Hioki IR4053-10, IR4055-11, IR4056-20, IR4056-21, IR4057-50 Instruction Manual

IR4053

HIOKI IR4057B961-01

IR4055
IR4056

IR4053-10

IR4055-11

IR4056-20
IR4056-21

Instruction Manual



IR4057-50

INSULATION TESTER

May 2021 Revised edition 1

IR4057B961-01 21-05H
(IR4052C960-01)

EN

HIOKI IR4057B961-01

Model-specic functionality

HIOKI IR4057B961-01

The following functionality is available on a model-

specific basis:

: Supported –: Not supported



Models

Functionality

(As shown on instrument)

IR4053 IR4055 IR4056 IR4057-50

See

Displaying 1-minute Values – – –

Negative Voltage

Notication

Low Resistance

Measurement

PVΩ Measurement

Wireless Communications

(GENNECT Cross)

Wireless Communications
(HID function)

*: Z3210 Wireless Adapter (option) required.

IR4057B961-01

 

– –

 

–



– – –

– –

 

– –

–



p. 37

p. 40

p. 42

p. 44

*



p. 51

*



p. 55

HIOKI IR4057B961-01

Contents

HIOKI IR4057B961-01

Introduction .........................................................................1

Verifying Package Contents ..............................................1

Notations ............................................................................. 4

Safety Information .............................................................. 7

Operating Precautions ....................................................... 9

1 Overview 13

1.1 Product Overview .......................................... 13

1.2 Names and Functions of Parts ....................14

2 Preparing for Measurement 21

2.1 Replacing Batteries or Fuse ......................... 22

2.2 Using the L9788-10 Test Lead with

Remote Switch (Red) ....................................25

2.3 Installing the Z3210 Wireless Adapter

(IR4057-50 only) ............................................. 27

3 Measurement 29

3.1 Pre-measurement Inspection ....................... 29

3.2 Auto Power Save (Power-Saving Function) 30

3.3 Auto Backlight-off (Automatic Light-off

Function) ........................................................ 30

3.4 Comparator Function .................................... 31

Setting the Comparator ............................................. 32

Canceling the Comparator ........................................ 33

3.5 Insulation Resistance Measurement ........... 34

Lock Function ...........................................................35

Measuring Insulation Resistance .............................. 36

Displaying 1-minute Values (IR4057-50 only) ...........37

Voltage Characteristics of Measurement Terminals .. 38

1

2

3

4

5

6

7

Appx.

索引

i

Contents

HIOKI IR4057B961-01

3.6 Discharging Function ...................................39

3.7 Voltage Measurement ...................................40

Negative Voltage Notication Function

(IR4053 and IR4055 only) ......................................... 41

3.8 Low Resistance Measurement

(IR4056 and IR4057-50 only) ......................... 42

3.9 PV

3.10 Wireless Communications Function .......... 51

Measurement Function

Ω

(IR4053 and IR4055 only) .............................. 44

Using the GENNECT Cross

(IR4055 and IR4057-50 only) ...................................51

Excel® Direct Input Function (HID function)

(IR4057-50 only) ....................................................... 55

4 Specications 59

4.1 GeneralSpecications .................................59

4.2 BasicandAccuracySpecications .............61

4.3 Functionalityspecications ......................... 69

Power-on Options ..................................................... 70

5 Maintenance and Service 71

5.1 Troubleshooting ............................................72

Errors and status codes ............................................ 77

Appendix Appx.1

Appx. 1 Measurement Principles ..................Appx.1

Appx. 2 Operation Uncertainty ...................... Appx.2

Appx. 3 Insulation Resistance Measurements

for Solar Cell Array ...........................Appx.3

ii

Introduction

HIOKI IR4057B961-01

Introduction

Thank you for choosing the Hioki IR4053-10, IR4055-11, IR4056-20,
IR4056-21, and IR4057-50 Insulation Tester. To ensure your ability
to get the most out of this instrument over the long term, please
read this manual carefully and keep it available for future reference.
Hereinafter, the descriptions refer to models as shown on the
instrument.

Verifying Package Contents

When you receive the instrument, inspect it carefully to ensure that no
damage occurred during shipping. In particular, check the accessories,
panel switches, and connectors. If damage is evident, or if it fails to

operate according to the specications, contact your authorized Hioki
distributor or reseller. Conrm that these contents are provided.

□ Insulation Tester

IR4053, IR4055
IR4056

□ L9787 Test Lead

(IR4053-10 and IR4056-20 only)

IR4057-50

□□Instruction Manual

Operating Precautions

(0990A907)

□ LR6 Alkaline battery × 4

□ Neck strap

□ L9788-11 Test Lead Set with

Remote Switch

(IR4055-11 and IR4056-21 only)

1

2

3

4

5

6

7

□ L4930 Connection Cable Set

(IR4057-50 only)

□ L4938 Test Pin Set

(IR4057-50 only)

□ L4935 Alligator Clip Set

(IR4057-50 only)

付録索引

1

Verifying Package Contents

HIOKI IR4057B961-01

Options

The options listed below are available for the instrument. To order

an option, please contact your authorized Hioki distributor or

reseller.
Options are subject to change. Please check Hioki's website for the
latest information.

1

2

3

8

9

10

11

2

5

4

6

7

Verifying Package Contents

HIOKI IR4057B961-01

Model

L9788-11 Test Lead Set with

1

Remote Switch

9804-01 Magnet Adapter (Red)
9804-02 Magnet Adapter (Black)

2

(φ11 mm, standard screw: M6 pan
head screw)

L9787 Test Lead (1.2 m) CAT III 600 V/CAT II 600 V, 10 A

3

L9787-91 Breaker Pin CAT III 600 V, 10 A

4

L9788-10 Test Lead with Remote

5

Switch (Red)

L9788-92 Breaker Pin CAT III 600 V, 2 A

6

L9788-90 Tip Pin CAT III 600 V/CAT II 600 V, 2 A

7

L4930 Connection Cable Set

8

(1.2 m)

L4935 Alligator Clip Set CAT IV 600 V/CAT III 1000 V, 10 A

9

L4938 Test Pin Set CAT III 600 V/CAT II 600 V, 10 A

10

Z3210 Wireless Adapter

11

(for IR4057-50)

Maximum rated voltage and

maximum rated current

CAT III 600 V/CAT II 600 V, 2 A

CAT IV 1000 V, 2 A

CAT III 600 V/CAT II 600 V, 2 A

CAT IV 600 V/CAT III 1000 V, 10 A

–

1

2

3

4

5

6

7

付録索引

3

Notations

HIOKI IR4057B961-01

Notations

Safety notations

In this document, the severity levels of risk and hazard are classied

as follows.

DANGER

WARNING

CAUTION

IMPORTANT

Indicates an imminently hazardous situation that will

result in death or serious injury to the operator.

Indicates a potentially hazardous situation that may

result in death or serious injury to the operator.

Indicates a potentially hazardous situation that may

result in minor or moderate injury to the operator or
damage to the instrument or malfunction.

Indicates information or content that is particularly
important from the standpoint of operating or
maintaining the instrument.

Indicates a strong magnetic-eld hazard.

The effects of the magnetic force can cause
abnormal operation of heart pacemakers and/or
medical electronics.

Indicates prohibited actions.

Indicates the action which must be performed.

*

4

Additional information is presented below.

Symbols on the instrument

HIOKI IR4057B961-01

Indicates cautions and

hazards. When the symbol

is printed on the instrument,
refer to a corresponding
topic in the Instruction
Manual.

Indicates that dangerous
voltage may be present at
this terminal.

Indicates a instrument
that has been protected
throughout by double
insulation or reinforced
insulation.

Symbols for various standards

Notations

Indicates a grounding
terminal.

Indicates DC (Direct
Current).

Indicates AC
(Alternating Current).

Do not use in distribution
systems with voltage
higher than 660 V AC.

1

2

3

4

Indicates the Waste Electrical and Electronic Equipment
Directive (WEEE Directive) in EU member states.

Indicates that the product conforms to regulations set out by the
EU Directive.

Screen Display

The instrument screen displays the alphanumeric characters as follows.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

1 2 3 4 5 6 7 8 9 0

5

6

7

付録索引

5

Notations

HIOKI IR4057B961-01

Accuracy

Hioki expresses accuracy as error limit values specied in terms of

percentages of reading and digits.

Reading

(Displayed value)

Digits

(Resolution)

Refers to the displayed value of the measuring
instrument. The limit values of reading errors are
expressed in percent of reading (% of reading, % rdg).

Refers to the smallest change in the indication on the
digital measuring instrument, i.e., the numeral one in
the rightmost place. The limit values of digit errors are
expressed in terms of digits (dgt).

Trademarks

• The Bluetooth® word mark and logos are registered trademarks
owned by Bluetooth SIG, Inc. and any use of such marks by
Hioki E.E. Corporation is under license.
Other trademarks and trade names are those of their respective
owners.

• Microsoft Excel is either registered trademarks or trademarks of
Microsoft Corporation in the United States and other countries.

6

Safety Information

HIOKI IR4057B961-01

Safety Information

This instrument is designed to conform to IEC 61010 Safety

Standards, and has been thoroughly tested for safety prior

to shipment. However, using the instrument in a way not

described in this manual may negate the provided safety

features.

Before using the instrument, be certain to carefully read the following
safety notes:

DANGER

Mishandling during use could result in injury or death,
as well as damage to the instrument. Be certain that
you understand the instructions and precautions in
the manual before use.

WARNING

Protective gear
Performing measurement using this instrument
involves live-line work. To prevent an electric shock,
use appropriate protective insulation and adhere to
applicable laws and regulations.

1

2

3

4

5

6

7

付録索引

7

Safety Information

HIOKI IR4057B961-01

Measurement Categories

To ensure safe operation of measuring instruments, IEC 61010
establishes safety standards for various electrical environments,

categorized as CAT II to CAT IV, and called measurement categories.

DANGER

• Using a measuring instrument in an environment
designated with a higher-numbered category than
that for which the instrument is rated could result in
a severe accident, and must be carefully avoided.

• Never use a measuring instrument that lacks
category labeling in a CAT II to CAT IV measurement
environment. Doing so could result in a serious
accident.

This instrument conforms to the safety requirements for CAT III 600 V
measuring instruments.

CAT II: When directly measuring the electrical outlet receptacles of the

primary electrical circuits in equipment connected to an AC electrical
outlet by a power cord (portable tools, household appliances, etc.)

CAT III: When measuring the primary electrical circuits of heavy equipment

(xed installations) connected directly to the distribution panel, and

feeders from the distribution panel to outlets.

CAT IV:

When measuring the circuit from the service drop to the service
entrance, and to the power meter and primary overcurrent
protection device (distribution panel).

Service entrance

Service drop

8

Distribution panel

CAT IV

Power meter

Internal wiring

CAT III

Fixed installation

CAT II

T

Outlet

Operating Precautions

HIOKI IR4057B961-01

Operating Precautions

Observe the following precautionary information to ensure that the
instrument can be used safely and in a manner that allows it to

perform as described in its specications.
Use of the instrument should conrm not only to its specications,
but also to the specications of all accessories, options, batteries,

and other equipment in use.

DANGER

• For your safe operation, do not connect any test
lead to the primary of the distribution panel.

• Do not short-circuit two wires to be measured by
bringing the test leads into contact with them. Arcs
or such grave accidents are likely to occur.

• To avoid short circuit or electric shock, do not touch
the metal part of the connecting test lead tip.

• To avoid electric shock, be careful to avoid shorting
live lines with the test leads tip.

If the test lead or the instrument is damaged, there
is a risk of electric shock. Perform the following
inspection before using them:

• Before using the instrument check that the coating
of the test leads are neither ripped nor torn and that
no metal parts are exposed. Using the instrument
under such conditions could result in electric

shock. Replace the test leads with those specied

by Hioki.

• Verify that the instrument operates normally to
ensure that no damage occurred during storage

or shipping. If you nd any damage, contact your

authorized Hioki distributor or reseller.

1

2

3

4

5

6

7

付録索引

9

Operating Precautions

HIOKI IR4057B961-01

WARNING

To avoid electric shock, short circuits and damage to
the instrument, observe the following precautions:

• Check the position of the rotary switch before
taking measurements.

• Disconnect the test leads from the measuring object
before switching the rotary switch.

• Do not use the instrument with circuits that exceed

its ratings or specications. Doing so may damage

the instrument, resulting in electric shock.

• Use only the specied test leads. Use of any test

lead not specied by Hioki does not allow safe

measurements.

• To prevent electrical accidents, turn off the circuit
before connecting the test leads.

• To avoid electric shock, do not exceed the lower of
the ratings shown on the instrument and test leads.

CAUTION

• The cable is hardened under the 0°C or colder
environment. Do not bend or pull it to avoid tearing its
shield or cutting cable.

• The protection rating for the enclosure of this device
(based on EN 60529) is IP40*.

* IP40:
This indicates the degree of protection provided by the enclosure of

the device against use in hazardous locations, entry of solid foreign

objects, and the ingress of water.

4: Protected against access to hazardous parts with wire measuring 1.0 mm

in diameter.

0: The equipment inside the enclosure is not protected against the harmful

effects of water.

10

Installing the instrument

HIOKI IR4057B961-01

Installing the instrument in inappropriate locations
may cause a malfunction of instrument or may give
rise to an accident. Avoid the following locations.

• Exposed to direct sunlight or high temperature

• Exposed to corrosive or combustible gases

• Exposed to a strong electromagnetic eld or

electrostatic charge

• Near induction heating systems (such as high­frequency induction heating systems and IH
cooking equipment)

• Susceptible to vibration

• Exposed to water, oil, chemicals, or solvents

• Exposed to high humidity or condensation

• Exposed to high quantities of dust particles

Operating Precautions

WARNING

1

2

3

4

CAUTION

Do not place the instrument on an unstable table or an
inclined place. Dropping or knocking down the instrument
can cause injury or damage to the instrument.

Precautions when transporting the instrument

During shipment of the instrument, handle it carefully so that it is not
damaged due to a vibration or shock.

5

6

7

付録索引

11

Operating Precautions

HIOKI IR4057B961-01

Handling the Instrument

Persons wearing electronic medical devices such
as a pacemaker should not use the 9804-01, 9804- 02
Magnet Adapter. Such persons should avoid even
proximity to the 9804-01 and 9804-02, as it may
be dangerous. Medical device operation could be
compromised, presenting a hazard to human life.

To avoid damage to the instrument, protect it from physical
shock when transporting and handling. Be especially
careful to avoid physical shock from dropping.

Test leads

• Removable sleeves are attached to the metal pins
at the end of the test leads. To prevent a short circuit
accident, be sure to use the test leads with the sleeves
attached when performing measurements in the CAT III
measurement category. Remove the sleeves before
starting CAT II measurements. You can use the test
leads with the sleeve removed for secondary side of
the circuit breakers turned off. (See “Measurement
Categories” (p. 8))

• If the sleeves are inadvertently removed during

measurement, stop the measurement. (p. 26)

DANGER

CAUTION

CAUTION

12

1

HIOKI IR4057B961-01

Overview

1.1 Product Overview

This instrument is an insulation ohmmeter that shortens work times
associated with insulation testing. It is not designed for use on
manufacturing lines and should not be used in such applications.
For manufacturing line applications, use the ST5520 Insulation
Tester.

High-speed response

• Considerably improved response time compared to previous models.

• The instrument can be used like models with a meter needle.

Enhanced comparator function

• Can be used similarly to the continuity check with a tester due to judgment
after the start of measurement being extremely short.

• The backlight lights up in red for a FAIL judgment (defective).

Low variation in measured values

• The instrument generates little variation in measured values when used in a
typical measuring environment.

Easy-to-view display

• Backlight source is a white high-intensity LED.

• Wide viewing angle LCD

High-accuracy voltage measurement function

• The instrument incorporates a DC/AC voltmeter with the same accuracy as
a card tester.

• There is no need to switch to a card tester when you need to measure
voltage.

PVΩ measurement function (IR4053 and IR4055 only)

• Insulation resistance can be measured accurately for solar battery panel.

1

2

3

4

5

6

7

付録索引

13

Names and Functions of Parts

HIOKI IR4057B961-01

1.2 Names and Functions of Parts

Front

IR4056, IR4057-50

(p. 19, p. 22,
p. 34, p. 40)

1

(The illustration shows the IR4057-50)

Display

Top

32

4

MEASURE key (p. 16) Starts insulation resistance measurement.

1

EARTH terminal Connects the black test lead.

2

CONTROL terminal

3

LINE terminal Connects the red test lead.

4

Rotary switch Selects measurement functions.

5

LIGHT key

6

0Ω ADJ key

7

Live circuit indicator

8

14

(p. 9)

(p. 9)

1065 97 8

Controls L9788-10 Test Lead with Remote
Switch (Red)

Turns on and off the backlight.

Performs zero-adjustment for the low
resistance range.
Press with the COMP key simultaneously:

congures the wireless communications

function (p. 51) (IR4057-50)

Lights up when voltage remains between
input terminals.

COMP key

HIOKI IR4057B961-01

9

RELEASE key

10

Names and Functions of Parts

Sets the comparator’s judgment reference
value.
Press with the 0

congures the wireless communications

function. (p. 51) (IR4057-50)

Press before measurement to set the instrument
to the 500 V or 1000 V range (to prevent
erroneous application of the test signal).

ADJ key simultaneously:

Ω

1

2

IR4053, IR4055

500 V↔1000 V key

1

COMP key (1 s)

2

500 V/1000 V

3

RELEASE key

(The illustration shows the IR4055)

1 2

Switches between 500 V and 1000 V when using
PV

range.

Ω

Congures wireless communications function

(p. 51) (IR4055)

• Press before measurement to set the instrument
to the 500 V or 1000 V range (to prevent
erroneous application of the test signal).

• Applied voltage is conrmed when PVΩ range
is set.

(Other functions are the same as

IR4056 and IR4057-50.)

3

4

5

6

7

付録索引

15

Names and Functions of Parts

HIOKI IR4057B961-01

MEASURE key

MEASURE key

operation

Pull*

Description in
this manual

*: Convenient way for performing measurement repeatedly

Turn on the MEASURE key.

Press and hold

right side

Power OFF

Rotary switch
status

Fold down

(or release).

Turn off the

MEASURE key.

Description in
this manual

Turn off the rotary

16

switch.

Display

HIOKI IR4057B961-01

IR4057-50

Names and Functions of Parts

1

Bar graph

Battery indicator (three levels) (p. 29)

Turns on when the voltage measured with the V range is DC.

Turns on when the voltage measured with the V range is AC.

Blinks when the measured value is less than the minimum display
value.

Blinks when the measured value is greater than the maximum
display value.

Turns on when the measured value is retained.

Turns on when the comparator judgment is PASS (good). (p. 31)

Turns on when the comparator judgment is FAIL (defective).

(p. 31)

Blinks when a dangerous voltage exists between the
measurement terminals.

Judgment result buzzer (only when comparator is set) (p. 31)

Appears 30 s before auto power save function is activated.

(p. 30)

Turns on when zero adjustment is performed during low

resistance measurement. (p. 42)

Measured value

Comparator judgment reference value or
1-minute value

17

2

3

4

5

6

7

付録索引

Names and Functions of Parts

HIOKI IR4057B961-01

Displaying 1-minute values (p. 37)

• Turns on when 1 minute has passed since the start of insulation
resistance measurement.

• Indicates that the resistance value on the bottom of the display
is a 1-minute value (the measured value 1 minute after the start
of measurement).

Turns on when the comparator function is enabled. (p. 31)

Turns on when the instrument is set to the 500 V range or the
1000 V range.

Pressing

measurement.

Indicates wireless communications function status. (p. 51)

turns off the indicator and enables insulation

IR4056

Turns on when the reference value is indicated by the
comparator function.

Measured value
or comparator reference value

(Other functions are the same as

the IR4057-50.)

18

Names and Functions of Parts

HIOKI IR4057B961-01

IR4053, IR4055

REAR (Serial number label)

The serial number consists of nine digits. The rst two indicate the year

of manufacture (the last two digits of the Western year), and the next two
indicate the month of manufacture.

(The illustration shows the IR4055)

Measured value
or comparator reference value

(Other functions are the same as the

IR4056 and the IR4057-50.)

Turns on when the PVΩ measurement mode is selected.

Turns on when selecting 500 V range in the PVΩ measurement
mode.

Turns on when selecting 1000 V range in the PVΩ measurement
mode.

Indicates wireless communications function status. (p. 51)
(IR4055)

1

2

3

4

5

6

7

付録索引

19

Names and Functions of Parts

HIOKI IR4057B961-01

L9788-10 Test Lead with Remote Switch (Red)

CAUTION

The MEASURE key of the instrument is enabled even
when the L9788-10 is connected to an insulation
resistance tester. Note that the testing voltage is output
when the MEASURE key of the instrument is turned ON
while the L9788-10 is connected.

Refer to “Attaching the L9788-92 Breaker Pin” (p. 26)

Sleeve

Enlarged tip view

35

16

1 2 3

Plug

1.8

φ

Light

1

MEASURE key

2

Judgment display

3

3.0

φ

20

Unit: mm

Lights up interlocked with the backlight of the
instrument.

• Starts insulation resistance measurement.

• Lights up in red interlocked with the live wire
warning indicator of the instrument.

Lights up in accordance with the comparator
judgment result.

• PASS: Green

• FAIL: Red

Preparing for Measurement

HIOKI IR4057B961-01

2

CAUTION

Attach the strap securely to the four ttings on the
instrument. If insecurely attached, the instrument may fall
and be damaged when carrying.

Attach the strap.

1

Slightly extend each of the four
double-loop split rings and pass
the ring through a lug-hole on
the instrument.

Secure the strap at

4 positions.

Insert the batteries. (p. 22)

2

Connect the test leads to the terminals.

3

1

2

3

4

5

EARTH terminal

Connect the black
test lead.

Attach each test pin or alligator clip to a lead.

4

LINE terminal

Connect the red
test lead.

6

7

Fully insert the test lead to the
test pin or alligator clip.

or

付録索引

21

Replacing Batteries or Fuse

HIOKI IR4057B961-01

2.1 Replacing Batteries or Fuse

WARNING

• To avoid electric shock, turn off the MEASURE key,
disconnect the test leads from the measuring object
before replacing the battery cover.

• After replacing the batteries, reattach the cover and
secure the screw before using the instrument.

• Battery may explode if mistreated. Do not
shortcircuit, recharge, disassemble or dispose of in

re.

• Replace the fuse only with one of the specied type,
characteristics, rated current, and rated voltage. Do

not use fuses other than those specied (especially,
do not use a fuse with higher-rated current) or do

not short circuit and use the fuse holder. Doing so
may damage the instrument and result in bodily
injury.
Fuse type: FF0.5 AH/1000 V (70 172 40.0.500:

SIBA GmbH) (Fast blow, arc-extinguishing material
included, and high breaking capacity)

The fuses can be purchased via authorized Hioki
distributor or reseller. (Fuse replacement not

required for the IR4053 or IR4055)

• To prevent instrument damage or electric shock,
use only the screw for securing the battery cover
in place that are originally installed. If you have lost

a screw or nd that a screw is damaged, please

contact your authorized Hioki distributor or reseller.

22

Replacing Batteries or Fuse

HIOKI IR4057B961-01

CAUTION

Poor performance or damage from battery leakage could
result. Observe the cautions listed below.

• Do not mix old and new batteries, or different types of
batteries.

• Pay attention to the polarity markings “+” and “−”, so
that you do not insert the batteries the wrong way
around.

• Do not use batteries after their recommended expiry date.

• Do not leave depleted batteries inside the instrument.

• Replace batteries only with the specied type.

• Use batteries with low internal resistance.

• The battery indicator blinks when the remaining battery capacity

is low. In this case, measurement is not possible. Replace the
batteries with new ones. (p. 29)

• Handle and dispose of batteries in accordance with local
regulations.

1

2

3

4

5

6

7

付録索引

23

Replacing Batteries or Fuse

HIOKI IR4057B961-01

Procedure (The illustration shows the IR4056)

You will need:

• LR6 Alkaline battery ×4

• Phillips-head screwdriver (No. 2)

Turn off the rotary switch and

1

OFF

remove the test lead from the
instrument.

Rear

Battery cover

Batteries
(LR6 ×4)
Check the
polarity.

Fuse

FF0.5 AH/1000 V
(70 172 40.0.500:
SIBA GmbH)

24

Loosen the fastening screw

2

and remove the battery cover.

Replace all four batteries or

3

the fuse.

Slide the battery cover back

4

into place and tighten the
screw.

Using the L9788-10 Test Lead with Remote Switch (Red)

HIOKI IR4057B961-01

2.2 Using the L9788-10 Test Lead with

Remote Switch (Red)

Pre-measurement inspection

Turn off the rotary

1

switch.

Fully insert the L9788-10 plug

2

into the LINE terminal of the
instrument.

1

2

OFF

Set the rotary switch to insulation resistance range.

4

Turn on the MEASURE key of the L9788-10.

5

Check the red indicator of the MEASURE key of L9788-10 and display

interlocked with the live wire warning indicator of the instrument.

0 M

Ω

6

Press .

OK

Short the test lead tips each other.

3

0 M

Ω

Check that the L9788-10 tip lamp
lights up.

NO

3

4

5

6

7

付録索引

25

Using the L9788-10 Test Lead with Remote Switch (Red)

HIOKI IR4057B961-01

Replacing the Tip Pin (optional) for the L9788-10

When the tip pin of the L9788-10 Test Lead with Remote Switch
(Red) (option) is worn out or broken, it can be replaced. The tip pin
can be purchased via authorized Hioki distributor or reseller.

Turn off the rotary switch and

1

OFF

disconnect the L9788-10.

Wrench
(size: 7 mm width)

L9788-90 Tip Pin

Remove the tip pin by rotating

2

with a wrench.

Attach the new tip pin to the

3

L9788-10 by rotating with a

wrench.

(Tightening torque: 0.3 N·m)

Check the operation.

4

Measure a measuring object of known
values and use after checking that the
resistance is correct.

Attaching the L9788-92 Breaker Pin

Remove the sleeve of the L9788-10 and attach the breaker pin.

Fully insert.

L9788-92 Breaker Pin

Removing and attaching the test lead sleeves

Safely store the removed sleeves so as
not to lose them. (p. 12)

26

Installing the Z3210 Wireless Adapter (IR4057-50 only)

HIOKI IR4057B961-01

Removing the sleeves Attaching the sleeves
Hold the bottom of the sleeves
and pull the sleeves off. (For
safety reasons, the cap has been
manufactured to t snugly so that
it cannot be easily removed.)

Insert the metal pins of the test leads into
the holes of the sleeves, and rmly push
them all the way in.

1

2.3 Installing the Z3210 Wireless

Adapter (IR4057-50 only)

The wireless communications function can be used by installing the Z3210
Wireless Adapter (option) to the instrument.

WARNING

• To avoid electric shock, turn off the MEASURE
key and remove the test leads from the measuring
object before removing the battery cover.

• After installing or removing the Z3210, be sure to
reattach the battery cover and secure it in place
with the screw before using the instrument.

• To prevent instrument damage or an electric shock,
use only the screws that are originally installed for
securing the battery cover in place. If you have lost

any screws or nd that any screws are damaged,

please contact your authorized Hioki distributor or
reseller.

CAUTION

After touching any metallic part, such as a doorknob,
to eliminate static electricity from your body, connect or
disconnect the Z3210. Failure to do so could cause static
electricity to damage the Z3210.

2

3

4

5

6

7

付録索引

27

Installing the Z3210 Wireless Adapter (IR4057-50 only)

HIOKI IR4057B961-01

Procedure

You will need:

• Phillips-head screwdriver (No. 2)

• Flat-head screwdriver

• Z3210 Wireless Adapter (option)

Rear

2, 5

2

5

3

4

Turn off the rotary switch and remove the test leads.

1

Unscrew the screws and remove the battery cover.

2

Remove the protective cap with a at-head screwdriver.

3

Exercising care to orient the Z3210 correctly, install the

4

Z3210 as far as it will go.

Reattach the battery cover and tighten the screws.

5

28

Measurement

HIOKI IR4057B961-01

3

3.1 Pre-measurement Inspection

Before using the instrument, verify that it operates normally to ensure that no

damage occurred during storage or shipping. If you nd any damage, contact

your authorized Hioki distributor or reseller.

Checking the remaining battery charge

Is the battery level adequate?

Set the rotary switch away

from OFF and conrm the

battery indicator.

Turns on

Checking the test lead

Is the white portion
(insulation layer) inside
the cable exposed?

Not Exposed

1. Set the rotary switch to
insulation resistance
range.

2. Short the test lead tips.

3. Is 0 M

displayed when

Ω

the MEASURE key is
turned on?

Displayed

Blinks

Exposed

Not

displayed

Replace with the new batteries.

(p. 22)

Do not use and replace with

those specied by Hioki if

damage is present as you could
receive an electric shock.

The following issues may be
occurring:

• The test lead has not been
inserted all the way.

Insert the test lead all the way in.

→

• There is a broken connection in
the test lead.

→ Replace them with those

specified by Hioki.

1

2

3

4

5

6

7

付録索引

Inspection complete

Please read the “Operating Precautions” (p. 9) before use.

29

Auto Power Save (Power-Saving Function)

HIOKI IR4057B961-01

3.2 Auto Power Save (Power-Saving Function)

When the rotary switch is not in the OFF position, the instrument changes to
the auto power save state approx. 10 minutes after the last operation or live
wire warning indication.
To avoid battery depletion, turn off the rotary switch after use (the auto power

save consumes a small amount of current).

Canceling the auto power save

Other than

the OFF
position

.

Turn on the instrument while
holding down

Recovering from auto power save state

Set the rotary switch to OFF and then return it to its original
position.

3.3 Auto Backlight-off (Automatic Light-off Function)

The backlight of the instrument will automatically turn off after approx.
3 minutes has passed since the last operation.
The automatic light-off function can be canceled when working continuously
in a dark location.

Canceling the automatic light-off function

Backlight: OFF

Press for approx. 2 seconds.

30

Continuous
short beep

Set the rotary switch to any
position other than OFF.
With the backlight off, press
for approx. 2 seconds until the
instrument beeps.

The automatic light-off function is enabled
setting the rotary switch to OFF.

.

by

Comparator Function

HIOKI IR4057B961-01

3.4 Comparator Function

This function compares the measured value with the preset value and judges

whether the result is PASS (good) or FAIL (defective).

Comparator settings for each range will be saved, even if the rotary switch is
turned off.
See the table on the next page for criteria that can be set.

Indication lights up

PASS (good) judgment FAIL (defective) judgment

LED

display

Backlight:

No change

* When using the L9788-10 Test Lead with Remote Switch (Red)

Type of measurements that can be judged

Function

Insulation

Resistance

Low resistance

PV

Ω

Voltage Comparator cannot be set.

Lights up in

green*

PASS judgment FAIL judgment

State of

measured

value

Criterion or

higher

Criterion or

lower

Criterion or

higher

Backlight: Lights

up in red

Buzzer Backlight Buzzer

Short beep

Long beep Short beep

Short beep Long beep

Lights up in

red

Lights up in

red*

Long beep

1

2

3

4

5

6

7

付録索引

31

Comparator Function

HIOKI IR4057B961-01

Setting the Comparator

Select a judgment reference from the table below.

1

Range Reference value Unit

0.01 0.02 0.03 0.04 0.05

50 V

125 V

250 V

500 V/PV

1000 V*

500 V

Ω

3

/PVΩ 1000 V

Ω

*1: Factory default setting

*2: Factory default setting when PV

*3: Reference values 0.1 to 0.5 are only for models IR4053 and IR4055.

0.1 0.2 0.3 0.4 0.5 ‒

1

2 3 4 5 ‒

1*

10 ‒ ‒ ‒ ‒ Off

0.1 0.2 0.3 0.4 0.5 ‒

1

2 3 4 5 ‒

1*

10 20 ‒ ‒ ‒ Off

0.1 0.2 0.3 0.4 0.5 ‒

1

2 3 4 5 ‒

1*

10 20 30 40 50 Off

0.1 0.2*
1*

2

1

0.3 0.4 0.5 ‒

2 3 4 5 ‒

10 20 30 40 50 ‒

100 ‒ ‒ ‒ ‒ Off

0.1 0.2 0.3 0.4*
1 2 3 4 5 ‒

1

20 30 40 50 ‒

10*

2

0.5 ‒

100 200 300 400 500 Off

0.1 0.2 0.3 0.4 0.5 0.6
1 2 3 4 5 6

1

10 20*

30 40 50 60

100 200 ‒ ‒ ‒ Off

function is selected.

Ω

M

Ω

Ω

32

Comparator Function

HIOKI IR4057B961-01

Set the rotary switch to the range for which you wish to set

2

the judgement reference.

Range Operation

500 V

1000 V

PV

Ω

or

COMP REF

2

Press

Press to select the applied voltage and press to

release the lock.

4

to release the lock.

Press .

3

Blinks

3

[COMP] or [REF] blinks and the

resistance value that will be used as
the judgement reference is displayed.

IR4053, IR4055, IR4056: REF

IR4057-50: COMP

Press or to select the

4

judgement reference.

If there is no operation for about 2

seconds after you select the judgment
reference, the comparator will be set,
and [COMP] or [REF] will light up.

Canceling the Comparator

oFF

Press several times to select

[oFF].

If there is no operation for for about 2

seconds after you select, [COMP] or [REF]
will go off, and the comparator function will
be canceled.

1

2

3

4

5

6

7

付録索引

33

Insulation Resistance Measurement

HIOKI IR4057B961-01

3.5 Insulation Resistance Measurement

The instrument is used to measure the insulation resistance to
determine the insulation performance of circuits and equipment.
Before starting a measurement, the voltage to be applied to the
measuring object needs to be selected.

WARNING

Observe the following to avoid electric shock, short
circuit, or damage to the instrument.

• Do not attempt to measure insulation resistance
on a live conductor. Doing so could damage the
instrument or cause an accident that might result
in injury or death. Always turn off power to the
measuring object before starting.

• When measuring insulation resistance, dangerous
voltage is applied to the measurement terminals. To
avoid electric shock, do not touch the metal part of
the test leads.

• Do not touch the measuring object immediately after
measurement. Doing so may cause electric shock
due to a highly charged voltage.

• Discharge the measuring object with the discharge

function of the instrument after a measurement. (p. 39)

• Insulation resistance is the ratio of applied voltage to leakage current.
Displayed value may not stabilize depending on the measuring object,
but it is not a failure of the instrument.

• Press the MEASURE key fully down until a live circuit indicator lights
up. If the button is not pressed down fully, a proper measurement cannot
be made.

• Turn off the rotary switch after use.

• Disconnection when measuring is recommended of any equipment
having a lower withstanding voltage than the test voltage, or equipment
or parts having an unknown withstanding voltage connected to the circuit
to be measured.

34

Insulation Resistance Measurement

HIOKI IR4057B961-01

Lock Function

This function is used to avoid applying high voltage such as 500 V
or 1000 V to equipment having a lower withstanding voltage. This
function will prevent the test voltage from being output even if the

MEASURE key is pressed while the rotary switch is set to the 500

V or PVΩ range.

1000

Releasing the lock

1

V,

2

or

1

or

The screen is locked 1 minute after the last measurement or operation
again.

Turns on

Blinks

Turns off

2

Turns off

Set the rotary switch to the

1

500 V, 1000 V or PVΩ range.

Press .

2

Pressing this key unlocks the
instrument and switches to the
measurement screen.

3

4

5

6

7

付録索引

35

Insulation Resistance Measurement

HIOKI IR4057B961-01

Measuring Insulation Resistance

CAUTION

To avoid electric shock, turn off the measuring line
breaker.

Example: When measuring the insulation resistance between the circuit

2

5
7

3

4

5

6

and the ground

Turn off the MEASURE key.

OFF

1

ON

OFF

6

Connect the black test lead to the ground side of the
object being measured.

Connect the red test lead to the measuring object.

If there is any remaining voltage on the measuring object, red and white
blink alternately on the backlight.

Press and hold the MEASURE key.

To make continuous measurements, pull up the MEASURE key. (p. 16)

Check the value after the indicator has stabilized.

1

Set the rotary switch to a test voltage

2

of 50 V to 1000 V.

In the 500 V or 1000 V range, press to

release the lock. (p. 35)

3

Source (primary side)

OFF

4

Load (secondary side)

36

Insulation Resistance Measurement

HIOKI IR4057B961-01

Turn off the MEASURE key with the test leads connected

7

to the measuring object.

The last measured values and are displayed and starts

discharging. (p. 39)

• Do not switch the function to other function or rated voltage when the
measurement is in progress.

• The instrument will return to the locked state when about 1 minute of no
operation elapses during measurement in the 500 V and 1000 V ranges. To

continue measurement, release the lock. (p. 35)

1

2

Displaying 1-minute Values (IR4057-50 only)

This function is only available on the IR4057-50.

The function cannot be used if the comparator function has been

enabled. Disable the comparator function before use. (p. 33)

This function automatically retains the measured value (1-minute

value) 1 minute after the start of measurement (after the MEASURE
key is turned on). Use this function when measuring a object such

as a cable that includes a capacitance component.

• No value is shown if less than 1 minute has
elapsed since the start of measurement.

Retained measured value

3

4

5

6

7

付録索引

37

Insulation Resistance Measurement

HIOKI IR4057B961-01

Voltage Characteristics of Measurement Terminals

1200

1000

800

600

400

200

Voltage generated [V]

100

0

0.05 0.12 5

0 0.1 0.25 0.5 1 10 100 1000

Resistance of measuring object [MΩ]

Rated 1000 V

Rated 500

Rated 250

Rated 125

V

Rated 50

∞

V

V

V

38

Discharging Function

HIOKI IR4057B961-01

3.6 Discharging Function

After measurements are completed, discharge the measuring object.
When objects with capacitance component are measured, a charge
equivalent to the rated measurement voltage remains in the object
that may cause electric shock.
When measuring a solar panel,
the instrument will continue to detect the panel’s voltage once
discharging ends.

mark may not disappear since

1

2

OFF

Discharging

Discharged

Turned on

Off

Without removing the test leads
from the measuring object, turn off
the MEASURE key.

The built-in discharge resistor
automatically discharges the item.

In the IR4057-50, the bar graph level

decreases according to discharge.
However, measuring objects with smaller
capacitance component discharge quickly
and the bar graph level may not change.

When the discharge is completed,

mark is turned off.

The time required for discharge depends
on the capacitance value.

39

3

4

5

6

7

付録索引

Voltage Measurement

HIOKI IR4057B961-01

3.7 Voltage Measurement

This instrument can measure the AC voltage and DC voltage of
commercial power. The instrument can check to ensure that the
measuring object is not live before measuring insulation resistance.

• During measuring, do not switchover to other functions.

• For waveforms other than sine waves, some errors may occur.

• Displayed values can frequently uctuate due to induction
potential even when no voltage is applied. This, however, is not a
malfunction.

Example: When measuring the voltage between the circuit and ground

Earth

2

Line

4

Source

(primary side)

3

Load
(secondary side)

1

Set the rotary switch to V.

1

Connect the black test lead to the earth side of the object

2

being measured.

Connect the red test lead to the line side of the breaker.

3

Check the value after the indicator has stabilized.

4

40

Always connect the test lead
to the secondary side of the
breaker.

Voltage Measurement

HIOKI IR4057B961-01

Negative Voltage Notication Function (IR4053 and

IR4055 only)

This function is only available on the IR4053 and the IR4055.
You can check whether P and N are connected in reverse while
measuring the open voltage of solar battery string.

Set the rotary switch to V

1

while pressing

The [‒] and [V] blinks and [ON] or

1 2

Press to switch between ON and OFF.

2

ON

(Factory setting)

OFF Disabled

If there is no operation for approx. 2 seconds after ON or OFF
is selected, the setting is conrmed, and the screen changes to

measurement screen.

When the voltage is −1 V or lower, red and white

of the backlight blinks alternately.

[OFF] is displayed.

.

1

2

3

4

5

6

7

付録索引

41

Low Resistance Measurement (IR4056 and IR4057-50 only)

HIOKI IR4057B961-01

3.8 Low Resistance Measurement (IR4056 and IR4057-50 only)

This function is only available on the IR4056 and the IR4057-50.

WARNING

Do not measure under a live circuit condition.

CAUTION

• If active circuits are connected to the measuring object
circuit in parallel, the impedance and transient current of
the parallel circuit could cause measurement errors.

• Auto range selection may not operate in a stable
manner depending on the measuring object (for

example, a motor, transformer, or coil).

• The instrument may not be able to obtain an accurate
measured value if there is a capacitance component in
parallel with the measuring object.

The comparator function can be used during low resistance

measurement. See “3.4 Comparator Function” (p. 31)

For accurate measurements, be sure to perform zero adjustment
before measuring, to cancel the wire resistance of the test leads.

Zero adjustment can be performed with readings of up to a
maximum of 3

[Err 0ΩADJ] will be displayed, and zero adjustment will not be

possible. Wire the instrument so that the wiring resistance is 3
less.

In the following circumstances, repeat the zero adjustment procedure:

• After changing test leads

• When the ambient temperature changes by 1°C or more

• After replacing the fuse

42

. When the reading exceeds 3

Ω

, [Err 1] or

Ω

or

Ω

Low Resistance Measurement (IR4056 and IR4057-50 only)

HIOKI IR4057B961-01

Example: Checking continuity of grounding wire

2

ON

3

OFF

4

1

5

ON

7

OFF

8

Connect the test lead to the measuring object.

6

Press and hold the MEASURE key to check the displayed

7

value.

To make continuous measurements, pull up the MEASURE key.

Turn off the MEASURE key after measurement.

8

6

Set the rotary switch to the Ω.

1

Short circuit the tip of the test

2

lead.

Turn on the MEASURE key.

3

Turn off the MEASURE key to

4

retain the measured value.

Press .

5

Do not measure
live wires.

6

1

2

3

4

5

6

7

付録索引

43

PVΩ Measurement Function (IR4053 and IR4055 only)

HIOKI IR4057B961-01

3.9 PVΩ Measurement Function (IR4053 and IR4055 only)

This function is only available on the IR4053 and the IR4055.
This function allows accurate insulation resistance measurements

between the solar panel and ground without any inuence from

power generation. For measurements between the coupling box
output terminals and ground or between power conditioner and
ground, use the normal insulation resistance range.

See “Appx. 1 Measurement Principles” (p. Appx.1)

DANGER

Do not cause a short-circuit between another wire and
the wire to be measured with the test leads. Arcs or
such grave accidents are likely to occur.

WARNING

Observe the following to avoid electric shock,
shortcircuit, or damage to the instrument.

• When measuring insulation resistance, dangerous
voltage is applied to the measurement terminals. To
avoid electric shock, do not touch the metal part of
the connecting test leads.

• Check that the connection of the measurement
terminals has been secured. If the terminal is loose,
the contact resistance will increase, resulting in

overheating, equipment burnout, or re.

• Do not touch the measuring object immediately after
measurement. A highly charged voltage may cause
electric shock.

• Discharge the measuring object with the discharge

function of the instrument after a measurement. (p. 39)

44

PVΩ Measurement Function (IR4053 and IR4055 only)

HIOKI IR4057B961-01

WARNING

Observe the following to avoid electric shock, short
circuit, or damage to the instrument.

• Turn off any disconnector devices and separate
from the power conditioner before starting the
measurements for the solar battery panel.

• Do not attempt to measure insulation resistance
on a live conductor. Doing so could damage the
instrument or cause an accident that might result
in injury or death. Always turn off power to the
measuring object before starting.

• Photovoltaic cells produce electricity continuously
during daylight hours, resulting in hazardous
voltages. Exercise care during measurement to
avoid electric shock.

• Do not touch any metal parts such as connection
box and disconnector devices directly with bare
hands. Doing so may cause electric shocks due to
the voltage of the generator.

• Maximum rated voltage between terminals of the
IR4053 and IR4055 is 1000 V DC/600 V AC. Do not
use the instrument for equipment with rated voltage
over 1000 V DC or 600 V AC. Doing so may cause
electric shock or failure.

• If the solar battery panel has failed, do not perform
any insulation resistant measurement. Doing so
may damage the bypass diode of the solar battery
panel.

1

2

3

4

5

6

7

付録索引

45

PVΩ Measurement Function (IR4053 and IR4055 only)

HIOKI IR4057B961-01

• Insulation resistance is the ratio of applied voltage to leakage
current. Displayed value may not stabilize depending on the
measuring object, but it is not a failure of the instrument.

• Press the MEASURE key fully down until a live circuit indicator
lights up. If the button is not pressed down fully, a proper
measurement cannot be made.

• Turn off the rotary switch after use.

• Disconnection when measuring is recommended of any
equipment having a lower withstanding voltage than the test
voltage, or equipment or parts having an unknown withstanding
voltage connected to the circuit to be measured.

• The ground capacitance of the solar battery panel is high,
therefore the measured values may take some time to stabilize.

• Accurate measurements are not possible when open voltage

of the solar battery string is higher than the test voltage. Use

the PVΩ 500 V range for open voltage 500V or less and PVΩ
1000 V range for open voltage 1000 V or less.

• If a voltage higher than the test voltage is detected, the buzzer
sounds and measurement is not possible.

• Use an insulation resistance range other than PVΩ to perform
measurements by shorting P and N.

• Perform measurements by shorting P and N when the solar
battery panel is not generating power, such as during the night.

• For the PVΩ measurement function, the output voltage is
divided by the 1 MΩ resistor and the resistor connected
between measurement terminals because a 1 MΩ current
limiting resistor is connected to the EARTH terminal.
Example: When a 10 MΩ resistor is measured, the voltage is

divided by 1 MΩ and 10 MΩ.

46

PVΩ Measurement Function (IR4053 and IR4055 only)

HIOKI IR4057B961-01

The method to measure the insulation resistance between the solar
battery panel and ground without shorting P and N will be explained.
See “Appx. 3 Insulation Resistance Measurements for Solar Cell

Array” (p. Appx.3)

Measurement preparation 1

Turn off the main switch of the connection box to be

1

disconnected from the power conditioner.

Turn off all the disconnector devices of the strings.

2

Disconnect lightning arresters from the measuring circuit.

3

Disconnection is not required for the gure (solar generator facility)

shown below because a lightning arrester is not present at the string
side of the disconnector device.

String

OFF

2

Disconnector devices

Lightning

arrester

OFF

1

Main switch

Connection

box

Power

1

2

3

4

5

Conditioner

Measurement preparation 2

OFF

1

2

(Example: Solar generator facility)

Check that the MEASURE key is

1

turned off.

If the MEASURE key is on, turn it off.

(p. 16)

Set the rotary switch to PVΩ.

2

Press to set 500 V or 1000 V

3 4

3

as the test voltage.

Press to release the lock.

4

6

7

付録索引

47

PVΩ Measurement Function (IR4053 and IR4055 only)

HIOKI IR4057B961-01

Start Measuring

WARNING

Observe the following to avoid damage to the
measuring object.

• If the insulation has deteriorated between the
terminal P and the ground, do not measure between
the terminal N and the ground.

• Connect the red test lead to the string side of the
disconnector device.

Power conditioner, main switch

5

P terminal

(Black)

Ground
terminal

6

Disconnector devices

Connect the black test lead to the ground terminal.

5

Connect the red test lead to the terminal P of the string side.

6

If a voltage is detected between the P and the ground terminals, the
insulation may have deteriorated. When there is a voltage on the
measuring object, the voltage detection function makes the backlight
light in red and white alternately.

48

(Red)

N terminal

String

PVΩ Measurement Function (IR4053 and IR4055 only)

HIOKI IR4057B961-01

Power conditioner, main switch

(Black)

ON

7

OFF

9

Press and hold the MEASURE key.

7

To make continuous measurements, pull up the MEASURE key.

Do not remove any test leads from the terminals until the resistance is

displayed. Doing so results in incorrect measurements. (p. 72)

Check the resistance displayed after approx. 4 seconds.

8

Subsequently, the resistance will be updated every second.

If there is any deteriorated insulation and the resistance is lower than
the reference value, do not measure the terminal N of procedure 10.
Doing so may damage the solar battery panel. Check the reference
insulation resistance with safety regulations.

Turn off the MEASURE key.

9

If the MEASURE key is on, turn it off. (p. 16)

Discharge starts and the

cleared even if the discharge is completed because a voltage is
generated by the solar battery.

When measuring terminal P and insulation has not

10

deteriorated, connect the red test lead to the terminal N
of the string side and repeat the procedures 7 to 9.

Ground
terminal

(Red)

String

mark blinks. The mark may not be

P terminal

Disconnector devices

10

N terminal

1

2

3

4

5

6

7

付録索引

49

PVΩ Measurement Function (IR4053 and IR4055 only)

HIOKI IR4057B961-01

After Measurements

After measuring insulation resistance for all the strings,

1

remove the black test lead from the ground terminal.

Reconnect the lightning arrester connection if

2

disconnected.

Turn on all the disconnector devices of the strings.

3

Turn on the main switch of the connection box.

4

1 minute after the last measurement or operation, the
turns on and the 500 V/1000 V RELEASE key blinks. Press the key
to release the lock.

50

Wireless Communications Function

HIOKI IR4057B961-01

3.10 Wireless Communications Function

Using the GENNECT Cross (IR4055 and IR4057-50 only)

This function cannot be used at the same time as the HID function.

(p. 55)

When the wireless communications function is enabled, you can
review measurement data and create measurement reports on
mobile devices. For details, see the Help function in the GENNECT

Cross (application software, free of charge).

GENNECT Cross Ofcial Website

https://gennect.net/en/cross/index

(IR4057-50 only) Install the Z3210 Wireless Adapter (option)

1

to the instrument. (p. 27)

Install the GENNECT Cross on your mobile device.

2

Turn on the IR4055 or

3

IR4057-50 to enable the
wireless communications
function.

mark or mark

On: Enabled
Off: Disabled
Blinks: Communicating

Launch the GENNECT Cross and pair it with model IR4055

4

or IR4057-50. (p. 52)

IR4055

COMP key

1 s

IR4057-50

0Ω ADJ key

+

COMP key

1

2

3

4

5

6

7

付録索引

51

Wireless Communications Function

HIOKI IR4057B961-01

Select the standard

5

measurement function and
start measurement.

• The communication distance is approx. 10 m (line of sight). The
distance over which data can be sent and received varies greatly
depending on whether there are any obstructions between the

paired instruments (for example, walls, metal barriers, etc.) and
on the distance between the instrument and the oor (or ground).

To ensure stable communication, verify adequate signal strength.

• Although the GENNECT Cross is provided free of charge,
downloading or using the application software may incur Internet
connection charges. Such charges are the sole responsibility of
the user.

• The GENNECT Cross is not guaranteed to operate on all mobile
devices.

• The Z3210 uses 2.4 GHz band wireless technology. It may not be
possible for the device to establish a wireless connection when
used in the vicinity of other devices that use the same frequency

band, for example Wi-Fi devices (IEEE 802.11.b/g/n).

52

Pairing the App

HIOKI IR4057B961-01

Wireless Communications Function

1

1

Home>Other

• When the app is launched for the rst
time (before being paired with any

instrument), the connection setup

screen will be displayed.

• While the mobile device is displaying
the connection setup screen, simply
move it close to the IR4055 or the

IR4057-50 to automatically pair it with

the instrument (the app can be paired

with up to 8 instruments).

• Allow about 5 to 30 seconds for the
instrument to pair with the app after
being turned on. If the instrument
fails to pair within 1 minute, relaunch
GENNECT Cross and cycle the
instrument’s power.

• Instruments that have been registered
do not require to be registered again.

2

Instrument

Settings

3

The instrument is

automatically registered.

Returns to the

4

screen.

Home

2

3

4

5

6

7

付録索引

53

Wireless Communications Function

HIOKI IR4057B961-01

Making Measurements with the Wireless
Communications Function

On the home screen, select the standard measurement function from
the options, standard measurement, logging and waveform display, to
start a measurement. For more information about each function, see
the help function in the GENNECT Cross.
The values displayed by the instrument may be different from the
values displayed by the application software due to communication
delays or differences in the update timing.

Standard measurement

Measured values of multiple channels
are saved.

54

Wireless Communications Function

HIOKI IR4057B961-01

Excel® Direct Input Function (HID function) (IR4057-50 only)

This function cannot be used at the same time as GENNECT Cross

(p. 51).
The human interface device (HID) prole, with which the Z3210
Wireless Adapter is equipped, is a prole same as that wireless

keyboards use.

HID ON Preparatory to data entry, open an Excel® le on

your mobile device or computer and choose a cell.
Freezing the instrument’s display can enter the
measured values on the cells.

HID OFF Select this setting when using GENNECT Cross.

The setting whether the HID function has been enabled or disabled

will not be saved in the instrument but in the Z3210.

Enter measured values.

Measured value input method

Insulation resistance, low resistance:

Press and release the MEASURE key.

Voltage: Press the MEASURE key.

1

2

3

4

5

6

7

付録索引

55

Wireless Communications Function

HIOKI IR4057B961-01

Checking and changing the HID setting

Set the rotary switch to OFF.

1

Install the Z3210 Wireless Adapter (option) to the

2

instrument.

See “2.3 Installing the Z3210 Wireless Adapter (IR4057-50 only)”
(p. 27)

If the wireless communications function is off, you won’t be able to check or

change the HID setting. Enable the wireless communications function rst
before attempting to check or change the HID setting (Step 3 on p. 51).

Check the HID setting.

3

Turn on the instrument while holding down the RELEASE key to display
the serial number screen.
Press and hold the RELEASE key for at least 3 s to display the HID

setting saved by the Z3210.

or

To leave the HID setting unchanged

Set the rotary switch to OFF.

To change the HID setting

Proceed to Step 4.

If the instrument beeps and the display doesn’t change

Using GENNECT Cross (Ver. 1.8 or later), update the Z3210 to the latest

version.

Change the HID setting.

4

Toggle the HID setting on and off by pressing the 0

COMP key.

Accept the setting

5

Press the RELEASE key to accept the HID setting. The instrument will
automatically turn off.

56

ADJ key or the

Ω

Wireless Communications Function

HIOKI IR4057B961-01

IMPORTANT

To switch from the HID function to GENNECT Cross

If you launch GENNECT Cross without unpairing the mobile phone and
the instrument, the application may fail to recognize the instrument as a
connected device.
Reconnect the instrument to GENNECT Cross as follows:

1. Delete the instrument from your device’s Bluetooth

2. Turn off the Z3210’s HID function. (p. 56)

3. Reconnect the instrument using GENNECT Cross’s connected device
settings.

®

settings.

1

2

For details, please check the Z3210’s website.
https://z3210.gennect.net

3

4

5

6

7

付録索引

57

Wireless Communications Function

HIOKI IR4057B961-01

58

Specications

HIOKI IR4057B961-01

4

4.1 General Specications

Operating
environment

Operating
temperature
and humidity

Storage
temperature
and humidity

Dustproof and
waterproof

Drop proof On concrete: 1 m

Indoors, Pollution Degree 2,
altitude up to 2000 m (6562 ft.)

• IR4053, IR4055
0°C to 40°C (32°F to 104°F), 90% RH or less (no
condensation)
40°C to 50°C (104°F to 122°F), at 50°C and below
relative with linear decrease up to 50% RH (no
condensation)

• IR4056, IR4057-50

−25°C to 40°C (−13°F to 104°F), 90% RH or less (no

condensation)
40°C to 65°C (104°F to 149°F), at 65°C and below
relative with linear decrease up to 25% RH (no
condensation)

IR4053, IR4055 IR4056, IR4057-50

• IR4053, IR4055

−10°C to 50°C (−13°F to 122°F),

90% RH or less (no condensation)

• IR4056, IR4057-50

−25°C to 65°C (−13°F to 149°F),

90% RH or less (no condensation)

IP40 (EN 60529)

1

2

3

4

5

6

7

付録索引

59

General Specications

HIOKI IR4057B961-01

Standards

EMC:

EN 61326

Safety: EN 61010

EN 61557-1
EN 61557-2
EN 61557-4*
EN 61557-10*

Insulation resistance testers: JIS C 1302*

1 *2

2

3

*1: Subclause 4.3 of Part 4 (Interchanging of test leads) is not applicable

when model L9788-10 is used.

*2: The IR4053 and the IR4055 are not applicable.

*3: IR4053 and IR4055 only

Power supply LR6 Alkaline battery ×4

Rated supply voltage: 1.5 V DC ×4
Maximum rated power: 3 VA

Continuous
operating time

When using four
LR6 Alkaline
batteries
(reference value

Approx. 20 hours (without Z3210 installed, comparator
off, backlight off, measured with measurement terminal
open at 500 V range)
Approx. 15 hours (with Z3210 installed, using wireless
communications, comparator off, backlight off, measured
with measurement terminal open at 500 V range)

at 23°C)

Dimensions
(excluding
protrusions)

Mass (including
battery,

Approx. 159W × 177H × 53D mm

(6.26″W × 6.97″D × 2.09″D)

• IR4053, IR4055, IR4056: Approx. 600 g (21.2 oz.)

• IR4057-50: Approx. 640 g (22.6 oz.)

excluding test
lead)

Product warranty period: 3 years

Fuse
(Replacements)

FF0.5 AH/1000 V (70 172 40.0.500: SIBA GmbH)
(Very fast-blow, arc-extinguishing material included, high
breaking capacity) (IR4056 and IR4057-50 only)

Accessories See “Verifying Package Contents” (p. 1)

Options See “Options” (p. 2)

60

Basic and Accuracy Specications

HIOKI IR4057B961-01

4.2 Basic and Accuracy Specications

Measurement item Insulation Resistance measurement:

Maximum rated
voltage to terminal

Maximum rated
voltage to earth

Rated operational
conditions

Nominal circuit
voltage*

Accuracy guarantee
conditions

DC voltage supply, current detection

Low resistance measurement:

DC current supply, voltage detection
(IR4056 and IR4057-50 only)

Voltage measurement:

Automatic DC/AC detection

AC voltage measurement rectication method:
Mean rectication RMS value indication

measurement:

PV

Ω

DC voltage supply, current detection
(IR4053 and IR4055 only)

600 V AC/DC (Voltage measurement)
600 V AC/1000 V DC (Voltage measurement,
IR4053 and IR4055 only)

600 V AC/DC, Measurement Category III,
Anticipated Transient Overvoltage: 6000 V

Position: Standard position ±90°

External magnetic eld: 400 A/m or less

Battery voltage: Available effective battery voltage

600 V AC/DC max.
*: The nominal circuit voltage refers to the nominal

voltage of an electric distribution circuit that
can be measured by the instrument (based on
EN 61557).

Accuracy guarantee period: 1 year
Accuracy guarantee period after adjustment
made by Hioki: 1 year
Accuracy guarantee temperature and humidity
range: 23°C±5°C (73°F±9°F), 90% RH or less
Position: Standard position ±5°

External magnetic eld: None (Earth’s magnetic
eld)

Battery voltage: Available effective battery voltage

1

2

3

4

5

6

7

付録索引

61

Basic and Accuracy Specications

HIOKI IR4057B961-01

Insulation Resistance Measurement

Rated

measurement

50 V 125 V 250 V 500 V 1000 V

voltage (DC)

Effective maximum

displayed value

Medium displayed

value

1st effective

measuring

range [M

Accuracy

(Tolerance)

2nd effective

measuring range

]

[M

Ω

Accuracy

(Tolerance)

Other measuring

range [M

Accuracy

(Tolerance)

100 M

Ω

2 M

Ω

0.200 to

10.00

]

Ω

10.1 to

100.0

]

Ω

250 MΩ500 MΩ2000 MΩ4000 M

5 M

0.200 to

25.0

IR4056, IR4057-50: ±2% rdg ±2 dgt

25.1 to
250

IR4053 and IR4055: ±8% rdg

IR4056, IR4057-50: ±5% rdg

10 M

Ω

0.200 to

50.0

IR4053, IR4055: ±4% rdg

50.1 to
500

0 to 0.199

±2% rdg ±6 dgt

50 MΩ100 M

Ω

0.200 to

501 to

2000

0.200 to

500

1010 to

Ω

Ω

1000

4000

62

Basic and Accuracy Specications

HIOKI IR4057B961-01

Insulation Resistance Measurement (continued)

Display range 1 M

Maximum

displayed value

Resolution 0.001 MΩ0.001 MΩ0.001 MΩ0.001 MΩ0.001 M

Display range 10 M

Maximum

displayed value

Resolution 0.01 MΩ0.01 MΩ0.01 MΩ0.01 MΩ0.01 M

Display range 100 MΩ100 MΩ100 MΩ100 MΩ100 M

Maximum

displayed value

Resolution 0.1 MΩ0.1 M

Display range ‒ 250 MΩ500 MΩ1000 MΩ1000 M

Range conguration

Maximum

displayed value

Resolution ‒ 1 M

Display range ‒ ‒ ‒ 2000 MΩ4000 M

Maximum

displayed value

Resolution ‒ ‒ ‒ 10 M

1.000 M

10.00 M

100.0 M

1 M

Ω

1.000 MΩ1.000 MΩ1.000 MΩ1.000 M

Ω

10 M

Ω

10.00 MΩ10.00 MΩ10.00 MΩ10.00 M

Ω

100.0 MΩ100.0 MΩ100.0 MΩ100.0 M

Ω

‒ 250 M

‒ ‒ ‒ 2000 M

1 M

Ω

10 M

Ω

0.1 MΩ0.1 MΩ0.1 M

Ω

500 MΩ1000 MΩ1000 M

Ω

1 M

Ω

1 M

Ω

10 M

Ω

1 M

Ω

Ω

Ω

Ω

Ω

Ω

1 M

10 M

1 M

4000 M

10 M

Ω

Ω

1

Ω

Ω

Ω

2

Ω
Ω

Ω

3

Ω

Ω

Ω

4

Ω

Ω

Ω

5

Ω

6

7

付録索引

63

Basic and Accuracy Specications

HIOKI IR4057B961-01

Insulation Resistance Measurement (continued)

1st effective

measuring range

±4% rdg

(0°C to 50°C)

±8% rdg

Fluctuations caused
by temperature

)*

effects (E

3

Effect of humidity

Effect of magnetic

eld

Fluctuations caused
by positioning effect

)

(E

1

Fluctuations caused
by supply voltage

)

effects (E

2

Effects of
capacitance
components
*: Applicable to the operating temperature range other than 18°C to 28°C.
Rated
measurement
voltage (DC)

Possible number of
measurements

Overload protection

(Greater than or

equal to −25°C and

less than 0°C, or

greater than 50°C

and less than or

equal to 65°C)

(Only for IR4056

and IR4057-50)

±4% rdg and within

allowance

±2.4% rdg ‒ ‒

±4% rdg and within

allowance

Within ±10% for capacitance of 5 μF or less (including

variation)

50 V 125 V 250 V 500 V 1000 V

660 V AC (10 s), 1200 V DC (10 s) (IR4053 and IR4055 only)

2nd effective

measuring range

±8% rdg

(0°C to 50°C)

±16% rdg

(Greater than or

equal to −25°C and

less than 0°C, or

greater than 50°C

and less than or

equal to 65°C)

(Only for IR4056

and IR4057-50)

±8% rdg and within

allowance

Not applicable

±8% rdg and within

allowance

1000 times or more

600 V AC (10 s)

Other measuring

range

±2% rdg ±6 dgt

(0°C to 50°C)

±4% rdg ±12 dgt

(Greater than or

equal to −25°C

and less than 0°C,

or greater than

50°C and less than

or equal to 65°C)

(Only for IR4056

and IR4057-50)

±2% rdg ±6 dgt

±2% rdg ±6

dgt and within

allowance

660 V AC

(10 s)

64

Basic and Accuracy Specications

HIOKI IR4057B961-01

Insulation Resistance Measurement (continued)

Display update
interval

Open-circuit
voltage

Lower limit
resistance
value to be
maintained rated
measurement
voltage

Rated current 1 mA to 1.2 mA

Short-circuit
current

Measurement terminal voltage characteristic

Response time

Judgment time

IR4053, IR4055, IR4056: Within 1.0 s (with resistance load)

(When switching from an open state to 10 times the default

IR4053, IR4055, IR4056: Within 1.0 s

(no update during response)

IR4057-50: Within 0.6 s (no update during response)

1 to 1.2 times of rated measurement voltage

0.05 MΩ0.125 MΩ0.25 MΩ0.5 M

1.2 mA or less

IR4057-50: Within 0.6 s (with resistance load)

IR4053, IR4055, IR4056: Within 0.8 s

IR4057-50: Within 0.3 s

judgment reference value)

1

2

1 M

Ω

Ω

3

4

5

6

7

付録索引

65

Basic and Accuracy Specications

HIOKI IR4057B961-01

Low Resistance Measurement (IR4056 and IR4057-50 only)

Open-circuit voltage 4.0 V to 6.9 V

Measuring current

Effect of temperature*

Effect of supply
voltage*
Response time Within 1 s (measurement terminal open → short)
Possible number of
measurements
Overload protection 600 V AC 10 s (by fuse protection)
Zero adjustment range 0
Display update interval Within 1 s

Display range

(Auto range)

10

Ω

100

1000

Ω

Ω

Range conguration

*: Display value is applicable after zero adjustment

(When the temperature changes more than 1°C, zero adjustment is necessary.)

(display value before zero adjustment at 6

(applied in the operating temperature range excluding

Maximum

displayed value

10.00

100.0

1000

Ω

200 mA or more

±3% rdg ±2 dgt

18°C to 28°C)

±3% rdg ±2 dgt and within allowance

200 times or more

to 3

Ω

Ω

Resolution Accuracy*

Ω

Ω

±3 dgt (0 Ω to 0.19 Ω)
±3% rdg ±2 dgt

to 10.00 Ω)

(0.20

Ω

±3% rdg ±2 dgt

0.01

Ω

Ω

0.1

1

Ω

or less)

Ω

66

Basic and Accuracy Specications

HIOKI IR4057B961-01

Voltage Measurement

AC/DC automatic
detection range

Effect of temperature

Overload protection

Display update interval

Response time

Input resistance 100 kΩ or more (50 Hz/60 Hz)

Frequency range 50 Hz/60 Hz

Display range

(Auto range)

420 V

(minimum displayed

value: 30.0 V)

AC Voltage Measurement

600 V 750 V 1 V

AC detected at 30 V or greater (50 Hz/60 Hz).

(pulsating currents with an overlapping AC component of

30 V or more are detected as AC)

Measurement accuracy per 1°C × 0.1

(applied in the operating temperature range excluding

1200 V DC (10 s) (IR4053 and IR4055 only)

(when input voltage is changed from 0 V to 600 V)

Range conguration

Maximum

displayed value

420.0 V 0.1 V

18°C to 28

750 V AC (10 s), 750 V DC (10 s)

Within 1 s

Within 1.2 s

Resolution Accuracy

°C)

±2.3% rdg ±8 dgt

(ranges in excess of

600 V are outside the

accuracy guarantee)

1

2

3

4

5

Input resistance 100 kΩ or more

Display range

(Auto range)

4.2 V 4.200 V 0.001 V
42 V 42.00 V 0.01 V

420 V 420.0 V 0.1 V
IR4053, IR4055:
1000 V

DC Voltage Measurement

IR4056, IR4057-50:
600 V

* Over 1000 V for IR4053 and IR4055 only

Range conguration

Maximum

displayed value

IR4053, IR4055:
1100 V
IR4056, IR4057-50:
750 V

Resolution Accuracy

±1.3% rdg ±4 dgt

(ranges in excess of

are outside the

600 V

*

1 V

accuracy guarantee)

6

7

付録索引

67

Basic and Accuracy Specications

HIOKI IR4057B961-01

Measurement voltage (DC)
Maximum displayed value
1st effective measuring range [MΩ]
Accuracy (Tolerance)
2nd effective easuring range [M
Accuracy (Ttolerance)
Other measuring range [MΩ]
Accuracy (Tolerance)
Effect of temperature (E

Effect of humidity

Effect of magnetic eld

Impact of positioning (E
Effect of supply voltage (E2)
Effect of superimposing DC voltage
Possible number of measurements
Overload protection
Display update interval

(no update during response)
Open voltage*
Lower limit resistance value to
maintain rated measurement
voltage
Rated current
Short-circuit current
Response time

Range conguration

Ω

) Accuracy × 1.0 (applicable to the operating

3

)

1

]

500 V PVΩ 1000 V

PV

Ω

2000 M

Ω

0.200 to 500 0.200 to 1000

501 to 2000 1010 to 4000

temperature range other than 18°C to 28°C)

Accuracy × 1.0 and within allowance

Accuracy × 1.0 and within allowance

660 V AC (10 s), 1200 V DC (10 s)

1 to 1.2 times of rated measurement voltage

20 MΩ ±5% 20 MΩ ±5%

0.025 mA ±20% 0.05 mA ±20%

Within 4.0 s (Measurement start → Display)

±4% rdg

±8% rdg

0 to 0.199

±2% rdg ±6 dgt

Accuracy × 0.5

Not applicable

Within ±10%

1000 times or more

Within 1.0 s

1.2 mA or less

4000 M

See explanation for 500 V and 1000 V of

the insulation resistance measurement

* For the PVΩ measurement function, the output voltage is divided by the

resistor and the resistor connected between measurement terminals

1 M

PVΩ Measurement (IR4053 and IR4055 only)

Ω

because a 1 M
Example: If a DMM with input impedance 10 M

current limiting resistor is connected to the EARTH terminal.

Ω

voltage, the voltage is divided by 1 M

is used to measure an open

Ω

and 10 MΩ.

Ω

Ω

68

Functionality specications

HIOKI IR4057B961-01

4.3 Functionality specications

Live circuit

indicator

Automatic electric

discharge

Auto power save (APS) The power will go off automatically approx.

Display Semi-transmissive FSTN liquid crystal, positive

Backlight • Color: white, red

Firmware update
function

Turns on when voltage is detected between the

LINE terminal and the EARTH terminal

Automatically discharges the electric charge
still present in the capacitance of the
measuring object after the insulation resistance
measurement.

Bar graph display of residual voltage

• Discharge resistance:

• Maximum capacitive load: 5 μF

•

Discharge time: Max. 30 s (when connected to

5 μF)

10 minutes after the last operation or last live
circuit indicator display.
Can be canceled using the power supply
activation options.

• Light automatic OFF function: Available (3 min.
after last operation)

• Turns red when the comparator judgment result
is FAIL.

• Operation at erroneous input: Alternates white
and red.

The instrument’s rmware can be updated using

GENNECT Cross.
Required: GENNECT Cross (Ver. 1.8 or later)

or less (IR4053 and IR4055)

1.2 M

Ω

or less (IR4056 and IR4057-50)

800 k

Ω

Instrument rmware (Ver. 2.00 or later)

1

2

3

4

5

6

7

付録索引

69

Functionality specications

HIOKI IR4057B961-01

Power-on Options

Canceling the
power-saving
function
(p. 30)

Displaying the
serial number

Checking the
HID setting
(p. 56)

Displaying
the software
version

Turn on the instrument while holding down the LIGHT
key.

Turn on the instrument while holding down the RELEASE
key.
The serial number will be displayed three digits at a time.
In the following example, the month and year of
manufacture are May 2021.
Example: [210] → [512] → [345]
After checking the number, set the rotary switch to OFF.

1. Turn on the instrument while holding down the

RELEASE key.

The serial number screen will be displayed.

2. Press RELEASE key for 3 s or more.
The HID setting saved by the Z3210 will be displayed.

1. Turn on the instrument while holding down the 0

ADJ key and the COMP key.

2. Press the RELEASE key while the [vEr] display is

active.

The display will alternate between the version number

vx.xx

and model

[

]

After checking the number, set the rotary switch to OFF.

405x

[

.

]

Ω

70

Maintenance and Service

HIOKI IR4057B961-01

5

WARNING

Touching any of the high-voltage points inside
the instrument is very dangerous. Customers are
not allowed to modify, disassemble, or repair the

instrument. Doing so may cause re, electric shock,

or injury.

Calibrations

The calibration period varies with the conditions and environment
of use. It is recommended to determine a calibration period based
on those factors and to have the instrument regularly calibrated by
Hioki. Please contact your authorized Hioki distributor or reseller to
have your instrument periodically calibrated.

Precautions when transporting the instrument

When transporting the instrument, be sure to observe the following
precautions:

• To avoid damage to the instrument, remove the batteries from
the instrument. Moreover, be sure to pack in a double carton.
Damage that occurs during transportation is not covered by the
warranty.

• When sending the instrument for repair, be sure to include details
of the problem.

Disposal

Handle and dispose of the instrument in accordance with local
regulations.

Cleaning

• To clean the instrument, wipe it gently with a soft cloth moistened
with water or mild detergent.

• Wipe the display gently with a soft, dry cloth.

• Wipe the dust from metal parts of alligator clips with a soft cloth to
avoid any impact on the measurements.

1

2

3

4

5

6

7

付録索引

71

Troubleshooting

HIOKI IR4057B961-01

5.1 Troubleshooting

Before Returning for Repair

If damage is suspected, check the following before contacting your
authorized Hioki distributor or reseller.

Symptom Check Items Remedy and Reference

The power is not
turning on.

The batteries run
out immediately.

The MEASURE
key is not working
for the lead with a
switch.
During insulation
resistance, low
resistance, or PV
measurement, the
live circuit indicator
and the display
blinks in red, and
the buzzer sounds.

Does the battery have

sufcient charge?

Have the batteries been

installed improperly?

Are you using alkaline

batteries?

Is the plug of the lead with

a switch fully inserted?

Does the voltage applied
between the measurement
terminals exceed the

Ω

following values?

Insulation resistance, PV

approx. 20 V

Low resistance: approx. 5 V

Replace with the new

batteries. (p. 22)

Install the batteries in the

proper orientation.(p. 22)

Replace the batteries with

alkaline batteries.(p. 22)

Fully insert the plug to the
limit without any gaps.

(p. 25)

Make sure that the
measuring object is
disconnected from a live
circuit. If voltage exists in

:

the measuring object, the

Ω

live circuit indicator blinks.

72

Troubleshooting

HIOKI IR4057B961-01

Symptom Check Items Remedy and Reference

Unable to perform
measurement.

Unable to perform
measurement in

500 V, 1000 V or

range.

PV

Ω

In the 500 V range,
1000 V range or

range, turning

PV

Ω

on the MEASURE
key enables the
lock function that
has been released.

Are you setting the rotary
switch while the MEASURE

key turned on?

Is the voltage between the
measuring terminals over
any of the following values
before turning on the

MEASURE key?

50 V to 250 V range:
Approx. 90 V
500 V and PV
ranges: Approx. 500 V
1000 V and PV
ranges: Approx. 1000 V

Is the instrument locked so
as to prevent inadvertent

voltage application?

Is the battery new?

Does the battery have

sufcient charge?
Is alkaline battery used?
Is the temperature low (0°C
or less)?

Has 1 minute lapsed after

the last operation?

500 V

Ω

Ω

1000 V

Turn off the MEASURE key
and then press it again.

Separate the measuring
object from all sources of
power before performing
measurement.

Release the lock function.

(p. 35)

Replace the batteries with
new alkaline batteries. *

(p. 22)

Remove the batteries and
warm them up, or replace
them with new alkaline

batteries. (p. 22)

Release the lock function

again. (p. 35)

1

2

3

4

1

5

6

7

The measured
value is shown
as the maximum
display value.

Is there a broken

connection in a test lead?

Are the test leads securely

connected?

Check the continuity of the

test lead with a tester.

Check the connection

between the test leads and
the instrument, and check
the connection of the tips of
the test leads.

73

付録索引

Troubleshooting

HIOKI IR4057B961-01

Symptom Check Items Remedy and Reference

Measured values
vary and fail to
stabilize.

Measured
values acquired
through insulation
resistance
measurement or

measurement

PV

Ω

uctuate over time.

(If using the

IR4057-50, use
the 1-minute value
display function.)

Is a charging circuit located
near the measurement

object?

When the measuring object
connected is a capacitor:
Does the measuring object
have a large capacitance

component (capacitor)?

When the measuring
object connected is not a
capacitor:
This phenomenon

reects the inuence of

the measuring object
capacitance component.
This is not a malfunction or
error.

Disconnect the circuit
breaker for any nearby
charging circuits. If this is
not possible, use the lowest
measured value as the
measurement result.

If it is possible to remove
the capacitor, do so.
If not, use the lowest
measured value as the
measurement result.

Select measured values
acquired one minute
after the start of the
measurement.
If a large capacitance
component included in the
measuring object causes

the uctuation of measured

values, select measured
values after they have
stabilized.

74

Troubleshooting

HIOKI IR4057B961-01

Symptom Check Items Remedy and Reference

A different
measured value
results each
time the same
measuring object
is measured.

The output
voltage polarity is
reversed.

Is there any impact due
to the material of the

measuring object?

Is there any impact due to
the temperature/humidity
characteristics of the

measuring object?

The reversal is due to
the characteristics of the
insulation ohmmeter.
This does not represent a
malfunction.

Allow an adequate amount
of time (about 1 hour to

1 day) to pass after the
rst measurement before

repeating measurement.
The effects of polarization*
increase as the insulation
resistance increases.

Measure the object under
the same temperature
and humidity conditions.
In general, an insulator’s
insulation resistance
value will decrease as
temperature and humidity
increase.
Reference: the insulation
resistance value of some
insulated cables decreases
to 1/4 or less when the

temperature increases 10°C.

–

1

2

2

3

4

5

6

7

付録索引

75

Troubleshooting

HIOKI IR4057B961-01

Symptom Check Items Remedy and Reference

When the
instrument is
calibrated, the
accuracy of
the insulation
resistance range
falls outside
the device

specications.

*1 Batteries with high internal resistance may not be able to deliver enough

energy to power the instrument, even if you’re using new alkaline batteries

or batteries with sufcient charge. If the instrument does not operate even

though its batteries have just been replaced, try batteries from a different
manufacturer.

*2 Polarity: A phenomenon whereby a substance’s positive and negative

electric charges move in opposite directions when an electric eld is

applied to it, causing the center position of the positive and negative
charges to shift.

Has the supplied or

optional test lead used?

Has the insulation of the

test lead deteriorated?

Use the test leads that
came with the instrument
or its optional test leads
to perform the calibration
procedure. With standard
wiring, characteristics are
affected when the resistance

in the 1000 V range reaches
or exceeds 100 M

Replace the deteriorated
test lead with a new one.

.

Ω

76

Troubleshooting

HIOKI IR4057B961-01

Errors and status codes

When an error is displayed on the LCD screen, repair is necessary.

Please contact your authorized Hioki distributor or reseller.

IR4053, IR4055, IR4056

1

Code Description Remedy and Reference

Err1

Err2

Err3

Err4

Err6

Err8

FUSE (blinks)

bAtt

The instrument was
unable to perform
zero adjustment.
(Low resistance

measurement)

The specied fuse has

not been installed.

Settings data
damaged.

Adjustment data
damaged.

Abnormality in
measurement circuit.

Abnormality in voltage
generation circuit.

Wireless
communications error.

The protective fuse has
tripped.

Low battery voltage. Replace the batteries. (p. 22)

• Verify that there is no broken
connection in the test leads.

• Zero adjustment can be
performed for readings of up

. Ensure that the wiring

to 3

Ω

resistance is 3 Ω or less. (p. 42)

Use only the specied type of
fuse. (p. 22)

Repair is required.

Replace the batteries.
If there is no apparent
improvement, the instrument
needs repair.

Repair is required.

Replace the indicated fuse.

(p. 22)

2

3

4

5

6

7

付録索引

77

Troubleshooting

HIOKI IR4057B961-01

IR4057-50

Code Description Remedy and Reference

• Verify that there is no broken
connection in the test leads.

• Zero adjustment can be
performed for readings of

up to 3

. Ensure that the

Ω

wiring resistance is 3
less. (p. 42)

Repair is required.

Replace the batteries.
If there is no apparent
improvement, the instrument
needs repair

Take the following actions

(p. 27):

• Reinstall the Z3210.

• Install a different Z3210.

If the error persists, you are
experiencing a instrument

failure. Contact your authorized

Hioki distributor or reseller to
organize repair.

Use GENNECT Cross to
update the rmware again.
(p. 69)

Replace the indicated fuse.

(p. 22)

Replace the batteries. (p. 22)

Err 0ΩADJ

Err1

Err2

Err4

Err5 01

Err5 02

Err8

Err9

FUSE (blinks)

APS → P.oFF

bAtt → P.oFF

Zero adjustment is outside
the allowable range.
(Low resistance

measurement)

Program data corrupt.

Adjustment data damaged.

The EEPROM used to
store settings data has
failed (including failure
to communicate with the

EEPROM).

Abnormality in
measurement circuit.

Abnormality in voltage
generation circuit.

Z3210 communications

error

(connection failure; Z3210
or hardware failure)

Firmware update error

The protective fuse has

tripped. (The fuse is user­replaceable.)

Powered off by APS. –

Instrument powered off
due to supply voltage drop

or

Ω

78

Appendix

HIOKI IR4057B961-01

Appx. 1 Measurement Principles

1. Insulation resistance measurement

The measuring object’s insulation resistance Rx is calculated by applying a

voltage V to the object, measuring the leak current I that ows to the object as

a result, and dividing the voltage V by the leak current I.

2. Low resistance measurement (IR4056, IR4057-50)

The measuring object’s resistance Rx is calculated by applying a current I

to the measuring object, measuring the voltage V that occurs between the

measurement terminals as a result, and dividing the voltage V by the current I.

measurement (IR4053, IR4055)

3. PV

Ω

The resistance Rx is calculated using the equation (Applied voltage V)/
(Leakage current I) by applying a voltage V to the measuring object, and then
measuring the leakage current I owing through the measuring object and
applied voltage V. (Voltage and current generated from the measuring object
are subtracted.)

1

2

3

4

5

6

7

Appx.

索引

Appx.1

Operation Uncertainty

HIOKI IR4057B961-01

Appx. 2 Operation Uncertainty

The operation uncertainty and the variations of measurement value for the
respective inuence quantity approved by EN/IEC61557 are as follows:

Intrinsic uncertainty/

inuence quantity

Intrinsic

A

uncertainty

E2Supply voltage 4.5 V to 6.8 V ±4% rdg ±3% rdg ±2 dgt

E

Temperature 0°C to 35°C ±4% rdg ±3% rdg ±2 dgt

3

Operation

B

uncertainty

Guaranteed range of operation

Inuencing factor non-applicable for E1 and E4 to E

uncertainty

Operation

range

Reference

condition

resistance

1st effective

measurement

Variation

Insulation

±5% rdg ±3% rdg ±2 dgt

±12% rdg ±30% rdg

range

10

Low resistance

0.2

to 2

Ω

Ω

Appx.2

Insulation Resistance Measurements for Solar Cell Array

HIOKI IR4057B961-01

Appx. 3 Insulation Resistance

Measurements for Solar Cell
Array

There are two insulation resistance measurements for solar cell arrays.
Characteristics of them are as follows:

Measurement with P-N opened

PVΩ measurement of this manual is explained with this measurement.

As solar cell voltage inuences the test voltage, the measurement may not
be accurate. Incorrect procedure may damage the solar panel. If earth fault is
occurred due to earth leakage as shown in the following gure, current being
generated inuences the insulation resistance meter resulting in inaccurate
measurement with a normal insulation resistance meter. PV
mode of the IR4053 and IR4055 allows accurate measurements without the
effect from power generation.

P

measurement

Ω

Connection box

1

2

3

4

N

PV

Earth

PV

leakage

P

N

Earth

Connection box

Earth

Insulation resistance meter

Measurement with P-N shorted

This measurement allows accurate measurements but is also a highly

dangerous method as arc discharge may be generated due to the short

circuit. There is also a re risk depending on the deterioration level of the

solar panel.

PV current

current reading

5

6

7

Appx.

索引

Appx.3

Insulation Resistance Measurements for Solar Cell Array

HIOKI IR4057B961-01

Appx.4

HIOKI IR4057B961-01

HIOKI IR4057B961-01

HIOKI IR4057B961-01

Ueda, Nagano 386-1192 Japan 65760

HIOKI IR4057B961-01

Rudolf皿 Diese卜Strasse 5

Eschborn, Germany

[e-mail]