Introduction i
Shipping Check
Safety
Attentions During Use
ⅸ
ii
iii
Chapter 1Product 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 10
1.4.2 Voltage Measurements Mode
1.4.3 Frequency Measurements Mode
10
1.5 Modes 13
Chapter 2Measurement 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 25
2.3.1 Measuring DC Voltage (DC V) 25
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
1
2
3
11
12
17
18
20
21
26
27
28
Page 76
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
31
32
2.5 Auto-Zero-Adjustment/Zero-Cancel
Correction Function
2.5.1 Auto-Zero-Adjustment Function 34
2.5.2 Zero-Cancel Correction Function
34
35
2.6 Data Hold Function HOLD 35
2.7 Alteration of Counter Updates
2.7.1 SLOW mode 36
2.7.2 FAST mode
36
36
2.8 Recording Function REC 36
2.9 Auto Power-Off Function APS
2.10 Battery Low Warning
41
2.11 Beep Tone
40
41
Chapter 3Specifications 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 4Battery Replacement 53
Chapter 5AC Adapter (Optional)
Chapter 6Attaching The Hand Strap
Chapter 7Troubleshooting
Chapter 8Service
55
57
59
65
Page 77
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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.
i
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Introduction
Page 78
ii
―――――――――――――――――――――――――――
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
L9207-10 TEST LEAD (red and black) 1
Hand Strap 1
6F22 (006P) 1
Instruction manual 1
Options
9094 OUTPUT CORD
9445-02 AC ADAPTER
9445-03 AC ADAPTER (EU)
――――――――――――――――――――――――
Shipping Check
Page 79
―――――――――――――――――――――――――――
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 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.
――――――――――――――――――――――――
Safety
Page 80
iv
―――――――――――――――――――――――――――
The following symbols in this manual indicate the
relative importance of cautions and warnings.
Indicates that incorrect operation
DANGER
presents an extreme hazard that could
result in serious injury or death 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.
――――――――――――――――――――――――
Safety
Page 81
―――――――――――――――――――――――――――
Safety Symbols
Thesymbol printed on the instrument
indicates that the user should refer to a
corresponding topic in the manual (marked
with the
relevant function.
In the manual, the
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 that dangerous voltage may be
present at this terminal
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 ind icated or displayed by the
measuring instrument.
dgt. (resolution)
――――――――――――――――――――――――
symbol) before using the
symbol indicates
Safety
v
Page 82
vi
―――――――――――――――――――――――――――
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
Page 83
―――――――――――――――――――――――――――
vii
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 : 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.
CAT III : Pri mar y 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).
――――――――――――――――――――――――
Safety
Page 84
viii
―――――――――――――――――――――――――――
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.
――――――――――――――――――――――――
Safety
Page 85
―――――――――――――――――――――――――――
ix
Attentions During Use
In order to ensure safe operation and to obtain maximum
performance from the unit, observe the cautions listed below.
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 or 9445-03 (for
EU).
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.
――――――――――――――――――――――――
Attentions During Use
Page 86
x
―――――――――――――――――――――――――――
WARNING
.
・
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.
・
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.
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Attentions During Use
Page 87
―――――――――――――――――――――――――――
xi
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.
・
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 .
――――――――――――――――――――――――
Attentions During Use
Page 88
xii
―――――――――――――――――――――――――――
CAUTION
・
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.
・
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.
――――――――――――――――――――――――
Attentions During Use
Page 89
―――――――――――――――――――――――――――
xiii
・
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.
・
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.
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Attentions During Use
Page 90
xiv
―――――――――――――――――――――――――――
・
NOTE
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 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.
――――――――――――――――――――――――
Attentions During Use
Page 91
―――――――――――――――――――――――――――
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
are equipped so that you are able to measure by
connecting to other instruments such as recorders.
1
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Chapter 1 Product Outline
Page 92
2
―――――――――――――――――――――――――――
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
Page 93
―――――――――――――――――――――――――――
1.3 Parts and Functions
TopandSideView
⑩
3
⑰
①②
⑪
⑱
③④
⑤⑥
⑨
⑧⑦⑫⑭⑯
⑬⑮
――――――――――――――――――――――――
Chapter 1 Product Outline
Page 94
4
A
―――――――――――――――――――――――――――
POWER
①
・
Used to turn power on/off
・
To disable the auto power-off function, hold
key
POWER
DC
A
, when you turn power on.
AC+DC
AC
A
A
and press
②
・
Switches current modes as follow.
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 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.
HOLD
④
・
Used to suspend or inactivate the screen-updating
function.
・
To disable the auto power-off function when
powering on, hold
OUTPUT
⑤
・
Allows voltage output during current measurement or
HOLD
and press
POWER
frequency measurement in a current mode.
・
The auto power-off function is inactivated.
REC
(Record output)
(Auto power-off inactive)
(Except for DC A)
・
You can find how much the battery power remains
on the bar graph, when you press
MON
(Waveform output)
(Auto power-off inactive)
Light turned off
(Auto power-off active)
PS
annunciator is on.
OUTPUT
current mode.
――――――――――――――――――――――――
Chapter 1 Product Outline
HOLD
.
in a
Page 95
―――――――――――――――――――――――――――
A
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 "
FAST
".
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.
5
DC VAC+DC V
MAX/MIN
⑧
・
Displays the maximum value (MAX), the minimum
CV
value (MIN), or the average value (AVE) of the
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 o f the maximum
and minimum measured values after the REC
function is activated.
・
The auto power-off function is disabled in the REC
function.
――――――――――――――――――――――――
Chapter 1 Product Outline
Page 96
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 lever⑪. 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.
――――――――――――――――――――――――
Chapter 1 Product Outline
Page 97
―――――――――――――――――――――――――――
⑫
Display (LCD)
Direct Current (DC)
Alternating Current (AC)
Alternating Current and Direct Current
(AC+DC)
ADJ
Auto-zero-adjustment or zero-cancel
correction function is active
Battery low warning
HOLD
Data hold function
MON
Waveform output (AC) is active
REC
Recording output (DC) is active
APS
Auto power off function
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
――――――――――――――――――――――――
Chapter 1 Product Outline
7
Page 98
8
―――――――――――――――――――――――――――
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 L9207-10 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.
――――――――――――――――――――――――
Chapter 1 Product Outline
Page 99
―――――――――――――――――――――――――――
L9207-10 TEST LEAD
2
1
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 CATII
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
Attaching 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.
Insert the metal pins of the test leads into
the holes of the sleeves, and firmly push
them all the way in.
Chapter 1 Product Outline
9
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10
―――――――――――――――――――――――――――
1.4 Flowchart of Key Operations
1.4.1 Current Measurements Mode
key
RANGE key
SLOW/PEAK/
Hz key
DC AAC+DC AAC A
AUTO range
20.00 A range
200.0 A range
SLOW
FAST
PEAK
NORMAL
AUTO range
20.00 A range
200.0 A range
SLOW
FAST
PEAK
Hz
NORMAL
AUTO range
20.00 A range
200.0 A range
SLOW
FAST
PEAK
Hz
NORMAL
MAX/MIN key
OUTPUT key
0ADJ/RESET
key
HOLD+0ADJ/
RESET key
MAX
MIN
AVE
Instantaneous
value
OFF
MON
Auto-zeroadjustment
Disabledzero-cancel
MAX
MIN
AVE
Instantaneous
value
OFF
REC
MON
Disabled
correction
MAX
MIN
AVE
Instantaneous
value
OFF
REC
MON
Auto-zeroadjustment
zero-cancel
correction
* Neither "FAST" or "NORMAL" annunciator is on
the display.
――――――――――――――――――――――――
Chapter 1 Product Outline
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