WARNING
CAUTION
Note
WARNING
CAUTION
WARNING
WARNING
1. Indicator window
Front view
Rear view
9. Shoulder strap
Note
WARNING
WARNING
Note
WARNING
User's
Manual
Model MY10
Insulation Resistance Tester
A cap is provided on the tip of the line probe.
Use the line probe with the cap on for safety (safety standard: EN61010-031).
Thank you for purchasing our Insulation resistance tester.
This manual describes the specications and handling precautions of the Insulation resistance tester.
Before using this product, thoroughly read this manual to understand how to use it properly.
- Model MY10-01, MY10-02, MY10-03, MY10-04, MY10-05
Contact information of Yokogawa ofces worldwide is provided on the following sheet.
PIM 113-01Z2: Inquiries List of worldwide contacts
Store this manual in an easily accessible
place for quick reference
All Rights Reserved. Copyright ©
1999, Yokogawa M&C Corporation,
2015, Yokogawa Meters & Instruments Corporation,
2017, Yokogawa Test & Measurement Corporation
Printed in China
B3
IM MY10-E
8th Edition: Oct. 2017 (YMI)
1. Safety Precautions
This product is designed to be used by a person with specialized knowledge.
When operating the instrument, be sure to observe the cautionary notes given below to ensure correct and
safe use of the instrument. If you use the instrument in any way other than as instructed in this manual,
the instrument's protective measures may be impaired.
This manual is an essential part of the product; keep it a safe place for future reference.
YOKOGAWA is by no means liable for any damage resulting from use of the instrument in contradiction to
these cautionary notes.
The following safety symbols are used on the instrument and in this manual.
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.
Indicates a hazard that may result in the loss of life or serious injury of the user unless
the described instruction is abided by.
Indicates a hazard that may result in an injury to the user and/or physical damage to
the product or other equipment unless the described instruction is abided by.
Indicates information that is essential for handling the instrument or should be noted in order to
familiarize yourself with the instrument’s operating procedures and/or functions.
High-voltage Terminal
This symbol indicates a dangerous voltage level (terminals with voltages exceeding
1000 volts must be so marked). Never touch the terminals.
Alternating Current
This symbol indicates alternating current (AC).
Double Insulation
This symbol indicates double insulation.
■ 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.
Measurement
category
O
(None, Other)
CAT II
CAT III
CAT IV
Other circuits that are not directly connected
to MAINS.
For measurements performed on circuits
directly connected to the low-voltage installation.
For measurements performed
in the building installation.
For measurements performed
at the source of the low-voltage installation.
Description Remarks
Circuits not connected to
a mains power source.
Appliances,
portable equipment, etc.
Distribution board,
circuit breaker, etc.
Overhead wire,
cable systems, etc.
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 veries if the battery voltages are within the valid ranges.
(When the battery 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 for continuous measurement over a prolonged period of time.
3. Components and Their Functions
1. Indicator window
2. MEAS key
3. BATT CHECK key
Veries if the battery voltages are within
the valid ranges.
4. Protective cover tting
5. Zero adjustment (screw)
6. ALARM LED
• Discharge feature (On → Off)
2. MEAS
3. BATT CHECK
key
key
4.
Side view
Protective
cover
fitting
5. Zero adjustment
(screw)
6. ALARM LED
8. Battery
cover
7. Battery cover
setscrew
10. Earth terminal
11. Line terminal
GUARD function is not a standard function.
guide
When lit, it indicates that a capacitive component
in the measured object remains electried 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.
1. During Measurement of Insulation Resistance
2. Immediately After Measurement of Insulation Resistance
3. During Measurement of AC Voltage
4. Probe
5. Insulation of Casing
6. The Measured Object
7. Operating Environment
8. Do Not Remove the Casing or Disassemble
■ Measurement Categories
Measurement category of the MY10
This instrument is a insulation resistance tester that can measure insulation resistance (AC voltage).
Do not use this instrument for other purpose.
Do not use the instrument if there is a problem with its physical appearance.
• A high voltage is present at the probes. Do not touch the measured object or the earth or line terminal.
• The probes or measured object may remain highly charged.
Do not touch them immediately after the completion of measurement.
• Do not press the MEAS key while measuring the AC voltages.
• Voltage that exceeds the specied limit must not be applied to terminals.
• Use the probes supplied by Yokogawa 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.
• 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.
• Turn off the power to the measured object before you begin measuring insulation resistance.
• Avoid touching any electried parts while using the tester in a location with live electricity.
Safety protectors such as rubber-insulated gloves should be worn to prevent electrical shock
when using the tester.
• Do not operate the tester in an atmosphere where any ammable or explosive gas is present.
• Do not use the tester if there is condensation on it.
Do not open the case except when replacing batteries.
Only Yokogawa service personnel are authorized to remove the casing or disassemble or
modify the instrument.
Do not attempt to repair the instrument yourself, as doing so is extremely dangerous.
When the instrument needs an internal inspection or calibration,
contact Yokogawa or the dealer from whom you purchased the instrument.
• The instrument is for domestic use (Class B) and meets the electromagnetic compatibility requirements.
• To verify the instrument's functionality, contact the tip of the earth probe and the line probe and then
press the MEAS key.
Check that the resistance indication is 0 Ω. (Check that the instrument operates normally.)
If the indication is incorrect, it may lead to possible electrical shock or personal injury.
4. Before Measurement
• 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.
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
• Conrm that the pointer is at the center of the innity sign ( );
if it is, do not press the MEAS key.
• If it is not, adjust the pointer to indicate the center of the innity sign (
) with
the zero adjustment screw using a slotted screwdriver.
4. Battery Voltage Verication
• Press the BATT CHECK key to make sure the battery voltages are within the valid ranges.
(When the battery is checked, the pointer must be within the BATT mark.)
• If the batteries are low, replace them as specied in the battery replacement section of this manual.
5. Connecting the Probes
• Plug the earth probe into the earth terminal.
• Plug the line probe into the line terminal.
5. Measuring the Insulation Resistance
5.1 Before Connecting the Probes
• 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.
5.2 Connecting the Earth Probe
• Securely connect the earth probe to the measured object’s ground line
(if the measured object is not grounded, this process may be omitted).
5.3 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.
During measurement, exercise care to prevent the lead wire of the line probe from coming into contact with
the ground, oor or any other object.
Not observing this precaution may result in a failure to measure the correct insulation resistance.
• This instrument is designed for measurement category III (CAT III).
• Do not use the instrument for measurements in location that fall under measurement category IV.
Measurement category of the Probes
Line probe (98001) With cap: 600 V CAT III Without cap: 600 V CAT II
Earth probe (98002) 600 V CAT III
5.4 After Measurement
• 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.
Main unit
Unit: mm
(approx. inch)
Cable length: approx. 1200 mm (approx. 47.24 inch)
Note
■ Locking the MEAS Key (for Continuous Measurement)
Note
WARNING
Note
Protection cover
Shoulder strap
strap guide
Protection
cover
WARNING
CAUTION
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).
The data above is typical. Nevertheless, the battery life varies depending on the operating conditions.
Check the batteries before measurement.
6. Measuring AC Voltages
• Do not press the MEAS key while measuring AC voltages. Otherwise, it may result in a failure.
• Voltage that exceeds the specied limit must not be applied to terminals.
6.1 Connecting the Earth Probe
• Securely connect the earth probe to the measured object’s
(if the measured object is not grounded, this process may be omitted).
ground line
6.2 Connecting the Line Probe
• 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.
When measuring insulation resistance, the tester can also be used to verify that there is no voltage present
at the measured object.
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
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
(for the indicator window)
fixing holes
A
B
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 xing 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 gure on the right).
• A belt on the cover which is tted with pieces of Velcro,
can be used to store the probes
Shoulder
(Remove the probes from the tester terminals when storing them).
8. Battery Replacement
• 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.
• 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, uid is likely to leak from them, resulting in
a malfunctioning of the instrument.
<Procedure>
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.
Item Limit Test condition
Response time 3 sec or less 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
Friction No friction is recognized ---
Effects of
inclination
Effect of
temperature
2% or less of the scale length Deviation from the innity indication when the tester
is tilted from a horizontal position by 30 degrees
(1) 5% or less
(2) 0.7% or less of scale length
(1) Deviation from central indication when ambient
temperature is varied from 20°C by ±20°C
(2) Deviation from innity and zero indications when
ambient temperature is varied from 20°C by ±20°C
Effect of humidity Within tolerance When the tester is left for 1 hour
with the humidity at 90% RH
Effect of external
magnetic eld
Effect of
AC component of
measuring
3% or less of indication The change of indication when an external eld of
400 A/m DC is applied in the most affected direction
10% or less of indication A change when a capacitor with 5μF ±10% is
connected in parallel to a resistor corresponding to
central indication connected
terminal voltage
Insulation
resistance
Dielectric
withstand voltage
Resistance to
vibration
50MΩ or more
(between electric circuits and
outer case)
There must not be an abnormality.
(between electric circuits and
outer case)
The specications for tolerances,
friction, and the effect of tilting
must be met.
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 VAC 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
There are no mechanical and
Resistance to
shock
electrical damage.
The specications for tolerances,
friction, and the effect of tilting
must be met.
When shock of 1000 m/s
the direction of axis of the moving part and in
a direction perpendicular to the axis
2
is applied twice in
There are no mechanical and
electrical damage.
Endurance The specications for tolerances
and friction must be met.
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
Input over-voltage
protection
There must not be an abnormality. 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
General Specications
Operation temperature and humidity: 0 to 40°C at 90% RH or less (no condensation)
Storage temperature and humidity: -10 to 60°C at 70% RH or less (no condensation)
Battery: AA-size (4), [R6]
External dimensions: Approx. 125 (W) × 103 (H) × 52.5 (D) mm
Weight: Approx. 400 g (main unit and batteries only)
Approx. 600 g
(main unit, batteries, protective cover, earth probe and line probe)
Safety standards: EN 61010-1, EN 61010-2-030, EN 61010-031
Measurement category III (CAT III) 600 V
Insulation class II,
Indoor use, altitude 2000 m or less, pollution degree 2
EMC Standard: EN 61326-1 Class B, EN 61326-2-2
EMC Regulatory Arrangement in Australia and New Zealand
EN55011 Class B Group 1
Korea Electromagnetic Conformity Standard
( 한국 전자파적합성기준 )
Effect of radiation immunity
(at the strength of radio-frequency
electromagnetic eld of 3 V/m)
Insulation resistance measurement:
1st effective measuring range: ±10% of rdg
2nd effective measuring range: ±20% of rdg
Innity and zero indications: ±1.4% or less of scale length
AC voltage measurement: ±10% of F.S.
Environmental standard: EN 50581
Monitoring and control instruments including industrial monitoring
and control instruments
■ Standard Accessories
Name Model No. Quantity
Protection cover 93013 1
Shoulder strap 99005 1
Line probe 98001 1
Earth probe 98002 1
Batteries --- 4
User’s manual IM MY10-E 1
9. Specications
Item
Rating 125 V/20 MΩ 250 V/50 MΩ 500 V/100 MΩ 500 V/1000 MΩ 1000 V/2000 MΩ
Central Indication
1st Effective
Measuring Range
2nd Effective
Measuring Range
Lower Measuring
Limit of Resistance
Rated Current 1 to 1.2 mA 1 to 1.2 mA 1 to 1.2 mA 0.5 to 0.6 mA 0.5 to 0.6 mA
AC Voltage
Measuring Range
<First and second effective measuring ranges>
Model
MY10-01 MY10-02 MY10-03 MY10-04 MY10-05
0.5 MΩ 1 MΩ 2 MΩ 20 MΩ 50 MΩ
0.02 to 10 MΩ 0.05 to 20 MΩ 0.1 to 50 MΩ 1 to 500 MΩ 2 to1000 MΩ
0.01 to 0.02 MΩ
10 to 20 MΩ
0.125 MΩ 0.25 MΩ 0.5 MΩ 1 MΩ 2 MΩ
0 to 250 V 0 to 300 V 0 to 500 V 0 to 500 V 0 to 500 V
Central indication
<1>
<2>
0.01 to 0.05 MΩ
20 to 50 MΩ
<2>
0.05 to 0.1 MΩ
50 to 100 MΩ
<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.
0.5 to 1 MΩ
500 to 1000 MΩ
1 to 2 MΩ
1000 to 2000 MΩ
■ Optional Accessories
Name Model No. Description
1. Spare probe tip for the line probe
99011 105 mm, breaker pin
(Model 98001)
2. Hard case 93015 Houses both the main unit,
the line probe and the earth probe.
3. Accessory bag B9108XA Soft case,
approx. 100 (W) 190 (H) 40 (D) mm
■ External Dimensions
125 (4.92)
52.5 (2.07)
103 (4.06)
If the breaker pin (99011) is attached on the Line probe, detach the cap from Line probe.
Line probe (98001)
Cap
Earth probe （98002）
Standard test conditions
Ambient temperature and humidity: 23 ±5°C at 45 to 75% RH
Position: Horizontal (within 5 degrees)
Inuence of external magnetic eld: Earth magnetism
Battery Voltage: Within effective range for the battery
(When the battery is checked, the pointer must be within
the BATT mark.)
Scale length: Approx. 78 mm
Tolerances under the above conditions
Resistance measurement: ±5% of reading within the 1st effective measuring range
±10% of reading within the 2nd effective measuring range
Innity and zero indications: 0.7% or less of scale length
AC voltage: ±5% of the maximum value
No-load voltage: Within 130% of the rated voltage
Short-circuit current 12 mA or less
10. 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 to do the periodic calibration for you.
IM MY10-E <P2>
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