Hioki 3285 Instruction Manual

3285

CLAMP ON

AC/DC HiTESTER

INSTRUCTION MANUAL

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Contents

Introduction i
Shipping Check
Safety
Attentions During Use
Organization of This Manual

viii

xii

ii

iii

Chapter 1 Product Outline

1.1 Product Outline 1

1.2 Features

1.3 Parts and Functions

1.4 Flowchart of Key Operations

1.4.1 Current Measurements Mode 9

1.4.2 Voltage Measurements Mode

1.4.3 Frequency Measurements Mode

10
11

1.5 Modes 12

Chapter 2 Measurement Procedure 15

2.1 Preparations 15

2.2 Current Measurement

2.2.1 Measuring DC Current (DC A) 16

2.2.2 Measuring AC Current (AC A)

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

2.2.4 Peak Hold Measurement

2.2.5 Output Function

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

16

17
18
20
21

27
28
29

1

2
3
9

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2.4 Frequency Measurement 30

2.4.1 Frequency Measurement in Current Mode 30

2.4.2 Frequency Measurement in Voltage Mode

2.4.3 Output Function For Frequency

2.5 Auto-Zero-Adjustment/Zero-Cancel
Correction Function

2.5.1 Auto-Zero-Adjustment Function 34

2.5.2 Zero-Cancel Correction Function

2.6 Data Hold Function HOLD 35

2.7 Alteration of Counter Updates

2.7.1 SLOW mode 36

2.7.2 FAST mode

2.8 Recording Function REC 37

2.9 Auto Power-Off Function APS

2.10 Battery Low Warning

2.11 Beep Tone

41

31
32

34

35

36

36

40

41

Chapter 3 Specifications 43

3.1 Measurement Specifications 43

3.1.1 Current Measurement Specifications 43

3.1.2 Voltage Measurement Specifications

3.2 General Specifications 49

48

Chapter 4 Battery Replacement 53

Chapter 5 AC Adapter (Optional)

Chapter 6 Attaching The Hand Strap

Chapter 7 Troubleshooting

Chapter 8 Service

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55

57

59

65

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Introduction

Thank you for purchasing the HIOKI "3285 CLAMP
ON AC/DC HiTESTER." To obtain maximum
performance from the instrument/ device/ product,
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

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Introduction

ii

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Shipping Check

When the unit is delivered, check and make sure
that it has not been damaged in transit. In
particular, check the accessories, panel switches,
keys, and terminals.

If the unit is damaged, or fails to operate according
to the specifications, contact your dealer or HIOKI
representative.

Check the 3285 Unit and the Supplied
Accessories

Main unit

3285 CLAMP ON AC/DC HiTESTER

Supplied accessories

9345 CARRYING CASE 1
9207-10 TEST LEAD (red and black) 1
Hand Strap 1
6F22(006P) 1
Instruction manual 1

Options

9094 OUTPUT CORD
9445-02 AC ADAPTER

(SA10-0910N, SINO-AMERICAN)

9445-03 AC ADAPTER (EU)

(SA10-0910G, SINO-AMERICAN)

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Shipping Check

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iii

Safety

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.

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Safety

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

Indicates that incorrect operation

DANGER

presents extreme danger of accident
resulting in death or serious injury to the
user.　
Indicates that incorrect operation

WARNING

presents 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.

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Safety

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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 symbol indicates
particularly important information that the
user should read before using the instrument.
Indicates AC (Alternating Current).
Indicates DC (Direct Current).
Indicates both DC (Direct Current) and AC
(Alternating Current).
Indicates a device which is double­insulated.
Indicates that the instrument may be connected
to or disconnected from a live circuit.

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

Signifies the maximum display (scale) value or the
length of the scale (in cases where the scale consists
of unequal increments or where the maximum value
cannot be defined).
In general, this is the range value (the value written
on the range selector or equivalent) currently in use.

rdg. (displayed or indicated value)

Signifies the value actually being measured, i.e., the
value that is currently indicated or displayed by the
measuring instrument.

dgt. (resolution)

Signifies the smallest display unit on a digital
measuring instrument, i.e., the value displayed when
the last digit on the digital display is "1".

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Safety

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Measurement categories (Overvoltage
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 I to CAT IV, and called measurement
categories. These are defined as follows.

CAT I : Secondary electrical circuits connected to

an AC electrical outlet through a
transformer or similar device.

CAT II : Primary electrical circuits in equipment

connected to an AC electrical outlet by a
power cord (portable tools, household
appliances, etc.)

CAT III : Primary electrical circuits of heavy

equipment (fixed installations) connected
directly to the distribution panel, and
feeders from the distribution panel to
outlets.

CAT IV : The circui t from the service drop to the

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

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Safety

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Higher-numbered categories correspond to electrical
environments with greater momentary energy. So a
measurement device designed for CAT III
environments can endure greater momentary energy
thanadevicedesignedforCATII.
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.
Never use a CAT I measuring instrument in CAT II,
III, or IV environments.
The measurement categories comply with the
Overvoltage Categories of the IEC60664 Standards.

vii

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Safety

viii

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Attentions During Use

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

DANGER

･ Use clamp testers only on power lines up to 600

Vrms, to avoid short-circuits and accidents that
could result in injury or death.

･ Always connect the clamp sensor to the

secondary side of a breaker. On the secondary
side of a breaker, even if the lines are shorted
the breaker can trip and prevent an accident.
On the primary side, however, the current
capacity may be large, and in the event of a
short-circuits there may be a serious accident.

･ When using an AC adapter, use only the

specified HIOKI model 9445-02 (SA10-0910N,
SINO-AMERICAN) or 9445-03 (for EU) (SA10­0910G, SINO-AMERICAN).

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Attentions During Use

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WARNING

･ To avoid electric shock, do not allow the

product to get wet, and do not use it when your
hands are wet.

･ 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 to the product.

･ Do not input voltage exceeding 600 Vrms (1000

V max.).

･ To avoid electric shock when replacing the

batteries, first disconnect the clamp portion
from the object to be measured. Also, before
using the product after replacing the batteries,
replace the cover and screw.

･ When replacing the batteries, be sure to insert

them with the correct polarity. Otherwise, poor
performance or damage from battery leakage
could result.

･ To avoid the possibility of explosion, do not short

circuit, disassemble or incinerate batteries.

･ Handle and dispose of batteries in accordance

with local regulations.

･Do not use the instrument where it may be exposed

to corrosive or combustible gases. The instrument
may be damaged or cause an explosion.

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Attentions During Use

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CAUTION

･ This is a precision instrument: do not clamp any

foreign objects in the end of the clamp core, or
insert anything in the core gap.

･ To avoid damage to the product, protect it from

vibration or shock during transport and handling,
and be especially careful to avoid dropping. Do not
exert excessive pressure on the clamp sensor or
attempt to wedge the sensor into a tight spot for
measurement.

･ Before using the product 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.

･ To avoid damage to the product, do not exceed the

maximum input current rating, which depends on
the frequency of the current being measured (see
Fig.4 of Chapter 3) Be careful about the evolution
of heat, when the input frequency is high.

･ Do not use the product if the battery is exhausted

(when the
sure to replace the exhausted battery with a new
one.

･ 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.

･ Adjustments and repairs should be made only by

technically qualified personnel.

mark lights in the display area). Be

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Attentions During Use

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CAUTION

･ For the inside memory protection, make sure the

power is turned off before plugging in or unplugging
the AC adapter.

･ This product is designed for indoor use, and operates

reliably from 0

･ Do not store or use the product where it could be

exposed to direct sunlight, high temperature or
humidity, or condensation. Under such conditions,
the product may be damaged and insulation may
deteriorate so that it no longer meets specifications.

･ Accurate measurement may be impossible in

NOTE

locations subject to strong external magnetic fields,
such as transformers and high-current conductors, or
in locations subject to strong external electric fields,
such as radio transmission equipment.

･ Gently wipe dirt from the surface of the unit with a

soft cloth moistened with a small amount of water
or mild detergent.
Do not try to clean the unit using cleaners
containing organic solvents such as benzine, alcohol,
acetone, ether, ketones, thinners, or gasoline. They
may cause discoloration or damage.

･ When not in use for a long time, to prevent possible

corrosion caused by battery leakage, remove the
batteries before storage.

to 40 .

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Attentions During Use

xii

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Organization of This Manual

Chapter 1
Product Outline

Explains the parts and functions of the unit.

Chapter 2
Measurement Procedure

Explains how to use the 3285 for measurement.

Chapter 3
Specifications

Lists the specifications of the 3285 CLAMP ON
AC/DC HiTESTER.

Chapter 4
Battery Replacement

Explains how to replace the battery used to power
the 3285.

Chapter 5
AC Adapter (Optional)

Explains how to use the AC adapter.

Chapter 6
Attaching the Hand Strap

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

Chapter 7
Troubleshooting

Describes how to check before requesting service.

Chapter 8
Service

Explains how to get the unit serviced.

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Organization of This Manual

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Chapter 1

Product Outline

1.1 Product Outline

The 3285 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. Using a one-chip microprocessor, the
tester provides many functions, including an
automatic zero adjust function that changes a
troublesome task into a one-touch operation. An AC
adapter connection terminal and an output terminal
areequippedsothatyouareabletomeasureby
connecting to other instruments such as recorders.

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Chapter 1 Product Outline

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1.2 Features

･ A multi-function microcomputer

The built-in microcomputer offers various functions
in a compact form.

･ Display of true rms values

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

･ Measurement for AC/DC

The unit permits measurement of AC superimposed
on DC, as well as measurement of half- and full­wave 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.

･ Output terminal

You can record current or frequency by connecting
a recorder or an oscilloscope to the built-in output
terminal.

Current (Record output: REC, Waveform output:

MON)

Frequency (Record output: REC)

･ Dual-power source

The unit operates on either a battery power or an
AC power source.

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Chapter 1 Product Outline

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1.3 Parts and Functions

Top and Side View

⑩

3

⑰

①
②

⑪

⑱

③
④

⑤
⑥

⑨
⑧
⑦
⑫
⑭
⑯

⑬
⑮

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Chapter 1 Product Outline

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①

POWER

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

and press

②

POWER

key

, when you turn power on.

HOLD

･ Switches current modes as follow.

DCＡ AC+DCＡACＡ

RANGE

③

･ 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.

④

HOLD

･ Used to suspend or inactivate the screen-updating

function.

･ To disable the auto power-off function when

powering on, hold

⑤

OUTPUT

HOLD

and press

POWER

.

･ Allows voltage output during current measurement or

frequency measurement in a current mode.

･ The auto power-off function is inactivated.

REC

(Record output)

(Auto power-off inactive)

(Except for DC A)

MON

(Waveform output)

(Auto power-off inactive)

Light turned off

(Auto power-off active)

APS

annunciator is on.

･ You can find how much the battery power remains

on the bar graph, when you press

OUTPUT

in a

current mode.

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SLOW/PEAK/Hz

⑥

･ SLOW slows down screen updating (once per three

seconds).

･ FAST speeds up screen updating (four times per

".

second). There isn't an annunciator "
Instead, the unit symbol blinks.

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

⑦

･ Switches voltage modes as follows.

DC V AC+DC VAC V

MAX/MIN

⑧

･ Displays the maximum value (MAX), the minimum

value (MIN), or the average value (AVE)ofthe
maximum and minimum values for the recording
(REC) function.

･ MAX displays 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 in the REC

function.

FAST

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Chapter 1 Product Outline

6

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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

, then press

HOLD

cancel correction.

⑩ Clamp sensor

･ To measure current, open the top ends of the clamp

sensor by gripping the lever ⑪. Then position the
conductor to be measured at the center of the clamp
sensor and firmly close the clamp sensor.

⑪ Lever

･ Used to open and close the clamp sensor.

0ADJ/RESET

to perform a zero-

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Chapter 1 Product Outline

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⑫ Display (LCD)

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

(AC+DC)

Auto-zero-adjustment or zero-cancel

ADJ

correction function is active

Battery low warning

Data hold function

HOLD

Waveform output (AC) is active

MON

Recording output (DC) is active

REC

Auto power off function

APS

AUTO Auto-range
SLOW Counter update once every 3 seconds
REC Record function

MAX Maximum value
MIN Minimum value

AVE Average value = (MAX + MIN)/2
Hz Frequency
V Voltage
PEAK Wave peak value
RMS True root mean square value

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Chapter 1 Product Outline

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A Current
hour 1 hour/segment (bar graph)
min 1 minute/segment (bar graph)

Input over (bar graph)

⑬ Output terminal

Connected to the optional 9094 OUTPUT CORD to
provide output during a current measurement or a
frequency measurement in a current mode.

⑭ AC adapter connection terminal

Connected to the optional 9445-02 or 9445-03 AC
ADAPTER to perform measurements for no battery
or a long term measurement.

⑮ Voltage measurement terminal (V and COM

terminals)

Connected to the 9207-10 TEST LEAD (red and
black, supplied with the unit) to measure voltage.

⑯ Slide knob

Slide up to use the voltage measurement terminal or
slide down to use the output terminal or AC adapter
connection terminal. Move until a click is heard.

⑰ Back case

To replace the battery, remove the two screws.

⑱ Hand strap

Attach to get a better grip on the unit.

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Chapter 1 Product Outline

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1.4 Flowchart of Key Operations

1.4.1 Current Measurements Mode

key

RANGE key

SLOW/PEAK/
Hz key

DC A AC+DC AAC A

AUTO range

200.0 A range

2000 A range

SLOW

FAST

PEAK

NORMAL

AUTO range

200.0 A range

2000 A range

SLOW

FAST

PEAK

Hz

NORMAL

AUTO range

200.0 A range

2000 A range

SLOW

FAST

PEAK

Hz

NORMAL

9

MAX/MIN key

OUTPUT key

0ADJ/RESET
key

HOLD+0ADJ/
RESET key

MAX

MIN

AVE

Instantaneous
value

OFF

MON

Auto-zero­adjustment

Disabled zero-cancel

MAX

MIN

AVE

Instantaneous
value

OFF

REC

MON

Disabled Auto-zero-

correction

MAX

MIN

AVE

Instantaneous
value

OFF

REC

MON

adjustment

zero-cancel
correction

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

the display.

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Chapter 1 Product Outline

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