Hioki CM7290, CM7291 Instruction Manual

CM7290

HIOKI CM7290A961-03

CM7291

DISPLAY UNIT

Instruction Manual

Jan. 2022 Revised edition 3
CM7290A961-03 22-01H

EN

*600457193*

HIOKI CM7290A961-03

Contents

HIOKI CM7290A961-03

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

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

Measurement Flowchart ...................................................................3

When performing standalone measurement .............................. 3

When measuring while connected to another device ................ 4

Safety Information ............................................................................. 6

Operating Precautions ...................................................................... 8

1 Overview 11

1.1 Overview and Features ................................................. 11

1.2 Parts and Functions .....................................................12

Display .....................................................................................13

Warning and battery power displays ........................................ 14

1.3 Tables of Key Operations ............................................. 15

Measuring ................................................................................16

Display/output/communication ................................................. 17

System operation ..................................................................... 18

Maintenance operation.............................................................19

Handy functions .......................................................................20

Key congurations....................................................................22

2 Pre-measurement Preparation 25

2.1 Installing the Z5004 Magnetic Strap ............................ 25

2.2 Connecting the Sensor ................................................. 26

2.3 Supplying Power ........................................................... 27

2.4 Turning the Power On/Off ............................................30

2.5 Connecting to an External Device ............................... 31

CM7290A961-03

Installing/replacing the batteries...............................................27

Connecting the AC adapter (optional) ......................................28

Connecting to an external DC power supply ............................29

When using battery power .......................................................30

When using the AC adapter or an external DC power supply: .30

Appx.

i

Contents

HIOKI CM7290A961-03

3 Measurement and Output 33

3.1 Inspection Prior to Use ................................................. 33

3.2 Taking Measurements ..................................................34

Types of output in the different measurement modes .............. 35

Setting measurement range ..................................................... 36

3.3 Changing the Display/output update time (rate)

(to Faster or Slower) ..................................................... 37

3.4 Examples of Measurement Waveforms ......................38

3.5 Bluetooth

Installing the application software GENNECT Cross ...............39

Pairing the app with the CM7291 ............................................. 40

Making measurements with the Bluetooth® function ................ 40

®

Communications (only for CM7291) ......... 39

4 Specications 41

4.1 GeneralSpecications .................................................41

4.2 InputandOutputSpecications,and

MeasurementSpecications .......................................43

4.3 FunctionalSpecications ............................................49

4.4 ConnectionTerminalSpecications ...........................53

4.5 ExternalInterfaceSpecications(onlyforCM7291) .53

5 Maintenance and Service 55

5.1 Troubleshooting ............................................................56

5.2 Error Displays ...............................................................60

Appendix 61

Appx.1 RangeStructure,Outputrate,andPower

Appx. 2 Calculating Accuracy when Used with a Sensor 62
Appx. 3 Combinational Accuracies

Appx. 4 Measurement Response Waveforms ...................74

ii

Consumption Category with a Sensor

Connected .............................................................. 61

(Representative values) ........................................66

Introduction

HIOKI CM7290A961-03

Thank you for purchasing the Hioki CM7290/CM7291 Display Unit. To obtain

maximum performance from the unit, please read this manual rst, and keep it handy

for future reference.

Latest instruction manual

The contents of this manual are subject to change, for example as a result

of product improvements or changes to specications.

The latest edition can be downloaded from Hioki’s website.

https://www.hioki.com/global/support/download

Verifying Package Contents

When you receive the unit, inspect it carefully to ensure that no damage occurred
during shipping. Pay particular attention to 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.

CM7290 or CM7291 Instruction manual

For the instruction manual in other languages,
see the Hioki website.

LR6 alkaline battery (AA) × 2

Protector (pre-installed)

Precautions Concerning Use of Equipment
that Emits Radio Waves

(only for CM7291)

1

Verifying Package Contents

HIOKI CM7290A961-03

Options

• The options listed below are available for the unit. 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.

• Use an optional sensor equipped with a Hioki PL14 output connector.

9445-02 AC Adapter

L9094 Output Cord (for banana terminal, 1.5 m)

L9095 Output Cord (for BNC terminal, 1.5 m)

L9096 Output Cord (for lead terminal, 1.5 m)

C0220 Carrying Case (for sensor and display unit)

C0221 Carrying Case (for 30 m extension cable, sensor and display unit)

L0220-01 Extension Cable (2 m)

L0220-02 Extension Cable (5 m)

L0220-03 Extension Cable (10 m)

L0220-04 Extension Cable (20 m)

L0220-05 Extension Cable (30 m)

L0220-06 Extension Cable (50 m)

L0220-07 Extension Cable (100 m)

Z5004 Magnetic Strap

2

Measurement Flowchart

「 シ ー ル ド 線 は 挟 ま な い 」の 説 明 を

記載する/しないは製品ごと技術に確認する
　↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓

NO

「 シ ー ル ド 線 は 挟 ま な い 」の 説 明 を

記載する/しないは製品ごと技術に確認する
　↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓

NO

NONO

HIOKI CM7290A961-03

Measurement Flowchart

When performing standalone measurement

Installation and connection

Inspect prior to use (p. 33).

Connect the sensor to the unit (p. 26).

Connect the unit to the power supply (p. 27).

You will need:

A sensor equipped with a Hioki PL14
connector (optional)

You will need:

LR6 alkaline battery (AA) ×2
or an AC adapter

See “Options” (p. 2).

Turn the power on (p. 30).

If being driven by an AC adapter, the unit is automatically powered on.

Measuring

Execute zero adjustment (p. 16).

Zero adjustment is unavailable for
sensors dedicated for AC measurement.

Connect the sensor to the conductor to

be measured (p. 34).

Select the measurement mode (p. 16).

Check the measured values.

OK

Zero

adjustment

Measure-

ment modes

NO

Ending

Disconnect the sensor from the
conductor measured, and turn off the
unit’s power supply.

3

Measurement Flowchart

HIOKI CM7290A961-03

When measuring while connected to another device

Installation and connection

Inspect prior to use (p. 33).

Connect the sensor to the unit (p. 26).

Connect the unit to the power supply

(p. 27).

Turn the power on (p. 30).

If being driven by an AC adapter, the unit is automatically powered on.

Connect the output of the unit to an

external device (p. 31).

You will need:

A sensor equipped with a Hioki PL14
connector (optional)

You will need:

• Output cord

• Extension cable (if the sensor’s output
cable is not long enough)

See “Options” (p. 2).

Measuring

Execute zero adjustment (p. 16).

Zero adjustment is unavailable for
sensors dedicated for AC measurement.

Connect the unit to the conductor to be

measured (p. 34).

Set (p. 15)

Observe and record waveforms with the
external device.

Required settings:

1. Measurement modes (p. 16)

1. Output mode (p. 17)

2. Range ((p. 16), p. 35p, p. 61)

Ending

Turn the power off to complete measurement.

4

Measurement Flowchart

HIOKI CM7290A961-03

Example of connection to devices installed in a measuring system

With the settings below, the unit will start up in the previously selected output mode
and begin generating output whenever the power is supplied through the external
power supply jack. This is the recommended way if the unit is connected to devices
installed in a measuring system.

See “2.5 Connecting to an External Device” (p. 31).

Conductor to

be measured

Sensor

Display unit

Connectable connector

JEITA RC5320A
Classication 3
(EIAJ RC5320A TYPE 3)

(Grip portion external
diameter not more than

10 mm)

φ

Power

supply

Measuring system

Measurement

- 2

1

2

-  4

1

circuitry

-

1

1

- 3

1

Output

Connections

1

Connect the devices as follows:

1. Sensor – to the conductor to be
measured

2. Display unit − to the sensor

3. Display unit – to the output destination

4. Display unit – to the (standalone DC
isolated) power supply

Setting

2

Congure the settings in the following

order:

1. Set the appropriate measurement
mode, output mode, or range

2. Set "Enable" or "Disable"

for zero adjustment at power-up

3. Save settings
(save the measurement mode settings
at power-up)

4. Set the key lock to "Enable"
(to avoid operational mistakes)

Measures against power outage

• If batteries have been installed in the unit, it will switch to battery power if power
from the AC adapter or external power supply (connected via the external power
supply jack) is interrupted and then continue to generate output as long as the

battery lasts. Once the external power supply is restored, the unit will switch back

to that power source.

• The displayed value or output may be affected by switching noise when the unit
switches from battery to AC adapter or vice-versa.

5

Safety Information

HIOKI CM7290A961-03

Safety Information

This unit is designed to conform to IEC 61010 Safety Standards, and has been
thoroughly tested for safety prior to shipment. However, using the unit in a way not
described in this manual may negate the provided safety features.

Before using the unit, be certain to carefully read the following safety notes.

WARNING

• Electricity poses risks of electric shock and arc discharge due to
short circuits. Individuals using an electrical measuring instrument

for the rst time should be supervised by a technician who has

experience in electrical measurement.

• Protective gear
This unit measures live lines. To prevent electric shock accidents,
wear protective insulation in accordance with laws and regulations.

CAUTION

Mishandling during use could cause damage to the unit. Be certain that you

understand the instructions and precautions in the manual before use.

Notation

In this manual, the risk seriousness and the hazard levels are classied as follows.

DANGER

WARNING

CAUTION

IMPORTANT

*

Bold character

6

Indicates an imminent hazard that could lead to serious injury or death.

Indicates a hazard that could lead to serious injury or death.

Indicates a hazard that could lead to minor injury or that could be expected

to result in equipment or other damage.

Indicates information related to the operation of the unit or maintenance
tasks with which the operators must be fully familiar.

Indicates a strong magnetic-eld hazard.

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

Indicates the prohibited action.

Indicates the action which must be performed.

Additional information is presented below.

Control operation keys are enclosed in blackets ([ ]).

Symbols displayed on the unit

1 2 3 4 5 6 7 8 9 0

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

HIOKI CM7290A961-03

Indicates cautions and hazards. When the symbol is printed on the unit, refer to a

corresponding topic in the instruction manual.

Indicates DC (Direct Current).

Indicates AC (Alternating Current).

Symbols for various standards

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

This symbol indicates that the product conforms to regulations set out by the EU Directive.

Indicates that the product incorporates Bluetooth® wireless technology.

Characters in screen displays

The screen of this unit displays characters in the following manner.

Safety Information

7

Operating Precautions

HIOKI CM7290A961-03

Accuracy

We dene measurement tolerances in terms of f.s. (full scale), rdg. (reading) and dgt.

(digit) values, with the following meanings:

(Maximum display value)

f.s.

rdg.

dgt.

Indicates the display unit’s maximum display value for the range that is currently
in use.

(Reading or displayed value)
The value currently being measured and indicated on the measuring instrument.

dgt. (resolution)
The smallest displayable unit on a digital measuring instrument, i.e., the input

value that causes the digital display to show a “1” as the least-signicant digit.

Operating Precautions

Follow these precautions to ensure safe operation and to obtain the full benets of

the various functions.

DANGER

• Do not use the unit beyond its rated and specication ranges. Doing
so could make the unit break or heat up, possibly resulting in bodily
injury.

• The sensor's maximum measurable current generally varies with
the frequency, and this restricts the current that can be measured
continuously with derating. Do not use the unit to measure currents
that exceed the derating. Doing so could cause heat emission from

the sensor, which could result in a malfunction, cause re or burn

injury.

• Persons wearing electronic medical devices such as a pacemaker
should not use the Z5004 Magnetic Strap. The Z5004 Magnetic
Strap could interfere with electrical medical devices, and should be
kept away. The medical device's operation could be compromised,
posing risk to the wearer's life.

Do not use an uninterruptible power supply (UPS) or a DC-AC inverter that
produces rectangular waves or pseudo-sine-wave output to power the unit.
Doing so may damage the unit.

8

CAUTION

Usage environment

HIOKI CM7290A961-03

WARNING

Avoid the following locations that could cause an accident or damage
to the unit.

• 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 high-frequency induction

heating systems and IH cooking equipment)

• Susceptible to mechanical vibrations

• Exposed to water, oil, chemicals, or solvents

• Exposed to high humidity or condensation

• Exposed to high quantities of dust particles

Cautions for connecting to terminals

CAUTION

•

To prevent damage to the BNC connector (optional
L9095), be sure to release its locking mechanism before

pulling it out, and grip it by its head (not by the cable).

Operating Precautions

• When disconnecting a connector from the unit, be sure to grip the part
of the connector with the arrows and pull it straight out. Gripping the
connector elsewhere or pulling with excessive force may damage the
connector.

AC adapter

Use only the specied AC adapter. AC adapter input voltage range is

100 to 240 V AC at 50/60 Hz. To avoid electrical hazards and damage
to the unit, do not apply voltage outside of this range.

WARNING

9

Operating Precautions

HIOKI CM7290A961-03

Handling of the cables

Damage to the cables or the unit may result in electric shock. Before
using the unit, perform the following inspection.

• Before using the unit, make sure that the insulation on the cables are

undamaged and that no bare conductors are improperly exposed. If

there is any damage to the insulation, have the cable(s) repaired.

• Verify that the unit operates normally to ensure that no damage

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

contact your authorized Hioki distributor or reseller.

Batteries

Heed the following instructions to avoid battery performance drop or leakage.

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

• Pay attention to the polarity markings "+–", so that you do not insert the

batteries the wrong way around.

• Do not use a battery beyond its recommended use period.

• Do not leave a depleted battery inside the unit.

• Be sure to replace it with a battery of the specied type.

• Remove the batteries and store them if the unit will not be in use for

a long time.

WARNING

CAUTION

IMPORTANT

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

• The
soon as possible.

• Do not remove the rubber seal from the battery cover.

• Replace the rubber seal on the battery cover as soon as it deteriorates. When

replacing a part, please contact your authorized Hioki distributor or reseller.

10

indicator lights up when the batteries have run low. Replace them as

1

HIOKI CM7290A961-03

Overview

1.1 Overview and Features

The CM7290 Display Unit is to be used with a current sensor equipped with a Hioki
PL14 output connector. It will automatically recognize the current sensor when
it is connected, and the range and output rate will be automatically set. Set the
measurement mode to AC or DC so that the unit can display or output values.

The unit supports simultaneous dual displays – for example, of the measured value
and output rate during output, or of the current measured value and maximum value.

You can clamp the sensor in high or conned locations, and view the display close

at hand. And even when you're in low-light conditions, the backlight feature will allow
easier reading of displayed values.

With the optional output cord, waveforms, rms vales and so forth can be output in
analog form to a recorder, logger or power meter for waveform observation, long-term
recording, power analysis or similar application.

Supports 2 power sources – AC adapter and batteries – for prolonged measurement.
The unit can be turned on by powering an AC adapter, so installation into other
devices is made possible.

The CM7291 also provide Bluetooth communications functionality, allowing
measurement data to be monitored and logged from a smartphone or tablet.

CAUTION

Because the CM7291 emits radio waves, an approval or a license issued by a
country or region where it is used is required to use it. Use in a country or region

where it has not been approved may be subject to nes or other penalties as a

violation of applicable laws or regulations.
For more information about approved countries/regions for use, see the attached
“Precautions Concerning Use of Equipment That Emits Radio Waves” or visit
Hioki’s website.

Trademark

• 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.

• Android and Google Play are trademarks of Google, Inc.

• IOS is a registered trademark of Cisco Systems, Inc. and/or its afliates in the
United States and certain other countries.

• iPhone, iPad, iPad mini

• The App Store is a service mark of Apple Inc.

TM

, iPad ProTM, and iPod touch are trademarks of Apple Inc.

11

Parts and Functions

HIOKI CM7290A961-03

1.2 Parts and Functions

CM7291 (Display unit with protector)

Front

Sensor input
connector

(p. 43)

Rear

Bottom

Protector*

Display section

(p. 13)

Control keys

(p. 15)

“AC adapter” (p. 9)

AC adapter jack (external power supply jack) (p. 28)

Output jack (p. 31)

1

Serial No. label

Battery cover

(p. 27)

*2

*1:

If the protector or dust cap gets dirty or damaged, replace it as necessary.
Contact your authorized Hioki distributor or reseller when ordering.

*2:

The serial number consists of 9 digits. The rst two (from the left) indicate the year of

manufacture, and the next two indicate the month of manufacture. Do not remove the
label, as it is needed for the product warranty.

12

Dust cap

*1

(p. 31)

Display

HIOKI CM7290A961-03

Parts and Functions

1717181819192020

11
22
33

44
55
66

77

88
99

1010

Output ×10 function enabled (p. 17)

11

Output mode enabled (p. 17)

22

Response speed (p. 17)

33

Hold function enabled (p. 16)

44

Filter function is enabled (p. 22)

55

Measurement modes (p. 16)

66

Over-range (p. 14)

77

Over-output (p. 14)

88

Auto ranging /

99

Manual ranging

Zero adjustment at power-up

1010

enabled

(p. 16)

(p. 20)

1616

1515

1414

1313

1212

1111

Save settings enabled (p. 20)

1111

Unit

1212

Measured value (main display)

1313

Items displayed when analysis

1414

display is enabled

(Sub display:)

1515

Instantaneous value when
analysis display is enabled

Output rate when output mode
is enabled

Bluetooth® Communications (p. 18)

1616

Key lock function enabled (p. 18)

1717

Auto power-save function

1818

enabled

Battery power warning display (p. 14)

1919

AC adapter connected (p. 28)

2020

(p. 16)

(p. 16)

(p. 17)

(p. 20)

13

Parts and Functions

HIOKI CM7290A961-03

Warning and battery power displays

Warning displays

Appears when the measured value exceeds the maximum input range.

Appears when the display value exceeds the output range while the
output mode is PEAK or FREQ.

Battery power warning display

Battery full.

As the battery is discharged, solid black bars disappear from left to right.

Battery low. Please replace them as soon as possible.

(ashing) Battery depleted. Replace with new batteries.

Power shut-off

• When battery-powered, power is turned off automatically if the unit is not operated

for approx. 10 minutes (p. 20).

• The power will also be turned off when the batteries have run low. Replace with

new batteries (p. 27).

14

Tables of Key Operations

HIOKI CM7290A961-03

1.3 Tables of Key Operations

This section describes how to access different functions by pressing keys differently.

Turn on power

while pressing key*

Execute a specic

command (see the

following pages)

Displays the model

number and software

version

Example:

Short press 1-second long press

Execute the operation

written on the key

Switches the range

Execute the operation

written above the key

Filter function

enabled/disabled

* : Method of turning on the power will differ depending on the power source.

See "2.5 Connecting to an External Device" (p. 31).

Power source Turning on the power Example

First turn off the power and then press

Batteries

AC adapter
or
external DC
power supply

the [ON/OFF] key while pressing the



key

With the connector of the AC adapter
or power cord disconnected from the



unit insert the connector while pressing
the key

For more information, see the appropriate table(s) on the following pages, as set out
below.

How to use the unit based on the
operation you wish to perform

Roles of individual keys

• "Measuring" (p. 16)

• "Display/output/communication"

(p. 17)



• "System operation" (p. 18)

• "Maintenance operation" (p. 19)

• "Handy functions" (p. 20)

• "Key congurations" (p. 22)



15

Tables of Key Operations

HIOKI CM7290A961-03

Measuring

Desired operation

(function)

Turn the power on
(with battery drive)

Turn the power off
(with battery drive)

Execute zero
adjustment

Switch the
measurement mode

Hold display
updating (HOLD)

Switch ranging
manually (Ranging)

How to set/

cancel it

Short press

1-second

long press

1-second

long press

Short press

Short press

Short press

Screen display

Enabled: Lit

Disabled: Unlit

Display lights up

Display

goes out

Example:

: DC measurement ("DC")

: AC measurement ("AC")

: AC + DC measurement ("AC+DC")

: Frequency measurement ("Hz")

RANGE: AUTO:
Auto ranging

RANGE: MANUAL:
Manual ranging

Description

• When the unit is driven
by power from an AC
adapter or external DC
power supply, this key is
disabled, and in order to
turn the power off you must
disconnect the connector
from the AC adapter's or
external DC power supply's

terminal (p. 30).

• When power from an AC
adapter or external power
supply is turned off with
batteries installed in the
unit, the batteries will begin
automatically to power the unit.

• Resets the display value to
zero, after memorizing it.

• Disabled if an AC current
sensor is connected.

• Halts updating of the display.

• Can be used for any
measurement.

• Factory settings: Auto
ranging (appropriate range
is switched to automatically)

• You can also change the
range manually.

• When output becomes valid
during auto-range operation,
auto-range operation will
be disabled, and the unit
will switch to manual range
operation using the present
range.

16

Tables of Key Operations

HIOKI CM7290A961-03

Desired operation

(function)

Analyze the
measured values
(Analysis display)

How to set/

cancel it

Start: Short press
Switch: Short
press
Cancel: 1-second
long press

Screen display

Enabled: Lit

Disabled: Unlit

"MAX":

Maximum value
"MIN":
Minimum value
"AVG":
Average value

PEAK MAX

Maximum peak
value

PEAK MIN

Minimum peak
value

Display/output/communication

Desired operation

(function)

Switch the
response speed

Switch the
measurement mode

How to set/

cancel it

Short press

Short press

Screen display

Enabled: Lit

Disabled: Unlit

FAST:
NORMAL
SLOW:

WAVE: Waveform
RMS: Root mean square
PEAK: Max. absolute value at update time

FREQ: Frequency

• Output varies with the output mode.

• Output rate is displayed in sub display.

• Output is ground output when the output mode
is disabled.

Description

• The unit will display values
for the interval starting
when the analysis display
was activated (in the main
display).

• The current instantaneous

:

:

Time See:

Fast

:

Slow

interval, with sampling of 2 kS/s

values are also displayed
(in the sub display).

• The peak values are
0-to-peak values. (Polarity
is indicated.)

Description

• "Display and output update

rate" (p. 49)

• "Appx. 4 Measurement
Response Waveforms"

(p. 74)

17

Tables of Key Operations

HIOKI CM7290A961-03

Desired operation

(function)

Make output 10

mode, then give

times higher than
normal
(output × 10)

Enable Bluetooth®
communications

(only for CM7291)

System operation

Desired operation

(function)

How to set/

cancel it

Select output

+

a 1-second

long press

a 1-second

long press

How to set/

cancel it

Screen display

Enabled: Lit

Disabled: Unlit

Screen display

Enabled: Lit

Disabled: Unlit

Description

This function is used when
the magnitude of the output
is so low that it may be
obscured by noise from
nearby equipment. The output
will be boosted by a factor of
10, but the output range will
be limited.

Output ranges:

WAVE: ±5 V±0.3 V
RMS: 0 V to 5 V±0.3 V
PEAK: 0 V to 2.3 V±0.1 V

See:
"Making measurements
with the Bluetooth® function"

(p. 40)

Description

Turn on the
backlight

Turn off the buzzer

Disable key
operation
(key lock)

18

Short press

Turn on

power while

pressing key

1-second

long press

Backlight

turns on

−

−

• Factory settings: buzzer
turned on

• Setting is memorized when
power is turned off.

All key operations except key
lock cancelation are disabled.
However, the ON/OFF button
can be used.

Maintenance operation

HIOKI CM7290A961-03

Tables of Key Operations

Desired operation

Display Serial No.

Display model
number and
software version

Check if all LCD
segments are
displayed

Revert to factory
settings

*1: The 9-digit serial number will be displayed as a series of three numbers.
*2: The model number is displayed in the sub display, and the software version is displayed in

the main display.

How to set/

cancel it

Turn on

power while

pressing key

Turn on

power while

pressing key

+

Turn on

power while

pressing key

Turn on

power while

pressing key

Screen display Description

Used for checking the Serial
No. when you are unable to

*1

*2

All segments of

display will

light up

−

check the No. on the back of
the unit because it has been
installed into another device.

The model number and
software version will
be displayed.

• Used for inspection prior

to use (p. 33).

See "4.3 Functional
Specications" (p. 49).

19

Tables of Key Operations

HIOKI CM7290A961-03

Handy functions

Desired operation

(function)

: Enabled (factory



settings)

Execute zero
adjustment
automatically when
power is turned on
(Zero adjustment at
power-up)

Save the settings
(Save settings)

How to set/

cancel it

Turn on

power while

pressing key

1-second

long press

Screen display

Enabled: Lit

Disabled: Unlit

Description

• This function can be used if
a no-input state will continue
for approximately 1 minute
when the unit is turned on.
Check the unit if there is
any input as the following
may occur:

• The screen display may
indicate FAIL.

• Zero-adjustment data may
be cleared.

• A large error component
may result.

• When this function is

disabled, press the [0ADJ]
key to execute zero
adjustment as necessary.

• Setting is memorized when
power is turned off.

• Use this to save the current
settings (except the auto
power-save function setting,
which will not be saved).

• You can then measure
using the saved settings
right away when you next
power up.
The unit will detect the
sensor type, including
whether it is an AC sensor
or an AC/DC sensor, its
rating, and its output rate.
Settings can be saved
for each sensor type. So,

for example, CT7636 and
CT7736 will be identied as

the same sensor.

• Settings saved may be
deleted as a result of
calibration or repair.
the setting status before
using the unit.

Check

20

Tables of Key Operations

HIOKI CM7290A961-03

Desired operation

(function)

: Enabled (factory



settings)

Have backlight
turned off
automatically



When the unit is
battery-powered,
disable the APS
(auto power-save).

Remove noise and
other unwanted
frequency
components
(Filter function

*1

)

How to set/

cancel it

Turn on

power while

pressing key

Turn on

power while

pressing key

1-second

long press

Screen display

Enabled: Lit

Disabled: Unlit

−

APS

Description

• Backlight will be turned off
automatically after being lit
for approx. 40 seconds.

• Setting is memorized when
power is turned off.

• Disable the APS function.

• The battery-powered unit
is automatically turned off
when the APS function is
enabled after approximately
10 minutes of inactivity.
(p. 51)
The APS segment on the
screen blinks, and the
buzzer sounds before the
unit is turned off.

• The APS function will be
automatically disabled if
the output, analysis display
or key lock function is
enabled.
is disabled, APS will be
automatically re-enabled.)

• APS is disabled when an
AC adapter is used.

This can only be set in the
AC, AC+DC, and Hz modes.

(When that function

*1: The display value and output value are values that have been passed through a low-pass

lter (LPF) with cut-off frequencies (fc) around 180 Hz. With the lter function enabled, the
180 Hz components can be damped by -3 dB (approx. 30%). Use this function to remove

carrier components from the inverter output side (secondary side) or if noise is annoying you,
and in similar cases.

21

Tables of Key Operations

HIOKI CM7290A961-03

Key congurations

Key Short press

Sets/cancels HOLD − Disables auto power-save

Lit / Unlit − APS Unlit

Enables or switches the
analysis display function

"MAX": Maximum value
"MIN": Minimum value
"AVG": Average value
PEAK MAX:

Maximum peak value
PEAK MIN:
Minimum peak value

Switches the
measurement mode

: DC measurement
: AC measurement
: AC + DC

measurement

: Frequency

measurement ("Hz")

Switches the
output mode

WAVE: Waveform
RMS: Root mean square
PEAK: Maximum

absolute value
at update time
interval, with
sampling of 2 kS/s

FREQ: Frequency

1-second long

press

Cancels the
analysis display
function

− −

Sets/cancels the
save settings
function

Lit / Unlit

Enable/disable

Bluetooth®
communications
(only for CM7291)

Lit / Unlit
(only for CM7291)

Turn on power

while pressing key

Enables/disables the
buzzer sound

Sets/cancels backlight
auto-off

When enabled, the
backlight will automatically
turn off approximately
40 sec. after the last
operation.

Displays the serial No.

−

22

Tables of Key Operations

HIOKI CM7290A961-03

Key Short press

When using battery power:

• Turn the power on

• After APS has been
disabled, turning on
the power again will
re-enable APS

• Display lights up

• APS Lit

Backlight
On/Off

−

Switches the range

RANGE: AUTO:
Auto ranging

RANGE: MANUAL

Manual ranging

Switches the response
speed

FAST: Fast rate
NORMAL
SLOW: Slow rate

: Medium rate

−

1-second long

press

When using
battery power:

• Turn the power
off

− −

Executes zero
adjustment
(display and
output values
are set to zero
after being
memorized)

The values in
the main display
will change
to zero

Filter functions
Enabled/
disabled

:

Lit / Unlit

− −

Sets/cancels key
lock −

Turn on power

while pressing key

−

Enables/disables zero
adjustment at power-up

0ADJ START

Lit / Unlit

Displays the model
number and software
version

−

Revert to factory settings
(clears saved settings,
etc.)

−

Lit / Unlit

−

23

Tables of Key Operations

HIOKI CM7290A961-03

Key Short press

−

+

−

1-second long

press

Sets/cancels
×10 output

amplication

function

• This operation
can only be
performed
during output
operation.

×10

Lit / Unlit

Turn on power

while pressing key

−

−

24

2

HIOKI CM7290A961-03

Pre-measurement Preparation

2.1 Installing the Z5004 Magnetic Strap

Attach the optional Z5004 Magnetic Strap as required.
The magnet can be used to attach to a wall, such as a metal surface.

Strap slit

Magnet

22

25

Connecting the Sensor

HIOKI CM7290A961-03

2.2 Connecting the Sensor

When the optional current sensor (output connector: Hioki PL14 Connector) (p. 43)

is connected, its type will be automatically recognized, and settings that match the

sensor will be congured automatically (measurement mode, current rating, output

rate).

Insert the output connector of the sensor so that the arrow is aligned with the arrow
on the sensor input connector of the unit.

Connecting a sensor consuming a large current while operating the unit on battery
power with low battery voltage may cause the unit to shut off due to its inability to

supply sufcient power to the sensor.

26

Supplying Power

HIOKI CM7290A961-03

2.3 Supplying Power

Installing/replacing the batteries

When using the unit for the rst time, be sure to install two LR6 alkaline battery (AA)

batteries. Also, before measurement, check that there is adequate power in the
batteries. If there is not, replace the batteries. Batteries can be replaced with the
protector installed. Disconnect the sensor from the conductor to be measured, before
replacing the batteries.

See “Batteries” (p. 10).

IMPORTANT

When
possible.

• When batteries are installed, the unit will switch to battery power when the supply
of power from the AC adapter is interrupted, allowing continued measurement.
(Duration of operation in this state will depend on the sensor connected and the
remaining power of the batteries.)

• After use, always turn OFF the power.

You will need: Phillips screwdriver (No. 2), LR6 alkaline battery (AA) ×2

indicator is lit, the batteries are low. Please replace the batteries as soon as

22

(LR6 × 2)

Check polarity

1, 51, 5

Battery cover

33

2, 42, 4

27

Supplying Power

HIOKI CM7290A961-03

Connecting the AC adapter (optional)

Be sure to read “AC adapter” (p. 9) and “Handling of the cables” (p. 10) before

connecting the AC adapter.

Use the optional AC adapter to supply power from an outlet. When power is supplied
via the AC adapter, the unit will run on AC adapter drive even if batteries are installed.

Connect

2

AC adapter

• When batteries are installed, the unit will switch to battery power when the supply
of power from the AC adapter is interrupted, allowing continued measurement.
(Duration of operation in this state will depend on the sensor connected and the
remaining power of the batteries.)

• The displayed value or output may be affected by switching noise when the unit
switches from battery to AC adapter or vice-versa.

• To disable battery drive when AC adapter power is shut off, remove the batteries.

Connect

3

Outlet

AC adapter jack (external
power supply jack)

Remove cap

1

28

Supplying Power

HIOKI CM7290A961-03

Connecting to an external DC power supply

Be sure to read “Handling of the cables” (p. 10) before connecting the power

supply.

When connecting to an external DC power supply, make sure that the supply has the
correct rating and uses a compatible connector.

See “Power supply” (p. 41).

When power is supplied from an external DC supply, that power supply will receive
priority and the unit will operate on power from the external DC power supply even if
batteries have been installed.

Connection Example

When using an external DC power supply
(other than the optional AC adapter), be sure

to use a power supply connector that qualies
as JEITA RC5320A Classication 3
(EIAJ RC5320A TYPE 3) (grip portion

external diameter not more than φ10 mm).

Display unit

22

The unit must have an exclusive power supply – the optional AC adapter, or an

isolated DC power supply satisfying the power supply specications – that is used

for the unit alone. If the power source is shared with the measurement circuitry, the
zero-point for output values will shift when the load on the measurement circuitry

uctuates, making accurate measurement impossible.

Power
supply

Output

Measurement

circuitry

Measuring system

29

Turning the Power On/Off

HIOKI CM7290A961-03

2.4 Turning the Power On/Off

When using battery power

Turning the power on/off

Turning the power on:
short press

Turning the power off:
long press

When using the AC adapter or an external DC power supply:

The unit will remain on at all times.

Turning the power off

Disconnect the connector from the AC adapter (external power supply) terminal.

30

Connecting to an External Device

HIOKI CM7290A961-03

2.5 Connecting to an External Device

If the unit is to be used in combination with another device, use the output cord
(optional) to connect to the external device.
If the sensor cable is not long enough, use an extension cable (optional).

See “Options” (p. 2).

Insert the output cord all the way into the unit. Otherwise the contacting will be poor
and the measured value will not be output accurately.

Connect*

3

External device

Insert

2

Output cord

Output jack

Remove cap

1

22

*: The connection method will depend on the option(s) used (see below).

Using an L9095 Output Cord:

1

2

BNC

terminal of

external

device

L9095 connector

Align guide with groove to insert

Twist the terminal to the right to
lock it in place

31

Connecting to an External Device

HIOKI CM7290A961-03

32

3

HIOKI CM7290A961-03

Measurement and Output

3.1 Inspection Prior to Use

Inspect the unit and sensor for any damage it may have sustained during storage

or shipment and verify that it is operating properly before use. If you nd any faults,

contact your authorized Hioki distributor or reseller.

Where to check Check item Solution

Cables Any cable's insulation

broken?

Display unit Batteries Sufcient battery power

remaining?

Range Does the range correspond

to the current?

Zero check

Display All LCD segments are

With the AC mode selected,
does the display read 0 A or
close to 0 A?

With the DC mode selected,
does the display read 0 A or
close to 0 A?

displayed?

Do not use the cable. Have it
repaired.

• If the indicator shows

batteries have run low and you

should replace them as soon as
possible.

• If the batteries are low, the unit

may switch off when the backlight
turns on or when a beep tone

sounds.

Check by switching the range with

the [RANGE] key.

If it does not, contact your

authorized Hioki distributor or
reseller.

Perform zero-adjustment with

the [0ADJ] key. Verify that the
displayed value is close to 0 A

while not measuring anything.

Check that all of the LCD's

segments light up (p. 30).
If any does not, have the unit

repaired.

, the

333

33

Taking Measurements

「 シ ー ル ド 線 は 挟 ま な い 」の 説 明 を

記載する/しないは製品ごと技術に確認する
　↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓

OK

NO

NONO

「 シ ー ル ド 線 は 挟 ま な い 」の 説 明 を

記載する/しないは製品ごと技術に確認する
　↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓

NONO

HIOKI CM7290A961-03

3.2 Taking Measurements

Clamp the conductor

2

11

Execute zero
adjustment.

*1

Long press

Measurement modes:

DC

AC

33

Select the

measurement

mode

*2

AC + DC

• To measure current of not more

than 10 Hz, select the AC+DC
mode, and use the [FAST/SLOW]

key to set the response speed to
SLOW.

• Auto ranging will be set. You can

*1: Not needed if zero adjustment at power-up

is enabled (p. 20).

*2:

Not needed if save settings is enabled (p. 20).

alternatively set manual ranging

(p. 16).

• There may be a delay in the display or output during low-input or low-frequency
measurement.

• When measuring a DC current or generating waveform output with the output

function, align the current direction mark with the direction of current ow in the

conductor and clamp the sensor so that the conductor is located roughly in the
center of the sensor.

Load side

Direction of
current

Source side

Conductor to be measured

Direction arrow

34

Taking Measurements

HIOKI CM7290A961-03

Types of output in the different measurement modes

AC/DC

sensor

AC/DC

AC

DC

Hz

• AC+DC mode and AC mode have a frequency band of about 30 kHz
(−3dB) for the wave outputting (WAVE OUT) function.

• Selecting DC mode enables the low-pass lter with a cut-off frequency
of about 1 Hz. Select AC+DC mode to use the wave outputting (WAVE
OUT) with a faster response setting.

AC

sensor

AC

Hz

WAVE RMS PEAK OFF

WAVE RMS PEAK OFF

WAVE OFF

FREQ OFF

CAUTION

333

35

Taking Measurements

HIOKI CM7290A961-03

Setting measurement range

Measurement mode

AC/DC

AC

AC/DC sensor AC sensor

AUTO

*

×10

*

×1

DC Hz

AUTO

*

×100

*

×10

*

×1

AC/DC sensor

AC sensor

AUTO

99.99 Hz

999.9 Hz

9.999 Hz

*: The ranges as a whole with a sensor connected

See “Appx. 1 Range Structure, Output rate, and Power Consumption Category with
a Sensor Connected” (p. 61) for details about the range structure of each of the

sensors.

Enabling OUTPUT will switch the measurement range from AUTO to a manual

range.

Enabling the analysis display (MAX/MIN) will cause a measurement range to be
xed. To change the measurement range, disable the analysis display (MAX/MIN).

36

Changing the Display/output update time (rate) (to Faster or Slower)

HIOKI CM7290A961-03

3.3 Changing the Display/output update time (rate) (to Faster or Slower)

You can change the rate at which the display/output is updated.
(factory settings: NORMAL)

Response speed Time

FAST Fast rate

NORMAL

SLOW Slow rate

See “Display and output update rate” (p. 49).

Short press

3

The display or output may indicate an excessively large value immediately after

switching to SLOW mode.

37

Examples of Measurement Waveforms

DC AC+

HIOKI CM7290A961-03

3.4 Examples of Measurement Waveforms

Table of waveforms

The table below gives examples of the typical waveforms when appropriate settings
are made. See “Accuracy specications (for display unit only)” (p. 45) to check the
accuracy specications for the unit.

:Available, –:Not suitable



(The waveforms shown in the table are typical examples of when appropriate settings are made.)

Measurement

mode and

symbol

DC

*1

Measurement waveform

(The AC waveforms
depict those with a com­mercial frequency or full-

wave rectied.)

Display



–

–

WAVE

(with polarity)

Output

RMS

(no polarity)

PEAK

(no polarity)

AC

AC+DC

2 2

Frequency

Hz

*1: In DC mode, the low-pass lter with a cut-off frequency of approximately 1 Hz is enabled.

Select AC+DC mode when an input signal with fast response is output as a waveform output.

38

–



–









Frequency

Output proportional to frequency

(mV/Hz)

Bluetooth® Communications (only for CM7291)

HIOKI CM7290A961-03

3.5 Bluetooth® Communications (only for CM7291)

The CM7291 supports Bluetooth® (Bluetooth® low energy) .

When the Bluetooth
create measurement reports

on mobile devices (iPhone, iPad, iPad Mini™, iPad Pro™, iPod touch, and Android™
devices). For more information about this functionality, see the help function in the
application software GENNECT Cross.

Install the GENNECT Cross on your mobile

1

device. (p. 35)

Enable the Bluetooth® function on the

2

CM7291.

Launch the GENNECT Cross and pair it with

3

the CM7291. (p. 39)

Select the general measurement, logging,

4

or wave graph function.

®

function is enabled, you can review measurement data and

1-second long
press

Installing the application software GENNECT Cross

Search for “GENNECT Cross” on the App Store from your
iPhone, iPad or other Apple device, or on Google Play™ from
your Android™ device. Then download and install the GENNECT
Cross. You will need an Apple ID to download the app from
the App Store, or a Google account to download the app from
Google Play™. For more information about how to register an
account, contact the store at which you purchased your device.

3

• Because the CM7291 emit radio waves, use in a country or region where they have not
been approved may be subject to nes or other penalties as a violation of applicable laws
or regulations. For more information, see the attached “Precautions Concerning Use of
Equipment That Emits Radio Waves” or go to our website.

• The CM7291 availability is limited to certain countries. For more information, contact your
authorized Hioki distributor or reseller.

• For more information, see the attached “Precautions Concerning Use of Equipment That Emits
Radio Waves.”

• Bluetooth® communications range varies greatly with distance from obstructions (walls, metal

obstruction, etc.) as well as distance from the oor or ground. To ensure stable measurement,
verify adequate signal strength.

• Although this app is provided free of charge, downloading or use of the app may incur Internet
connection charges. Such charges are the sole responsibility of the user.

• This app is not guaranteed to operate on all mobile devices.

39

Bluetooth® Communications (only for CM7291)

HIOKI CM7290A961-03

Pairing the app with the CM7291

11

Home>Other

22

Instrument

Settings

33

The instrument is automatically

registered

44

Return to the home screen.

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

instrument), the instrument settings screen will be displayed.

• While the mobile device is displaying the instrument settings screen, simply move
it close to a CM7291 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.

• For previously registered instruments, the operations described above can be skipped.

Making measurements with the Bluetooth® function

Select the general measurement, logging, or wave graph function on the home
screen. For more information about each function, see the help function in the
GENNECT Cross.

A value displayed in the app and that displayed on the instrument may differ from

each other due to communication delay or discrepancy between display update rates.

A statistical value calculated from logged values and an analytical value displayed on
the instrument may differ from each other.

General Measurement

Saves measured values from

multiple channels

40

Logging

Simple logging (up to 24 hours)

For CM7291, several keys

are disabled while logging is

performed.

Wave Graph

Simple oscilloscope

No waveforms are displayed

during PEAK output or with

Hz function set.

4

HIOKI CM7290A961-03

Specications

4.1 General Specications

Operating
environment

Operating
temperature
and humidity

Storage temperature
and humidity

Dust-proof,
water-proof

Standards

Drop proof 1.5 m when protector is used

Power supply LR6 alkaline battery (AA) × 2, or external power supply 5 V to 15 V

Battery power
warning voltage

Rated power
(Reference values

for 23°C)

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

-25°C to 65°C (-13°F to 149°F), 80% RH or less (non-condensing,
except for battery)

-25°C to 65°C (-13°F to 149°F), 80% RH or less (non-condensing,
except for battery)

IP54 (EN60529) (with AC adapter/power connector cap on and sensor
connected)

Safety EN61010

EMC EN61326

Recommended AC adapters:
9445-02
Rated power supply voltage: 100 V to 240 V AC (allowing for ±10%
voltage uctuation relative to rated power supply voltage)
Rated frequency: 50 Hz or 60 Hz
Expected transient over voltage: 2500 V

ashes prior to power shut-off

In either of the following conditions:

Sensor
power
consumption
category

0 0.3 VA 0.8 VA

1 0.5 VA 1.0 VA

2 0.7 VA 1.2 VA

3 1 VA 1.5 VA

4 1.5 VA 2.0 VA

- With Bluetooth
backlight turned off, and the output
mode set to WAVE

- With Bluetooth® turned OFF, the
backlight turned off, and the output mode
set to RMS

®

turned OFF, the

Maximum rated
power

See “Appx. 1 Range Structure, Output rate, and Power Consumption

Category with a Sensor Connected” (p. 61) for power consumption

categories.

41

General Specications

HIOKI CM7290A961-03

Continuous
operating time

(when batteries
used;
reference values
for 23°C)

Dimensions Approx. 52 mm (2.05″) W × 163 mm (6.42″) H × 37 mm (1.46″) D

Mass Approx. 220 g (7.8 oz.) (with protector, batteries installed)

Product warranty
period

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

Options See “Options” (p. 2).

Sensor
power
consumption
category

0 Approx. 30 hours Approx. 19 hours

1 Approx. 16 hours Approx. 11 hours

2 Approx. 8 hours Approx. 6 hours

3 Approx. 4 hours Approx. 3 hours

4 Approx. 1.4 hours Approx. 1 hours

See “Appx. 1 Range Structure, Output rate, and Power Consumption

Category with a Sensor Connected” (p. 61) for power consumption

categories.

(with protector)

Approx. 48 mm (1.89″) W × 159 mm (6.26″) H × 33 mm (1.30″) D

(without protector)

Approx. 185 g (6.5 oz.) (without protector, batteries not installed)

3 years

In either of the following
conditions:

- With Bluetooth® turned
OFF, the backlight turned
off, and the output mode
set to WAVE

- With Bluetooth
OFF, the backlight turned
off, and the output mode
set to RMS

®

turned

In either of the following
conditions:

- With Bluetooth® turned
ON, the output mode set
to OFF, and the backlight
turned OFF

- With the output mode set
to PEAK, Bluetooth® turned
OFF, and the backlight
turned OFF

42

Input and Output Specications, and Measurement Specications

HIOKI CM7290A961-03

4.2 Input and Output Specications, and
Measurement Specications

(1) Measurement functions and measurable waveforms

See “3.4 Examples of Measurement Waveforms” (p. 38).

(2) Basic Specications

Sensor input connector Hioki PL14

AC measurement method Measurement of true rms

Output impedance 50

PEAK sensing duration 2 ms or greater

Zero-display range 29 count or less for AC and DC+AC RMS values

Crest factor AC or DC+AC

Auto ranging transition
threshold

Warning displays

(±5%)

Ω

(during PEAK MAX/PEAK MIN and PEAK output)

3 (5000 counts) or 2.5 (6000 counts)

Measurement modes

DC, AC, or DC + AC To higher range: 6001 counts or more

Frequency To higher range: 10000 counts or more

OVER Display value has exceeded the instrument range

or the sensor rating

OUTPUT
OVER

When the display value exceeds the output range
while the output mode is PEAK or FREQ

Conditions for transition

To lower range: 539 counts or less

To lower range: 899 counts or less

(3) Basic conditions for accuracy specications

Power supply
voltage range
for guaranteed
accuracy

Conditions of
guaranteed
accuracy

With power ON

Guaranteed accuracy period: 3 years
Guaranteed accuracy period from adjustment made by Hioki: 3 years
Temperature and humidity for guaranteed accuracy: 23°C±5°C (73°F
±9°F), 80% RH or less
Zero-adjustment executed

43

Input and Output Specications, and Measurement Specications

HIOKI CM7290A961-03

Measurement
response time
and AC accuracy
guaranteed
frequency range by
response speed

Temperature
coefcient

Maximum extension
length

Condition for AC
guaranteed accuracy

Effect of radiated
radio-frequency
electromagnetic eld

Effect of conducted
radio-frequency
electromagnetic eld

Response speed

Measurement

response time

FAST 0.3 s 45 Hz ≤ f ≤ 1 kHz

NORMAL 0.8 s 10 Hz ≤ f ≤ 1 kHz

SLOW 5.0 s 3 Hz ≤ f ≤ 1 kHz

AC accuracy guaranteed

*1

frequency range

*2

*2

*2

*1 Time required for the RMS output value to fall within the

accuracy specications range when the input is varied from
10% to 90% with the range xed

*2 For values of f such that 66 Hz ≤ f ≤ 1 kHz, the range is dened

only with the lter set to OFF.

Within the operating temperature range, add measurement accuracy
× 0.1/°C (except 23°C ± 5°C).

100 m (but will depend on device connected to)

Sine wave input

15% f.s. at 10 V/m

10% f.s. at 3 V

(4) Range breakdown

Range

Resolution

(dgt.)

×100 0.001 mV - 6.000 mV

×10 0.01 mV ±60.00 mV 60.00 mV 0.1 mV ±150.0 mV

×1 0.1 mV ±600.0 mV 600.0 mV 1 mV ±1500 mV Maximum display

44

Input voltage range

DC

AC or

DC + AC

(AC only)

Peak

resolution

(dgt.)

Peak input

range

(AC or

DC + AC)

0.01 mV ±15.00 mV
(AC only)

Notes

FAST and
NORMAL
only; valid for
supported
sensors only.

range depends
on the connected
sensor

Input and Output Specications, and Measurement Specications

HIOKI CM7290A961-03

(5) Accuracy specications (for display unit only)

1. DC display (Measured value/MAX/MIN/AVG DC value), coupling method: DC coupling

Range

×1, ×10 DC ±0.3% rdg. ±8 dgt.

2. AC display, coupling method: AC coupling

• AC rms value (Measured value/MAX/MIN/AVG rms)

Range

×100 10 Hz ≤ f < 45 Hz ±1.8% rdg. ±15 dgt.

×1, ×10 3 Hz ≤ f < 10 Hz ±1.2% rdg. ±10 dgt.

*1: Add ±5 dgt. to this accuracy when operating in SLOW mode.
*2: When the lter is set to ON: Specied with a reading of 300 dgt. or more.

When the lter is set to OFF: Specied with a reading of 400 dgt. or more.

*3: Specied with a reading of 300 dgt. or more.
*4: When the lter is set to ON, add ±0.5% rdg. ±5 dgt. to this accuracy.

Accuracy guarantee

frequency range

Accuracy guarantee

frequency range

Measurement accuracy

Measurement accuracy

45 Hz ≤ f ≤ 66 Hz ±1.3% rdg. ±13 dgt.

66 Hz < f ≤ 1 kHz ±2.0% rdg. ±15 dgt.

10 Hz ≤ f < 45 Hz ±0.8% rdg. ±10 dgt.

45 Hz ≤ f ≤ 66 Hz ±0.3% rdg. ±8 dgt.

66 Hz < f ≤ 1 kHz ±1.0% rdg. ±10 dgt.

*2 *4

*2 *4

*2 *4

*3 *4

*1 *3 *4

*1 *3 *4

*1 *3 *4

• AC peak (PEAK MAX/PEAK MIN Zero-to-Peak)

Range

×100 10 Hz ≤ f ≤ 66 Hz ±2.5% rdg. ±12 dgt.

×1, ×10 3 Hz ≤ f < 10 Hz ±2.5% rdg. ±7 dgt.

*1: When the lter is set to ON, add ±0.5% rdg. to this accuracy.
*2: When the lter is set to ON: Specied with a reading of 45 dgt. or more.

When the lter is set to OFF: Specied with a reading of 60 dgt. or more.

Accuracy guarantee

frequency range

Measurement accuracy

10 Hz ≤ f ≤ 66 Hz ±2.5% rdg. ±7 dgt.

*1 *2

*1

*1

45

Input and Output Specications, and Measurement Specications

HIOKI CM7290A961-03

3. DC+AC display, coupling method: DC coupling

• DC+AC rms value (Measured value/MAX/MIN/AVG rms)

Range

×1, ×10 DC ±1.5% rdg. ±15 dgt.

Accuracy guarantee

frequency range

Measurement accuracy

3 Hz ≤ f < 10 Hz ±1.2% rdg. ±12 dgt.

10 Hz ≤ f < 45 Hz ±0.8% rdg. ±12 dgt.

45 Hz ≤ f ≤ 66 Hz ±0.3% rdg. ±12 dgt.

66 Hz < f ≤ 1 kHz ±1.0% rdg. ±12 dgt.

*1

*1

*1

*1

*1

*1: Add ±0.5% rdg. to this accuracy when the lter is set to ON. Specied with a reading

of 300 dgt. or more.

• DC+AC peak (PEAK MAX/PEAK MIN Zero-to-Peak)

Range

×1, ×10 DC ±2.5% rdg. ±7 dgt.

Accuracy guarantee

frequency range

Measurement accuracy

3 Hz ≤ f < 10 Hz ±2.5% rdg. ±7 dgt.

10 Hz ≤ f ≤ 66 Hz ±2.5% rdg. ±7 dgt.

*1

*1

*1

*1: Add ±0.5% rdg. to this accuracy when the lter is set to ON.

4. Frequency display (Measured value/MAX/MIN/AVG), coupling method: AC coupling
In AC mode: simultaneous display (Factory setting is sub display. Can be switched to main
display with [AC/DC/Hz] key.)
With the sub display, the frequency range is set automatically. With the main display, the
frequency range can be switched using [RANGE] key.
Minimum sensitivity: 300 dgt. or more
When the frequency or the AC value is out of the measurement range, "----Hz" is displayed.

Frequency range

(Accuracy guarantee range)

9.999 Hz (1.000 Hz to 9.999 Hz)

*1

Resolution Measurement accuracy

0.001 Hz ±0.2% rdg. ±0.002 Hz

99.99 Hz (9.00 Hz to 99.99 Hz) 0.01 Hz ±0.1% rdg. ±0.01 Hz

999.9 Hz (90.0 Hz to 999.9 Hz) 0.1 Hz ±0.1% rdg. ±0.1 Hz

*1: The display range starts from 0.950 Hz.

5.

DC output

Range Output type

×1, ×10 WAVE DC ±0.5% rdg. ±0.8 mV

*1: When using the ×10 output amplication function, add ±0.3% rdg. to this accuracy and

multiply the error in millivolt by 10. (Also, multiply the f.s. error of the sensor by 10.)

46

Accuracy guarantee

frequency range

Output accuracy

*1

Input and Output Specications, and Measurement Specications

HIOKI CM7290A961-03

6. AC output

Range

Output

type

×100 WAV E 10 Hz ≤ f < 45 Hz ±2.0% rdg. ±1.5 mV

Accuracy guarantee

frequency range

Output accuracy

*2 *5

45 Hz ≤ f ≤ 66 Hz ±1.5% rdg. ±1.3 mV, phase ±0.2 deg.

66 Hz < f ≤ 1 kHz ±2.2% rdg. ±1.5 mV

RMS 10 Hz ≤ f < 45 Hz ±2.0% rdg. ±1.5 mV

45 Hz ≤ f ≤ 66 Hz ±1.5% rdg. ±1.3 mV

66 Hz < f ≤ 1 kHz ±2.2% rdg. ±1.5 mV

PEAK 10 Hz ≤ f ≤ 66 Hz ±2.5% rdg. ±12 mV

×1, ×10 WAVE 3 Hz ≤ f < 10 Hz ±1.4% rdg. ±1.2 mV

10 Hz ≤ f < 45 Hz ±1.0% rdg. ±1.0 mV

*2 *5

*2 *5

*2 *5

*2 *5

*2 *4

*2 *3

*2

45 Hz ≤ f ≤ 66 Hz ±0.5% rdg. ±0.8 mV, phase ±0.2 deg.

66 Hz < f ≤ 1 kHz ±1.2% rdg. ±1.0 mV

RMS 3 Hz ≤ f < 10 Hz ±1.4% rdg. ±1.2 mV

10 Hz ≤ f < 45 Hz ±1.0% rdg. ±1.0 mV

45 Hz ≤ f ≤ 66 Hz ±0.8% rdg. ±0.8 mV

66 Hz < f ≤ 1 kHz ±1.2% rdg. ±1.0 mV

PEAK 3 Hz ≤ f < 10 Hz ±2.5% rdg. ±7 mV

10 Hz ≤ f ≤ 66 Hz ±2.5% rdg. ±7 mV

*2

*1 *2 *3

*1 *2

*1 *2

*1 *2

*2 *3

*2

*1: Add ±2.0 mV to this accuracy when measuring an input below 300 dgt.
*2: Add ±0.5% rdg. ±0.5 mV to this accuracy when the lter is set to ON.

When using the ×10 output amplication function, add ±0.3% rdg. to this accuracy and

multiply the error in millivolt by 10. (Also, multiply the f.s. error of the sensor by 10.)

The phase accuracy is specied when the lter is set to OFF, and the response rate is

set to FAST or NORMAL.

*3: Accuracy for measurements below 3 mV with frequencies in the range of 3 Hz ≤ f <

10 Hz is designed only.

*4: When the lter is set to ON: Specied with a reading of 45 dgt. or more.

When the lter is set to OFF: Specied with a reading of 60 dgt. or more.

*5: When the lter is set to ON: Specied with a reading of 300 dgt. or more.

When the lter is set to OFF: Specied with a reading of 400 dgt. or more.

*2 *5

*2

47

Input and Output Specications, and Measurement Specications

HIOKI CM7290A961-03

7. DC+AC output

Range

Output

×1, ×10 WAVE DC ±1.5% rdg. ±1.2 mV

RMS DC ±1.7% rdg. ±1.2 mV

PEAK DC ±2.5% rdg. ±7 mV

Accuracy guarantee

type

frequency range

3 Hz ≤ f < 10 Hz ±1.4% rdg. ±1.2 mV, phase (design value)

±0.2 deg.

Output accuracy

*2

*2 *3

10 Hz ≤ f < 45 Hz ±1.0% rdg. ±1.2 mV, phase ±0.2 deg.

45 Hz ≤ f ≤ 66 Hz ±0.5% rdg. ±1.2 mV, phase ±0.2 deg.

66 Hz < f ≤ 1 kHz ±1.2% rdg. ±1.2 mV

3 Hz ≤ f < 10 Hz ±1.4% rdg. ±1.2 mV

10 Hz ≤ f < 45 Hz ±1.0% rdg. ±1.2 mV

45 Hz ≤ f ≤ 66 Hz ±0.8% rdg. ±1.2 mV

66 Hz < f ≤ 1 kHz ±1.2% rdg. ±1.2 mV

3 Hz ≤ f < 10 Hz ±2.5% rdg. ±7 mV

10 Hz ≤ f ≤ 66 Hz ±2.5% rdg. ±7 mV

*2

*1 *2

*1 *2 *3

*1 *2

*1 *2

*1 *2

*2

*2 *3

*2

*2

*2

*1: Add ±2.0 mV to this accuracy when measuring an input of 300 dgt. or below.
*2: Add ±0.5% rdg. ±0.5 mV to this accuracy when the lter is set to ON.

When using the ×10 output amplication function, add ±0.3%rdg. to this accuracy and

multiply the error in millivolt by 10.(Also, multiply the f.s. error of the sensor by 10.)

The phase accuracy is specied when the lter is set to OFF.

*3: For values of f such that 3 Hz ≤ f < 10 Hz, the output accuracy for voltages of 3 mV or

less is provided as a design value.

8. Frequency output, coupling method: AC coupling
Minimum sensitivity: 300 dgt. or more
Frequency range switchable using RANGE.

9.999 Hz (1.000 Hz to 9.999 Hz) ±0.4% rdg. ±2.3 mV 100 mV/Hz

99.99 Hz (9.00 Hz to 99.99 Hz) ±0.3% rdg. ±2.2 mV 10 mV/Hz

999.9 Hz (90.0 Hz to 999.9 Hz) ±0.3% rdg. ±2.2 mV 1 mV/Hz

48

Frequency range

(Accuracy guarantee range)

Output accuracy Output rate

4.3 Functional Specications

HIOKI CM7290A961-03

(1) Display and output update rate

Functional Specications

Output

mode

Disabled SLOW 1.0 s (1 time/s)

WAVE SLOW 1.0 s (1 time/s) (Analog output) −

RMS SLOW 1.0 s (1 time/s) (Analog output) −

PEAK SLOW 1 s (1 time/s) 1 s (1 time/s) With sampling of

FREQ 9.999 Hz

*1: For frequency display only: 3.0 s (1 time/3 s), same as FREQ.

Response speed

or frequency

range

NORMAL 0.2 s (5 times/s)

FAST 0.2 s (5 times/s)

NORMAL 0.2 s (5 times/s) −

FAST 0.2 s (5 times/s) −

NORMAL 0.2 s (5 times/s) −

FAST 0.2 s (5 times/s) −

NORMAL 0.2 s (5 times/s) 0.2 s (5 times/s)

FAST 0.2 s (5 times/s) 0.02 s (50 times/s)

range

99.99 Hz
range

999.9 Hz
range

Display update

rate

3.0 s (1 time/3 s) 3.0 s (1 time/3 s) −

0.2 s (5 times/s) 0.2 s (5 times/s) −

0.2 s (5 times/s) 0.2 s (5 times/s) −

Output update rate Notes

*1

No output −

2 kS/s, maximum
absolute value at
update time interval is
output.

49

Functional Specications

HIOKI CM7290A961-03

(2) Functions and their factory settings

No. Functions Description

1 Measurement

modes

2 Display/output

update time (rate)

3 Ranging Auto: Optimal range is selected automatically

4 Hold Puts display value updating on hold (manual)

5 Zero-adjustment Resets the display value to zero, after

6 Analysis display

(MAX/MIN/AVG/
PEAK MAX/
PEAK MIN display)

7 Filter

(for AC or DC+AC)

8 Display backlight Lit/unlit (manual setting) for white-colored

DC, AC, DC + AC, or FREQ DC + AC

Display and output update time (rate) NORMAL

RANGE: AUTO lights up
Manual: Range is selected manually
RANGE: MANUAL lights up
When output becomes valid during auto­range operation, auto-range operation will
be disabled and the range will be set to the
present range.

lights up

memorizing it

The following are displayed (in the main
display) in the order given from the start of
analysis display:

Maximum value (MAX)
Minimum value (MIN)
Average value (AVG)
Maximum peak value (PEAK MAX)

Minimum peak value (PEAK MIN)
Current instantaneous value displayed in sub
display
* The peak values are 0-to-peak values

(displayed with polarity)

lights up
While the analysis display is active, PEAK
output, auto ranging and range switching
cannot be performed.
During PEAK output operation, only PEAK
MAX and PEAK MIN are displayed. MAX/MIN/
AVG cannot be displayed.

Low-pass lter (180 Hz), pass-band setting

OFF/ON

lights up

backlight
Automatically turns off after approx.
40 seconds after the last operation.

Factory settings

and notes

Factory settings:
RANGE: AUTO

OFF

Factory setting
value, or last
memorized value

Factory setting:
OFF

Factory setting is
OFF

Turned OFF at
power-up

50

Functional Specications

HIOKI CM7290A961-03

No. Functions Description

9 Warning displays If input exceeds the range, the range f.s. value

is displayed with OVER segments ashing.
When output peak exceeds the range, the

10 Auto power

save
(APS)

11 Battery power

warning display

12 External power

source

13 Backlight auto-off Automatically turns off the backlight Factory setting:

14 Buzzer sound Buzzer sound Factory setting:

15 Power-on option Turn on the power while pressing key

16 Save settings Congures the settings mode at startup.

Power is switched off if no operation is
performed for approx. 10 minutes
When this function is enabled, APS lights up
The APS becomes disabled in one of the
following conditions:
Automatically disabled during output or during
MAX/MIN/AVG display
When being driven by an AC adapter.
When the key lock is activated.

When the APS is disabled (p. 22).

Displays battery remaining power −

When using power from the AC adapter
terminal (external power supply terminal), the
unit is always on, and the

See “Tables of Key Operations” (p. 15).

Pressing the [MODE SAVE/RESET] key
when

the current measurement mode to the startup
mode.

Pressing the [MODE SAVE/RESET] key

setting.

this command or when startup up with it
enabled.
mode or setting is changed.

lights up

is lit up will cancel

will light up when

lights up.

is not lit up will set

the saved

performing

will turn off when the

when

Factory settings

and notes

−

Enabled, but will
be disabled by
power-on option

−

enabled

enabled

−

Factory setting:
OFF (disabled)

17 Output Output varies with the designated mode.

Can be output simultaneously with the
analysis display function (other than PEAK
output).
Output is ground output when the output mode
is disabled.

Factory setting:
OFF

51

Functional Specications

HIOKI CM7290A961-03

No. Functions Description

18 Key lock Disables all key operations (except canceling

of key lock)
However, turning the power ON/OFF is
possible

is displayed

19 Zero adjustment at

power-up

20 Output

amplication ×10

Executes zero adjustment at power-up

is displayed

Makes output 10 times higher than normal

• Output ranges:

WAVE: ±5 V ±0.3 V
RMS: 0 V to 5 V ±0.3 V

PEAK, FREQ: 0 V to 2.3 V ±0.1 V

• Screen display: ×10 lights up

21 Error displays Displays fault diagnosis results when the

power is turned on

22 Serial No. display Displays the serial No.

23 External

communications
(only for CM7291)

Bluetooth
Bluetooth

Bluetooth

®

function off: mark turns off

®

function on:

®

function on/communications active:

mark lights up

mark ashes

(3) Key input conguration

See “Tables of Key Operations” (p. 15).

Factory settings

and notes

Factory setting:
OFF

Factory setting:
OFF

Factory setting:
OFF
(output

amplication ×1)

−

Factory setting:
OFF

(4) LCD display method

FSTN-type liquid crystal display, 1/3 bias, 1/6 duty dynamic drive

See “Display” (p. 13).

52

Connection Terminal Specications

HIOKI CM7290A961-03

4.4 Connection Terminal Specications

Item Symbol Notes

Output jack OUTPUT Diameter 3.5 mm monaural pin-jack

DC external power
supply

5 V to 15 V and

JEITA RC5320A Classication 3
(EIAJ RC5320A TYPE 3)
(Grip portion external diameter not
more than φ10 mm)

4.5 External Interface Specications

(only for CM7291)

Display function Display of measured values on a smartphone or a tablet while using

Bluetooth

Interface

Maximum
antenna power

Communications
range

Communications
range

Supported
devices

Bluetooth

+0 dBm (1 mW)

Approx. 10 m (line of sight)

GATT (Generic Attribute Prole)

Android 4.3 or later, iOS 10 or later
(only for Bluetooth

®

communications.

®

4.0LE ( )

®

low energy models)

53

External Interface Specications (only for CM7291)

HIOKI CM7290A961-03

54

HIOKI CM7290A961-03

5

Maintenance and Service

Cleaning

IMPORTANT

Never use solvents such as benzene, alcohol, acetone, ether, ketones, thinners or
gasoline, as they can deform and discolor the case.

• Dirt on the mating surfaces of the sensor's jaws will degrade measurement,
so keep the surfaces clean by gently wiping with a soft cloth.

• Clean the display area by wiping it gently with a soft dry cloth.

Calibration

How often you should calibrate the unit will depend on the usage conditions and the
environment. Determine a calibration interval that is suited to your usage conditions
and environment, and request to have calibration done by Hioki.

Precautions when transporting the unit

• To avoid damage to the unit, remove the accessories and optional equipment from
the unit. Moreover, be sure to pack in a double carton. Damage occurring during
transportation is not covered by the warranty.

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

Disposal

Dispose of the unit in accordance with local regulations.

55

Troubleshooting

HIOKI CM7290A961-03

5.1 Troubleshooting

Troubleshooting checklist

If you feel that the unit may be malfunctioning, contact your authorized Hioki
distributor or reseller after carrying out the checks below.

Problem Check Solution See

• Power will not
turn on

• Power shuts off
during operation

indicator

ashes

Keys do not work

When AC adapter is used:

• Is the AC adapter inserted all
the way into the AC adapter
jack or outlet?

• Does the power supply
being used conform to the

designated specications?

• Does the power turn on
with battery power supply
(although not with the AC
adapter)?

When batteries are used:

• Have the batteries run low? • If they have, replace them

• Have the batteries passed
their expiration date?

• Are the contacting portions
of the battery holder
damaged or corroded?

−

• Is indicator lit? • Key lock function is on.

• Insert it all the way in.

• Use a power supply of the

designated specications.

• If the power turns on with
battery power supply, the
AC adapter is probably
faulty. Replace it with an AC

adapter of the specied type.

with new ones.

• If they have, replace them
with new ones.

• Even unused batteries may

not provide sufcient power

due to current discharge.

• The unit needs to be
repaired. Contact your

authorized Hioki distributor
or reseller for repair.

• The batteries have run low.
Replace with new batteries.

• Press and hold [AC/DC

Hz] and [RANGE] keys

simultaneously for one
second to cancel key lock.

p. 28

p. 27

p. 14
p. 27

−

56

Problem Check Solution See

HIOKI CM7290A961-03

Display will not
reset to zero

The display goes off
immediately.

Display value is
lower than expected

• Has DC or AC+DC
measurement mode been
selected?

• Is the possible range for
zero adjustment exceeded?

×1 range Approx.

± 80 dgt.

×10 range Approx.

± 800 dgt.

• Is the response speed set to
SLOW?

• Is auto-power-save function
(APS) enabled?

Current measurement

• Are the sensor jaw tips
damaged?

• Are the sensor jaws tightly
closed?

• Is the measurement mode
suitable?

• The method for executing
zero adjustment in the DC or
AC+DC measurement mode
is correct?

• Are you measuring a current

of 10 Hz or lower?

• Has SLOW been set with
auto ranging?

• Execute zero adjustment.

• If the range is exceeded,
the current sensor must be
repaired.

• If the response speed is set
to SLOW, the display may
not read zero immediately.

• Disable auto power-save
function (APS).

• Is damage is evident, have it
repaired.

• Close them tightly. If they
are not properly closed, the
value will be low.

• Select a measurement
mode that is suitable for the
conductor to be measured.

• Execute zero adjustment.
A lower than expected
display value will result if
the measurement are made
while the unit is displaying a
negative value.

• To measure current of not

more than 10 Hz, select the

AC+DC mode, and set the
display/output update rate to
SLOW.

• With SLOW, measurement
of rapid variation is not
possible. Set NORMAL or
FAST.

Troubleshooting

p. 16

−

p. 17

p. 22

−

−

p. 16

p. 16

p. 16

p. 37

57

Troubleshooting

HIOKI CM7290A961-03

Problem Check Solution See

Display value is
lower than expected

• Is the lter function being
used

• Does the

ash?

• Does the frequency of the
current being measured fall

outside the range dened
in the product specications

(for either the unit or the
current sensor)?

• Has the peak value
exceeded the product

specication?

Frequency measurement

• Are you measuring a special
waveform - of an inverter,
etc.?

• Is the current input value 300
dgt. or more of the range?

indicator

• Disable the lter function.

• If components of 60 Hz or
higher are present, the value
will be low.

• The batteries have run low.
Replace with new batteries.

• Use a current sensor
that conforms with the

specications.

• If the inverter's carrier
frequency is high, the display
value will be lower than the
total rms value.

• If possible, use a larger
current range.

• If that is not possible, use a
current sensor that conforms

with the specications.

• In frequency measurement,
a frequency value is
calculated from a count of
the number of times that a
particular threshold value is
exceeded. This means that
even in the case of a special
waveform, it may be possible
to measure it by changing
the mode – AC or AC+DC,
etc. – or changing the range.

• Use an appropriate range
and/or an appropriate
current sensor.

p. 22

p. 27

p. 45

p. 16

−

p. 16

58

Problem Check Solution See

HIOKI CM7290A961-03

Output value is
lower than expected

Display value
is higher than
expected

• Is the output cord inserted all
the way into the output jack?

• Has a wire snapped?

• Has the wrong output mode
been selected?

• Does the value show the
output for the recently set
mode?

Connected instrument

• Is AC coupling being used?

• Is the lter function enabled? • Disable the lter function. p. 22

Current measurement

• Are the current sensor tips
damaged?

• The method for executing
zero adjustment in the DC or
AC+DC measurement mode
is correct?

• Does the current contain
frequency components other
than those expected?

• Is a large magnetic or

electric eld, or large noise,

being generated nearby?

• Does the

ash?

• Has the power source been
switched from the batteries
to an AC adapter or vice­versa during peak current
measurement?

indicator

• Carry out the same checks
as for "Display value is lower
than expected."

• Insert it all the way in.

• If a wire has snapped,
replace the cord with a new
one.

WAVE: Waveform
RMS: Root mean square
PEAK: Maximum absolute

value at update time
interval, with sampling

of 2 kS/s

FREQ: Frequency

• If a DC waveform is being
measured, AC coupling will
result in almost no output.
Select the DC or AC+DC
mode.

• If damage is evident, have it
repaired.

• Execute zero adjustment.
A higher than expected
display value will result if
measurement are made
while the unit is displaying a
positive value.

• Use waveform output
(WAVE) to check the
waveform.

• Distance the unit from the
noise generation source. −

• The batteries have run low.
Replace with new batteries.

• Noise may be generated
when the power supply
is switched. If this noise
causes problems during
measurement, take steps to
ensure that the unit does not
switch power supplies.

Troubleshooting

−

p. 31

p. 17

−

−

p. 16

p. 38

p. 14
p. 27

p. 27

59

Error Displays

HIOKI CM7290A961-03

Problem Check Solution See

Display value
is higher than
expected

Output value
is higher than
expected

Display value

uctuates

Frequency measurement

• Is a large magnetic or electric

eld, or large noise, being

generated nearby?

• Is the current input value 300
dgt. or more of the current
range?

• Are you measuring a full-

wave rectied waveform?

• Has the correct output mode
been selected?

• Any poor contacting of the
sensor cables, etc.?

• Does the display/output
update time (rate) selected
match the current's
frequency?

• Distance the unit from the
noise generation source. −

• Use an appropriate range
and/or an appropriate current
sensor.

• If you are, the frequency will

be double its pre-rectication

level.

WAVE: Waveform
RMS: Root mean square
PEAK: Maximum absolute

value at update time
interval, with sampling

of 2 kS/s

FREQ: Frequency

• Have the item(s) repaired if
you suspect poor contacting.

• Change the response speed
and set the display/output
update time (rate) according
to the current’s frequency.

p. 16

−

p. 17

−

p. 37

5.2 Error Displays

If any of these errors is displayed in the LCD display area, repair is required. Contact
your authorized Hioki distributor or reseller for repair.

Error display Cause

Err 001

Err 002

Err 004

Err 005

Err 008

60

ROM error
Program

ROM error
Adjustment data

EEPROM error
Memory data

ADC error
Hardware failure

Bluetooth
Hardware malfunction

(only for CM7291)

®

error

Corrective action/more

information

If any of these errors is displayed in
the display area, repair is required.

Contact your authorized Hioki
distributor or reseller for repair.

Appendix

HIOKI CM7290A961-03

Appx. 1

/

)

)

1

CT7731

CT7631

(

(

category*

Unit’s range Sensor ’s range

output rate

2

×1 ×1 1

1 mV/A

consumption

Sensor power

Range configuration

(for calculating accuracy)

Sensor’s

Output rate

(WAVE, RMS, PEAK)

Range Structure, Output rate, and
Power Consumption Category
with a Sensor Connected

/

/

)

CT7636

(

×1 ×1 1

)

CT7736

(

2

1 mV/A

)

)

CT7742

CT7642

(

(

2

×1 ×1 1

0.1 mV/A

1

×1 ×10

1 mV/A

×1 ×1

06.000 A 0.001 A 100 mV/A ×10 ×1

10 mV/A

0

×1 ×1

1 mV/A

×1 ×1

060.00 A 0.01 A 10 mV/A ×10 ×1

1 mV/A

×1 ×1

0600.0 mA 0.1 mA 1 mV/mA ×10 ×1

100 mV/A

(FREQ)

Output rate

9.999 Hz 100 mV/Hz

99.99 Hz 10 mV/Hz

999.9 Hz 1 mV/Hz

Minimum

resolution

Range

Structure

Rated

sensor

current of

Sensor type

sensor

Connected

60.00 A 0.01 A 10 mV/A ×10 ×1

100.0 A 0.1 A 1 mV/A

AC/DC Sensor 100 A

CT7631

CT7731

60.00 A 0.01 A 10 mV/A ×10 ×1

600.0 A 0.1 A 1 mV/A

AC/DC Sensor 600 A

CT7636

CT7736

2000 A 1 A 0.1 mV/A

600.0 A 0.1 A 1 mV/A ×10 ×1

AC/DC Sensor 2000 A

CT7642

CT7742

6000 A 1 A 0.1 mV/A 0.1 mV/A ×1 ×1

600.0 A 0.1 A 1 mV/A

AC Sensor 6000 A

CT7044

CT7045

60.00 A 0.01 A 10 mV/A

60.00 A 0.01 A 10 mV/A ×10 ×10

CT7046

CT7126 AC Sensor 60 A

600.0 mA 0.1 mA 1 mV/mA ×100 ×1

100.0 A 0.1 A 1 mV/A

60.00 A 0.01 A 10 mV/A ×10 ×1

CT7131 AC Sensor 100 A

600.0 A 0.1 A 1 mV/A

CT7136 AC Sensor 600 A

6.000 A 0.001 A 100 mV/A ×100 ×1

6.000 A 0.001 A 100 mV/A

60.00 mA 0.01 mA 10 mV/mA ×100 ×1

Appx.

Connected sensor Unit’s frequency range

CT7116 AC Sensor 6 A

*1:See “4.1 General Specications”(p. 41) for details about the sensor power consumption

category.

Common to all the sensors

61

Calculating Accuracy when Used with a Sensor

HIOKI CM7290A961-03

Appx. 2 Calculating Accuracy when

Used with a Sensor

Calculating accuracy of displayed value (calculation
procedure)

Collect data required to calculate accuracy.

1

Unit (CM7290, CM7291) Sensor

• Display rdg. accuracy

• dgt. accuracy

• Minimum resolution

Calculate the following accuracy: (1) Combinational rdg.

2

• rdg. accuracy

• f.s. accuracy

• Rated measurement current

accuracy, and (2) Combinational amperage accuracy.

Display rdg. accuracy

dgt. accuracy

×

Minimum resolution

Calculate the accuracy of displayed value.

3

+

+

rdg. accuracy

f.s. accuracy

×

Rated measurement

current

…(1) Combinational

rdg. accuracy

…(2) Combinational

amperage
accuracy

(1) Combinational rdg. accuracy

accuracy = Accuracy of displayed value

62

×

Displayed value

+

(2) Combinational amperage

Calculating Accuracy when Used with a Sensor

HIOKI CM7290A961-03

Calculation example

Unit’s display: 58.00 A (displayed value), 60 Hz (×10 range setting, AC)
Sensor: CT7631 (rated current: 100 A, output rate: 1 mV/A)

Collect data required to calculate accuracy. (See p. 45, p. 61,

1

and Instruction manuals of sensors)

Unit (CM7290, CM7291) Sensor (CT7631)

• Display rdg. accuracy

±0.3% rdg.

• dgt. accuracy

±8 dgt.

• Minimum resolution

0.01 A

Calculate the following accuracy: (1) Combinational rdg.

2

accuracy, and (2) Combinational amperage accuracy.

±

0.3%

rdg.

+

±

• rdg. accuracy

±1.0% rdg.

• f.s. accuracy

±0.5% f.s.

• Rated measurement current

rdg.

1.0%

100 A

= ±1.3% rdg.

…(1) Combinational

rdg. accuracy

Calculate the accuracy of displayed value.

3

±1.3% rdg. × 58.00 A ± 0.58 A = ±1.334 A

(1) Combinational

rdg. accuracy

The accuracy for an input current of 58.00 A is ±1.334 A.

±8 dgt.

×

A

0.01

+

Displayed
value

±

0.5%

100

(2) Combinational

amperage accuracy

f.s.

×

A

= ±0.58 A

…(2) Combinational

amperage
accuracy

Appx.

63

Calculating Accuracy when Used with a Sensor

HIOKI CM7290A961-03

Calculating accuracy of wave-output value (calculation
procedure)

Collect data required to calculate accuracy.

1

Unit (CM7290, CM7291) Sensor

• Output rdg. accuracy

• Millivolt accuracy

• Output rate

Calculate the following accuracy: (1) Combinational rdg.

2

• rdg. accuracy

• f.s. accuracy

• Rated measurement current

accuracy, and (2) Combinational millivolt accuracy.

Output rdg. accuracy

Millivolt accuracy

+

+

rdg. accuracy

Output rate

×

…(1) Combinational

rdg. accuracy

f.s. accuracy

×

Rated measurement

current

…(2) Combinational

millivolt
accuracy

Calculate the accuracy of output value.

3

(1) Combinational rdg. accuracy × Output value + (2) Combinational millivolt accuracy

= Accuracy of output value

64

Calculating Accuracy when Used with a Sensor

HIOKI CM7290A961-03

Calculation example

Output value: 580 mV (output value when 58 A current is measured), 60 Hz (×10

range setting, AC)
Sensor: CT7631 (rated current: 100 A, output rate: 1 mV/A)

Collect data required to calculate accuracy. (p. 47, p. 61, and

1

Instruction manuals of sensors)

Unit (CM7290, CM7291) Sensor (CT7631)

• Output rdg. accuracy

±0.5% rdg.

• Millivolt accuracy

±0.8 mV

• Output rate

10 mV/A

Calculate the following accuracy: (1) Combinational rdg.

2

accuracy, and (2) Combinational millivolt accuracy.

±

0.5%

rdg.

+

±

1.0%

• rdg. accuracy

±1.0% rdg.

• f.s. accuracy

±0.5% f.s.

• Rated measurement current

100 A

rdg.

= ±1.5% rdg.

…(1) Combinational

rdg. accuracy

Calculate the accuracy of output value.

3

±1.5% rdg. × 580 mV ± 5.8 mV = ±14.5 mV

(1) Combinational

rdg. accuracy

The accuracy for an output voltage of 580 mV is ±14.5 mV.

±

0.8

mV

Output
value

+

(2) Combinational

millivolt accuracy

10

mV/A

×

= ±5.8 mV

…(2) Combinational

millivolt accuracy

±

0.5%

100

f.s.

×

A

Appx.

65

Combinational Accuracies (Representative values)

HIOKI CM7290A961-03

Appx. 3 Combinational Accuracies

(Representative values)

To see tables listing all the combinational accuracies, visit Hioki’s website.

±2.7% rdg. ±6.2 mV ±1.8% rdg. ±6.2 mV

±2.7% rdg. ±1.7 mV ±1.8% rdg. ±1.7 mV

AC + DC function

(±2.0°)

(±2.0°)

±1.5% rdg. ±6.2 mV

±1.5% rdg. ±1.7 mV

DC function AC function AC + DC function

Accuracy guaranteed range of current

CM7290 (CM7291) + CT7631/CT7731

Accuracy of displayed value

66

±1.3% rdg. ±1.3 A ±1.3% rdg. ±1.3 A ±2.5% rdg. ±2.0 A ±1.3% rdg. ±1.7 A

100.0 A

≤
I
≤

30.0A

measurement

DC AC/AC+DC DC 45 Hz ≤ f ≤ 66 Hz DC 45 Hz ≤ f ≤ 66 Hz

100.0 A 0.0 A ≤| I | ≤ 100.0 A

60.00 A 0.00 A ≤| I | ≤ 60.00 A 3.00A ≤ I ≤ 60.00 A ±1.3% rdg. ±0.58 A ±1.3% rdg. ±0.58 A ±2.5% rdg. ±0.65 A ±1.3% rdg. ±0.62 A

Instrument range

DC function AC function

WAVE output WAVE output (phase) RMS output

measurement

WAVE RMS DC 45 Hz ≤ f ≤ 66 Hz

Accuracy guaranteed range of current

(output rate)

Instrument range

Accuracy of output value

±1.5% rdg. ±1.3 mV ±1.5% rdg. ±1.3 mV (±2.0°) ±1.8% rdg. ±1.3 mV

100.0 A

≤
I
≤

30.0A

0.0 A ≤| I | ≤ 100.0 A

0.00 A ≤| I | ≤ 60.00 A 3.00A ≤ I ≤ 60.00 A ±1.5% rdg. ±5.8 mV ±1.5% rdg. ±5.8 mV (±2.0°) ±1.8% rdg. ±5.8 mV

60.00 A

100.0 A

(1 mV/A)

(10 mV/A)

Accuracy guaranteed range of current

WAVE output (phase) RMS output

measurement

WAVE RMS DC 45 Hz ≤ f ≤ 66 Hz DC 45 Hz ≤ f ≤ 66 Hz

0.00 A ≤| I | ≤ 60.00 A 3.00 A ≤ I ≤ 60.00 A ±2.5% rdg. ±6.2 mV

60.00 A

Instrument

range(output rate)

±2.5% rdg. ±1.7 mV

100.0 A

≤
I
≤

30.0 A

0.0 A ≤| I | ≤ 100.0 A

100.0 A

(1 mV/A)

(10 mV/A)

Combinational Accuracies (Representative values)

HIOKI CM7290A961-03

±2.8% rdg. ±3.8 mV

±2.8% rdg. ±30.8 mV

(±2.0°)

(±2.0°)

±2.5% rdg. ±3.8 mV

±2.5% rdg. ±30.8 mV

AC + DC function

±3.7% rdg. ±4.2 mV ±2.8% rdg. ±4.2 mV

±3.7% rdg. ±31.2 mV ±2.8% rdg. ±31.2 mV

(±2.0°)

(±2.0°)

±2.5% rdg. ±4.2 mV

±2.5% rdg. ±31.2 mV

DC function AC function AC + DC function

Accuracy guaranteed range of current

CM7290 (CM7291) + CT7636/CT7736

Accuracy of displayed value

measurement

DC AC/AC+DC DC 45 Hz ≤ f ≤ 66 Hz DC 45 Hz ≤ f ≤ 66 Hz

600.0 A 0.0 A ≤| I | ≤ 600.0 A 30.0 A ≤ I ≤ 600.0 A ±2.3% rdg. ±3.8 A ±2.3% rdg. ±3.8 A ±3.5% rdg. ±4.5 A ±2.3% rdg. ±4.2 A

60.00 A 0.00 A ≤| I | ≤ 60.00 A 3.00 A ≤ I ≤ 60.00 A ±2.3% rdg. ±3.08 A ±2.3% rdg. ±3.08 A ±3.5% rdg. ±3.15 A ±2.3% rdg. ±3.12 A

Instrument range

DC function AC function

WAVE output WAVE output (phase) RMS output

measurement

WAVE RMS DC 45 Hz ≤ f ≤ 66 Hz

Accuracy guaranteed range of current

(output rate)

Instrument range

Accuracy of output value

0.0 A ≤| I | ≤ 600.0 A 30.0 A ≤ I ≤ 600.0 A ±2.5% rdg. ±3.8 mV

0.00 A ≤| I | ≤ 60.00 A 3.00 A ≤ I ≤ 60.00 A ±2.5% rdg. ±30.8 mV

600.0 A

60.00 A
(10 mV/A)

(1 mV/A)

WAVE output (phase) RMS output

measurement

WAVE RMS DC 45 Hz ≤ f ≤ 66 Hz DC 45 Hz ≤ f ≤ 66 Hz

Accuracy guaranteed range of current

(output rate)

Instrument range

0.0 A ≤| I | ≤ 600.0 A 30.0 A ≤ I ≤ 600.0 A ±3.5% rdg. ±4.2 mV

0.00 A ≤| I | ≤ 60.00 A 3.00 A ≤ I ≤ 60.00 A ±3.5% rdg. ±31.2 mV

60.00 A

600.0 A

(1 mV/A)

(10 mV/A)

Appx.

67

Combinational Accuracies (Representative values)

HIOKI CM7290A961-03

±1.8% rdg. ±22 A

±1.8% rdg. ±18 A

DC function AC function AC + DC function

±2.3% rdg. ±2.2 mV

±3.0% rdg. ±25 A

AC + DC function

±2.0% rdg. ±1.8 mV (±2.5°) ±2.3% rdg. ±1.8 mV

WAVE output (phase) RMS output

DC function AC function

±1.8% rdg. ±18 A

WAVE output WAVE output (phase) RMS output

±2.0% rdg. ±1.8 mV

±3.2% rdg. ±2.2 mV

±2.0% rdg. ±2.2 mV (±2.5°)

±3.0% rdg. ±2.2 mV

Accuracy guaranteed range of current

CM7290 (CM7291) + CT7642/CT7742

Accuracy of displayed value

68

300 A ≤ I ≤ 1800 A

measurement

DC AC/AC+DC DC 45Hz ≤ f ≤ 66Hz DC 45Hz ≤ f ≤ 66 Hz

2000 A 0 A ≤ | I | ≤ 2000 A

600.0 A 0.0 A ≤ | I | ≤ 600.0 A 30.0 A ≤ I ≤ 600.0 A ±1.8% rdg. ±10.8 A ±1.8% rdg. ±10.8 A ±3.0% rdg. ±11.5 A ±1.8% rdg. ±11.2 A

Instrument range

1800 A < I ≤ 2000 A ±2.3% rdg. ±18 A ±2.3% rdg. ±22 A

measurement

WAVE RMS DC 45 Hz ≤ f ≤ 66 Hz

Accuracy guaranteed range of current

600.0 A

(output rate)

Instrument range

Accuracy of output value

0 A ≤ I ≤ 1800 A 300 A ≤ I ≤ 1800 A

0.00 A ≤ I ≤ 600.0 A 30.0 A ≤ I ≤ 600.0 A ±2.0% rdg. ±10.8 mV ±2.0% rdg. ±10.8 mV (±2.5°) ±2.3% rdg. ±10.8 mV

1800 A < I ≤ 2000 A 1800 A < I ≤ 2000 A ±2.5% rdg. ±1.8 mV (±2.5°) ±2.8% rdg. ±1.8 mV

2000 A

(1 mV/A)

(0.1 mV/A)

measurement

WAVE RMS DC 45 Hz ≤ f ≤ 66 Hz DC 45 Hz ≤ f ≤ 66 Hz

Accuracy guaranteed range of current

(output rate)

Instrument range

0.00 A ≤ I ≤ 600.0 A 30.0 A ≤ I ≤ 600.0 A ±3.0% rdg. ±11.2 mV ±2.0% rdg. ±11.2 mV (±2.5°) ±3.2% rdg. ±11.2 mV ±2.3% rdg. ±11.2 mV

600.0 A

(1 mV/A)

0 A ≤ I ≤ 1800A 300 A ≤ I ≤ 1800 A

1800 A < I ≤ 2000 A 1800 A < I ≤ 2000 A ±2.5% rdg. ±2.2 mV (±2.5°) ±2.8% rdg. ±2.2 mV

2000 A

(0.1 mV/A)

AC function

HIOKI CM7290A961-03

Combinational Accuracies (Representative values)

AC function

Accuracy guaranteed range

CM7290 (CM7291) + CT7044/CT7045/CT7046

Instrument range

Accuracy of displayed value

45 Hz ≤ f ≤ 66 Hz

of current measurement

6000 A 300 A ≤ I ≤ 6000 A ±1.8% rdg. ±23 A

60.00 A 3.00 A ≤ I ≤ 60.00 A ±1.8% rdg. ±1.58 A

600.0 A 30.0 A ≤ I ≤ 600.0 A ±1.8% rdg. ±2.3 A

WAVE output (phase) RMS output

measurement

WAVE RMS 45 Hz ≤ f ≤ 66 Hz

Accuracy guaranteed range of current

Instrument range

Accuracy of output value

0.00 A ≤ I ≤ 60.00 A 0.00 A ≤ I ≤ 60.00 A ±2.0% rdg. ±15.8 mV (±1.2°) ±2.3% rdg. ±15.8 mV

60.00 A
(10 mV/A)

(output rate)

0 A ≤ I ≤ 6000 A 0 A < I ≤ 6000 A ±2.0% rdg. ±2.3 mV (±1.2°) ±2.3% rdg. ±2.3 mV

0.0 A ≤ I ≤ 600.0 A 0.0 A ≤ I ≤ 600.0 A ±2.0% rdg. ±2.3 mV (±1.2°) ±2.3% rdg. ±2.3 mV

6000 A

600.0 A

(1 mV/A)

(0.1 mV/A)

Appx.

69

Combinational Accuracies (Representative values)

HIOKI CM7290A961-03

AC function

WAVE output (phase) RMS output

AC function

Accuracy guaranteed range

CM7290 (CM7291) + CT7126

Instrument range

Accuracy of displayed value

70

45 Hz ≤ f ≤ 66 Hz

of current measurement

6.000 A 0.300 A ≤ I ≤ 6.000 A ±0.6%r dg. ±0.014 A

60.00 A 3.00 A ≤ I ≤ 60.00 A ±0.6% rdg. ±0.09 A

600.0 mA 40.0 mA ≤ I ≤ 600.0 mA ±1.6% rdg. ±7.3 mA

WAVE RMS 45 Hz ≤ f ≤ 66 Hz

0.00 A ≤ I ≤ 60.00 A 3.00 A ≤ I ≤ 60.00 A ±0.8% rdg. ±0.86 mV (±2.2°) ±1.1% rdg. ±0.86 mV

0.000 A ≤ I ≤ 6.000 A 0.300 A ≤ I ≤ 6.000 A ±0.8% rdg. ±1.4 mV (±2.2°) ±1.1% rdg. ±1.4 mV

Accuracy guaranteed range of current measurement

Instrument range

Accuracy of output value

40.0 mA ≤ I ≤ 600.0 mA 40.0 mA ≤ I ≤ 600.0 mA ±1.8%r dg. ±7.3 mV (±2.2°) ±1.8% rdg. ±7.3 mV

600.0 mA

(output rate)

6.000 A

(1 mV/mA)

60.00 A

(100 mV/A)

(10 mV/A)

AC function

HIOKI CM7290A961-03

WAVE output (phase) RMS output

Combinational Accuracies (Representative values)

AC function

Accuracy guaranteed range

CM7290 (CM7291) + CT7131

Instrument range

Accuracy of displayed value

45 Hz ≤ f ≤ 66 Hz

of current measurement

60.00 A 3.00 A ≤ I ≤ 60.00 A ±0.6% rdg. ±0.10 A

100.0 A 30.0 A < I ≤ 100.0 A ±0.6% rdg. ±0.8 A

Accuracy of output value

A 30.0 A ≤ I ≤ 100.0 A ±0.8% rdg. ±0.82 mV (±1.2°) ±1.1% rdg. ±0.82 mV

WAVE RMS 45 Hz ≤ f ≤ 66 Hz

Accuracy guaranteed range of current measurement

(output rate)

100.0A (1 mV/A) 0.0 A ≤ I ≤ 100.0

60.00 A (10 mV/A) 0.00 A ≤ I ≤ 60.00 A 3.00 A ≤ I ≤ 60.00 A ±0.8% rdg. ±1.0 mV (±1.2°) ±1.1% rdg. ±1.0 mV

Instrument range

Appx.

71

Combinational Accuracies (Representative values)

HIOKI CM7290A961-03

AC function

WAVE output (phase) RMS output

AC function

Accuracy guaranteed range

Instrument range

CM7290 (CM7291) + CT7136

Accuracy of displayed value

72

45 Hz ≤ f ≤ 66 Hz

of current measurement

600.0 A 30.0 A ≤ I ≤ 600.0 A ±0.6% rdg. ±0.86 A

6.000 A 0.400 A ≤ I ≤ 6.000 A ±1.6% rdg. ±0.073 A

60.00 A 3.00 A ≤ I ≤ 60.00 A ±0.6% rdg. ±0.14 A

WAVE RMS 45 Hz ≤ f ≤ 66 Hz

Accuracy guaranteed range of current measurement

(output rate)

Instrument range

600.0 A (1 mV/A) 0.0 A ≤ I ≤ 600.0 A 30.0 A ≤ I ≤ 600.0 A ±0.8% rdg. ±0.86 mV (±0.7°) ±1.1% rdg. ±0.86 mV

60.00 A (10 mV/A) 0.00 A ≤ I ≤ 60.00 A 3.00 A ≤ I ≤ 60.00 A ±0.8% rdg. ±1.4 mV (±0.7°) ±1.1% rdg. ±1.4 mV

6.000 A (100 mV/A) 0.400 A ≤ I ≤ 6.000 A 0.400 A ≤ I ≤ 6.000 A ±1.8% rdg. ±7.3 mV (±0.7°) ±1.8% rdg. ±7.3 mV

Accuracy of output value

AC function

HIOKI CM7290A961-03

WAVE output (phase) RMS output

Combinational Accuracies (Representative values)

AC function

Accuracy guaranteed range

Instrument range

CM7290 (CM7291) + CT7116

Accuracy of displayed value

45 Hz ≤ f ≤ 66 Hz

of current measurement

6.000 A 0.300 A ≤ I ≤ 6.000 A ±1.3% rdg. ±0.011 A

60.00 mA 4.00 mA ≤ I ≤ 60.00 mA ±2.3% rdg. ±3.13 mA

600.0 mA 30.0 mA ≤ I ≤ 600.0 mA ±1.3% rdg. ±3.8 mA

WAVE RMS 45Hz ≤ f ≤ 66Hz

Accuracy guaranteed range of current measurement

(output rate)

Instrument range

Accuracy of output value

6.000A (100 mV/A) 0.000 A ≤ I ≤ 6.000 A 0.300 A ≤ I ≤ 6.000 A ±1.5% rdg. ±1.1 mV (±3.2°) ±1.8% rdg. ±1.1 mV

600.0mA (1mV/mA) 0.0 mA ≤ I ≤ 600.0 mA 30.0 mA ≤ I ≤ 600.0 mA ±1.5% rdg. ±3.8mV (±3.2°) ±1.8% rdg. ±3.8 mV

60.00 mA (10 mV/mA) 4.00 mA ≤ I ≤ 60.00 mA 4.00 mA ≤ I ≤ 60.00 mA ±2.5% rdg. ±31.3 mV (±3.2°) ±2.5% rdg. ±31.3 mV

Appx.

73

Measurement Response Waveforms

HIOKI CM7290A961-03

Appx. 4 Measurement Response

Waveforms

When generating RMS or PEAK output, select an appropriate measurement
response time based on the following waveform response information:

RMS output (input: 3 Hz)

RMS Output (3 Hz Input)

Time (sec)

RMS output (input: 10 Hz)

RMS Output (10 Hz Input)

Time (sec)

RMS output (input: 45 Hz)

RMS Output (45 Hz Input)

RMS Output (3 Hz Input)

Time (sec)

RMS Output (10 Hz Input)

Time (sec)

RMS Output (45 Hz Input)

74

Time (sec)

Time (sec)

PEAK output (input: 10 Hz)

HIOKI CM7290A961-03

PEAK Output (10 Hz Input)

PEAK output (input: 50 Hz)

PEAK Output (50 Hz Input)

Measurement Response Waveforms

Time (sec)

Time (sec)

Appx.

75

Measurement Response Waveforms

HIOKI CM7290A961-03

76

HIOKI CM7290A961-03

HIOKI CM7290A961-03

HIOKI CM7290A961-03

www.hioki.com/

HIOKI CM7290A961-03