% of FS

Main unit

Earth probe

Line probe

1200 (47.24)

1200 (47.24)

Unit: mm

(approx. inch)

125 (4.92)

52.5 (2.07)

103 (4.06)

A

B

Protection cover fixing holes

Shoulder strap

Shoulder strap guide

Protection cover

Name Model No. Quantity
Protection cover 930 13 1

Shoulder strap 990 05 1
Line probe 980 01 1
Earth probe 980 02 1
Batteries — 4

User’s manual IM MY10-E 1

Name

2. Hard case

58 mm, general-purpose

DescriptionModel No.

1. Spare probe tip for the line
probe (Model 98001)

105 mm, breaker pin
Houses both the main unit, the line probe

and the earth probe.

3. Accessory bag

Soft case, approx. 100 (W) ⫻ 190 (H)
⫻ 40 (D) mm

4. Replaceable-type line probe

Cable length: 1000 mm

5. Spare probe tips for the line
probe (Model 98005)

108 mm, sharp-pointed
338 mm, pickax-shaped

360 mm, hook-shaped
360 mm, for extension purposes

99011

93015

B9108XA

98005

B9600GN

B9635JK

B9600NZ

B9600NX

B9600NW6.

7.

8.

9.

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.

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.

Model

Rating 125 V/20 M Ω 250 V/50 M Ω 500 V/100 M Ω 500 V/1000 M Ω 1000 V/2000 M Ω

MY10-01 MY10-02 MY10-03 MY10-04 MY10-05

8. General Specifications

11. Accessories

■ Standard Accessories

Central Indication
1st Effective

Measuring Range

2nd Effective
Measuring Range

Lower Measuring Limit of
Resistance

Rated Current

AC Voltage
Measuring Range

0.5 M Ω 1 M Ω 2 M Ω 20 M Ω 50 M Ω

0.02 to 10 M Ω

0.01 to 0.02 M Ω
10 to 20 M Ω

0.125 M Ω

1 to 1.2 mA 1 to 1.2 mA 1 to 1.2 mA

0 to 250 V 0 to 300 V 0 to 500 V 0 to 500 V 0 to 500 V

■ First and second effective measuring ranges

<1> 1st effective measuring range
<2> 2nd effective measuring range
The values which belong to both the first and second ranges in the table
above, are included in the first range.

∞

Tolerances under the above conditions

Resistance measurement: ±5% of reading within the 1st effective measuring range
Infinity and zero indications: 0.7% or less of scale length

AC voltage: ±10% of the maximum value
No-load voltage: Within 130% of the rated voltage
Short-circuit current: 12 mA or less

Scale length: Approx. 107 mm

Item Limit Test condition

Response time 3 sec or less

Friction No friction is recognized

Effects of inclination 2% or less of the scale length

Effect of temperature

Effect of humidity Within tolerance When the tester is left for 1 hour with the humidity at 90% RH

Effect of external
magnetic field

Effect of
AC component of
measuring terminal voltage

Insulation resistance

Dielectric
withstand voltage

Resistance to vibration

Resistance to shock

Endurance The specifications for tolerances and friction must be met.

Input over-voltage
protection

±10% of reading within the 2nd effective measuring range

(1) 5% or less
(2) 0.7% or less of scale length

3% or less of indication

10% or less of indication

50MΩ or more (between electric circuits and outer case)

There must not be an abnormality.
(between electric circuits and outer case)

The specifications for tolerances, friction, and the effect of tilting
must be met. There are no mechanical and electrical damage.

The specifications for tolerances, friction, and the effect of tilting
must be met. There are no mechanical and electrical damage.

There must not be an abnormality.

Central indication

<1>

<2>

0.05 to 20 M Ω 0.1 to 50 M Ω

0.01 to 0.05 M Ω
20 to 50 M Ω

0.25 M Ω

0

<2>

0.05 to 0.1 M Ω
50 to 100 M Ω

0.5 M Ω

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 for the battery (When the battery is checked,

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

Deviation from the infinity indication when the tester is tilted from
a horizontal position by 30 degrees

(1) Deviation from central indication when ambient temperature is

varied from 20
(2) Deviation from infinity and zero indications when ambient
temperature is varied from 20

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 5µF ±10% is connected in parallel to

a resistor corresponding to central indication connected

When tested at 500 V if the rated measuring voltage is 500 V or less or

at a voltage identical to the rated voltage if the rated voltage exceeds

500 V

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/s2 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

1 to 500 M Ω

0.5 to 1 M Ω

500 to 1000 M Ω

1 M Ω 2 M Ω

0.5 to 0.6 mA

the pointer must be within the BATT mark.)

°

C by ±20°C

°

C by ±20°C

2 to 1000 M Ω

1 to 2 M Ω

1000 to 2000 M Ω

0.5 to 0.6 mA

9.

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 indicator 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 scale 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 V elcro , can be
used to store the probes (Remove the probes from the tester
terminals when storing them).

10. External Dimensions

■ Optional Accessories

12. Battery Replacement

1.Loosen the batter y 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 batter y cover and tighten the
setscrew.

13. 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 f or correct
operation; ask Y okogawa M&C to do the periodic calibration for you.

YOKOGAWA M&C CORPORATION
International Sales Dept.

2-9-32 Nakacho, Musashino-shi, Tokyo, 180-8750 Japan
Phone: [phone] Facsimile: 81-422-55-8954

YOKOGAWA CORPORATION OF AMERICA (U.S.A.)

Phone: [phone] Facsimile: 1-770-251-2088

YOKOGAWA EUROPE B. V. (THE NETHERLANDS)

Phone: [phone] Facsimile: 31-334-64-1610

YOKOGAWA AMERICA DO SUL S. A. (BRAZIL)

Phone: [phone] Facsimile: 55-11-5681-1274

YOKOGAWA ENGINEERING ASIA PTE. LTD. (SINGAPORE)

Phone: [phone] Facsimile: 65-6241-2606

YOKOGAWA MEASURING INSTRUMENTS KOREA CORPORATION (KOREA)

Phone: [phone] to -0664 Facsimile: 82-2-551-0665

YOKOGAWA AUSTRALIA PTY. LTD. (AUSTRALIA)

Phone: [phone] Facsimile: 61-2-9888-1844

YOKOGAWA BLUE STAR LTD. (INDIA)

Phone: [phone] Facsimile: 91-80-227-4270

LTD. YOKOGAWA ELECTRIC (RUSSIAN FEDERATION)

Phone: [phone] Facsimile: 7-095-737-7869

KIM3E-2002.7