Hioki CM4371-50, CM4373-50, CM4375-50 Instruction Manual
CM4371-50
HIOKI CM4371C961-01
CM4373-50
CM4375-50
AC/DC CLAMP METER
Read carefully before use.
Keep for future reference.
Instruction Manual
EN
Mar. 2023 Revised edition 1
CM4371C961-01
[600625631]
Contents
HIOKI CM4371C961-01
Introduction .................................................................................................................1
Notations .....................................................................................................................3
Checking Package Contents .....................................................................................7
Options ........................................................................................................................8
Safety Information ....................................................................................................11
Operating Precautions .............................................................................................12
1 Overview 19
1.1 Product Overview and Features ..........................................................19
1.2 Part Names ............................................................................................20
2 Making Measurements 21
2.1 Inspection Before Measurement ..........................................................21
2.2 Installing Batteries and the Z3210 Wireless Adapter .........................22
Installation procedure ............................................................................................25
2.3 Use of Test Leads ..................................................................................27
L9300 Test Lead (accessory) .................................................................................29
CM4371C961-01
i
Contents
HIOKI CM4371C961-01
2.4 Current Measurement ...........................................................................32
2.5 Various Other Measurement Functions ..............................................42
2.6 LCD Backlight, Automatic Power Save (APS) ....................................46
2.7 DC High V Probe Mode .........................................................................47
2.8 Wireless communications function .....................................................51
2.9 Rotary Switch Combinations ...............................................................59
3 Specications 61
3.1 GeneralSpecications .........................................................................61
3.2 InputSpecications,MeasurementSpecications ...........................65
3.3 Accuracy table .......................................................................................75
ii
Manual hold, automatic hold ..................................................................................34
Switching the ranges .............................................................................................38
Filter function .........................................................................................................39
Maximum value, minimum value, average, and peak value ..................................40
Inrush current (inrush) ...........................................................................................41
Using GENNECT Cross .........................................................................................51
Z3210-to-Excel® direct data entry function
(Excel® direct input function, HID function) ............................................................55
4 Maintenance and Service 107
HIOKI CM4371C961-01
4.1 Troubleshooting ..................................................................................107
4.2 Error and Operation Displays ............................................................109
4.3 Cleaning ...............................................................................................110
5 Appendix 111
5.1 Voltage Detection Function ................................................................ 111
5.2 Example of Use ...................................................................................113
Index 115
WarrantyCerticate 119
Contents
iii
Contents
HIOKI CM4371C961-01
iv
Introduction
HIOKI CM4371C961-01
Thank you for choosing the Hioki CM4371-50/CM4373-50/CM4375-50 AC/DC Clamp Meter.
To ensure your ability to get the most out of this instrument over the long term, please read this
manual carefully and keep it available for future reference.
Read the separate document “Operating Precautions” carefully before using the instrument.
Latest edition of instruction manual
The contents of this manual are subject to change, for example as a result of
product improvements or changes to specications.
The latest edition as well as multilingual editions of the manual (in Chinese,
French, German, Italian Korean, and Spanish) can be downloaded from
Hioki’s website.
https://www.hioki.com/global/support/download
Product registration
Register your product in order to receive important product information.
https://www.hioki.com/global/support/myhioki/registration
Introduction
1
Introduction
HIOKI CM4371C961-01
Target audience
This manual has been written for use by individuals who use the product in question or who
teach others to do so. It is assumed that the reader possesses basic electrical knowledge
(equivalent to that of someone who graduated from the electrical program at a technical high
school).
Trademarks
• Microsoft Excel is a registered trademark or a trademark of Microsoft Corporation in the
United States and other countries.
• The Bluetooth
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.
2
®
word mark and logos are registered trademarks owned by Bluetooth SIG, Inc.
Notations
HIOKI CM4371C961-01
Safety notations
In this document, the severity levels of risk and hazard are classied as follows.
DANGER
WARNING
CAUTION
IMPORTANT
Indicates an imminently
hazardous situation that, if not
avoided, will result in death or
serious injury.
Indicates a potentially hazardous
situation that, if not avoided, could
result in death or serious injury.
Indicates a potentially hazardous
situation that, if not avoided, could
result in minor or moderate injury
or potential risks of damage to
the supported product (or to other
property).
Indicates information or content
that is particularly important from
the stand point of operating or
maintaining the instrument.
Notations
Indicates an action that must not
be performed.
Indicates an action that must be
performed.
Indicates a high-voltage hazard.
Failure to verify safety or improper
handling of the instrument could
lead to electric shock, burn injury,
or death.
Indicates the presence of a hazard
caused by a strong magnet. The
product could interfere with the
proper operation of electronic
medical devices such as
pacemakers.
3
Notations
HIOKI CM4371C961-01
Symbols shown on the instrument
Indicates the presence of a potential hazard. For more information about locations where this
symbol appears on instrument components, see the "Operating Precautions" (p. 12) and
the accompanying document entitled “Operating Precautions.”
Indicates that a dangerous voltage is generated from this terminal.
Indicates that the product can be attached or detached while the circuit is live.
Indicates the instrument is protected throughout by double insulation or reinforced insulation.
Indicates alternating current (AC).
Indicates direct current (DC).
Indicates the grounding terminal.
4
Symbols for various standards
HIOKI CM4371C961-01
Indicates that the product is subject to the Waste Electrical and Electronic Equipment (WEEE)
Directive in EU member nations.
Indicates that the product complies with standards imposed by EU directives.
Screen display
The instrument screen displays the alphanumeric characters as follows.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
1 2 3 4 5 6 7 8 9 0
Notations
Exception
: Wire break detected
5
Notations
HIOKI CM4371C961-01
Accuracy labeling
Instrument accuracy is expressed by dening a percentage of the reading, a percentage of full scale, a
percentage of the setting, or a limit value for errors in terms of digits.
Reading
(display value)
Full scale
(maximum
display value)
Other notations
(p. )
*
CM4371
-50
6
Indicates the value displayed by the instrument.
Limit values for reading errors are expressed as a percentage of the reading (“% rdg”).
Indicates the maximum display value for each measurement range. Measurement range
values for the instrument indicates that maximum display value. Limit values for full-scale
errors are expressed as a percentage of full scale (“% f.s.”).
Indicates the page number to reference.
Indicates additional information is described below.
Indicates that the item is applicable to the CM4371-50 only.
Checking Package Contents
HIOKI CM4371C961-01
When you receive the instrument, inspect it to ensure that no damage occurred during
shipment. Pay particular attention to included accessories, panel keys, and terminals. If you nd
any damage or discover that the instrument does not perform as indicated in its specications,
please contact your authorized Hioki distributor or reseller.
AC/DC Clamp Meter
CM4373-50
CM4371-50
CM4375-50
Checking Package Contents
L9300 Test Lead
(p. 27)
C0203 Carrying Case
LR03 Alkaline batteries ×2
Instruction Manual
(this manual)
Please visit Hioki's website to
download other language versions in
PDF format.
Operating Precautions
(0990A907)
7
Options
HIOKI CM4371C961-01
Options
The options listed below are available for the instrument. To order an option, please contact your
authorized Hioki distributor or reseller.
Options are subject to change. Check Hioki’s website for the latest information.
Connection cables
When attaching the L4933 or L4934 to test leads, set the test leads
to the measurement category II conguration (for the L9207-10,
remove the sleeves).
L4933 Contact Pin Set*
3
L9300 Test Lead*
1
L9207-10 Test Lead*
8
1
L4934 Small Alligator Clip Set*
4
Options
HIOKI CM4371C961-01
L4930 Connection Cable Set*2
(length: 1.2 m)
L4931 Extension Cable Set*2
(length: 1.5 m,
with the coupling connector)
DT4910 Thermocouples (K)
P2000 DC High Voltage Probe*
*1: CAT IV 600 V, CAT III 1000 V, CAT II 1000 V, 10 A *7: CAT III 1000 V, 2 A
*2: CAT IV 600 V, CAT III 1000 V, 10 A *8: CAT III 600 V, CAT II 600 V, 10 A
*3: 30 V AC, 60 V DC, 3 A *9: CAT III 600 V, 10 A
*4: CAT III 300 V, CAT II 600 V, 3 A *10: CAT IV 1000 V, 2 A
*5: CAT II 1000 V, 1 A *11: CAT IV 1000 V, CAT III 2000 V
*6: CAT III 600 V, 5 A
L4935 Alligator Clip Set*
L9243 Grabber Clip*
L4936 Bus Bar Clip Set*
L4937 Magnetic Adapter Set*
9804 Magnetic Adapter*
L4932 Test Pin Set*
L4938 Test Pin Set*
11
L4939 Breaker Pin Set*
2
5
6
7
10
1
8
9
9
Options
HIOKI CM4371C961-01
Carrying cases
The instrument, test leads, and the instruction manuals can be accommodated.
C0203 Carrying Case C0207 Carrying Case
Z3210 Wireless Adapter
Connecting the Z3210 to the instrument enables the wireless
communication function.
See “2.8 Wireless communications function” (p. 51).
10
Safety Information
HIOKI CM4371C961-01
Measurement categories
The instrument conforms to the safety requirements for CAT III 1000 V and CAT IV 600 V
measuring instruments.
Service entrance
Service drop
CAT IV
(≤600 V)
Power meter
Distribution
panel
Internal wiring
CAT III
(≤1000 V)
Fixed installation
Safety Information
CAT II
(≤1000 V)
T
Outlet
11
Operating Precautions
HIOKI CM4371C961-01
Operating Precautions
Observe the following precautionary information to ensure that the instrument can be used
safely and in a manner that allows it to perform as described in its specications. Carefully
read the separate document entitled “Operating Precautions” before use. Use of the instrument
should conform not only to its specications, but also to the specications of all accessories,
options, and other equipment in use.
Do not touch the section beyond the barrier during operation.
Do not measure any current in excess of the derating curve.
12
DANGER
Failure to do so could cause the operator to experience an electric shock.
See “1.2 Part Names” (p. 20).
Doing so can cause overheating of the sensor, resulting in bodily injury, re, or
damage to the instrument.
See "Frequency derating characteristics" (p. 68).
The maximum measurement current varies with the frequency, and the current
that can be measured continuously is limited. Operating the instrument at less
than this limitation is referred to as derating.
Inspect the instrument and verify proper operation before
HIOKI CM4371C961-01
use.
Conrm that the white portion (insulation layer) inside the
cable is not exposed.
Operating Precautions
DANGER
Use of the instrument while malfunctioning could result in serious bodily injury.
If you nd any damage, contact your authorized Hioki distributor or reseller.
See “2.1 Inspection Before Measurement” (p. 21).
Using the instrument with a color inside its cable exposed could cause the
operator to experience an electric shock.
13
Operating Precautions
HIOKI CM4371C961-01
Do not allow the instrument to get wet.
Do not take measurements with wet hands.
When using the instrument while connected to test leads,
do not make measurements that exceed either of the ratings
indicated on the instrument or on the test leads, whichever is
lower.
14
WARNING
Failure to do so could cause the operator to experience an electric shock.
Using the instrument to make measurements that exceed either rating could
cause the operator to experience an electric shock.
IMPORTANT
HIOKI CM4371C961-01
Operating Precautions
Do not allow any foreign object to be caught between the
facing core surfaces of the jaws.
Do not scratch the facing core surfaces of the jaws.
Do not touch the facing core surfaces of the jaws with your
ngers.
Do not insert any foreign object into the gap of the jaws.
Do not drop the instrument.
Do not subject the instrument to any shock.
Doing so may adversely aect the measurement accuracy and open/
close operation.
Clamp the instrument around only one conductor. Clamping the instrument
around two or more of conductors in a bundle prevents the instrument from
measuring any current regardless of whether the measurement target is a
single-phase or three-phase circuit.
15
Operating Precautions
HIOKI CM4371C961-01
L4937 Magnetic Adapter Set / 9804 Magnetic Adapter (optional)
People with electronic medical devices such as pacemakers
should not use the magnetic adapter.
Keep the magnetic adapter away from the body.
16
DANGER
Failure to do so may aect proper operation of the electric medical devices,
presenting a hazard to human life.
Do not drop the magnetic adapter.
HIOKI CM4371C961-01
Do not subject the magnetic adapter to mechanical shock.
Do not use the magnetic adapter in locations where it may be
exposed to rainwater, dust, or condensation.
Do not bring the magnetic adapter near magnetic storage devices,
such as oppy disks, magnetic cards, prepaid cards, or magnetized
tickets.
Do not bring the magnetic adapter near precision electronic
equipment, such as computers, TV screens, or electronic wrist
watches.
Operating Precautions
CAUTION
Doing so could damage the magnetic adapter.
Doing so could decompose or deteriorate the magnetic adapter. In addition,
diminished magnetic adhesion cause the instrument to drop, resulting in
damage to the instrument.
Doing so could damage such devices or data stored in them.
17
Operating Precautions
HIOKI CM4371C961-01
18
1
HIOKI CM4371C961-01
Overview
1.1 Product Overview and Features
This instrument is a clamp meter that can
perform true RMS measurement of current
simply by clamping it around a circuit. In
addition to current, it can measure voltage,
frequency, rush current, resistance, diode,
capacitance, temperature , and AC power.
Installing the Z3210 Wireless Adapter
(optional) to the instrument allows your mobile
device to display waveforms and measure
harmonics.
Measurement function list
DC current and DC voltage, DC
power
Electric charge detection
CM4371
-50
Capacitance, temperature
Continuity check, resistance, diode
Automatic AC/DC, AC voltage, DC
voltage, AC+DC voltage, frequency
Automatic AC/DC, AC current, DC
current, AC+DC current, frequency
CM4373
-50
19
Part Names
HIOKI CM4371C961-01
1.2 Part Names
Front Rear
1
2
(The illustration shows the CM4375-50.)
20
1 Operation grip
2 Fn key (allows you to choose a function)
3
4
5
6
7
8
9
10
11
12
3 Jaws
4 Barrier
5 Serial number (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.)
6 Rotary switch
See “Measurement function list” (p. 19).
7 HOLD key
8 LCD
9 Battery cover
10 Operation keys
11 Measurement terminals
12 Strap hole
2
NO
NONO
HIOKI CM4371C961-01
Making Measurements
2.1 Inspection Before Measurement
Check Inspection details Check Inspection details
The battery cover is closed and its screw
has been securely tightened.
There is no foreign matter on the
measurement terminals (p. 20).
The test leads are not broken (p. 43).
There is no damage to the test lead
insulation, and neither the white sheathing
nor metal conductor inside the wire are
exposed.
The instrument is neither damaged nor
cracked.
No segments are missing.
OK
1 Ω or less
(All segments appear)
21
Installing Batteries and the Z3210 Wireless Adapter
HIOKI CM4371C961-01
2.2 Installing Batteries and the Z3210 Wireless Adapter
Installing the Z3210 to the instrument enables the wireless communications function. (p. 51)
Before removing the battery cover, remove the instrument
from an object under measurement and set the rotary switch
to the OFF position.
22
WARNING
Failure to do so could cause the operator to experience an electric shock. When
the instrument is clamped around the object under measurement, the battery
contact terminals are regarded as high-voltage parts.
After replacing the batteries or installing/removing the Z3210
HIOKI CM4371C961-01
Wireless Adapter, install the battery cover and tighten the
screw, then use the instrument.
Secure the battery cover with the screw attached to the
instrument at the time of shipment.
Installing Batteries and the Z3210 Wireless Adapter
WARNING
Use of the instrument with the battery cover removed could result in bodily
injury.
If you have lost the screw or nd that the screw is damaged, please contact your
authorized Hioki distributor or reseller.
23
Installing Batteries and the Z3210 Wireless Adapter
HIOKI CM4371C961-01
CAUTION
Do not mix batteries of dierent ages or types.
Do not use a battery whose recommended service life has expired.
Do not reverse the battery polarity.
Do not leave the exhausted batteries in the instrument.
Doing so may cause the batteries to leak, damaging the instrument.
Use the specied type of batteries only (LR03 Alkaline batteries).
Remove the batteries when the instrument is not in use for an
extended period of time.
Doing so may cause the batteries to leak, damaging the instrument.
Before handling the Z3210, eliminate static electricity on your body
by touching any metallic part, such as a doorknob.
Failure to do so may cause static electricity to damage the Z3210.
• When the
ones in good time. The instrument may be turned o when the display is backlighted or the
buzzer sounds. After use, be sure to turn o the instrument.
• Dispose of the batteries in accordance with local regulations.
24
mark blinks, the batteries will be exhausted. Replace the batteries with new
Installing Batteries and the Z3210 Wireless Adapter
HIOKI CM4371C961-01
Installation procedure
Read the precautions before performing the procedure. (p. 22)
You will need:
Phillips screwdriver (No. 2)
Measurement value
adjusting screws ×3
Do not turn.
NO
Do not turn any screws except the battery cover screw.
After removing the battery cover, you will nd three screws, which are used to adjust
NO
measured values. Do not turn them because the instrument will not be able to perform
measurement accurately.
3, 4
LR03
Alkaline batteries ×2
2
7
22
77
Z3210
Protective cap
5
6
25
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