Introduction i
Inspection i
Safety Notes ii
Notes on Use v
Chapter 1 Names and Functions
of parts 1
Chapter 2 Measurement Procedures 7
2.1 Voltage Measurement 8
2.2 Frequency Measurement
2.3 Duty Factor Measurement
2.4 Current Measurement
2.5 Resistance Measurement
2.6 Continuity Checking
2.7 Diode Check
2.8 HOLD.Auto Function
2.9 Overvoltage warning function
2.10 Relative (Relative display) function
2.11 Auto Power Save Function
Chapter 3 Specifications 25
3.1 General Specifications 25
3.2 Accuracy Chart
11
13
16
17
18
19
21
22
24
28
9
Page 44
Chapter 4 Maintenance and Service 31
4.1 Changing the Batteries and Fuses 31
4.2 Service
4.3 Cleaning
33
33
Page 45
―――――――――――――――――――――――――――
I
I
ntroduction
Thank you for purchasing this HIOKI "3257
DIGITAL HiTESTER." To get the maximum
performance from the unit, please read this
manual first, and keep this at hand.
nspection
When the unit is delivered, check and make
sure that it has not been damaged in transit.
If the unit is damaged, or fails to operate
according to the specifications, contact your
dealer or HIOKI representative.
Accessories
9170 TEST LEADS 1
9378 CARRYING CASE 1
Instruction Manual 1
R03 manganese battery 2
(built into this unit)
i
――――――――――――――――――――――――
Introduction
Page 46
ii
G
S
―――――――――――――――――――――――――――
afety Notes
WARNIN
This equipment is designed to according to
IEC 61010-1 Safety Standards, and has been
tested for safety prior to shipment. During high
voltage measurement, incorrect measurement
procedures could result in injury or death, as well
as damage to the equipment. Please read this
manual carefully and be sure that you understand
its contents before using the equipment. The
manufacturer disclaims all responsibility for any
accident or injury except that resulting due to
defect in its product.
――――――――――――――――――――――――
Safety Notes
Page 47
―――――――――――――――――――――――――――
iii
This Instruction Manual provides information
and warnings essential for operating this
equipment in a safe manner and for
maintaining it in safe operating condition.
Before using this equipment, be sure to
carefully read the following safety notes.
Safety symbols
・ This symbol is affixed to locations on the
unit where the operator should consult
corresponding topics in this manual (which
are also marked with the
symbol)
before using relevant functions of the unit.
・ In the manual, this mark indicates
explanations which it is particularly
important that the user read before using
the unit.
Indicates a device which is doubleinsulated.
Indicates DC (Direct Current).
Indicates AC (Alternating Current).
Indicates both DC and AC.
Indicates grounding terminal.
Indicates that this terminal carries voltage
at dangerous levels.
――――――――――――――――――――――――
Safety Notes
Page 48
iv
R
G
N
―――――――――――――――――――――――――――
The following symbols are used in this
Instruction Manual to indicate the relative
importance of cautions and warnings.
Indicates that incorrect operation
DANGE
presents extreme danger of accident
resulting in death or serious injury to
the user.
Indicates that incorrect operation
WARNIN
presents significant danger of accident
resulting in death or serious injury to
the user.
Indicates that incorrect operation
CAUTIO
presents possibility of injury to the user
or damage to the equipment.
Denotes items of advice related to
NOTE
performance of the equipment or to its
correct operation.
――――――――――――――――――――――――
Safety Notes
Page 49
―――――――――――――――――――――――――――
N
otes on Use
In order to ensure safe operation and to
obtain maximum performance from the unit,
observe the cautions listed below.
DANGER
Before taking a measurement, check the
position of the function switch. Do not measure
voltage outside the set voltage range. Doing so
may damage the unit or cause an accident that
might result in injury or death. When changing
the function switch, disconnect the test leads
from the object to be measured.
Do not input voltage to the resistance
measurement, continuity checking, diode
checking, capacitor functions. Doing so may
damage the unit or cause an accident resulting
in injury or death.
v
――――――――――――――――――――――――
Notes on Use
Page 50
vi
G
―――――――――――――――――――――――――――
WARNIN
To prevent electric shock, do not allow the unit
to become wet and do not use the unit when
your hands are wet.
Do not attempt to adjust or repair the unit with
the case open and with voltage being generated
and input. Such adjustments or repairs should
only be made by a technician who fully
understands the dangers involved.
If the unit is connected to a line that is to be
measured, dangerous voltage levels may be
applied to the terminals, and removing the case
may expose live components. When opening
the case to replace the batteries, etc., the test
leads must be detached.
If the protective functions of the unit are
damaged, either remove the unit from service or
post warnings to prevent others from using the
unit inadvertently.
――――――――――――――――――――――――
Notes on Use
Page 51
―――――――――――――――――――――――――――
N
CAUTIO
vii
・ Do not store or use the unit where it will be
exposed to direct sunlight, high temperatures, high
humidity, or condensation. If exposed to such
conditions, the unit may be damaged, the insulation
may deteriorate, and the unit may no longer satisfy
its specifications.
・ This unit is not constructed to be waterproof or
dustproof, so do not use it in a very dusty
environment or in one where it will get wet.
・ Before using the unit, make sure that the sheathing
on the probes is not damaged and that no bare wire
is exposed. If there is damage, using the unit could
cause electric shock. Replace the probe with the
specified 9170.
・ For safety reasons, only use the 9170 TEST
LEADS provided with the unit for measurement.
――――――――――――――――――――――――
Notes on Use
Page 52
viii
―――――――――――――――――――――――――――
――――――――――――――――――――――――
Notes on Use
Page 53
―――――――――――――――――――――――――――
Function Switch
LCD Display
REL key
RANGE Key
V,ΩTerminal
SHIFT/H.AUTO Key
COM Terminal
A, mA Terminal
A Terminal
1
d
ts
Chapter
Names an
Functions of par
1
μ
――――――――――――――――――――――――
Chapter 1 Names and Functions of parts
Page 54
2
V, Hz//
y
V, Hz//
,
,
,
―――――――――――――――――――――――――――
Function Switch
Selects functions, and turns the unit on and
off.
AC voltage, Frequency and Dut
factor
VDC voltage
ΩResistance
,Continuity check/Diode check
/50μA50μA DC /AC
/μA500μA, 5000μA DC /AC
/mA50 mA, 500 mA DC /AC
/A10 A DC /AC
SHIFT / H.AUTO Key
With theV, Hz, Duty factor
function, switches the AC voltage
frequency and duty factor
measurement.
,With the function, switches
between continuity checking and
diode checking.
/50μAWith the/ 50 μA function,
switches between DC and AC.
/μAWith the/μA function
switches between DC and AC.
/mAWith the/mA function
switches between DC and AC.
――――――――――――――――――――――――
Chapter 1 Names and Functions of parts
Page 55
―――――――――――――――――――――――――――
,
/AWith the/〜 A function
switches between DC and AC.
・ Disables the Auto Power Save function. (See
"Auto Power Save")
・ Starts and disables the HOLD.Auto function.
(See "HOLD.Auto Function")
RANGE Key
・ Switches between Auto Range and Manual
Range.
・ Changes range in the Manual Range mode.
・ With Hz function, changes Attenuator Range.
・ Each time the RANGE key is pressed, the
attenuator range goes up one range higher.
REL Key
・ Starts and disables the Relative (Relative
display) function. (See "Relative Function")
V, Ω Terminal
・ Use this terminal for voltage and resistance
functions.
3
COM Terminal
・ Common terminal for each function. (Please
connect the black test lead)
μA, mA Terminal
・ Use this terminal for μA and mA functions.
――――――――――――――――――――――――
Chapter 1 Names and Functions of parts
Page 56
4
,
,
―――――――――――――――――――――――――――
A Terminal
・ Use this terminal for A functions.
NOTE
A shutter of the terminal moves together with
the function switch to avoid misoperation.
When operating the function switch leaving
the test lead connected to the terminal, there
is a risk of damage to the 3257.
LCD Display
・Decimal point
Lights during VDC, 50 μADC, μADC
mADC and ADC measurement.
Lights during VAC, 50 μAAC, μAAC
mAAC and AAC measurement.
Lights during continuity checking
Lights during diode checking
AUTOLights during Auto Range operation
HOLDLights when setting HOLD.Auto
function
RELLights when setting Relative function
APSLights when the Auto Power Save
function is operating
Lights when the battery is below
assuring the voltage accuracy. (2.25 V
±0.15 V)
MkΩIndicates the units during resistance
measurement or continuity checking
――――――――――――――――――――――――
Chapter 1 Names and Functions of parts
Page 57
―――――――――――――――――――――――――――
mVIndicates the units during voltage
measurement or diode checking
μmAIndicates the units during current
measurement
Lights during duty factor
measurement (plus side slope)
Lights during duty factor
measurement (minus side slope)
%Indicates the unit during duty factor
measurement
Bar GraphScale display 56 dots bar graph
display (with polarity indication)
5
――――――――――――――――――――――――
Chapter 1 Names and Functions of parts
Page 58
6
―――――――――――――――――――――――――――
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Chapter 1 Names and Functions of parts
Page 59
―――――――――――――――――――――――――――
G
2
nt
s
Chapter
Measureme
Procedure
WARNIN
Even when the shutter is closed, there
insulating clearance around the terminals is not
safe. Be careful when connecting test leads.
The changing of the function switch when
replacing the test terminals requires
disconnection of the test leads from the item
being measured and then the disconnection of
the test leads from the terminals.
If the shutter is damaged, stop using the tester
and send it in for repairs
7
――――――――――――――――――――――――
Chapter 2 Measurement Procedures
Page 60
8
2
―――――――――――――――――――――――――――
.1 Voltage Measurement
DANGER
The maximum allowable input is 1000 VDC, 750
Vrms, or 107V・Hz. Do not measure voltage in
excess of these limitations, as doing so may
damage the unit or cause an accident that might
result in injury or death.
It is very dangerous to short two lines carrying
voltage with the tip of a test lead. Be very
careful when measuring voltage.
1. Set the function switch toV to measure an
AC voltage, or to V to measure a DC voltage.
Connect the red test lead to the V, Ω
terminal, and the black test lead to the COM
terminal.
2. Connect the test leads to the circuit to be
measured, and read the value from the
display.
3. For manual range operation, press the
RANGE key.
(The AUTO indication goes off.)
To return to the Auto Range mode, press the
RANGE key for at least 1 second.
――――――――――――――――――――――――
Chapter 2 Measurement Procedures
Page 61
―――――――――――――――――――――――――――
2
.2 Frequency Measurement
DANGER
9
The maximum allowable input is 1000 VDC, 750
Vrms, or 10
7
V・Hz. Do not measure voltage in
excess of these limitations, as doing so may
damage the unit or cause an accident that might
result in injury or death.
1. Set the function switch toV, then press the
SHIFT/H.AUTO key.
2. Press the RANGE key again as necessary to
step through the input attenuators.
3. Connect the red test lead to the V, Ω
Terminal, and the black test lead to the COM
Terminal.
4. Connect the test lead to the circuit to be
measured, and read the value from the
display.
――――――――――――――――――――――――
Chapter 2 Measurement Procedures
Page 62
10
)
)
―――――――――――――――――――――――――――
・ Select suitable attenuators referring to the
NOTE
following list. But only the Auto Range is
available for the frequency range.
・ For frequency measurement, the bar graph
gives the attenuator condition.
(Scale number in the bar graph is equivalent
to "n" of "1/10
The maximum allowable input is 1000 VDC, 750
Vrms, or 10
excess of these limitations, as doing so may
damage the unit or cause an accident that might
result in injury or death.
1. Set the function switch toV, then press the
2. Press the RANGE Key again as necessary to
3. Connect the red test lead to the V, Ω
4. Connect the test lead to the circuit to be
7
V・Hz. Do not measure voltage in
SHIFT/H.AUTO Key two times.
The duty factor indicator (
plus side slope measurement function starts.
When pressing the SHIFT/H.AUTO Key
again, the indicator (
side slope measurement function starts.
step through the input attenuators.
terminal, and the black test lead to the COM
terminal.
measured, and read the value from the
display. (When the value is below 5% or over
95%, "
----" is displayed.)
) lights and the
) lights and the minus
――――――――――――――――――――――――
Chapter 2 Measurement Procedures
Page 64
12
tTtw-tw
+
0V
―――――――――――――――――――――――――――
■ About Duty Factor measurement
Duty Factor shows the ratio between pulse
width and pulse period.
3257 displays this ratio by percentage. In the
square wave shown in the figure below, tw
+
and tw-are the pulse width (plus and minus
side slope, respectively) and T is the pulse
period.
+
D
is the duty factor of plus side slope, given
as following.
+
D
=tw+/T ×100(%)
Similarly, D
slope, given as following.
-
D
=tw-/T ×100(%)
-
is the duty factor of minus side
――――――――――――――――――――――――
Chapter 2 Measurement Procedures
Page 65
―――――――――――――――――――――――――――
2
13
.4 Current Measurement
DANGER
Do not use the tester to measure current when
the electric potential is 600 V or greater.
The current function overload protection trips at
either 600 VDC, 600 Vrms.
To prevent electrical accidents, turn the power
off before connecting the test leads and then
take measurements.
Do not input voltage.
■ 50 microamp Measurement
1. Set the function switch to 50 μA.
2. Connect the red test lead to the 50 μA
terminal, and the black to the COM terminal.
3. Use the SHIFT/H.AUTO key to select DC or
AC.
4. Connect the test leads to the circuit to be
measured, and read the value from the
display.
――――――――――――――――――――――――
Chapter 2 Measurement Procedures
Page 66
14
―――――――――――――――――――――――――――
■ Microamp Measurement (500 μA, 5000 μA,)
1. Set the function switch to μA.
2. Connect the red test lead to the μA terminal,
and the black to the COM terminal.
3. Use the SHIFT/H.AUTO key to select DC or
AC.
4. Connect the test leads to the circuit to be
measured, and read the value from the
display.
5. For manual operation, press the RANGE key.
(The AUTO indication goes off)
To return to the Auto Range mode, press and
hold the RANGE key for at least 1 second.
■ Milliamp Measurement (50 mA, 500 mA)
1. Set the function switch to mA.
2. Connect the red test lead to the mA terminal,
and the black to the COM terminal.
3. Use the SHIFT/H.AUTO key to select DC or
AC.
4. Connect the test leads to the circuit to be
measured, and read the value from the
display.
5. For manual operation, press the RANGE key.
(The AUTO indication goes off)
To return to the Auto Range mode, press and
hold the RANGE key for at least 1 second.
――――――――――――――――――――――――
Chapter 2 Measurement Procedures
Page 67
―――――――――――――――――――――――――――
G
15
■ Amp Measurement (10 A)
WARNIN
In the 10 A range, the maximum allowable input
is 10 A in both rms and DC.
In the 10 A range, the measuring time is
continuous up to 7 A, and one minute or less
from 7 A to 10 A.
1. Set the function switch to A.
2. Connect the red test lead to the A terminal,
and the black to the COM terminal.
3. Use the SHIFT/H.AUTO key to select DC or
AC.
4. Connect the test leads to the circuit to be
measured, and read the value from the
display.
――――――――――――――――――――――――
Chapter 2 Measurement Procedures
Page 68
16
2
―――――――――――――――――――――――――――
.5 Resistance Measurement
DANGER
Do not input voltage to the resistance
measurement function. Doing so may damage
the unit or cause an accident resulting in injury or
death.
1. Set the function switch to Ω.
2. Connect the red test lead to the V, Ω
terminal, and the black to the COM terminal.
3. Connect the test leads to the circuit to be
measured, and read the value from the
display.
4. For manual operation, press the RANGE key.
(The AUTO indication goes off)
To return to the Auto Range mode, press and
hold the RANGE key for at least 1 second.
――――――――――――――――――――――――
Chapter 2 Measurement Procedures
Page 69
―――――――――――――――――――――――――――
2
17
.6 Continuity Checking
DANGER
Do not input voltage to the continuity checking
function. Doing so may damage the unit or cause
an accident resulting in injury or death.
1. Set the function switch to,.
2. Connect the red test lead to the V, Ω
terminal, and the black to the COM terminal.
3. To select or change between
press the SHIFT/H.AUTO key.
4. During the continuity check, the
lights.
5. Connect the test leads to the circuit to be
measured.
6. When the circuit is conducting, (at a
threshold value : less than 100 Ω±80 Ω) the
buzzer sounds, and displays a resistance
value. (It is fixed in the 500 Ω range.)
and,
indicator
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Chapter 2 Measurement Procedures
Page 70
18
2
―――――――――――――――――――――――――――
.7 Diode Check
DANGER
Do not input voltage to the diode checking
function. Doing so may damage the unit or
cause an accident resulting in injury or death.
To avoid electrical accidents, turn off the power
before measuring a circuit.
1. Set the function switch to,.
2. Connect the red test lead to the V, Ω
terminal and the black to the COM terminal.
3. To select or change between
press the SHIFT/H.AUTO key.
4. When the Diode check is selected, the
indicator lights.
5. Connect the test leads to the circuit to be
measured.
6. The display shows a value between 0.4 V and
0.7 V when the diode is normal. When the
test leads are reversed, an open circuit
voltage (less than 1.7 V) is displayed.
If the diode is short-circuited, the display
shows about 0 V ; if it is open-circuited, it
shows an open circuit voltage in both
directions.
and,
――――――――――――――――――――――――
Chapter 2 Measurement Procedures
Page 71
―――――――――――――――――――――――――――
2
19
.8 HOLD.Auto Function
HOLD.Auto Function can display the
maximum value during voltage, current or
frequency, duty factor measurement or
minimum value during resistance
measurement.
When pressing the SHIFT/H.AUTO key for at
least 1 second, the HOLD indicator lights. To
cancel it press the key again for at least 1
second.
Then the indicator will go out.
NOTE
――――――――――――――――――――――――
HOLD.Auto Function is disabled by changing
functions or by turning off the power switch.
■ For voltage, current or frequency, duty
factor measurement
・ The display values are not renewed when the
measured value is less than the dead zone.
The HOLD indicator goes on and off.
・ When the measured value is more than dead
zone, the maximum data is displayed and the
tester beeps.
・ It is fixed until getting a new value higher
than the previous one. The HOLD indicator
remains lit.
Chapter 2 Measurement Procedures
Page 72
20
―――――――――――――――――――――――――――
・ When the measured value is less than the
dead zone again, interprets it to be cut off
from the circuit to be measured, leaving it
fixed until getting a new value higher than
the dead zone until the interval, the HOLD
indicator starts to go on and off.
・ Dead zone
5.6 V range
±270 dgt.
The other voltage ranges, current and
frequency
Duty factor
±30 dgt.
below 50 dgt. or over 950 dgt.
NOTE
The HOLD.Auto function cannot be conducted
in the AC/DC 560 mV range.
■ For resistance measurement
・ The displayed values are not renewed when
the measured value is "OF". The HOLD
indicator goes on and off.
・ Display the minimum data and the tester
beeps.
・ It is fixed until getting a new value lower
than the previous one. The HOLD indicator
remains lit.
・ When the measured value is "OF" again,
interprets it to be cut off from the circuit to
be measured, leaving it fixed until getting a
new value next time, the hold indicator starts
to go on and off.
――――――――――――――――――――――――
Chapter 2 Measurement Procedures
Page 73
―――――――――――――――――――――――――――
2
21
.9 Overvoltage warning function
During voltage or current measurement, the
"OF" indication appears indicating polarity
and overvoltage and the buzzer sounds when
the reading exceeds the maximum value
(5610 dgt.).
NOTE
――――――――――――――――――――――――
A warning is given if reading exceeds "1010"
in the maximum range of the DC V setting or
10 A range, or "760" in the maximum range of
the AC V setting.
Chapter 2 Measurement Procedures
Page 74
22
2
n
―――――――――――――――――――――――――――
.10 Relative (Relative display) functio
Relative function operates on all
measurement functions. This function
displays the result of subtracting the
reference data from the measurement data.
When pressing the REL Key, the REL
indicator lights. To cancel it press the key
again, then the indicator will go out.
On starting the relative function, the
following operations are carried out.
1. The measurement range is fixed. If it is Auto
Range mode, it becomes manual range
operation (the AUTO indication goes off).
2. The displayed data is set as the reference
data.
3. If the displayed data overflows, the reference
data is set to zero.
4. If the measurement data overflows, or
overflow indication appears, including the
polarity of the overflow ("OF" or "-OF").
5. The bar graph displays according to the
measurement data (not the displayed data).
6. Overvoltage warning function operates
according to the measurement data. (See
Overvoltage warning function)
――――――――――――――――――――――――
Chapter 2 Measurement Procedures
Page 75
―――――――――――――――――――――――――――
NOTE
Relative function is disabled by changing
23
functions, by pressing SHIFT/H.AUTO Key or
RANGE key, or by turning off the power
switch.
――――――――――――――――――――――――
Chapter 2 Measurement Procedures
Page 76
24
2
―――――――――――――――――――――――――――
.11 Auto Power Save Function
・ The Auto Power Save function automatically
activates the Power Save mode about 30
minutes after the last operation.
・ The Auto Power Save function is
automatically enabled as soon as the power is
turned on (the APS indicator lights).
・ To restart operation from the Auto Power
Save mode, operate the function switch or
press the SHIFT/H.AUTO, RANGE or REL
key.
・ The Auto Power Save function can be canceled
by using the Power On Option. To cancel it,
turn on the power while pressing the
SHIFT/H.AUTO key. Continue pressing the
SHIFT/H.AUTO key down until the beep.
This disables the Auto Power Save function
until the power is turned off. (The APS
indicator goes off.)
NOTE
――――――――――――――――――――――――
Chapter 2 Measurement Procedures
In the Power Save mode, the LCD display
goes off, but the power remains on. When
restarting operation from the Power Save
mode, all settings are reset.
When using the unit for an extended period of
time, disable the Auto Power Save function
when you turn on the tester.
Page 77
―――――――――――――――――――――――――――
M
A
S
T
M
m
P
.
B
R
F
S
D
3
s
3
Chapter
Specification
.1 General Specifications
easurement SystemDual integration
C Measurement
ystem
ype of DisplayTN type LCD, 1/4 Duty, Dynamic
aximum
easurement count
olarity DisplayAutomatically lights only when ’−’
attery Low DisplayTheindicator lights.
ange SelectionAutomatic or Manual (except
unction SwitchRotary switch
ampling Rate2.5 times/s (except Hz)
imensions and Mass Approx. 76W×167H×33D mm
――――――――――――――――――――――――
True RMS measurement
Drive.
3-1/2 dgt., 5610 max. (however
with the Hz function, up to 14999)
current measurement)
2 times/s (Hz)
20 times/s (bar graph)
Approx. 2.99"W×6.58"H×1.30"D
(not including protrusion)
Approx. 280 g, 9.9 oz
Chapter 3 Specifications
25
Page 78
26
A
P
M
v
D
N
P
M
B
d
C
t
―――――――――――――――――――――――――――
ccessories9170 TEST LEADS
ower SupplyRated supply voltage 1.5 VDC×2,
aximum rated
oltage
9378 CARRYING CASE
Instruction manual
Two R03 manganese batteries
In the 10 A range, the measuring time is continuous up to 7 A, and
one minute or less from 7 A to 10 A.
For AAC function,
・Frequency range:50 Hz to 2 kHz
・Crest factor:1.7 (560.0μA, 56.00 mA ranges) 3 (other ranges)
・The accuracy figures are determined with at least 10% of full
scale deflection.
Over
Protection
for 1 minut
1 A/600 V
FUSED
(56μA to
560 mA
range)
10 A/600 V
FUSED
(10 A range
――――――――――――――――――――――――
Chapter 3 Specifications
Page 83
―――――――――――――――――――――――――――
G
4
d
e
4
31
Chapter
Maintenance an
Servic
.1 Changing the Batteries and Fuses
WARNIN
To avoid electric shock when replacing the
batteries and fuses, first disconnect the test
leads from the object to be measured. Also,
after replacing the batteries and fuses, always
replace the cover and tighten the screws before
using the tester.
When replacing the batteries, do not install old
batteries with new ones, and do not mix
different types of batteries. Check the battery
polarity carefully when inserting the batteries.
Do not short-circuit used batteries, disassemble
them, or throw them in a fire. Doing so may
cause the batteries to explode.
Be sure to dispose of used batteries according
to their type in the prescribed manner and in the
proper location.
Only use fuses of the specified type that is rated
for the specified current and voltage. Using a
fuse that does not meet the specifications or
shorting the fuse holder may cause an accident
that might result in injury or death.
――――――――――――――――――――――――
Chapter 4 Maintenance and Service
Page 84
32
For μA・mA Terminal fuse
‑1
Two R03 manganese
10 A Terminal fuse
10
Lower case
―――――――――――――――――――――――――――
In order to protect the circuitry, a fuse is
provided for μA, mA or A terminals.
When current does not measured normally,
the fuse might be blown by over current.
Referring to the diagram, change the
batteries or fuses as follows:
1. Disconnect the test leads from the circuit
being tested, and place them in such a way
that they do not wind around the unit. Set
the function switch to OFF.
2. Turn the unit so that the lower case (the
underside of the unit) faces upwards, then
remove the three screws using a phillips
screwdriver.
3. Take off the lower case.
4. Change the batteries or the fuses.
5. Attach the lower case, and then tighten the
screws.
batteries
――――――――――――――――――――――――
Chapter 4 Maintenance and Service
Made by Cooper Bussmann Inc. KTK‑
10 A/600 V φ10.319×38.1 mm
Made by Cooper Bussmann Inc. KTK
1 A/600 V φ10.319×38.1 mm
Page 85
―――――――――――――――――――――――――――
4
4
33
.2 Service
If the unit is not functioning properly, check
the batteries, the test leads wiring and fuse
blowing. If a problem is found, contact your
dealer or HIOKI representative. Pack the unit
carefully so that it will not be damaged
during transport, and write a detailed
description of the problem. HIOKI cannot
bear any responsibility for damage that
occurs during shipment.
.3 Cleaning
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.
――――――――――――――――――――――――
Chapter 4 Maintenance and Service
Page 86
34
―――――――――――――――――――――――――――
――――――――――――――――――――――――
Chapter 4 Maintenance and Service
Page 87
Page 88
Page 89
HIOKI 3257 DIGITAL HiTESTER
l
Instruction Manual
Publication date: October 2000 Revised edition 5
Edited and published by HIOKI E.E. CORPORATION
Technical Sales Support Section
All inquiries to Sales and Marketing International
Department
81 Koizumi, Ueda, Nagano, 386-11, Japan
・ All reasonable care has been taken in the production
of this manual, but if you find any points which are
unclear or in error, please contact your supplier or
the Sales and Marketing International Department
at HIOKI headquarters.
・ In the interests of product development, the contents
of this manual are subject to revision without prior
notice.
・ Unauthorized reproduction or copying of this manua
is prohibited.
Page 90
H
EAD OFFICE
8
T
8
E
H
6
T
8
3257A980-05 00-10-0004H
1 Koizumi, Ueda, Nagano 386-1192, Japan
EL +81-268-28-0562 / FAX +81-268-28-056
-mail: os-com@hioki.co.jp
IOKI USA CORPORATION
Corporate Drive, Cranbury, NJ 08512, USA
EL +1-609-409-9109 / FAX +1-609-409-910
Printed on recycled paper
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