Hioki CM4373-50 User manual

CM4371-50
CM4373-50 Instruction Manual
AC/DC CLAMP METER
EN
Dec. 2021 Edition 1
CM4371C961-00 21-12H
Read carefully before use.
Keep for future reference.
CM4375-50
CM4371-50
CM4373-50 Instruction Manual
AC/DC CLAMP METER
EN
Dec. 2021 Edition 1
CM4371C961-00 21-12H
Read carefully before use.
Keep for future reference.
CM4375-50
www.hioki.com/
www.hioki.com/
HIOKI CM4371C961-00
Test Equipment Depot - 800.517.8431 - 5 Commonwealth Ave, MA 01801
TestEquipmentDepot.com

HIOKI CM4371C961-00

i
CM4371C961-00
Contents
Introduction.................................................................................................................1
Notations.....................................................................................................................2
Checking Package Contents .....................................................................................7
Options........................................................................................................................8
Safety Information....................................................................................................11
Operating Precautions.............................................................................................12
1 Overview 17
1.1 Product Overview and Features ..........................................................17
1.2 Part Names ............................................................................................18
2 Making Measurements 19
2.1 Inspection Before Measurement..........................................................19
2.2 Installing Batteries and the Z3210 Wireless Adapter.........................20
Installation procedure ............................................................................................23
2.3 Use of Test Leads..................................................................................25
L9300 Test Lead (accessory).................................................................................27
HIOKI CM4371C961-00

ii
Contents
2.4 Current Measurement ...........................................................................30
Manual hold, automatic hold..................................................................................32
Switching the ranges .............................................................................................36
Filter function .........................................................................................................37
Maximum value, minimum value, average, and peak value ..................................38
Inrush current (inrush) ...........................................................................................39
2.5 Various Other Measurement Functions ..............................................40
2.6 LCD Backlight, Automatic Power Save (APS) ....................................44
2.7 DC High V Probe Mode .........................................................................45
2.8 Wireless communications function.....................................................49
Using GENNECT Cross.........................................................................................49
Z3210-to-Excel®direct data entry function
(Excel®direct input function, HID function) ............................................................53
2.9 Rotary Switch Combinations ...............................................................57
3 Specications 59
3.1 GeneralSpecications .........................................................................59
3.2 InputSpecications,MeasurementSpecications ...........................63
3.3 Accuracy table.......................................................................................74
HIOKI CM4371C961-00

iii
Contents
4 Maintenance and Service 107
4.1 Troubleshooting ..................................................................................107
4.2 Error and Operation Displays ............................................................109
4.3 Cleaning ...............................................................................................110
Index 111
WarrantyCerticate 115
HIOKI CM4371C961-00

iv
Contents
HIOKI CM4371C961-00

1
Introduction
Introduction
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.
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).
HIOKI CM4371C961-00
Test Equipment Depot - 800.517.8431 - 5 Commonwealth Ave, MA 01801
TestEquipmentDepot.com

2
Notations
Trademarks
• Microsoft Excel is a registered trademark or a trademark of Microsoft Corporation in the
United States and other countries.
• 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.
Notations
Safety notations
In this document, the severity levels of risk and hazard are classied as follows.
DANGER
Indicates an imminently
hazardous situation that, if not
avoided, will result in death or
serious injury.
Indicates an action that must not
be performed.
WARNING
Indicates a potentially hazardous
situation that, if not avoided, could
result in death or serious injury.
Indicates an action that must be
performed.
HIOKI CM4371C961-00

3
Notations
CAUTION
Indicates a potentially hazardous
situation that, if not avoided, could
result in minor or moderate injury.
Indicates a high-voltage hazard.
Failure to verify safety or improper
handling of the instrument could
lead to electric shock, burn injury,
or death.
NOTICE
Indicates potential risks of damage
to the supported product (or to
other property).
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.
IMPORTANT
Indicates information or content
that is particularly important from
the stand point of operating or
maintaining the instrument.
HIOKI CM4371C961-00

4
Notations
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.
HIOKI CM4371C961-00

5
Notations
Symbols for various standards
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.
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 Exception
: Wire break detected
HIOKI CM4371C961-00

6
Notations
Accuracy labeling
Instrument accuracy is expressed by dening 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)
Indicates the value displayed by the instrument.
Limit values for reading errors are expressed as a percentage of the reading (“% rdg”).
Full scale
(maximum
display value)
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.”).
Other notations
(p. ) Indicates the page number to reference.
*Indicates additional information is described below.
CM4371-50 Indicates that the item is applicable to the CM4371-50 only.
HIOKI CM4371C961-00

7
Checking Package Contents
Checking Package Contents
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 specications,
please contact your authorized Hioki distributor or reseller.
AC/DC Clamp Meter
CM4371-50
CM4373-50 CM4375-50
L9300 Test Lead
(p. 25)
C0203 Carrying Case
LR03 Alkaline batteries ×2
Instruction Manual
(this manual)
Operating Precautions
(0990A907)
HIOKI CM4371C961-00

8
Options
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
L4933 Contact Pin Set*3
L4934 Small Alligator Clip Set*4
L9207-10 Test Lead*1
L9300 Test Lead*1
When attaching the L4933 or L4934 to test leads, set the test leads
to the measurement category II conguration (for the L9207-10,
remove the sleeves).
HIOKI CM4371C961-00

9
Options
L4935 Alligator Clip Set*2
L9243 Grabber Clip*5
L4936 Bus Bar Clip Set*6
L4937 Magnetic Adapter Set*7
L4932 Test Pin Set*1
L4930 Connection Cable Set*2
(length: 1.2 m)
L4938 Test Pin Set*8
L4939 Breaker Pin Set*9
L4931 Extension Cable Set*2
(length: 1.5 m,
with the coupling connector)
9804 Magnetic Adapter*10
DT4910 Thermocouples (K)
P2000 DC High Voltage Probe*11
*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
HIOKI CM4371C961-00

10
Options
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. 49).
HIOKI CM4371C961-00

11
Safety Information
Safety Information
Measurement categories
The instrument conforms to the safety requirements for CAT III 1000 V and CAT IV 600 V
measuring instruments.
T
Outlet
Internal wiring
Distribution
panel
Service entrance
Service drop
CAT IV
(≤600 V)
Power meter
CAT III
(≤1000 V)
Fixed installation
CAT II
(≤1000 V)
HIOKI CM4371C961-00

12
Operating Precautions
Operating Precautions
Observe the following precautionary information to ensure that the instrument can be used
safely and in a manner that allows it to perform as described in its specications. Carefully
read the separate document entitled “Operating Precautions” before use. Use of the instrument
should conform not only to its specications, but also to the specications of all accessories,
options, and other equipment in use.
DANGER
Do not touch the section beyond the barrier during operation.
Failure to do so could cause the operator to experience an electric shock.
See “1.2 Part Names” (p. 18).
Do not measure any current in excess of the derating curve.
Doing so can cause overheating of the sensor, resulting in bodily injury, re, or
damage to the instrument.
See "Frequency derating characteristics" (p. 66).
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.
HIOKI CM4371C961-00

13
Operating Precautions
DANGER
Conrm that the white portion (insulation layer) inside the
cable is not exposed.
Using the instrument with a color inside its cable exposed could cause the
operator to experience an electric shock.
WARNING
Do not allow the instrument to get wet.
Do not take measurements with wet hands.
Failure to do so could cause the operator to experience an electric shock.
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.
Using the instrument to make measurements that exceed either rating could
cause the operator to experience an electric shock.
HIOKI CM4371C961-00

14
Operating Precautions
IMPORTANT
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 a󰀨ect 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.
HIOKI CM4371C961-00