MY40-01 - YOKOGAWA - Datasheet.Directory

What Is Insulation Resistance?

Insulation resistance represents the state of insulation of electric equipment

or circuits. It is one of the important measurement parameters in terms of

safety and security. Methods of examining the state of insulation include us-

ing a clamp-on leakage tester for live circuits. Under normal circumstances,

however, such electric equipment or circuits are shut down temporarily and

their insulation is tested with an insulation tester.

Classiﬁ cation of Applications

Applications are roughly classified into low-voltage, high-voltage and ultra-

high-voltage circuits. The table below summarizes examples of using rated

test voltages. A tester with the rated test voltage of 500 V or 100 V/250 V is

used for low-voltage circuits.

Rated test

voltage

General Electric

Equipment Electric Installations/Circuits

Insulation testing at

safe voltage levels

Insulation testing of telephone line cir-

cuits

25V

50V

Insulation testing of

telephone network

equipment and flame-

proof equipment

100 V

125 V

Insulation testing of

control equipment

Insulation testing for maintaining low-

voltage circuits or equipment handling

levels lower than 100 V

250 V

Insulation testing of

low-voltage circuits or

equipment

Insulation testing for maintaining low-

voltage circuits or equipment handling

200 V or lower levels lower than 100 V

500 V

Insulation testing of

newly installed circuits

or of circuits or equip-

ment handling levels

lower than 600 V

(general equipment)

Insulation testing for maintaining low-

voltage circuits or equipment handling

levels lower than 600 V; insulation test-

ing of circuits or equipment handling

100 V, 200 V, or 400 V levels upon

completion of installation

1000 V

Insulation testing of

circuits, equipment,

or facilities handling

levels higher than 600

V (general equipment)

Insulation testing of circuits or equip-

ment handling constantly high operat-

ing voltages (e.g., high-tension cables,

high-voltage electric equipment, and

communications equipment and elec-

tric circuits handling high voltages)

Test Methods for Low-voltage Circuits

Insulation resistance between cables of a low-voltage circuit and between

the circuit and ground is tested for each circuit that can be separated by a

switch or overcurrent breaker installed as specified by the electrotechnical

equipment standards.

The low-voltage circuit is shut down by opening the switch and insulation be-

tween cables of the circuit and between the circuit and ground is tested. If the

measured value is below the rated resistance, all shunt switches of a trunk

line are opened and insulation is tested separately for each shunt circuit.

The comparator function of the MY40 insulation tester allows for smooth

judgment when checking the insulation of electric circuits.

Methods of Scaling the 1st and 2nd Effective Measuring Ranges of

Moving-pointer Insulation Testers

Rated test voltage: 25 V

Maximum effective reading

: 5 MΩ

0.5

0.2

0.1

0.05

0.02

0.01

0.005





∞

= Central scale value

 = First effective measuring range

 = Second effective measuring

range

Maximum effective reading:

The maximum reading that is indicated on the insulation tester and falls with-

in the range with which the accuracy of the insulation tester is guaranteed.

Effective test range:

A test range or ranges, among those of the insulation tester, over which

accuracy specified in the standards is guaranteed. In moving-pointer insu-

lation testers, the range from a resistance value one-thousandth (1/1000)

the maximum effective reading to the resistance value that is nearest to

half (1/2) the maximum effective reading and equal to the maximum effec-

tive reading multiplied by 1, 2 or 5 or by any of these values multiplied by

ten (10) raised to a whole-number power, shall be referred to as a first ef-

fective measuring range. In addition, the range from the upper limit of the

first effective measuring range to the maximum effective reading and the

range from the lower limit of the first effective measuring range to the zero

(0) reading shall be referred to as second effective measuring ranges (see

the figure above). In digital insulation testers, the first and second effective

measuring ranges shall be those indicated on the insulation tester (Excerpt

from JIS C1302-2002).

Display readings Digital Analog

Applicable standard JIS C 1302

Model MY40 3213A MY10, 2406E

Effect of

AC components

A change in the reading must not exceed ±10% when a resistance calculated from the

rated measuring voltage and current is connected to the tester and a capacitance of 5

mF ±10% is connected in parallel across the resistance.

Same as to the left, except that the con-

nected resistance has the central scale

value.

Effect of temperature

A change in the reading at an ambient

temperature of 23°C must not exceed

±2% at each of the maximum, minimum,

and central scale values of the first effective

measuring range when the temperature is

changed from 23°C to 0°C or to 40°C.

A change in the reading at an ambient tem-

perature of 23°C must not exceed ±5% at

the central scale value and be no more than

±0.7% of the scale length at either the infi-

nite scale value or the zero scale value when

the temperature is changed from 23°C to 0°

C or to 40°C.

A change in the reading must not exceed

±5% at the central scale value and be no

more than ±0.7% of the scale length at ei-

ther the infinite scale value or the zero scale

value when the temperature is changed

from 20°C to 0°C or to 40°C.

Effect of humidity A change in the reading must be within the specified tolerance range when the tester is left to stand for one hour under a relative hu-

midity of 90%.

Effect of external

magnetic field

A change in the reading must not exceed ±3% (analog) and be no more than ±1.2%

(digital) at each of the maximum, minimum, and central scale values of the first effective

measuring range when an external magnetic field of 400 A/m DC is applied to the direc-

tion where the effect thereof is the most significant.

Same as to the left, except that a change at

the central scale value must be read.

Effect of inclination

A change in the infinite scale value (∞)

must not exceed ±2% of the scale length

when the tester is inclined 90° forward or

backward and leftward or rightward from

the horizontal position. Also, a change in

the reading must not exceed ±15% at each

of the maximum, minimum, and central

scale values of

A change in the infinite scale value (∞)

must not exceed ±2% of the scale length

when the tester is inclined 30° forward or

backward and leftward or rightward from

the horizontal position.

Effect of external

voltage application

No damage should be present when a 50 Hz or 60 Hz AC voltage with an amplitude 1.2

times the rated test range is applied across the test terminals for 10 seconds each time

the tester switch is turned ON and OFF. Nor should the user be subjected to any danger.

Same as to the left, except that the voltage

is applied for 10 seconds with the tester

switch turned OFF.

Effect of vibration

No structural damage should be present and a change in the reading must be within

the specified tolerance after applying a vibration frequency of 25 Hz and a displacement

amplitude width of 1 mm for 20 minutes to each of three axis directions.

No mechanical or electrical damage should

be present and the rating within the speci-

fied tolerance must be satisfied after apply-

ing a vibration frequency of 16.7 Hz and a

double amplitude of 4 mm for one hour to

each of three axis directions.

Effect of shock

No structural damage should be present and a change in the reading must be within the

specified tolerance after directly and reversely applying 1000 m/s2, 6 ms half sine-wave

shocks to the three axis directions three times each (i.e., 18 times in total).

The rating within the specified tolerance

must be satisfied after applying a shock of

1000 m/s2 to each of three directions twice

each.

Operating temperature/

humidity range

0°C to 40°C/90% RH maximum (no condensation)

Storag temperature/

humidity range

-10°C to 60°C/70% RH maximum (no condensation – batteries should be removed)

Insulation Testers General Speciﬁ cations

Two choices:

Choose an analog model if

visual recognition is of utmost

importance, or a digital model

if precise numeric recognition

is of utmost importance.

Type

A wide choice of voltage/resistance

ratings, from 25 V/5 MΩ to 1000

V/2000 MΩ

Some models have two or three ran-

ges; thus, you need not take more

than one instrument to the site.

Ratings

Each series includes a model

or models with a backlight for

working in dark places. Multi-

functional models capable of,

for example, AC voltage meas-

urement, are also available.

Functionality

Optional test probes and

probe tips are available for a

variety of test environments.

Accessories

Points on How to Choose an Insulation Tester

3 1/2-digit

LCD

Automatic discharge

Conductor resistance

measurement

Comparator function

Memory function

P.3

125V/200MΩ

250V/200MΩ

500V/2000MΩ

1000V/2000MΩ

Automatic discharge

Battery check

Automatic discharge

Battery check

P.4

P.5

P.6

3213A

Digital insulation

testers Analog insulation testers

ranges

2 & 3

ranges

Single

range

Single

range

Analog

MY40

2406E

MY10

Type Rating

Suffix Code

& Backlight

Series/

Model Display

Additional Function

External View

Page

AC Voltage

Measuring range

25V/5MΩ

50V/10MΩ

125V/20MΩ

250V/50MΩ

125V/20MΩ

250V/50MΩ

500V/100MΩ

250V/50MΩ

500V/100MΩ

1000V/2000MΩ

250V/500MΩ

500V/1000MΩ

1000V/2000MΩ

125V/20MΩ

250V/50MΩ

500V/100MΩ

500V/1000MΩ

1000V/2000MΩ

100V/20MΩ

250V/50MΩ

500V/100MΩ

500V/1000MΩ

1000V/2000MΩ

125V/20MΩ

31 (N/A)

41 (EL-illuminated)

32 (N/A)

42 (EL-illuminated)

33 (N/A)

43 (EL-illuminated)

34 (N/A)

44 (EL-illuminated)

35 (N/A)

45 (EL-illuminated)

01 (afterglow-illuminated)

02 (afterglow-illuminated)

03 (afterglow-illuminated)

04 (afterglow-illuminated)

05 (afterglow-illuminated)

41 (N/A)

42 (N/A)

43 (N/A)

44 (N/A)

45 (N/A)

46 (N/A)

01 (EL-illuminated) 0–600V

0–300V

0–600V

0–250V

0–300V

0–500V

0–150V

0–250V

0–300V

0–250V

* JIS mark has changed from 2008

Insulation Testers Selection Guide

쎲Digital model with 4 voltage/resistance ratings

쎲Multifunction

Insulation resistance, AC voltage and conductor resistance measurement

Insulation test mode: Comparator, memory, auto-hold and

discharge functions

All test modes: Live-line alarm (excluding AC voltage

measurement), battery check and automatic power-off

쎲Easy-to-view, fluctuation-free display

쎲Double-action safety mechanism

Testing Performance Specifications

The data value is fixed.

The data value is

changing.

MY40 Digital Insulation Tester

General Specifications

Comparator function:The MY40 alerts you by turning on the LOW

symbol and sounding the buzzer if the measured value is smaller than

the reference value. You can allocate as many as three user-defined

reference values to each rating. The factory-set defaults are 0.1 MΩ,

0.2 MΩ and 0.4 MΩ.

Memory function:For each rating, you can save as many as 20 meas-

urements at desired memory address numbers.

Automatic discharge function:The MY40 automatically begins dis-

charge when you turn off the MEAS switch. You can monitor the state

of discharge by checking the bar graph and make sure discharge is

complete by checking that the segment bar disappear.

Example of Extension Bar Indicator View

125V/200MΩ

250V/200MΩ

500V/2000MΩ

1000V/2000MΩ

MY40

-01

.4000

4.000

40.00

200.0

.4000

4.000

40.00

200.0

4.000

40.00

400.0

2000

4.000

40.00

400.0

2000

.1kΩ

1kΩ

10kΩ

100kΩ

.1kΩ

1kΩ

10kΩ

100kΩ

1kΩ

10kΩ

100kΩ

1MΩ

1kΩ

10kΩ

100kΩ

1MΩ

0–.0199MΩ

.0200–10.00MΩ

10.01–200.0MΩ

0–.0499MΩ

.0500–20.00MΩ

20.01–200.0MΩ

0–0.999MΩ

1.000–500MΩ

501–2000MΩ

0–1.999MΩ

2.000–1000MΩ

1001–2000MΩ

± (5%of rdg+6dgt)

± (2%of rdg+6dgt)

± 5%of rdg

± (5%of rdg+6dgt)

± (2%of rdg+6dgt)

± 5%of rdg

± (5%of rdg+6dgt)

± (2%of rdg+6dgt)

± 5%of rdg

± (5%of rdg+6dgt)

± (2%of rdg+6dgt)

± 5%of rdg

0.125MΩ

0.25MΩ

0.5MΩ

2MΩ

1mA

0.5mA

5MΩ

50MΩ

Model Rating Range

Option

Resolution

Measuring Range Tolerance

Lower Limit of

measured Ω

Rated

Current

Central Scale

Value

AC voltage measurement (45-400 Hz)

Conductor resistance measurement

Model Range

Resolution

Accuracy Input Impedance

MY40-01 600V 1V ±(2% of rdg + 6dgt) Approx. 2 MΩ

Model Range

Resolution

Accuracy

Open-circuit Voltage

MY40-01 400Ω0.1Ω±(2% of rdg + 8dgt)

Buzzer sound

resistance: <40Ω.

Product Part Number Qty

Protection cover

Shoulder strap

Line probe

Earth probe

User's manual

Batteries

93013

99005

98001

98002

–

Standard Accessories

* First effective measuring range; ** The minimum value at which the rated voltage can be maintained

125

103

52.5

Clr

Enter

Select

250V

1000V

500V

2000MΩ

200MΩ

OFF

600V MAX

125V

MEM

LIGHT

COMP

ALARM

INSULATION TESTER

1000V RELEASE

MEAS

PULL LOCK

Protection against inad-

vertent setting of rotary

switch to 1000 V rating

Standard test conditions

Ambient temperature/humidity ranges: 23 ±5:/45-75% RH

Tolerances under the above-mentioned conditions:

Deviation from zero scale value: 6 digits maximum

Indication of ∞ mark on bar graph: Approx. 4000 MΩ min. (500 V/1000 V)

Approx. 400 MΩ min. (125 V/250 V)

Open circuit voltage: 130% max. of rated voltage

Rated measuring current:

1 mA (0 to 20%) when in first effective measuring range

Short-circuit Current: 2 mA max.

Display: 3 1/2-digit LCD; 4000 count; backlight-illuminated; logarithmic

bar graph; extension bar graph–no fluctuations, as the display shows

the digits of a reading in the order in which each digit settles.

High-voltage indicators: The high-voltage symbol and LED lamp

come on to alert you when the MY40 is in insulation testing mode or if

any voltage remains to be discharged.

Live-line alarm:If you apply an AC voltage of approximately 40 V or

higher across the input terminals, the MY40 alerts you by blinking the

LED lamp and sounding the buzzer.

Overrange input alarm: If the voltage being measured exceeds 600 V

during AC voltage measurement, the MY40 alerts you by flashing the

Maximum Value indicator and sounding the buzzer.

Auto-hold function: The tester retains the measured resistance for

approximately 5 seconds after the MEAS switch is turned off.

Dimensions: 125 (W) ҂ 103 (H) ҂ 53 (D) (mm), excluding protrusions

Weight: 420 g (main unit and batteries only, excluding accessories)

Batteries: Four AA (R6P) batteries

Note: See the list of accessories on the backside of this bulletin for more information on

accessories.

B9108XA

Accessory-housing case

93015

Carrying case

(case for housing both the main

unit and accessories)

93013

Protection cover

SERIES

External Dimensions Unit: mm

Testing Performance Specifications

2406E Series of Analog Insulation Testers

SERIES

General Specifications

Product Part Number Qty

Earth and Line probes

Carrying case

User's manual

Batteries

98007

B9075MU

–

Remarks

Standard Accessories

External Dimensions Unit: mm

240631

240641

240632

240642

240633

240643

240634

240644

240635

240645

25V/5MΩ

50V/10MΩ

125V/20MΩ

250V/50MΩ

125V/20MΩ

250V/50MΩ

500V/100MΩ

250V/50MΩ

500V/100MΩ

1000V/2000MΩ

250V/500MΩ

500V/1000MΩ

1000V/2000MΩ

0.001–5MΩ

0.005–10MΩ

0.01–20MΩ

0.01–50MΩ

0.01–20MΩ

0.01–50MΩ

0.05–100MΩ

0.01–50MΩ

0.05–100MΩ

1–2000MΩ

0.1–500MΩ

0.5–1000MΩ

1–2000MΩ

0.1MΩ

0.2MΩ

0.5MΩ

1MΩ

0.5MΩ

1MΩ

2MΩ

1MΩ

2MΩ

50MΩ

10MΩ

20MΩ

50MΩ

0.025MΩ

0.05MΩ

0.125MΩ

0.25MΩ

0.125MΩ

0.25MΩ

0.5MΩ

0.25MΩ

0.5MΩ

1MΩ

0.25MΩ

0.5MΩ

1MΩ

* The minimum value at which the rated voltage can be maintained;

** 0.55 mA in the case of the first effective measuring range

0–300V

0–600V

Lower limit of

measured Ω

Model

-E

Suffix

Code

Rating

Effective

Measuring range

Central

Scale Value

AC Voltage

Measuring range

Rated Current

1mA

1mA**

Non-backlitEL-backlit

쎲Analog models with two and three ratings

쎲AC voltage measurement

쎲Automatic discharge

쎲Sky blue EL backlight

Standard test conditions:

Ambient temperature/humidity ranges: 23 ±5:/45-75% RH

Position of use: Horizontal (5° max. of angle of inclination)

External magnetic fields: None

Battery voltage: Within effective voltage range

(The pointer must stay within the range indicated by the BAT symbol

when the battery check is performed.)

Tolerances under the above-mentioned conditions:

Resistance measurement: First effective measuring range = ±5% of reading

Second effective measuring range = ±10% of reading

Infinite and zero scale values: 0.7% max. of scale length

AC voltage: ±10% of maximum scale value

No-load voltage: 130% max. of rated voltage

Rated measuring current: 1 mA (0 to 20%) when in first effective measuring range

Short-circuit current: 12 mA max.

Scale length: Approx. 86 mm (outer scale)

Discharge function: The tester automatically begins discharge when you turn off the

MEAS switch. The pointer swings if there is any residual voltage in the circuit under test.

You can make sure discharge is complete by checking that the pointer swings back to

the infinite (∞) scale value. Under this condition, the tester is ready to enter voltage

measurement mode.

AC voltage measurement: AC voltage measurement is possible wherever the rotary

switch is positioned.

Dimensions (main unit): Approx. 120 (W) ҂ 110 (H) ҂ 60 (D) (mm)

Weight: Approx. 500 g (including batteries)

Batteries: Six AA (R6P) batteries

Accessories: See the list of accessories on the backside of this bulletin for information

on accessories.

B9108XA

Accessory-housing case

B9705MU

Hard case

120

110

53 7

240631 240632 240633 240634 240635 240641

240642 240643 240644 240645

Earth probe(blake);approx. 1mlong

Line probe(vermilion);approx. 1m long

w/probe-housing

pocket and neck strap

–

Testing Performance Specifications

MY10 Series of Analog Insulation Testers

SERIES

External Dimensions Unit: mm

Lower Limit of

Measured Ω*

Model Rating Effective Measuring Range Central Scale

Value

AC Voltage

Measuring Range Rated Current

125V/20MΩ

250V/50MΩ

500V/100MΩ

500V/1000MΩ

1000V/2000MΩ

0.5MΩ

1MΩ

2MΩ

20MΩ

50MΩ

0.01–20MΩ

0.01–50MΩ

0.05–100MΩ

0.5–1000MΩ

1–2000MΩ

0–250V

0–300V

0–500V

0.125MΩ

0.25MΩ

0.5MΩ

1MΩ

2MΩ

1–1.2mA

0.5–0.6mA

MY10-01

MY10-02

MY10-03

MY10-04

MY10-05

General Specifications

MY10-01:125V/20MΩ

MY10-02:250V/50MΩ

MY10-03:500V/100MΩ

MY10-04:500V/1000MΩ

MY10-05:1000V/2000MΩ

* The minimum value at which the rated voltage can be maintained

Product Part Number Qty

Protection cover

Shoulder strap

Line probe

Earth probe

User's manual

Batteries

93013

99005

98001

98002

–

Standard Accessories

125

103

52.5

쎲Analog models with single rating

쎲AC voltage measurement

쎲Automatic discharge

쎲A wide choice of accessories

–Designed for shared use with the MY40

Standard test conditions:

Ambient temperature/humidity ranges: 23 ±5:/45-75% RH

Position of use: Horizontal (5° max. of angle of inclination)

Effect of geomagnetism: None

Battery voltage: Within effective voltage range

(The pointer must stay within the range indicated by the BAT symbol when the battery check is performed.)

Tolerances under the above-mentioned conditions:

Resistance measurement: First effective measuring range = ±5% of reading

Second effective measuring range = ±10% of reading

Infinite and zero scale values: 0.7% max. of scale length

AC voltage: ±10% of maximum scale value

No-load voltage: 130% max. of rated voltage

Rated measuring current: 1 mA (0 to 20%) when in first effective measuring range

Short-circuit current: 12 mA max.

Overall scale length:

Approx. 78 mm; afterglow-illuminated scale plate

AC voltage measurement: If any AC voltage is present across the

test terminals, the tester lets you know by pointing to an AC voltage

value and turning on the LED lamp. You can perform AC voltage

measurement with the MEAS switch turned off.

Additional functions:

• Automatic discharge function

- If the object under test remains electrified after the MEAS switch is

turned off, the tester lets you know by turning on the LED lamp. If you

leave the tester connected to the electrified object, the tester

automatically begins to discharge electricity and then finishes

discharging—the LED lamp comes on and then goes out.

- When the object under test is capacitive and electrified, the tester lets

you know by turning on the LED lamp. When left connected to the

object, the tester automatically discharges electricity, thus preventing

possible electric shock or spike noise at power-on.

• Battery check (BAT mark on the scale plate)

Battery life: Approx. 10 hours when continuously operated on manga-

nese-oxide batteries with the pointer pointing to the central scale value.

Batteries: Four AA (R6P) batteries

Dimensions: Approx. 125 (W) ҂ 103 (H) ҂ 53 (D) (mm), excluding

protrusions

Weight:

Approx. 400 g (main unit and batteries only, excluding accessories)

Compliance: EN61010-1:1993; EN61010-2-31:1995

(Overvoltage Category III, Pollution Degree 2 installations for indoor use)

B9108XA

Accessory-housing case

93013

Protection cover

93015

Carrying case

(case for housing both the main

unit and accessories)

Testing Performance Specifications

3213A Series of Analog Insulation Testers

SERIES