Hioki CM7290 User manual

CM7290
CM7291 Instruction Manual
DISPLAY UNIT
EN
Oct. 2018 Revised edition 2
CM7290A961-02 18-10H

i
Contents
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
Installing/replacing the batteries...............................................27
Connecting the AC adapter (optional)......................................28
Connecting to an external DC power supply............................ 29
2.4 Turning the Power On/Off ............................................30
When using battery power .......................................................30
When using the AC adapter or an external DC power supply:. 30
2.5 Connecting to an External Device...............................31
3 Measurement and Output 33
3.1 Inspection Prior to Use.................................................33
3.2 Taking Measurements ..................................................34
CM7290A961-02
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3
2
1
Appx.

ii
Contents
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® Communications (only for CM7291).........39
Installing the application software GENNECT Cross ...............39
Pairing the app with the CM7291.............................................40
Making measurements with the Bluetooth
®
function ................40
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 Appx.1
Appx.1 RangeStructure,Outputrate,andPower
Consumption Category with a Sensor
Connected ......................................................Appx.1
Appx. 2 Calculating Accuracy When Used with a
Sensor ............................................................Appx.2
Appx. 3 Combined Accuracies (Representative
values) ............................................................Appx.3
Appx. 4 Measurement Response Waveforms ......... Appx.11

1
Introduction
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.
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)
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Appx. Ind.

2
Verifying Package Contents
Options
• The following options are available for this unit. Contact your authorized Hioki
distributor or reseller when ordering.
•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

3
Measurement Flowchart
Measurement Flowchart
When performing standalone measurement
Installation and connection
Inspect prior to use (p. 33).
Connect the sensor to the unit (p. 26). You will need:
A sensor equipped with a Hioki PL14
connector (optional)
Connect the unit to the power supply (p. 27).
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).
「 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 NO
NO
OK NO NO 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
↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
OK
NO NONO
OK NO NO NO
Zero
adjustment
Measure-
ment modes
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.
Ending
Disconnect the sensor from the
conductor measured, and turn off the
unit’s power supply.
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Appx. Ind.

4
Measurement Flowchart
When measuring while connected to another device
Installation and connection
Inspect prior to use (p. 33).
Connect the sensor to the unit (p. 26). You will need:
A sensor equipped with a Hioki PL14
connector (optional)
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:
•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) Required settings:
1. Measurement modes (p. 16)
1. Output mode (p. 17)
2. Range ((p. 16), p. 35p, p. Appx.1)
Observe and record waveforms with the
external device.
Ending
Turn the power off to complete measurement.

5
Measurement Flowchart
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).
Display unit
2
1
- 4
1
- 3
Conductor to
be measured
1
-
1
Sensor
Connectable connector
JEITA RC5320A
Classication 3
(EIAJ RC5320A TYPE 3)
(Grip portion external
diameter not more than
φ10 mm)
Measurement
circuitry
Measuring system
Power
supply
Output
1
- 2
1
Connections
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
2
Setting
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 keylock 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.
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Appx. Ind.

6
Safety Information
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
Indicates an imminent hazard that could lead to serious injury or death.
WARNING
Indicates a hazard that could lead to serious injury or death.
CAUTION
Indicates a hazard that could lead to minor injury or that could be expected
to result in equipment or other damage.
IMPORTANT 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.
Bold character Control operation keys are enclosed in blackets ([ ]).

7
Safety Information
Symbols displayed on the unit
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.
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
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8
Operating Precautions
Accuracy
We dene measurement tolerances in terms of f.s. (full scale), rdg. (reading) and dgt.
(digit) values, with the following meanings:
f.s.
(Maximum display value)
Indicates the display unit’s maximum display value for the range that is currently
in use.
rdg. (Reading or displayed value)
The value currently being measured and indicated on the measuring instrument.
dgt.
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.
CAUTION
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.

9
Operating Precautions
Usage environment
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).
•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
WARNING
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.
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Appx. Ind.

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Operating Precautions
Handling of the cables
WARNING
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
CAUTION
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.
IMPORTANT
•Handle and dispose of batteries in accordance with local regulations.
•The indicator lights up when the batteries have run low. Replace them as
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.

11
1Overview
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
•Bluetooth® is a registered trademark of Bluetooth SIG, Inc.(USA).
The trademark is used by HIOKI E.E. CORPORATION under license.
•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 miniTM, iPad ProTM, and iPod touch are trademarks of Apple Inc.
•The App Store is a service mark of Apple Inc.
1 Overview
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12
Parts and Functions
1.2 Parts and Functions
CM7291 (Display unit with protector)
Rear
Serial No. label*2
Front
Battery cover
(p. 27)
Display section
(p. 13)
Control keys
(p. 15)
Sensor input
connector
(p. 43)
Protector*1
Output jack (p. 31)
Dust cap*1 (p. 31)
AC adapter jack (external power supply jack) (p. 28)
Bottom
“AC adapter” (p. 9)
*1:
*2:
If the protector or dust cap gets dirty or damaged, replace it as necessary.
Contact your authorized Hioki distributor or reseller when ordering.
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.

13
Parts and Functions
Display
1
3
5
6
9
2
4
7
8
10 11
12
13
14
15
16
17181920
1Output ×10 function enabled (p. 17)
2Output mode enabled (p. 17)
3Response speed (p. 17)
4Hold function enabled (p. 16)
5Filter function is enabled (p. 22)
6Measurement modes (p. 16)
7Over-range (p. 14)
8Over-output (p. 14)
9Auto ranging /
Manual ranging (p. 16)
10 Zero adjustment at power-up
enabled (p. 20)
11 Save settings enabled (p. 20)
12 Unit
13 Measured value (main display)
14 Items displayed when analysis
display is enabled (p. 16)
15 (Subdisplay:)
Instantaneous value when
analysis display is enabled (p. 16)
Output rate when output mode
is enabled (p. 17)
16 Bluetooth®Communications (p. 18)
17 Keylock function enabled (p. 18)
18 Auto power-save function
enabled (p. 20)
19 Battery power warning display (p. 14)
20 AC adapter connected (p. 28)
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14
Parts and Functions
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).

15
Tables of Key Operations
1.3 Tables of Key Operations
This section describes how to access different functions by pressing keys differently.
Short press 1-second long press Turn on power
while pressing key*
Execute the operation
written on the key
Execute the operation
written above the key
Execute a specic
command (see the
following pages)
Example:
Switches the range Filter function
enabled/disabled
Displays the model
number and software
version
* : 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
Batteries 
First turn off the power and then press
the [ON/OFF] key while pressing the
key
AC adapter
or
external DC
power supply

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 
• "Measuring" (p. 16)
•"Display/output/communication"
(p. 17)
• "System operation" (p. 18)
• "Maintenance operation" (p. 19)
• "Handy functions" (p. 20)
Roles of individual keys • "Key congurations" (p. 22)
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16
Tables of Key Operations
Measuring
Desired operation
(function)
How to set/
cancel it
Screen display
Enabled: Lit
Disabled: Unlit
Description
Turn the power on
(with battery drive) Short press
Display lights up
•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.
Turn the power off
(with battery drive) 1-second
long press
Display
goes out
Execute zero
adjustment 1-second
long press
Example: •Resets the display value to
zero, after memorizing it.
•Disabled if an AC current
sensor is connected.
Switch the
measurement mode
Short press
: DC measurement ("DC")
: AC measurement ("AC")
: AC + DC measurement ("AC+DC")
: Frequency measurement ("Hz")
Hold display
updating (HOLD) Short press
•Halts updating of the display.
•Can be used for any
measurement.
Switch ranging
manually (Ranging) Short press
RANGE: AUTO:
Auto ranging
RANGE: MANUAL:
Manual ranging
•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.