Hioki 3285-20 Instruction Manual

Instruction Manual

3285-20

CLAMP ON AC/DC HiTESTER

December 2014 Revised edition 10 3285B981-10 14-12H

Contents

Introduction i
Verifying Package Contents
Safety Information
Operating Precautions
Preliminary Check

viii

xv

Chapter 1 Overview

1.1 Product Overview 1

1.2 Features

1.3 Names and Functions of Parts

1.4 Flowchart of button Operations

1.4.1 Current Measurements Mode 10

1.4.2 Voltage Measurements Mode

1.4.3 Frequency Measurements Mode

1.4.4 Resistance Measurements Mode

10

11
12
12

1.5 Modes 13

Chapter 2 Measurement 15

2.1 Preparations 15

2.1.1 Installing or Replacing the Battery 15

2.1.2 Attaching the Hand Strap

2.1.3 Turning the Power On and Off

2.1.4 Battery Low Warning (When

2.1.5 Pre-Operation Inspection

mark lights) 17

16
16

18

ii

iii

1

2
3

3285B981-10

2.2 Current Measurement 19

2.2.1 Measuring DC Current (DC A) 19

2.2.2 Measuring AC Current (AC A)

2.2.3 Measuring AC/DC Current (AC+DC A)

2.2.4 Peak Hold Measurement

21
22
24

2.3 Voltage Measurement 26

2.3.1 Measuring DC Voltage (DC V) 26

2.3.2 Measuring AC Voltage (AC V)

2.3.3 Measuring AC/DC Voltage (AC+DC V)

2.3.4 Peak Hold Measurement

27
28
29

2.4 Frequency Measurement 31

2.4.1 Frequency Measurement in Current Mode 31

2.4.2 Frequency Measurement in Voltage Mode

32

2.5 Resistance Measurement 34

2.6 Continuity Check

36

Chapter 3 Useful Functions 39

3.1 Adjusting and Correcting Values 39

3.1.1 Auto-Zero-Adjustment Function 39

3.1.2 Zero-Cancel Correction Function

3.2 Pausing and Reading the Display

(Data Hold Function HOLD)

41

3.3 Alteration of Counter Updates

3.3.1 SLOW mode 42

3.3.2 FAST mode

3.4 Storing Values in Memory
(Recording Function REC)

3.5 Automatically T urning Power Off
(Auto Power-Off Function APS

)

47

3.6 Beep Tone

40

42

42

43

48

Chapter 4 Specifications 49

4.1 Measurement Specifications 49

4.1.1 Current Measurement Specifications 49

4.1.2 Voltage Measurement Specifications

4.1.3 Resistance Measurement Specifications

4.1.4 Continuity Check

52
54
54

4.2 General Specifications 55

Chapter 5 Maintenanceand Service 59

5.1 Cleaning 59

5.2 After service

5.3 Troubleshooting

5.4 Error Massage

59
60
64

Introduction

Thank you for purchasing the HIOKI "3285-20
Clamp-on AC/DC HiTester."
To obtain maximum performance from the
instrument, please read this manual first, and keep it
handy for future reference.

Request

We have tried to bring this manual as close to
perfection as we could achieve. If perchance you
find any unclear portions, mistakes, omissions, or
the like, we would be most obliged if you could
please notify us of them via any HIOKI agent, or
directly.

i___________________________________________________

___________________________________________________

Introduction

ii___________________________________________________

Verifying Package Contents

When you receive the instrument, inspect it
carefully to ensure that no damage occurred during
shipping. In particular, check the accessories, panel
switches, and connectors.

If damage is evident, or if it fails to operate
according to the specifications, contact your dealer
or Hioki representative.

Main unit

3285-20 Clamp-on AC/DC HiTester

Supplied accessories

9345 Carrying Case 1
L9207-10 Test Lead (red and black) 1
Hand Strap 1
Battery 6F22(006P) 1
Instruction manual 1

___________________________________________________

Verifying Package Contents

Safety Information

DANGER

This instrument is designed to comply with IEC

61010 Safety Standards, and has been thoroughly
tested for safety prior to shipment. However,
mishandling during use could result in injury or
death, as well as damage to the instrument. Be
certain that you understand the instructions and
precautions in the manual before use. We disclaim
any responsibility for accidents or injuries not
resulting directly from instrument defects.

This manual contains information and warnings essential
for safe operation of the instrument and for maintaining
it in safe operating condition. Before using it, be sure to
carefully read the following safety precautions.

iii______________________________ _____________________

___________________________________________________

Safety Information

iv___________________________________________________

Safety Symbols

The symbol printed on the instrument
indicates that the user should refer to a
corresponding topic in the manual (marked with
the

symbol) before using the relevant
function.
In the manual, the
particularly important information that the user
should read before using the instrument.

Indicates both DC (Direct Current) and AC
(Alternating Current).

Indicates DC (Direct Current).
Indicates that dangerous voltage may be

present at this terminal

Indicates a double-insulated device.

Indicates a grounding terminal.

Indicates that the instrument may be connected
to or disconnected from a live circuit.

symbol indicates

___________________________________________________

Safety Information

The following symbols in this manual indicate the
relative importance of cautions and warnings.

Indicates that incorrect operation presents

DANGER

extreme danger of accident resulting in
death or serious injury to the user.

Indicates that incorrect operation presents

WARNING

a significant hazard that could result in
serious injury or death to the user.

Indicates that incorrect operation

CAUTION

presents a possibility of injury to the
user or damage to the instrument.

Indicates advisory items related to

NOTE

performance or correct operation of the
instrument.

Accuracy

We define measurement tolerances in terms of f.s.
(full scale), rdg. (reading) and dgt. (digit) values,
with the following meanings:

f.s. (maximum display value or scale length)

The maximum displayable value or scale length.
This is usually the name of the currently selected
range.

rdg. (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-significant
digit.Accuracy

v______________________________ _____________________

___________________________________________________

Safety Information

vi________________________ ___________________________

Measurement categories

This instrument complies with CAT III safety
requirements.
To ensure safe operation of measurement
instruments, IEC 61010 establishes safety standards
for various electrical environments, categorized as
CAT II to CAT IV, and called measurement
categories. These are defined as follows.

CAT II

CAT III

CAT IV

Using a measurement instrument in an environment
designated with a higher-numbered category than
that for which the instrument is rated could result in
a severe accident, and must be carefully avoided.
Use of a measurement instrument that is not CAT­rated in CAT II to CAT IV measurement
applications could result in a severe accident, and
must be carefully avoided.

Primary electrical circuits in equipment
connected to an AC electrical outlet by a
power cord (portable tools, household
appliances, etc.)
CAT II covers directly measuring
electrical outlet receptacles.

Primary electrical circuits of heavy
equipment (fixed installations) connected
directly to the distribution panel, and
feeders from the distribution panel to
outlets.

The circuit from the service drop to the
service entrance, and to the power meter
and primary overcurrent protection device
(distribution panel).

___________________________________________________

Safety Information

vii___________________________________________________

___________________________________________________

Safety Information

viii___________________________________________________

Operating Precautions

Follow these precautions to ensure safe operation
and to obtain the full benefits of the various
functions.

DANGER

To avoid short circuits and potentially life­threatening hazards, never attach the clamp to
a circuit that operates at more than 600 Vrms.
The maximum rated voltage to earth is 600
Vrms. Attempting to measure voltage in excess
of the maximum rated voltage to earth could
destroy the instrument and result in personal
injury or death.
This instrument should only be connected to
the secondary side of a breaker, so the breaker
can prevent an accident if a short circuit
occurs. Connections should never be made to
the primary side of a breaker, because
unrestricted current flow could cause a serious
accident if a short circuit occurs.
To avoid electric shock, do not touch the
portion beyond the protective barrier during
use.
Never apply voltage to the test leads when the
Resistance measurement, Continuity Check
modes are selected. Doing so may damage the
instrument and result in personal injury.
To avoid electrical accidents, remove power
from the circuit before measuring.

___________________________________________________

Operating Precautions

WARNING

Do not allow the instrument to get wet, and do
not take measurements with wet hands. This
may cause an electric shock.
To avoid electric shock when measuring live
lines, wear appropriate protective gear, such as
insulated rubber gloves, boots and a safety
helmet.
During current measurement, to avoid an
electric shock accident, do not connect the test
leads or temperature probe to the instrument.
Input voltage exceeding 600 Vrms (1000 V max.)
with respect to ground could damage the
instrument and result in personal injury.
Be sure to insert them with the correct polarity.
Otherwise, poor performance or damage from
battery leakage could result.
To avoid electric shock when replacing the
battery, first disconnect the clamp from the
object to be measured.
After replacing the battery, replace the cover
and screws before using the instrument.
To avoid the possibility of explosion, do not
short circuit, disassemble or incinerate
batteries.
Handle and dispose of batteries in accordance
with local regulations.

ix___________________________________ ________________

___________________________________________________

Operating Precautions

x______________ _____________________________________

WARNING

･

To prevent electric shock, when measuring the

voltage of a power line use a test lead that
satisfies the following criteria:

･

Conforms to safety standards IEC61010 or

EN61010

･

Of measurement category III or IV

･

Its rated voltage is higher than the voltage to
be measured
The test leads provided with this instrument
conform to the safety standard EN61010.
Use a test lead in accordance with its defi ned
measurement category and rated voltage.
Do not use the instrument where it may be
exposed to corrosive or combustible gases.
The instrument may be damaged or cause an
explosion.

___________________________________________________

Operating Precautions

CAUTION

Do not store or use the instrument where it could
be exposed to direct sunlight, high temperature or
humidity, or condensation. Under such conditions,
the instrument may be damaged and insulation
may deteriorate so that it no longer meets
specifications.
This instrument is designed for use indoors. It can
be operated at temperatures between 0 and 40
without degrading safety.
Keep the clamp jaws and core slits free from
foreign objects, which could interfere with clamping
action.
For safety reasons, when taking measurements,
only use the Model L9207-10 Test Lead provided
with the instrument.
To avoid damage to the instrument, do not exceed
the maximum input current rating, which depends
on the frequency of the current being measured
(see Fig.3 of 4.1.1) Be careful about the evolution
of heat, when the input frequency is high.
The " " indicator lights up when the remaining
battery capacity is low. In this case, the
instrument's reliability is not guaranteed. Replace
the battery immediately.
When replacing the battery, make sure that the
metal battery snap fitting is firmly connected. If the
metal fitting is loose, adjust it and recheck the
connection. If it isn't connected securely, the
power may not be turned on, and a power may be
turned off during the use.

___________________________________________________

Operating Precautions

xi______________________________ _____________________

xii___________________________________________________

CAUTION

To avoid damage to the instrument, protect it from
physical shock when transporting and handling. Be
especially careful to avoid physical shock from
dropping.
Do not exert excessive pressure on the clamp
sensor or attempt to wedge the sensor into a tight
spot for measurement.
The protection rating for the enclosure of this
device (based on EN60529) is *IP40.
*IP40:
This indicates the degree of protection provided by
the enclosure of the device against use in
hazardous locations, entry of solid foreign objects,
and the ingress of water.
4: Protected against access to hazardous parts

with wire measuring 1.0 mm in diameter. The
equipment inside the enclosure is protected
against entry by solid foreign objects larger than

1.0 mm in diameter.

0: The equipment inside the enclosure is not

protected against the harmful effects of water.

___________________________________________________

Operating Precautions

CAUTION

Removable sleeves are attached to the metal pins
at the ends of the test leads.
To prevent a short circuit accident, be sure to use
the test leads with the sleeves attached when
performing measurements in the CAT III
measurement category. In a CATII environment, if
the tips of the test leads do not reach the
measurement object, remove the rigid insulating
sleeve before measuring.
For details on measurement categories, see

“

Measurement categories”(page vi) in the
instruction manual.
When performing measurements with the sleeves
attached, be careful to avoid damaging the
sleeves. If the sleeves are inadvertently removed
during measurement, be especially careful in
handling the test leads to avoid electric shock.
To prevent an electric shock accident, confirm that
the white or red portion (insulation layer) inside the
cable is not exposed. If a color inside the cable is
exposed, do not use the cable.

xiii___________________________________________________

___________________________________________________

Operating Precautions

xiv________________________ ___________________________

NOTE

Correct measurement may be impossible in the
presence of strong magnetic fields, such as near
transformers and high-current conductors, or in the
presence of strong electromagnetic fields such as
near radio transmitters.

To avoid corrosion from battery leakage, remove the
batteries from the instrument if it is to be stored for
a long time.

Hall elements are used in the current detection
portion of the clamp on AC/DC HiTester. As there
are two types of drifts in the Hall elements, drift
depending on time and drift depending on the
surrounding temperature, take note when conducting
continuous measurements.

The Hall elements lack uniformity, and it is
impossible to determine the amount of variation
which depends on time and the temperature. When
conducting continuous measurement or in an
environment where there are huge temperature
variations, it is recommended that the variation at
point 0 when nothing has been inputted should be
first noted. The variation at point 0 is the direct
current component.This does not affect the AC
mode.

･

Due to the offset peculiar to elements from a hall

effect, the display may sometimes not show 0
immediately after it is turned on, but this is not a
malfunction. The count remaining has an
instrumental difference of 0 to a few tens A.

･

When using in DC or AC/DC mode, press the

0ADJ/RESET key each time the power is turned

on to carry out auto zero adjustment.
When 0 is displayed after zero adjustment, the
measurement can be performed without the
interference of the count remaining immediately
after the power is turned on.

___________________________________________________

Operating Precautions

Preliminary Check

Before using the instrument the first time, verify
that it operates normally to ensure that the no
damage occurred during storage or shipping.
If you find any damage, contact your dealer or
Hioki representative.

WARNING

Before using the instrument, make sure that the
insulation on the test leads is undamaged and
that no bare conductors are improperly exposed.
Using the instrument in such conditions could
cause an electric shock, so contact your dealer or
Hioki representative for replacements. (Model
L9207-10 Test Lead).

xv___________________________________________________

___________________________________________________

Preliminary Check

xvi________________________ ___________________________

___________________________________________________

Preliminary Check

1.1 Product Overview

The 3285-20 Clamp-on AC/DC HiTester makes it
possible to measure DC, AC or AC+DC current in
live power lines without tapping into or connecting
the lines.
And it is also possible to measure voltage, frequency
and resistance, and check circuit continuity.

1_______________________________________________________

Chapter 1

Overview

_______________________________________________________

1.1 Product Overview

2_______________________________________________________

1.2 Features

Large current measurement

Allows measurement of large current up to 2000 A.

Display of true rms values

The true rms value conversion circuit allows
accurate measurement of currents with distorted
waveforms.

Measurement for AC/DC

The instrument permits measurement of AC
superimposed on DC, as well as measurement of
half- and full-wave rectification.

Peak measurement

Allows measurement of peak hold values for either
voltage or current. Transitional peak values can
also be measured.

REC function

Displays the maximum and minimum measured
values.

_______________________________________________________

1.2 Features

1.3 Names and Functions of Parts

3285-20

11

3_______________________________________________________

10

15

12

16

1
2
3
4

5
6

9
8
7

13

14

_______________________________________________________

1.3 Names and Functions of Parts

4_______________________________________________________

POWER

1

Used to turn power on/off
To disable the auto power-off function, hold

button

POWER

, when you turn power on.

and press

2

HOLD

Switches current modes as follow.

DCA AC+DCAACA

3

RANGE

button

Switches between auto and manual ranges in
measurements of current, voltage, or frequency.
Switches manual ranges.
Displays a cursor on the bar graph to show the
selected range.
The current ranges are 200 A and 2000 A. The
voltage ranges are 30 V, 300 V and 600 V. The
frequency ranges are 10 Hz, 100 Hz and 1000 Hz.
Auto-ranging is used for resistance measurement.

HOLD

4

button

Used to suspend or inac tivate the screen-updating
function.
To disable the auto power-off function when
powering on, hold

HOLD

button and press

POWER

button.

_______________________________________________________

1.3 Names and Functions of Parts

A

Ω /

5

button

Switches between resistance measurement and
continuity checking.

Ω

SLOW/PEAK/Hz

6

button

SLOW slows down screen updating speed (once per
three seconds).
FAST speeds up screen updating speed (four times
per second). There isn't an annunciator "

FAST

Instead, the unit symbol blinks.

PEAK measures peak values (Peak Hold).
Hz measures frequency (in AC or AC+DC mode).

button

7

Switches voltage modes as follows.

5_______________________________________________________

".

MAX/MIN

8

DCV AC+DCV

CV

button

Displays the maximum value (MAX), the minimum
value (MIN), or the average value (AVE) of the
maximum and minimum values for the recording
(REC) function.
MAX d isplays the maximum measured value after
the REC function is activated.

MIN displays the minimum measured value after the
REC function is activated.
AVE displays the average value of the maximum

and minimum measured values after the REC
function is activated.
The auto power-off function is disabled.
Not available during resistance measurement.

_______________________________________________________

1.3 Names and Functions of Parts

6_______________________________________________________

0ADJ/RESET

9

Performs auto-zero-adjustment in DC A, AC+DC A
and DC V modes.
Resets data when measuring peak values. Reset all
the data in a REC function.
If zero is not indicated under no input in the AC A,
AC+DC A, AC V or AC+DC V modes, press

HOLD

, then press

0ADJ/RESET

to perform a zero-

cancel correction.

10 Clamp sensor

To measure current, open the top ends of the clamp
sensor by gripping the lever 12. Then position the
conductor to be measured at the center of the clamp
sensor and firmly close the clamp sensor.

11 Protective barrier

Be careful to not touch the clamp sensor beyond the
safety barrier when clamping onto a conductor for
measurement.

12 Lever

Used to open and close the clamp sensor.

_______________________________________________________

1.3 Names and Functions of Parts

13 Display (LCD)

Direct Current (DC)
Alternating Current (AC)
Alternating Current and Direct

Current (AC+DC)
Auto-zero-adjustment or zero-

ADJ

cancel correction function is
active

Battery low warning

HOLD
APS

AUTO
SLOW
REC

MAX
MIN

AVE

Data hold function
Auto power off function
Auto-range
Counter update once every 3

seconds
Record function
Maximum value
Minimum value
Average value = (MAX + MIN)/

2

7_______________________________________________________

_______________________________________________________

1.3 Names and Functions of Parts

8_______________________________________________________

Ω

Hz
V
PEAK
RMS
A
hour
min

14 Voltage/resistance input terminal (V, Ω,and

COM terminals)

Connected to the L9207-10 Test Lead (red and
black, supplied with the instrument) to measure
voltage or resistance.

15 Back case

To replace the battery, remove the two screws.

16 Hand strap

Attach to get a better grip on the instrument.

Resistance
Continuity
Frequency
Voltage
Wave peak value
True root mean square value
Current
1 hour/segment (bar graph)
1 minute/segment (bar graph)
Input over (bar graph)

_______________________________________________________

1.3 Names and Functions of Parts

L9207-10 TEST LEAD

9_______________________________________________________

1

2

1Protectivebarrier

Be careful to not touch the metal part of the test
lead beyond the safety barrier when contacting a
conductor for measurement.

2 Sleeve

Attach to the pins to prevent short circuit accidents.

CAUTION

・

Be sure to use the test leads with the sleeves
attached when performing measurements in the
CAT III measurement category. In a CAT II
environment, if the tips of the test leads do not
reach the measurement object, remove the rigid
insulating sleeve before measuring.

・

When performing measurements with the sleeves
attached, be careful to avoid damaging the
sleeves. If the sleeves are inadvertently removed
during measurement, be especially careful in
handling the test leads to avoid electric shock.

・

The tips of the metal pins are sharp, so take care
not to injure yourself.

■

Removing and attaching the sleeves.

Removing the
sleeves

Gently hold the bottom of the sleeves and
pull the sleeves off.Safely store the
removed sleeves so as not to lose them.

Attaching the
sleeves

_______________________________________________________

Insert the metal pins of the test leads into
the holes of the sleeves, and firmly push
them all the way in.

1.3 Names and Functions of Parts

10_______________________________________________________

t

1.4 Flowchart of button Operations

1.4.1 Current Measurements Mode

button

RANGE

button

SLOW/PEAK/Hz

button

MAX/MIN

button

0ADJ/RESET

button

DCA AC+DCAACA

AUTO range

200.0 A range
2000 A range

SLOW
FAST
PEAK
NORMAL

MAX

MIN

AVE

Instantaneous
value

Auto-zero­adjustmen

AUTO range

200.0 A range
2000 A range

SLOW

FAST

PEAK

Hz

NORMAL

MAX

MIN

AVE

Instantaneous
value

Disabled Auto-zero-

AUTO range

200.0 A range
2000 A range

SLOW

FAST
PEAK

NORMAL

MAX

MIN

AVE

Instantaneous
value

Hz

adjustment

HOLD+0ADJ/RESET

button

Disabled zero-cancel

correction

zero-cancel
correction

* Neither "FAST" or "NORMAL" annunciator is on

_______________________________________________________

1.4 Flowchart of button Operations

the display.

A

A

A

A

A

z

z
A

A

v

v

v

1.4.2 Voltage Measurements Mode

11_______________________________________________________

button

RANGE

button

SLOW/PEAK/Hz

button

MAX/MIN

0ADJ/RESET

button

DC V AC+DC VAC V

UTO range

30.00 V range

300.0 V range

600 V range

SLOW

FAST
PEAK

NORMAL

button

MAX

MIN

VE

Instantaneous

alue

uto-zero-

adjustment

UTO range

30.00 V range

300.0 V range

600 V range

SLOW

FAST
PEAK

Hz

NORMAL

MAX

MIN

VE

Instantaneous

alue

Disabled Disabled

HOLD+0ADJ/RESET

button

Disabled

ero-cancel

correction

* Neither "FAST" or "NORMAL" annunciator is on

the display.

UTO range

30.00 V range

300.0 V range

600 V range

SLOW

FAST
PEAK

Hz

NORMAL

MAX

MIN

VE

Instantaneous

alue

ero-cancel

correction

_______________________________________________________

1.4 Flowchart of button Operations

12_______________________________________________________

1.4.3 FrequencyMeasurements Mode

Current (AC A, AC+DC A) mode
Voltage (AC V, AC+DC V) mode

SLOW/PEAK/Hz

button

RANGE

button

SLOW

Current mode Voltage mode

AUTO range

10.00 Hz range

100.0 Hz range

1000 Hz range

Hz NORMAL

PEAKFAST

AUTO range

10.00 Hz range

100.0 Hz range

1000 Hz range

MAX/MIN

0ADJ/RESET

button

MAX

MIN

AVE

Instantaneous
value

Disabled Disabled

Instantaneous
value

MAX

MIN

AVE

button

1.4.4 Resistance Measurements Mode

button

Ω/

_______________________________________________________

1.4 Flowchart of button Operations

Ω

1.5 Modes

For voltage and current, three modes are provided:
DC (direct current, ), AC (alternating current, ),
and AC+DC (alternating current and direct current,

) modes. Select a proper mode according to the

waveform shown below:

Mode

DC

( )

Input

waveform

0

0

Display

O Average value

displayed

(with polarity)
Not measurable

13_______________________________________________________

0

Not measurable

(zero displayed)

ORMSvalue

AC

( )

0

0

Not measurable

Not measurable

0

ORMSvalue

(without polarity)

ORMSvalue

AC+DC

( )

0

0

ORMSvalue

0

_______________________________________________________

1.5 Modes

14_______________________________________________________

_______________________________________________________

1.5 Modes

)

Chapter 2

y

Measurement

2.1 Preparations

2.1.1 Installingor Replacingthe Batter

CAUTION

Do not fix the back casing screws too tightly.
The torque about 0.5N･m is recommended.

1. Remove the two fastening screws of the rear cover,
using a Phillips screwdriver.

2. Remove the rear cover.

3. Remove the old battery without pulling the codes of
the snap.

4. Securely connect the battery to the battery snap.

5. Replace the rear cover and tighten the fastening
screws.

15_______________________________________________________

Battery: 6F22(006P

_______________________________________________________

2.1 Preparations

16_______________________________________________________

p

2.1.2 Attachingthe Hand Stra

Explains how to attach the hand strap, for easy
handling of the instrument in the field.

2.1.3 Turningthe Power On and Off

Power ON

1. Press

POWER

to turn the instrument on. Verify that
all segments of the display light up briefly. Then the
model name is shown, and the bar graph indicates
the battery condition.

Fresh battery
Battery capacity 50%

Batterycapacity0
Beep tone sounds 3 times

2. The DC current measurement mode is activated.

_______________________________________________________

2.1 Preparations

(

)

Power OFF

1. Press

POWER

to turn the instrument off.

2.1.4 Battery Low Warning
When mark lights

The " " indicator lights up when the remaining
battery capacity is low. In this case, the instrument's
reliability is not guaranteed. Replace the battery
immediately.
To check remaining battery life, check the bar
graph, when powering on. (See 2.1.3: Turning the
Power On and Off) The bar graph provides a rough
approximation of remaining battery life. Be careful
for the battery life especially when using the REC
function.
Batteries tend to increase in voltage somewhat when
left unused for a long period. Even if the battery
warning annunciator becomes temporarily off after
the period, replace the battery as soon as possible.
If the battery is not replaced at this point in time,
the annunciator may not light up immediately on the
next occasion. Replace a new battery before it ruins
a measurement or causes some other inconvenience.
(See 2.1.1: Installing or Replacing the Battery)

Low battery voltage detection function

After the
below a certain level, the power goes off
automatically. When this occurs, bAtt and Lo are
displayed.
When power goes off after display of these marks,
replace the exhausted battery with a new one.

mark lights and battery voltage drops

17_______________________________________________________

_______________________________________________________

2.1 Preparations

18_______________________________________________________

2.1.5 Pre-Operation Inspection

Confirm the following before using the meter:

The tips of the clamp-on sensor must not be
deformed.

(Correct measurement may be impossible if the tips
are deformed.)

The clamp-on sensor must not be cracked or
damaged, and there must be no bare metal
exposed.

(To avoid electric shock, do not use a clamp-on
sensor with cracks or other damage, or exposed
metal.)

The meter must be undamaged.

(To avoid electric shock, do not use the meter if it
is damaged.)

Test lead insulation must not be scratched
or torn, and there must be no metal
exposed.

(If damage is found, to avoid electric shock, replace
with Model L9207-10.)

The batteries should be in good condition
when power is turned on.

(The "
battery capacity is low. In this case, the instrument's
reliability is not guaranteed. Replace the battery
immediately.)

The display should show close to 0 A in ACA
mode.

In DCA mode, pressing the 0ADJ/RESET
button should display close to 0 A.

In ACV mode, shorting the test leads should
display close to 0 V.

In Ω mode, shorting the test leads should

_______________________________________________________

2.1 Preparations

display close to 0 Ω.

" indicator lights up when the remaining

2.2 Current Measurement

)

19_______________________________________________________

NOTE

Correct measurement may be impossible in the
presence of strong magnetic fields, such as near
transformers and high-current conductors, or in the
presence of strong electromagnetic fields such as
near radio transmitters.
Attach the clamp around only one conductor.
Single-phase (2-wire) or three-phase (3-wire) cables
clamped together will not produce any reading.

○

The display may show a measured value bigger than
the actual value due to a magnet:c field interference.
The interference is less than 2 A during the
measurement.

×

2.2.1 MeasuringDC Current(DC A

1. Press button to display .

2. Switch between the auto range and the manual range
as necessary.

3. Please execute auto zero adjustment before
measuring. Press
zero-adjustment (without clamping the measured
conductor inside the clamp sensor) with the clamp
sensor firmly closed. (see 3.1.1: Auto-zero­adjustment function).

ADJ

annunciator lights to indicate that auto-zero­adjustment is complete. (If you make an auto-zero­adjustment in the auto range, two current ranges will

_______________________________________________________

be adjusted in this mode.)

0ADJ/RESET

to make an auto-

2.2 Current Measurement

20_______________________________________________________

When 0 is displayed after zero adjustment, the
measureme nt can be performed without the
interference of the count remaining immediately after
the power is turned on.

4. Open the top ends of the clamp core, orient the
current direction indicator on the clamp in the
current direction of the measured conductor, and
clamp the conductor so that it passes through the
center of the clamp core.

Wrong

Current direction

Measured conductor

Current direction
indicator

NOTE

The DC A mode permits only DC current
measurements that does not include the AC
component (See 1.5: Modes).
The 200 A range will display up to 250 A, however,
only the range from 10 A to 200 A can be displayed
with guaranteed accuracy.
At any range, gross errors may occur at 1% or
below of the range, whose accuracy is not
guaranteed, as a result of internal corrective
calculations.
The value may sometimes not show 0 when the
power is switched on, but this is not an instrument
fault. Please execute auto zero adjustment before
measuring.

_______________________________________________________

2.2 Current Measurement

2.2.2 MeasuringAC Current(AC A

)

1. Press button to display .

2. Switch between the auto range and the manual range
as necessary.

3. Open the top ends of the clamp core and clamp the
measured conductor so that it passes through the
center of the clamp core.

21_______________________________________________________

NOTE

Just after suspension of input, or when modes are
switched under no input, the counter would not
become zero for about 10 seconds. This is normal
and simply reflects the workings of the internal
circuit. But you can measure with guaranteed
accuracy before the counter becomes zero.
Depending on ambient temperatures, the counter
would not become zero under no input. If this
happens, perform a zero-cancel correction (See

3.1.2: Zero-Cancel Correction Function).
During a f.s. input, the measurement response speed
is about 250 ms during rise (0% to 90%) and about
500 ms (100% to 10%) during fall (See: Figs. 1 and

2).
The AC A mode does not allow measurement of DC
waveforms, full-wave rectification waveforms, half­wave rectification waveforms, or DC+AC
waveforms (See 1.5: Modes).
The 200 A range will display up to 250 A, however,
only the range from 10 A to 200 A can be displayed
with guaranteed accuracy.
At any range, gross errors may occur at 1% or
below of the range ,whose accuracy is not
guaranteed, as a result of internal corrective
calculations.

_______________________________________________________

2.2 Current Measurement

22_______________________________________________________

e

)

Input wave

200 A
100 A

250 ms

Response wav

Fig. 1 Waveform of Measurement Response (Rise)

Response waveInput wave

500 ms

Fig. 2 Waveform of Measurement Response (Fall)

2.2.3 MeasuringAC/DC Current(AC+DC A

1. Press button to display .

2. Switch between the auto range and the manual range
as necessary.

3. Please execute auto zero adjustment before
measuring. Press
zero-adjustment (without clamping the measured
conductor inside the clamp sensor) with the clamp
sensor firmly closed. (see 3.1.1: Auto-zero­adjustment function).

ADJ

annunciator lights to indicate that auto-zero­adjustment is complete. (If you make an auto-zero­adjustment in the auto range, two current ranges will

_______________________________________________________

2.2 Current Measurement

be adjusted in this mode.)

0ADJ/RESET

to make an auto-

When 0 is displayed after zero adjustment, the
measureme nt can be performed without the
interference of the count remaining immediately after
the power is turned on.

4. If the counter fails to become zero under no input,
press

HOLD

button and then press

0ADJ/RESET

button to perform a zero-cancel correction.

5. Open the top ends of the clamp core and clamp the
measured conductor so that it passes through the
center of the clamp core.

NOTE

Just after suspension of input, or when modes are
switched under no input, the counter would not
become zero for about 10 seconds. This is normal
and simply reflects the workings of the internal
circuit. But you can measure with guaranteed
accuracy before the counter becomes zero.
Depending on ambient temperatures, the counter
would not become zero under no input. If this
happens, preform a zero-cancel correction (See

3.1.2: Zero-Cancel Correction Function).
The polarity of the input is not displayed, even if
DC current is measured in this mode. If the clamp
sensor is reoriented, the measured values may
change, but the values are within the guaranteed
accuracy. (In case that you would like to measure a
DC current which doesn't have AC components, you
should make the measurement in DC A mode.)
During a f.s. input, the measurement response speed
is about 250 ms during rise (0% to 90%) and about
500 ms (100% to 10%) during fall (See 2.2.2
Measuring AC Current (AC A), Figs. 1 and 2).
The 200 A range will display up to 250 A, however,
only the range from 10 A to 200 A can be displayed
with guaranteed accuracy.

23_______________________________________________________

_______________________________________________________

2.2 Current Measurement

24_______________________________________________________

At any range, gross errors may occur at 1% or below of the
range,whose accuracy is not guaranteed as a result of
internal corrective calculations.
The value may sometimes not show 0 when the power is
switched on, but this is not an instrument fault. Please
execute auto zero adjustment before measuring.

2.2.4 Peak Hold Measurement

The peak value of measured current is retained on
the display to simplify reading. Peak fluctuations
canalsobeviewed.

1. Press button and select a measurement mode for
the measured circuit.

2. In DC A and AC+DC A modes, make an auto-zero­adjustment by
Auto-Aero Adjustment Function).

3. Set to PEAK. The measurement mode is switched

SLOW/PEAK/Hz

by

0ADJ/RESET

button as follows.

button (See 3.1.1:

SLOW PEAKFAST

(The unit

symbol blinks.)

Hz

(Except

DC)

NORMAL

4. Switch between the auto and the manual range as
necessary. (If you are unable to estimate the peak
current value, start at the 2000A range.)

5. Before the measurement, press

0ADJ/RESET

button

to reset the residual data.

6. Open the top ends of the clamp core and clamp the
measured conductor so that it passes through the
center of the clamp core.

_______________________________________________________

2.2 Current Measurement

NOTE

A

25_______________________________________________________

The polarity of the input is not displayed during
peak measurements. The measured values may
change if the clamp sensor is reoriented, but the
values are within the guaranteed accuracy.
You can capture from pulses with a width of about
more than 1ms.
Even after clamping, press

0ADJ/RESET

button to
reset the data as necessary.
In case that the counter doesn't become zero under
no input in peak measurement mode, even though
you pressed

0ADJ/RESET

button to reset the peak
data, the clamp sensor may be magnetized. Quit the
peak measurement mode, and perform the auto-zero
adjustment by

0ADJ/RESET

button . Then make
the settings again. (A few counts would remain,even
if you push

0ADJ/RESET

button .)
The hold value does not change, unless a larger
value is measured, but be careful to avoid accidental
loss of data resulting from the auto power-off
function. (See 3.5: Automatically Turning Power
off (Auto Power-Off Function APS))
Use the REC function to make measurements longer
than the auto power OFF time.
To check transitional peak value, press

MAX/MIN

button to shift to the instantaneous value (no
annunciator).

MAX

_______________________________________________________

VEMIN Instantaneous value

(no annunciator)

2.2 Current Measurement

26_______________________________________________________

)

2.3 Voltage Measurement

CAUTION

For safety reasons, when taking measurements, only
use the L9207-10 Test Lead provided with the
instrument.

2.3.1 MeasuringDC Voltage(DC V

1. Press button to display .

2. Insert the red test lead to V/Ω and the black test
lead to COM of the voltage/resistance input
terminal.

3. Switch between the auto range and the manual range
as necessary.

4. In case that the counter isn't zero, press

0ADJ/RESET

adjustment.
auto-zero-adjustment is complete. (See 3.1.1: Auto­Zero-Adjustment Function)

5. Attach or remove the rigid insulating sleeve as
required by the measurement category.

6. Carefully contact the test leads to a circuit.

NOTE

Be sure to use the test leads with the sleeves
attached when performing measurements in the CAT
III measurement category. In a CAT II environment,
if the tips of the test leads do not reach the
measurement object, remove the rigid insulating
sleeve before measuring.

_______________________________________________________

2.3 Voltage Measurement

button to make an auto-zero-

ADJ

annunciator lights to indicate that

NOTE

)

You can perform the auto-zero-adjustment up to 4%
of the range.
A lit - annunciator indicates that potential is higher
at the black test lead than at the red test lead.
The DC V mode permits only DC voltage

measurements that does not include the AC
component (See 1.5: Modes).
Every range will display up to 125% of the range,
however, only the range from 10% to 100% can be
displayed with guaranteed accuracy.
At any range, gross errors may occur at 1% or belo w
of the range, whose accuracy is not guaranteed, as a
result of internal corrective calculations.

2.3.2 MeasuringAC Voltage(AC V

1. Press

2. Insert the red test lead to V/Ω and the black test lead
to COM of the voltage/resistance input terminal.

3. Switch between the auto range and the manual range
as necessary.

4. Attach or remove the rigid insulating sleeve as
required by the measurement category.

5. Carefully contact the test leads to a circuit.

NOTE

Be sure to use the test leads with the sleeves
attached when performing measurements in the CAT
III measurement category. In a CAT II environment,
if the tips of the test leads do not reach the
measurement object, remove the rigid insulating
sleeve before measuring.
Just after suspension of input, or when modes are
switched under no input, the counter would not
become zero for about 10 seconds. This is normal
and simply reflects the workings of the internal
circuit. But you can measure with guaranteed
accuracy before the counter becomes zero.

to display～.

27_______________________________________________________

_______________________________________________________

2.3 Voltage Measurement

28_______________________________________________________

)

NOTE

Depending on ambient temperatures, the counter would
not become zero under no input, if this happens, press

HOLD

button and then press

0AD J /RESET

button to
perform a zero-cancel correcti on. (See 3.1.2: Zero­Cancel Correction Function)
During a f.s. input, the measurement response speed
is about 250 ms during rise (0% to 90%) and about
500 ms (100% to 10%) during fall (See 2.2.2:
Measuring AC Current (AC A), Figs. 1 and 2).
The AC V mode does not allow measurement of DC
waveforms, full-wave rectification waveforms, half­wave rectification waveforms, or DC+AC
waveforms (See 1.5: Modes).
Every range will display up to 125% of the range,
however, only the range from 10% to 100% can be
displayed with guaranteed accuracy.
At any range, gross errors may occur at 1% or below
of the range, whose accuracy is not guaranteed, as a
result of internal corrective calculations.

2.3.3 MeasuringAC/DC Voltage(AC+DC V

1. Press

2. Insert the red test lead to V/Ω and the black test lead
to COM of the voltage/resistance input terminal.

3. Switch between the auto range and the manual range
as necessary.

4. If the counter fails to become zero under no input,
press
button to perform a zero-cancel correction. (See

3.1.2: Zero-Cancel Correction Function)

5. Attach or remove the rigid insulating sleeve as
required by the measurement category.

6. Carefully contact the test leads to a circuit.

button to display .

HOLD

button and then press

0ADJ/RESET

_______________________________________________________

2.3 Voltage Measurement

NOTE

Be sure to use the test leads with the sleeves
attached when performing measurements in the CAT
III measurement category. In a CAT II environment,
if the tips of the test leads do not reach the
measurement object, remove the rigid insulating
sleeve before measuring.
Just after suspension of input, or when modes are
switched under no input, the counter would not
become zero for about 10 seconds. This is normal
and simply reflects the workings of the internal
circuit. But you can measure with guaranteed
accuracy before the counter becomes zero.
The polarity of the input is not displayed, even if DC
voltage is measured in this mode. If the connections
of test leads are moved, the measured values may
change, but the values are within the guarantee d
accuracy. (In case that you would like to measure DC
voltage which doesn't have AC components, you
should make the measurement in DC V mode.)
During a f.s. input, the measurement response speed
is about 250 ms during rise (0% to 90%) and about
500 ms (100% to 10%) during fall (See 2.2.2:
Measuring AC Current (AC A), Figs. 1 and 2).
Every range will display up to 125% of the range,
however, only the range from 10% to 100% can be
displayed with guaranteed accuracy.
At any range, gross errors may occur at 1% or below

of the range, whose accuracy is not guaranteed, as a
result of internal corrective calculations.

2.3.4 Peak Hold Measurement

The peak value of measured voltage is retained on the display
to simplify reading. Peak fluctuations can also be viewed.

29_______________________________________________________

1. Press

and select a measurement mode for the

measured circuit.

2. Insert the red test lead to V/Ω and the black test lead
to COM of the voltage/resistance input terminal.

_______________________________________________________

2.3 Voltage Measurement

30_______________________________________________________

3. Set to PEAK. The measurement mode is switched

by

SLOW/PEAK/Hz

as follow.

SLOW PEAKFAST

(The unit

symbol blinks.)

Hz

(Except

DC)

4. Switch between the auto and the manual range as
necessary. (If you are unable to estimate the peak
voltage value, start at the 600 V range.)

5. Attach or remove the rigid insulating sleeve as
required by the measurement category.

6. Carefully contact the test leads to a circuit.

7. Before the measurement, press

0ADJ/RESET

to reset the residual data.

NOTE

Be sure to use the test leads with the sleeves
attached when performing measurements in the CAT
III measurement category. In a CAT II environment,
if the tips of the test leads do not reach the
measurement object, remove the rigid insulating
sleeve before measuring.
The polarity of the input is not displayed during
peak measurements. If the connections of test leads
are moved, the measured values may change, but
the values are within the guaranteed accuracy.
You can capture from pulses with a width of about
more than 1ms.
To check transitional peak value, press

button to shift to the instantaneous value (no
annunciato r).
The zero adjustment is not effective at peak hold
measurement mode.

MAX AVEMIN Instantaneous value

(no annunciator)

NORMAL

button

MAX/MIN

_______________________________________________________

2.3 Voltage Measurement

31_______________________________________________________

2.4 Frequency Measurement

2.4.1 FrequencyMeasurement in Current Mode

1. Press button and select AC or AC+DC,

depending on the circuit to be measured.

2. If the current range of the measured circuit is
known, set the current range to the manual range.

SLOW/PEAK/Hz

3.
as follows. Select Hz by pressing the button. (The
unit symbol A blinks, and a current value is
displayed on the bar graph.)

SLOW PEAKFAST

(The unit

symbol blinks.)

4. Switch the auto range and the manual range as
necessary.

5. Open the top ends of the clamp core and clamp the
measured conductor so that it passes through the
center of the clamp core.

NOTE

At the 100 Hz and 1000 Hz ranges, ---- appears on
the counter when the frequency is lower than 10 Hz.

---- appears on the counter, if the frequency is lower
than 1 Hz.
O. L. appears on the counter, if the frequency is
higher than 1 kHz.
If an input value is significantly lower than the range,
an accurate measurement may not be achieved,
resulting in ----, O. L. or display fluctuations.

_______________________________________________________

button switches the annunciators

Hz NORMAL

2.4 Frequency Measurement

32_______________________________________________________

NOTE

The 10 Hz range or 100 Hz range will display up to
125% of each range, however, only the range from
10% to 100% can be displayed with guaranteed
accuracy.
The frequencies, whose waveforms are special such
as inverters, would not be measurable, when the
carrier frequencies are lower than several kHz.
Full-wave rectification indicates twice the actual
value, due to an AC coupling in the internal circuit.
It would take time to stabilize the counter,
depending on the frequency range or the input
frequency.

2.4.2 FrequencyMeasurement in VoltageMode

CAUTION

For safety reasons, when taking measurements, only
use the L9207-10 Test Lead provided with the
instrument.

1. Press

button and select AC or AC+DC,

depending on the circuit to be measured.

2. If the voltage range of the measured circuit is
known, set the voltage range to the manual range.

3. Insert the red test lead to V/Ω and the black test
lead to COM of the voltage/resistance terminal.

SLOW/PEAK/Hz

4.

button switches the annunciators

as follows. Select Hz by pressing the button. (The
unit symbol V blinks, and a voltage value is
displayed on the bar graph.)

SLOW PEAKFAST

_______________________________________________________

2.4 Frequency Measurement

(The unit

symbol blinks.)

Hz NORMAL

5. Switch between the auto range and the manual range
as necessary.

6. Attach or remove the rigid insulating sleeve as
required by the measurement category.

7. Carefully contact the test leads to a circuit.

NOTE

Be sure to use the test leads with the sleeves
attached when performing measurements in the CAT
III measurement category. In a CAT II environment,
if the tips of the test leads do not reach the
measurement object, remove the rigid insulating
sleeve before measuring.
At the 100 Hz and 1000 Hz ranges, ---- appears on
the counter when the frequency is lower than 10 Hz.

---- appears on the counter, if the frequency is lower
than 1 Hz.
O. L. appears on the counter, if the frequency is
higher than 1 kHz.
If an input value is significantly lower than the
range, on accurate measurement may not be
achieved, resulting in ----, O. L. or display
fluctuations.
The 10 Hz range or 100 Hz range will display up to
125% of each range, however, only the range from
10% to 100% can be displayed with guaranteed
accuracy.
The frequencies, whose waveforms are special such
as inverters, would not be measurable, when the
carrier frequencies are lower than several kHz.
Full-wave rectification indicates twice the actual
value, due to an AC coupling in the internal circuit.
It would take time to stabilize the counter,
depending on the frequency range or the input
frequency.

33_______________________________________________________

_______________________________________________________

2.4 Frequency Measurement

34_______________________________________________________

2.5 Resistance Measurement

DANGER

Never apply voltage to the test leads when the
Resistance measurement mode is selected. Doing
so may damage the instrument and result in
personal injury.
To avoid electrical accidents, remove power from
the circuit before measuring.

CAUTION

For safety reasons, when taking measurements, only
use the L9207-10 Test Lead provided with the
instrument.

1. Press

Ω/

button to display Ω. Auto-ranging is

used for resistance measurement.

2. Insert the red test lead to V/Ω and the black test
lead to COM of the voltage/resistance terminal.

3. Attach or remove the rigid insulating sleeve as
required by the measurement object.

4. Touch the tips of the red and black test leads
together and verify that 0 Ω is displayed.

5. Then connect the test leads to the test points for
measurement.

_______________________________________________________

2.5 Resistance Measurement

NOTE

35_______________________________________________________

If voltage is applied inadvertently, the internal
circuitry is protected up to 600 VAC.
If voltage larger than approximately 2 or 3 V is
input, the Resistance measurement mode cannot
be selected.
If the display shows larger than 7 or 8 A at 200 A
range in the DCA mode, the Resistance
measurement mode cannot be selected. Press the

0ADJ/RESET

key to reset the display to 0.

_______________________________________________________

2.5 Resistance Measurement

36_______________________________________________________

2.6 Continuity Check

DANGER

Never apply voltage to the test leads when the
Continuity check mode is selected. Doing so may
damage the instrument and result in personal
injury.
To avoid electrical accidents, remove power from
the circuit before measuring.

CAUTION

For safety reasons, when taking measurements, only
use the L9207-10 Test Lead provided with the
instrument.

1. Press

Ω/

button to display . Auto-ranging is

used for continuity checking.

2. Insert the red test lead to V/Ω and the black test lead
to COM of the voltage/resistance input terminal.

3. Attach or remove the rigid insulating sleeve as
required by the measurement object.

4. Touch the tips of the red and black test leads
together and verify that 0 Ω is displayed.

_______________________________________________________

2.6 Continuity Check

5. Then connect the test leads to the test points for
measurement.
The beeper sounds when the measured resistance is
below about 30 Ω.

・

NOTE

If voltage is applied inadvertently, the internal
circuitry is protected up to 600 VAC.

・

The measured resistance value appears on the digital
display.

・

If voltage larger than approximately 2 or 3 V is
input, the Continuity check mode cannot be
selected.

・

If the display shows larger than 7 or 8 A at 200 A
range in the DCA mode, the Resistance
measurement mode cannot be selected. Press the

0ADJ/RESET

key to reset the display to 0.

37_______________________________________________________

_______________________________________________________

2.6 Continuity Check

38_______________________________________________________

_______________________________________________________

2.6 Continuity Check

Chapter 3

Useful Functions

3.1 Adjusting and Correcting Values

3.1.1 Auto-Zero-Adjustment Function

The auto-zero-adjustment function is used to adjust
offsets in the internal circuit automatically that
result from temperature characteristics or clamp
sensor magnetization. The clamp core is
magnetized during a large DC current measurement,
or when a powerful magnet is placed close to the
clamp core.

1. Wait until the counter is stable under no input.
Then, press
lights.

0ADJ/RESET

button.

ADJ

annunciator

39_______________________________________________________

NOTE

_______________________________________________________

You can perform the auto-zero-adjustment, if the
counter displays within 45 A in a current mode.
When there is an input or the counter decreases, the
measurement accuracy will be spoiled by pressing
0ADJ/RESET as well as the accurate auto-zero­adjustment. If inaccurate auto-zero-adjustment is
performed, perform the correct procedure again.
It would take approximately 20 seconds to stabilize
the counter in AC+DC A mode.

3.1 Adjusting and Correcting Values

40_______________________________________________________

NOTE

Use the zero-cancel correction function if the
counter fails to revert to zero after correct auto-zero­adjustment in AC+DC A mode.
In a current mode, if you press

0ADJ/RESET

button
again during the auto-zero-adjustment in the internal
circuit, the auto-zero-adjustment is canceled.
The auto-zero-adjustment is not effective at auto
range in DCV mode. If you perform the auto-zero­adjustment at manual range, the auto-zero­adjustment is invalid by changing the range.

3.1.2 Zero-Cancel Correction Function

Use the zero-cancel correction function when the
counter fails to become zero under no input in AC
A, AC+DC A, AC V, or AC+DC V mode.

NOTE

1. Press

2. Press

HOLD

button to display

0ADJ/RESET

button.

When there is an input or the counter decreases, the
measured values will be evaluated lower by pressing

0AJD/RESET

button.

HOLD

annunciator.

ADJ

annunciator blinks.

If the counter is zero, the zero-cancel correction
function does not work.
In AC+DC A mode, the zero-cancel correction
function does not work, unless auto-zero-adjustment
is complete.
The zero-cancel correction function is not effective
at auto range in DCV mode. If you perform the
zero-cancel correction at manual range, the zero­cancel correction is invalid by changing the range.

_______________________________________________________

3.1 Adjusting and Correcting Values

3.2 Pausing and Reading the Display
(Data Hold Function HOLD )

This function freezes the counter at any desired
point for easy reading.

1. Press

HOLD

the display and the digital display value and bar
graph display are maintained.
If you press

RANGE

function, the bar graph display the present range.
The data hold function is available for all
measurements.

2. To cancel the data hold function, press
button again.

button.

HOLD

annunciator lights on

button during the data hold

HOLD

41_______________________________________________________

_______________________________________________________

3.2 Pausing and Reading the Display (Data Hold Function HOLD )

42_______________________________________________________

3.3 Alteration of Counter Updates

The counter is updated twice per second when
powering on. The counter update may be altered
according to measurement conditions.

SLOW/PEAK/Hz

follows:

button changes an annunciator as

SLOW PEAK

FAST

(The unit

annunciator blinks.)

Hz

(Except DC)

NORMAL

3.3.1 SLOW mode

If the counter fluctuates rapidly and is hard to read,
you can select a slower update rate (once every 3
seconds) by pressing

SLOW/PEAK/Hz

button.

3.3.2 FAST mode

For current measurements and voltage
measurements, the counter is updated four times per
second in FAST mode. You can measure abrupt
changes such as starting currents.
The unit symbol A or V blinks.
To facilitate reading when measuring a starting
current, use the record (REC) function to hold the
maximum value (MAX).

_______________________________________________________

3.3 Alteration of Counter Updates

3.4 Storing Values in Memory
(Recording Function REC)

Use the recording function to hold the maximum
and minimum measured values and
maximum/minimum averages. (Not available for
resistance measurements.)

1. Measurement indicated value

Pressing the
of current or voltage activates the recording
function. REC flashes and the instrument saves the
maximum value (MAX), minimum value (MIN),
and average value (AVE) in internal memory from
the instant you press the
Pressing the
function activated switches the display as shown
below. If MAX, MIN, or AVE is not displayed, an
instantaneous value is assumed.

MAX/MIN

MAX/MIN

button during measurements

MAX/MIN

button with the recording

43_______________________________________________________

button.

MAX→MIN→AVE→Instantaneous value

(no annunciator)

Data (MAX, MIN, AVE) remains displayed while
the display is switched. If maximum or minimum
data is updated in the meantime, however, the data
values will change.
With the recording function activated, the auto
power-off function remains disabled. (APS off.)
The average value (AVE) displayed is calculated by:
Average Value = [(Maximum value + Minimum
Value)/2].

_______________________________________________________

3.4 Storing Values in Memory (Recording Function REC)

44_______________________________________________________

If the recording function is activated and
Instantaneous value (no annunciator) selected after
you activate PEAK mode with the

SLOW/PEAK/Hz

button, you can see the fluctuation of the peak.

2. Display of Elapsed Time

When you press the

MAX/MIN

button to activate
the recording function, the bar graph segments flash
and the elapsed time appears.

When "min" is shown in the right-hand corner of
the bar graph, each segment of the bar graph
corresponds to one minute.
Every time one minute elapses, one segment of the
flashing bar graph goes on. When all segments on
the bar graph go on, the elapsed time is 30 minutes.
When the elapsed time exceeds 30 minutes, one
segment of the flashing bar graph goes off every
time one minute elapses.

When the segments left of a flashing segment
remain on: the number of "on" segments represents
the elapsed time (0 ~ 29).
The illustration below shows when 20 minutes have
elapsed:

_______________________________________________________

3.4 Storing Values in Memory (Recording Function REC)

45_______________________________________________________

When the segments right of a flashing segment
remain on: the number of "off" segments (+30)
represents the elapsed time (30 ~ 59).
The illustration below shows when 50 minutes have
elapsed:

When digital display switches the average value
(AVE) to a instantaneous value when you press the

MAX/MIN

button, the right corner of the bar graph
indicates hours. In this mode, each segment of the
bar graph corresponds to one hour. The way to read
the bar graph here is similar to reading it in
minutes. When all bar graph segments remain on,
the elapsed time is 29 hours.
The illustration below shows when one hour, 40
minutes have elapsed.

3. Deactivation of Recording Function

Pressing the
recording function.

HOLD

button deactivates the

HOLD

goes on, REC stops

flashing and goes on, and the elapsed time stops
incrementing.
While the recording function is being deactivated,
data is not updated, even if the clamp sensor is
disconnected from the conductor.
Pressing the

HOLD

button again cancels

HOLD

display and activates the recording function again,
with REC flashing again.

_______________________________________________________

3.4 Storing Values in Memory (Recording Function REC)

46_______________________________________________________

4. Resetting of Recording Function

Push

0ADJ/RESET

button, in the case that data is

reset during the recording function action.

5. Cancellation of Recording Function

To cancel the recording function, press the related
function button (

or ) for the measurement
in progress. Once the recording function is
canceled, the auto power-off function becomes
effective. (

APS

goes on.)

NOTE

For a long term measurement, check how much the
battery power remains. (Shown on the bar graph at
power on.)
When starting the recording function (REC)inan
auto range, the range is set as the range of when
that pushed

MAX/MIN

button.
When you need minimum value and average value
data, make sure to activate the recording function
during measurement. If the function is activated
when there is no input, the minimum value will
remain zero. To deactivate the recording function,
press the

HOLD

button and read min imum value
and average value to terminate measurement. If you
disconnect the clamp or test lead from the circuit
under measurement without deactivating the
recording function beforehand, the minimum value
will be zero.
When the instrument is turned off, accumulated data
are lost.

_______________________________________________________

3.4 Storing Values in Memory (Recording Function REC)

3.5 Automatically Turning Power Off
(Auto Power-Off Function APS )

47_______________________________________________________

When the

APS

annunciator is displayed, the auto
power-off function is active.
If no button is pressed for about 10 minutes, the
instrument turns itself off automatically.
Immediately before turning off automatically,
annunciator blinks and a beep tone is heard for
about 30 seconds.
By pressing any button except

POWER

button, you
will extend the powered state for another 10
minutes.

Procedure for disabling the auto power-off

function.

Press

POWER

button with holding down

HOLD

button, when you turn power on.
Use the recording function (REC) by pressing

MAX/MIN

button.

APS

_______________________________________________________

3.5 Automatically Turning Power Off (Auto Power-Off Function APS )

48_______________________________________________________

3.6 Beep Tone

To disable the beep tone

To disable the beep tone, hold

RANGE

when turning the instrument on by pressing
button.
Warning sounds and the continuity beep cannot be
disabled.

To enable the beep tone

The beep is re-enabled the next time you press the

POWER

button to turn the meter on.

button

POWER

_______________________________________________________

3.6 Beep Tone

Chapter 4

Specifications

4.1 Measurement Specifications

49_______________________________________________________

Temperature and humidity
for guaranteed accuracy

Guaranteed accuracy period

23 5 (73 9 ), 80%RH
or less (no condensation) (This is
guaranteed When "
not lighting.)

1 year, or opening and closing of
the Clamp Sensor 10,000 times,
whichever comes first

" mark is

4.1.1 Current Measurement Specifications

Current display accuracy

1. DC current A (mean value)

Range

(Accuracy Range)

200 A ( 10.0 to 200.0 A) 0.1 A 1.3%rdg. 3dgt.
2000 A ( 100 to 2000 A) 1A 1.3%rdg. 3dgt.

2. AC current Arms (true rms)

Range

(Accuracy Range)

200 A (10.0 to 200.0 A) 0.1 A 1.3%rdg. 3dgt. 2.0%rdg. 5dgt.

(100 to 1800 A)

2000 A

(1800 to 2000 A) 2.3%rdg. 3dgt.

Measurement response (during a f.s. input):
Rise response time (0% to 90%) 250 ms or less
Fall response time (100% to 10%) 500 ms or less

_______________________________________________________

Resolution DC

Resolution 45 to 66Hz

1A

1.3%rdg. 3dgt. 2.0%rdg. 5dgt.

4.1 Measurement Specifications

10 to 45,

66 to 1kHz

50_______________________________________________________

3. AC+DC current Arms (true rms)

Range

(Accuracy Range)

200 A (10.0 to 200.0 A) 0.1 A 1.3%rdg. 13dgt. 2.0%rdg. 7dgt.

(100 to 1800 A)

2000 A

(1800 to 2000 A) 2.3%rdg. 13dgt.

Resolution DC, 45 to 66Hz

1A

1.3%rdg. 13dgt. 2.0%rdg. 7dgt.

10 to 45,

66 to 1kHz

Measurement response (during a f.s. input):
Rise response time (0% to 90%) 250 ms or less
Fall response time (100% to 10%) 500 ms or less

Peak measurement accuracy (Peak hold function)
During continuous input of sine waves

1. DC current A peak (wave peak value)

Range

(Accuracy Range)

200 A (10 to 500 A)

(100 to 2300 A) 1.3%rdg. 7dgt.

2000 A

(2300 to 2840 A) 6.0%rdg. 7dgt.

Resolution DC

1.3%rdg. 7dgt.

1A

2. AC current A peak (wave peak value)

Range

(Accuracy Range)

200 A (10 to 500 A)

(100 to 2300 A) 1.3%rdg. 7dgt. 2.0%rdg. 7dgt.

2000 A

(2300 to 2840 A) 6.0%rdg. 7dgt.

Resolution 45 to 66Hz

1.3%rdg. 7dgt. 2.0%rdg. 7dgt.

1A

10 to 45,

66 to 1kHz

3. AC+DC current A peak (wave peak value)

Range

(Accuracy Range)

200 A (10 to 500 A)

(100 to 2300 A) 1.3%rdg. 7dgt. 2.0%rdg. 7dgt.

2000 A

(2300 to 2840 A) 6.0%rdg. 7dgt.

ResolutionDC, 45 to 66Hz

1.3%rdg. 7dgt. 2.0%rdg. 7dgt.

1A

_______________________________________________________

4.1 Measurement Specifications

10 to 45,

66 to 1kHz

Frequency measurement Hz

Display accuracy

Range

(Accuracy Range)

10 Hz (1.00 to 10.00 Hz) 0.01 Hz 0.3%rdg. 1dgt.
100 Hz (10.0 to 100.0 Hz) 0.1 Hz 0.3%rdg. 1dgt.
1000 Hz (100 to 1000 Hz) 1Hz 1.0%rdg. 1dgt.

Current Specifications
Maximum input

current
Effect of conductor

position
External magnetic

field interference
Maximum rated

voltage to earth

Resolution

2000 Arms continuous, 2840 Amax.
See Fig.3

within 0.7% (in any direction from
sensor center)

AC 400 A/m (external magnetic fields)
corresponds to 2 A or less (display)

max. 600 Vrms

51_______________________________________________________

Fig.3 Frequency-dependent deletion characteristics

_______________________________________________________

4.1 Measurement Specifications

52_______________________________________________________

4.1.2 Voltage Measurement Specifications

Voltage display accuracy

1. DC voltage V (mean value)

Range

(Accuracy Range)

30 V ( 3.00 to 30.00 V) 0.01 V 1.0%rdg. 3dgt.

300 V ( 30.0 to 300.0 V) 0.1 V 1.0%rdg. 3dgt.

600 V ( 60.0 to 600V) 1V 1.0%rdg. 3dgt.

2. AC voltage Vrms (true rms)

Range

(Accuracy Range)

30V (3.00～30.00V) 0.01V 1.0%rdg. 3dgt. 1.5%rdg. 5dgt.

300V (30.0～300.0V) 0.1V 1.0%rdg. 3dgt. 1.5%rdg. 5dgt.

600V (60.0～600V) 1V 1.0%rdg. 3dgt. 1.5%rdg. 5dgt.

3. AC+DC voltage Vrms (true rms)

Range

(Accuracy Range)

30 V (3.00 to 30.00 V) 0.01 V 1.0%rdg. 13dgt. 1.5%rdg. 13dgt.
300 V (30.0 to 300.0 V) 0.1 V 1.0%rdg. 7dgt. 1.5%rdg. 7dgt.

600 V (60.0 to 600 V) 1V 1.0%rdg. 7dgt. 1.5%rdg. 7dgt.

Peak measurement accuracy (Peak hold function)
During continuous input of sine waves

1. DC voltage V peak (wave peak value)

Range

(Accuracy Range)

30 V (3.0 to 75.0 V) 0.1 V 1.0%rdg. 7dgt.
300 V (30 to 750 V)

600 V (60 to 1000 V) 1.0%rdg. 7dgt.

Resolution DC

Resolution 45 to 66Hz

Resolution DC, 45 to 66Hz

Resolution DC

1V

1.0%rdg. 7dgt.

10 to 45,

66 to 1kHz

10 to 45,

66 to 1kHz

_______________________________________________________

4.1 Measurement Specifications

53_______________________________________________________

2. AC voltage V peak (wave peak value)

Range

(Accuracy Range)

30 V (3.0 to 75.0 V) 0.1 V 1.0%rdg. 7dgt. 1.5%rdg. 7dgt.
300 V (30 to 750 V)
600 V (60 to 700 V) 1.0%rdg. 7dgt. 1.5%rdg. 7dgt.

600 V (700 to 1000 V) 2.0%rdg. 20dgt. 2.5%rdg. 20dgt.

Resolution 45 to 66Hz

1.0%rdg. 7dgt. 1.5%rdg. 7dgt.

1V

10 to 45,

66 to 1kHz

3. AC+DC voltage V peak (wave peak value)

Range

(Accuracy Range)

30 V (3.0 to 75.0 V) 0.1 V 1.0%rdg. 7dgt. 1.5%rdg. 7dgt.
300 V (30 to 750 V)
600 V (60 to 700 V) 1.0%rdg. 7dgt. 1.5%rdg. 7dgt.

600 V (700 to 1000 V) 2.0%rdg. 20dgt. 2.5%rdg. 20dgt.

Resolution DC,45 to 66Hz

1.0%rdg. 7dgt. 1.5%rdg. 7dgt.

1V

10 to 45,

66 to 1kHz

Frequency measurement Hz

Display accuracy

Range

(Accuracy Range)

10Hz (1.00 to 10.00 Hz) 0.01 Hz 0.3%rdg. 1dgt.
100Hz (10.0 to 100.0 Hz) 0.1 Hz 0.3%rdg. 1dgt.
1000Hz (100 to 1000 Hz) 1Hz 1.0%rdg. 1dgt.

Voltage Specifications
Maximum input

voltage

Resolution

1000 V max.

_______________________________________________________

4.1 Measurement Specifications

54_______________________________________________________

4.1.3 Resistance Measurement Specifications

Range

(Accuracy Range)

1kΩ

(10 to 999Ω)

10 kΩ

(0.95 k～10.00 kΩ)

Resolution Accuracy

1 Ω

0.01 kΩ

4.1.4 ContinuityCheck

Range Resolution

1kΩ 1 Ω

Threshold

30 Ω 5 Ω

level

or less

1.5%rdg.
5dgt.

Overload

protection

600 Vrms

Overload

protection

600 Vrms

Open

terminal

voltage

3.1 VDC
or less

Open

terminal

voltage

3.1 VDC
or less

_______________________________________________________

4.1 Measurement Specifications

4.2 General Specifications

Accessory Functions:

Auto-zero adjustment
function

Zero cancel function

Recording

Data hold
Auto power-off

Beep tone

Pressing 0ADJ/RESET button once in
DCA, AC+DCA, or DCV mode.

Pressing 0ADJ/RESET button once
with holding HOLD
AC+DC mode.

Maximum (MAX), minimum (MIN),
average (AVE) value display selectable
for current, voltage and frequency
measurements

Data hold function
Automatic shutdown after 10.5 1

minutes. Beep tone warning before the
shutdown. Extending and disabling
possible.

ON/OFF

55_______________________________________________________

button in AC or

Display

Digital counter

Bar graph display
Over-range display
Battery low warning

_______________________________________________________

LCD panel
2500 counts max. (current)

But 2000 counts at 200 A range

3750 counts max. (voltage)

But 750 counts at 600 V range

1250 counts max. (frequency)

But 1000 counts at 1000 Hz range

1000 counts max. (Resistance)
35 segments
"O.L." (bar graph)

(When this mark is lighting, the

accuracy is not guaranteed.)

4.2 General Specifications

56_______________________________________________________

Data hold annunciator
Auto power-off

HOLD
APS

annunciator
Units
Zero suppression
Display update rate

A, V, Hz, Ω
5 counts
Digital counter

NORMAL approx. 2 times/second
SLOW approx. 1 time/3 seconds
FAST approx. 4 times/second

Bar graph
Display response

time
(the range is fixed,
0% to 100%)

Range switching

approx. 4 times/second
Current, Voltage: 1 s max.

Frequency:
1 s max. (1000 Hz, 100 Hz range)

2.5 s max. (10 Hz range)
Resistance, Continuity check: 1.1 s max.

Auto range, manual (fixed) range
(selectable). (except for resistance,
continuity check)

Circuit dynamic
characteristics

2.5 max. (1.42 for 2000 A range, 1.7 for
600 V range)

(crest factor)

Withstand voltage

Between the case and input terminals,
case and clamp cores AC 5400 Vrms /1
minute

Location for use
Applicable standards

Indoor, altitude up to 2000 m (6562-ft)
Safety:

EN61010
Voltage input: Pollution level 2,
measurement category III (expected
transient overvoltage: 6000 V)
EMC: EN61326

Dust resistance

EN60529 IP40

_______________________________________________________

4.2 General Specifications

Maximum conductor
diameter for
measurement

Operating
temperature and
humidity range

Temperature
characteristics

Storage temperature
range

Power source
Maximum power

consumption
Battery life
External dimensions

Mass

Accessories

φ55 mm max.

0to40 (32 to 104 ),
80%RH or less (no condensation)

In0to40 (32 to 104 ) range: 0.1
accuracy specifications/

-10to50 (14 to 122 ),
(no condensation)

One 6F22 (006P) 9 V battery
110 mVA

Approx. 20 hours (continuous, no load)
Approx. 62W 260H 39D mm

Approx. 2.44"W

10.24"H 1.54"D

Approx. 540 g
Approx. 19.0 oz.

L9207-10 Test Lead (red and black) 1
9345 Carrying Case 1
Hand Strap 1
Battery 6F22(006P) 1
Instruction manual 1

57_______________________________________________________

_______________________________________________________

4.2 General Specifications

58_______________________________________________________

_______________________________________________________

4.2 General Specifications

59_______________________________________________________

Chapter 5

Maintenance

and Service

5.1 Cleaning

To clean the instrument, wipe it gently with a soft cloth
moistened with water or mild detergent. Never use solvents
such as benzene, alcohol, acetone, ether, ketones, thinners
or gasoline, as they can deform and discolor the case.
Measurements are degraded by dirt on the mating surfaces
of the clamp-on sensor, so keep the surfaces clean by gently
wiping with a soft cloth.
To avoid corrosion from battery leakage, remove the batteries
from the instrument if it is to be stored for a long time.

5.2 After service

The minimum stocking period for replacement parts is five
years after end of production.
If damage is suspected, check the "5.3 Troubleshooting"
section before contacting your dealer or Hioki
representative.
When sending the instrument for repair, remove the
batteries and pack carefully to prevent damage in transit.
Include cushioning material so the instrument cannot move
within the package. Be sure to include details of the
problem. Hioki cannot be responsible for damage that
occurs during shipment.

_______________________________________________________

5.1 Cleaning

60_______________________________________________________

y

5.3 Troubleshooting

Before returning for repair

If the instrument seems not to be working normally,
check the following points first before requesting
service.

Symptom

Remed

Instrument does not
come on.

indication appears
and instrument
immediately turns
off.

indication
appears.

Instrument turns off
during use.*

Voltage and
resistance cannot be
measured.

If problem persists, request service.

* When APS (auto power-off) is effective, the

NOTE

instrument is automatically shut down when no

Battery

Replace

battery.

(See 2.1:

Preparations)

Yes Yes

Yes

Yes

Yes Yes

Battery clip

Check

connection

of battery to

clip.

Test leads

Check test

leads for

broken wire.

Yes

button is pressed for about 10 minutes. (See 3.5:
Automatically Turning Power Off (Auto Power-Off
Function

_______________________________________________________

5.3 Troubleshooting

APS

))

61_______________________________________________________

Other symptoms that may occur are as follows .

If no power is supplied:

Check that it has sufficient remaining power. (See 2.1.4:
Battery Low Warning (When

mark lights) )

The counter doesn't become zero:

In DCA, AC+DCA, or DCV mode

Use the auto-zero adjustment function (See 3.1.1).
(If this occures in AC+DCA mode after performing the
auto-zero-adjustment, perform the zero cancel correction
function.)

In ACA, ACV, or AC+DCV mode

Use the zero-cancel correction function (See 3.1.2).

Resistance measurement or continuity check

If 0 Ω is displayed when the red and black test leads are
unconnected (open-circuit), internal circuitry may be
damaged, requiring repair service.

The measured value is larger than the estimated
value.

Current / Voltage / Frequency measurement:

Check that you're using the proper range.
Examine the waveform to confirm that no components
but the estimated frequency are being used.
Check that the counter has been reset with

0ADJ/RESET

button before peak measurement.
Look for magnetic fields, electrical fields or possible
noise sources near the instrument.
Check the waveform. Some special frequencies can't be
measured, such as those of inverters. (At frequency
measurement)

_______________________________________________________

5.3 Troubleshooting

62_______________________________________________________

The measured value is smaller than the estimated
value.

Current / Voltage measurement:

Check that the clamp sensor is firmly closed. (At current
measurement)
Check that the test leads are fully connected. (At voltage
measurement)
Check that the frequency of the measured circuit is
within the range provided in the specifications. (A
smaller value will be displayed for a high inverter carrier
frequency.) *Items within parentheses apply to current
measurement only
Check that the proper steps have been taken, according to
procedure described in 3.1.1: Auto-zero adjustment
function and 3.1.2: Zero-cancel correction function.
Check that you're using the proper mode. (See 1.5:
Modes.)
Check that the peak value is below the circuit dynamic
value provided in the specifications. (To check
transitional peak values, see Notes in 2.2.4 and 2.3.4:
Peak Hold Measurement.)
Check that the crest factor (peak value / RMS value) is
below the circuit dynamic value provided in the
specifications.
Check that the battery warning annunciator is off.

Frequency measurement:

Check the waveform. Some special frequencies can't be
measured, such as those of inverters.
Check that the input value corresponds to 10% or more
of the range.

_______________________________________________________

5.3 Troubleshooting

The measured value fluctuates.

Check that the measured circuit is stable.
During voltage measurements, check that the test leads
are fully connected.
Check the waveform. Some special frequencies can't be
measured, such as those of inverters.

The displayed value is out of range O.L.

Resistance measurement or continuity check

If O.L. is displayed when the test leads are shorted
together, a test lead may be broken or internal circuitry
may be damaged.
Check for broken test leads by taking a voltage
measurement. If a test lead is broken, replace with
Model L9207-10 Test Lead.

Current measurment

o If nothing can be measured (no input detected) the
sensor element or internal circuitry may be damaged,
requiring repair service. If the damage is to internal
circuitry, the displayed value may appear over range
O.L. during voltage measurement.

Voltage measurement

If over range is indicated when nothing is being
measured, internal circuitry may be damaged.

63_______________________________________________________

_______________________________________________________

5.3 Troubleshooting

64_______________________________________________________

5.4 Error Message

Repair is required if E.001 to E.004 is indicated on
the counter, when power is turned on.

Error No. Symptom Remedy

E001

E002

E003
E004

Checksum error in
single-chip
microcontroller
internal ROM

Checksum error in
single-chip
microcontroller
internal RAMR/W

Checksum error in
EEPROM

EEPROM data error

Component
replacement required.
Please contact your
dealer or HIOKI
representative.

_______________________________________________________

5.4 Error Message