Hioki CM4375 User manual

EN
Instruction Manual
Sept. 2018 Edition 1
CM4375A961-00 18-09H
CM4375
CM4376
AC/DC CLAMP METER
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Index
CM4375A961-00
Contents
Introduction.....................................................................................................1
Notation..........................................................................................................2
Verifying Package Contents ...........................................................................4
Options (sold separately)................................................................................5
Usage Notes...................................................................................................6
1 Overview 11
1.1 Product Overview and Features.........................................................11
1.2 Part Names ........................................................................................12
2 Making Measurements 13
2.1 Inspection Before Measurement ........................................................13
2.2 Current Measurement ........................................................................14
Manual Hold/Auto Hold......................................................................15
Filter Function.....................................................................................18
MAX value/MIN value/AVG value/PEAK value...................................19
Rush current (INRUSH)......................................................................20
2.3 Other Measurement Functions...........................................................21
2.4 Bluetooth®Communications (only for CM4376).................................25
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Contents
2.5 Backlight/Auto Power Save (APS).....................................................30
2.6 Power-on Option Table.......................................................................31
3 6SHFL¿FDWLRQV 
 *HQHUDO6SHFL¿FDWLRQV .......................................................................33
 ,QSXWVSHFL¿FDWLRQV0HDVXUHPHQWVSHFL¿FDWLRQV ...............................35
3.3 Accuracy Table...................................................................................42
4 Repairs, Inspections, and Cleaning 57
4.1 Troubleshooting..................................................................................57
4.2 Error display.......................................................................................59
4.3 Insert/Replace Batteries.....................................................................60
4.4 Cleaning.............................................................................................61
Index 63
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Introduction
Thank you for purchasing the Hioki CM4375, CM4376 AC/DC Clamp Meter. To obtain maximum
performance from the instrument over the long term, be sure to read this manual carefully and
keep it handy 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).
Trademark
Bluetooth®is a registered trademark of Bluetooth SIG, Inc.(USA). The trademark is used by
HIOKI E.E. CORPORATION under license.
Android, Google Play, and Google Chrome are trademarks of Google, Inc.
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and certain other countries.
iPhone, iPad, iPad miniTM, iPad Pro, and iPod touch are trademarks of Apple Inc.
The App Store is a service mark of Apple Inc.
Any other products and company names are generally either trade names, registered
trademarks or trademarks of respective companies.
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2
Notation
Notation
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Indicates cautions and hazards. Refer to the "Usage Notes" (p.6) section of the instruction
manual and the included “Operating Precautions” for more information.
Indicates that the instrument may be connected to or disconnected from a live conductor.
Screen display
The instrument screen displays the alphanumeric characters as follows.
1234567890
ABCDEFGH I JKLMNOPQRSTUVWXYZ
A different display is used in the case below.
: Wiring break detected
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Notation
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Accuracy
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following meanings:
f.s. (maximum display value/range)
The maximum displayable value. This is usually the name of the currently selected range.
rdg. (displayed value)
The value currently being measured and displayed on the measuring instrument.
dgt. (resolution)
The smallest displayable unit on a digital measuring instrument, i.e., the input value that causes
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Verifying Package Contents
Verifying Package Contents
Model CM4375 or CM4376
AC/DC Clamp Meter
Model L9207-10 Test Lead
Model C0203 Carrying Case
LR03 Alkaline battery ×2
Instruction Manual*
Operating Precautions (0990A907)
Precautions Concerning Use of
Equipment that Emits Radio Waves (only
for model CM4376)
* Instruction manuals may also be available in other languages.
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Options (sold separately)
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Options (sold separately)
C0203 Carrying Case
L4933 Contact Pin Set *6
L4934 Small Alligator Clip Set *5
L4935 Alligator Clip Set *2
9243 Grabber Clip *3
L4936 Bus Bar Clip Set *4
L4937 Magnetic Adapter Set *3
L4932 Test Pin Set *1
L9207-10 Test Lead *1
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) L4938 Test Pin Set *7
L4939 Breaker Pin Set *4
9804 Magnetic Adapter *8
*1: CAT IV 600 V/ CAT III 1000 V/ CAT II 1000 V *5: CAT III 300 V/ CAT II 600 V
*2: CAT IV 600 V/ CAT III 1000 V *6: 33 V AC/ 70 V DC
*3: CAT III 1000 V *7: CAT III 600 V/ CAT II 600 V
*4: CAT III 600 V *8: CAT IV 1000 V
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6
Usage Notes
Usage Notes
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functions. Read the separate document “Operating Precautions” carefully before using the
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instrument itself, but also of any accessories, options, batteries, and other equipment being
used.
DANGER
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ZKLOHWKHLQVWUXPHQWLVLQXVH
See: "1.2 Part Names" (p.12)
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Usage Notes
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WARNING
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apply to insulated conductors.)
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CAUTION
Do not place any foreign object between the jaws or any insert foreign
object into the gap of the sensor head. Doing so may worsen the
performance of the sensor or the opening-closing operation of the
sensor head.
Avoid dropping or jarring the instrument, which could damage the jaw,
adversely affecting measurement.
Attach the clamp around only one conductor. If you clamp single-
phase (2-wire) or three-phase (3-wire) conductors together, the
instrument will not be able to make a measurement.
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Usage Notes
Test Lead
WARNING
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WHVWOHDGWKDWVDWLV¿HVWKHIROORZLQJFULWHULD
Conforms to safety standards IEC61010 or EN61010
Measurement category III or IV
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category and rated voltage.
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measurement categories.
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CAUTION
The cable is hardened in freezing temperatures. Do not bend or pull it to avoid tearing
its shield or cutting cable.
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Usage Notes
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DANGER
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FRPSURPLVHGSUHVHQWLQJDKD]DUGWRKXPDQOLIH
CAUTION
Do not subject the Magnetic Adapter Set to mechanical shock, for example, due to
dropping it. Shock can cause it to be chipped or cracked.
Do not use the Magnetic Adapter Set in locations where it may be exposed to
rainwater, dust, or condensation. In those conditions, the Magnetic Adapter Set
may be decomposed or deteriorated. The magnet adhesion may be diminished. In
such case, the instrument may not be hung in place and may fall.
Do not bring the Magnetic Adapter Set near magnetic storage device such as
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corrupt and may render them unusable. Furthermore, if the Magnetic Adapter
Set is brought near precision electronic equipment such as PCs, TV screens, or
electronic wrist watches, they may fail.
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Usage Notes
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1Overview
1.1 Product Overview and Features
Measurement function list
DC current/DC voltage, DC power
Capacitance, temperature
Continuity check, resistance, diode
AUTO AC/DC, AC voltage, DC
voltage, AC+DC voltage, frequency
AUTOAC/DC, AC current, DC
current, AC+DC current, frequency
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 provides voltage
measurement, frequency measurement, rush
current measurement, resistance measurement,
diode measurement, capacitance measurement,
temperature measurement, and DC power
measurement.
Model CM4376 also provide Bluetooth®
communications functionality, allowing
measurement data to be monitored and logged
from a mobile device.
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Overview
1.2 Part Names
Front Rear
(CM4376)
7
9
5
1
2
8
12
3
11
4
10
6
1Operation grip
2Jaw open/closed mark
(The jaws are open if the mark is not
showing.)
3SHIFT key
(Selects function indicated in blue lettering.)
4Jaw
5Barrier
6Serial number (The serial number consists of
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the year of manufacture, and the next two
indicate the month of manufacture.)
7Rotary switch
8HOLD key
9LCD
10 Battery cover
11 Operation keys
12 Measurement terminals
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2Making Measurements
2.1 Inspection Before Measurement
Check if there is any damage to the instrument occurred during storage or shipping and
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authorized Hioki distributor or reseller.
Check item
The battery cover is closed and its screw has
been securely tightened.
There is no damage to the test lead
LQVXODWLRQDQGQHLWKHUWKHZKLWHVKHDWKLQJQRU
metal conductor inside the wire are exposed.
There is no foreign matter on the
measurement terminals. (p.12)
The instrument is neither damaged nor cracked.
The test leads are not broken.
OK 1 ȍor less
No indicators are missing.
(All lit up)
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Current Measurement
2.2 Current Measurement
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breaker (AC current measurement)
AUTO
(AUTO AC/DC) (AC+DC A)(DC A)
(AC A)
3
Clamp the instrument around a conductor.Turn the rotary switch.
1
4
2
Press for 1 sec.
XZero adjustment
Frequency detection range of AC current
5.0 A or more
DC current polarity detection function
(p.31)
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EX]]HUZLOOVRXQGDQGWKHdisplay will turn
UHGWKUHVKROGí$ Hz
(Frequency)
Be sure that the currents
direction points the arrow.
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Current Measurement
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Manual Hold/Auto Hold
Manual hold Auto hold
XMeasured value
retains. (Measured value stabilizes.)
Measured value automatically retains.
Clamp the instrument around a
conductor.
Pressing the HOLD key again cancels
the measured value hold function.
Xblinks.
Pressing the HOLD key for 1 sec. cancels the auto
hold function.
Press for 1 sec.
Disconnect
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16
Current Measurement
Auto hold conditions
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current). When the measured value is less than the threshold value described in the table in the next page.
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described in the table in the next page.
Start End Start End Start End
Threshold
e.g.: 12.0 A
Auto hold
e.g.: 99.0 A
Auto hold
e.g.: 100.0 A
Measured
value
Fluctuation range
Time
Fluctuation range
Fluctuation range
Held measured value
Measurement
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