Hioki 3284 HiTester User manual

3284
CLAMP ON
AC/DC HiTESTER
INSTRUCTION MANUAL

Contents
Introduction i
Shipping Check ii
Safety iii
Attentions During Use viii
Organization of This Manual xii
Chapter 1 Product Outline 1
1.1 Product Outline 1
1.2 Features 2
1.3 Parts and Functions 3
1.4 Flowchart of Key Operations 9
1.4.1 Current Measurements Mode 9
1.4.2 Voltage Measurements Mode 10
1.4.3 Frequency Measurements Mode 11
1.5 Modes 12
Chapter 2 Measurement Procedure 15
2.1 Preparations 15
2.2 Current Measurement 16
2.2.1 Measuring DC Current (DC A) 16
2.2.2 Measuring AC Current (AC A) 17
2.2.3 Measuring AC/DC Current (AC+DC A) 18
2.2.4 Peak Hold Measurement 20
2.2.5 Output Function 21
2.3 Voltage Measurement 26
2.3.1 Measuring DC Voltage (DC V) 26
2.3.2 Measuring AC Voltage (AC V) 27
2.3.3 Measuring AC/DC Voltage (AC+DC V) 28
2.3.4 Peak Hold Measurement 29

2.4 Frequency Measurement 30
2.4.1 Frequency Measurement in Current Mode 30
2.4.2 Frequency Measurement in Voltage Mode 31
2.4.3 Output Function For Frequency 32
2.5 Auto-Zero-Adjustment/Zero-Cancel
Correction Function 34
2.5.1 Auto-Zero-Adjustment Function 34
2.5.2 Zero-Cancel Correction Function 35
2.6 Data Hold Function HOLD 35
2.7 Alteration of Counter Updates 36
2.7.1 SLOW mode 36
2.7.2 FAST mode 36
2.8 Recording Function REC 36
2.9 Auto Power-Off Function APS 40
2.10 Battery Low Warning 41
2.11 Beep Tone 41
Chapter 3 Specifications 43
3.1 Measurement Specifications 43
3.1.1 Current Measurement Specifications 43
3.1.2 Voltage Measurement Specifications 48
3.2 General Specifications 50
Chapter 4 Battery Replacement 53
Chapter 5 AC Adapter (Optional) 55
Chapter 6 Attaching The Hand Strap 57
Chapter 7 Troubleshooting 59
Chapter 8 Service 65

i
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Introduction
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Introduction
Thank you for purchasing the HIOKI "3284 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.

ii
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Shipping Check
――――――――――――――――――――――――
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 3284 Unit and the Supplied
Accessories
Main unit
3284 CLAMP ON AC/DC HiTESTER
Supplied accessories
9399 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)

iii
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Safety
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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.
Safety
This Instruction Manual provides information and
warnings essential for operating this unit in a safe
manner and for maintaining it in safe operating
condition. Before using this unit, be sure to
carefully read the following safety notes.

iv
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Safety
――――――――――――――――――――――――
DANGER
Indicates that incorrect operation
presents an extreme hazard that could
result in serious injury or death to the
user.
WARNING
Indicates that incorrect operation
presents a significant hazard that could
result in serious injury or death to the
user.
CAUTION
Indicates that incorrect operation
presents a possibility of injury to the user
or damage to the instrument.
NOTE
Indicates advisory items related to
performance or correct operation of the
instrument.
The following symbols in this manual indicate the
relative importance of cautions and warnings.

v
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Safety
――――――――――――――――――――――――
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 double-
insulated.
Indicates that the instrument may be connected
to or disconnected from a live circuit.
Safety Symbols
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".

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

vii
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Safety
――――――――――――――――――――――――
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.

viii
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Attentions During Use
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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) (SA10-
0910G, SINO-AMERICAN).
Attentions During Use
In order to ensure safe operation and to obtain
maximum performance from the unit, observe the
cautions listed below.

ix
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Attentions During Use
――――――――――――――――――――――――
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.

x
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Attentions During Use
――――――――――――――――――――――――
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) 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 mark lights in the display area). Be
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.

xi
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Attentions During Use
――――――――――――――――――――――――
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 to 40 .
･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.
NOTE ･Accurate measurement may be impossible in
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.

xii
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Organization of This Manual
――――――――――――――――――――――――
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 3284 for measurement.
Chapter 3
Specifications
Lists the specifications of the 3284 CLAMP ON
AC/DC HiTESTER.
Chapter 4
Battery Replacement
Explains how to replace the battery used to power
the 3284.
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.

1
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Chapter 1 Product Outline
――――――――――――――――――――――――
Chapter 1
Product Outline
1.1 Product Outline
The 3284 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.

2
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Chapter 1 Product Outline
――――――――――――――――――――――――
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 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.
･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.

3
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Chapter 1 Product Outline
――――――――――――――――――――――――
Top and Side View
①
②
③
④
⑤
⑥
⑦
⑨
⑧
⑫
⑭
⑬
⑮
⑯
⑩
⑪
⑰
⑱
1.3 Parts and Functions

4
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Chapter 1 Product Outline
――――――――――――――――――――――――
DCＡAC+DCＡACＡ
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.
①POWER
･Used to turn power on/off
･To disable the auto power-off function, hold HOLD
and press POWER , when you turn power on.
②key
･Switches current modes as follow.
③RANGE
･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 20 A and 200 A. The
voltage ranges are 30 V, 300 V and 600 V. The
frequency ranges are 10 Hz, 100 Hz and 1000 Hz.
④HOLD
･Used to suspend or inactivate the screen-updating
function.
･To disable the auto power-off function when
powering on, hold HOLD and press POWER .
⑤OUTPUT
･Allows voltage output during current measurement or
frequency measurement in a current mode.
･The auto power-off function is inactivated.
･You can find how much the battery power remains
on the bar graph, when you press OUTPUT in a
current mode.