Name of Parts
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.
POWER button
LCD (Display)
Power On/Off
(Hold for one
second to turn off)
Data Hold display
Detecting element
Instruction Manual
September 2013 Revised edition 5
Printed in Japan
3258A981-05 13-09H
Auto Power Off enabled
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.
Low-Battery Warning
HOLD button (with internal lamp)
• Data Hold/Cancel (Data Hold function)
• Cancels APS (Auto Power Off function)
Safety Symbol
In the manual, the
symbol indicates particularly important
information that the user should read before using the instrument.
symbol printed on the instrument indicates that the user
should refer to a corresponding topic in the manual (marked with
symbol) before using the relevant function.
Probe (with display)
Indicates AC (Alternating Current).
Indicates DC (Direct Current).
Warranty malfunctions occurring under conditions of normal use in conformity with the Instruction Manual and Product Precautionary Markings will be repaired free of charge. This warranty is valid for a period
of three (3) years from the date of purchase. Please contact the distributor from which you purchased the product for further information on
warranty provisions.
Thank you for purchasing the HIOKI Model 3258 SAFETY HiTESTER.
To obtain maximum performance from the instrument, please
read this manual first, and keep it handy for future reference.
The HiTester employs a coupling capacitance cancellation
method to measure voltage in AC circuits without requiring metal-to-metal contact. Voltage can be measured safely in practically any location, on either insulated or exposed metal
conductors.The inter-probe voltage measurement design is ideal for confirming line voltage.
When you receive the instrument, inspect it carefully to ensure
that no damage occurred during shipping. If damage is evident,
or if it fails to operate according to the specifications, contact
your dealer or Hioki representative.
Maintenance and Service
• 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.
• If the protective functions of the instrument are damaged,
either remove it from service or mark it clearly so that others
do not use it inadvertently.
• If the instrument seems to be malfunctioning, contact your
dealer or Hioki representative.
• Pack the instrument so that it will not sustain damage during
shipping, and include a description of existing damage. We do
not take any responsibility for damage incurred during shipping.
Indicates a double-insulated device.
Probe (without display)
Indicates a grounding terminal.
Battery box
Symbols for Various Standards
WEEE marking:
This symbol indicates that the electrical and electronic appliance
is put on the EU market after August 13, 2005, and producers of
the Member States are required to display it on the appliance
under Article 11.2 of Directive 2002/96/EC (WEEE).
This symbol indicates that the product conforms to safety regulations set out by the EC Directive.
The following symbols in this manual indicate the relative importance of cautions
and warnings.
Indicates that incorrect operation presents an extreme hazard
that could result in serious injury or death to the user.
Indicates that incorrect operation presents a significant hazard
that could result in serious injury or death to the user.
Indicates that incorrect operation presents a possibility of
injury to the user or damage to the device.
Indicates advisory items related to performance or correct
operation of the instrument.
Measurement categories
This instrument complies with CAT IV (600V) 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: 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
Using a measurement instrument in an environment designated with a highernumbered 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 CAT-rated in CAT II to CAT IV measurement applications could result in a severe accident, and must be carefully
Volts (units)
LR6 (AA-size) alkaline battery × 6
Usage Notes
This instrument may cause interference if used in residential areas. Such use must be avoided unless the user takes special
Follow these precautions to ensure safe operation and to obtain measures to reduce electromagnetic emissions to prevent interthe full benefits of the various functions.
ference to the reception of radio and television broadcasts.
• To avoid electric shock when measuring live lines,
wear appropriate protective gear, such as insulated rubber gloves, boots and a safety helmet.
• 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, do not hang cables over
your body.
• Touching any of the high-voltage points inside the HiTester is very
dangerous. Do not attempt to modify, disassemble or repair the
HiTester; as fire, electric shock and injury could result.
• 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°C without degrading safety.
• This instrument is not designed to be entirely water- or dust-proof.
Do not use it in an especially dusty environment, nor where it might
be splashed with liquid. This may cause damage.
• 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 use the instrument near a source of strong electromagnetic
radiation, or near a highly electrically charged object. These may
cause a malfunction.
• To avoid breaking the cables and probes, do not bend or pull them.
• Avoid stepping on or pinching cables, which could damage the cable insulation.
• Keep in mind that, in some cases, conductors to be measured may be hot.
When the line to be measured is live (30 V AC
or more present), the HOLD button lamp blinks.
Monitors contact conditions between the
detecting elements and object to be measured,
Live Wire Check
and displays the measured value when the
detecting elements are properly applied.
At this point, the HOLD button lamp lights.
While the detecting elements are not properly
applied, “----” is displayed.
Data hold is inactive when the HOLD button is
blinking or off (unlit).
When the HOLD button lamp is lit, press the
HOLD button to hold the measured value on
the display (
appears on the LCD, and
Data Hold Function the HOLD button lamp turns off).
When Data Hold is active, overflow warning
and live wire check functions are disabled.
To Cancel: Press the HOLD button again
is cleared from the display).
occurs when the measured value
Overflow Warning
exceeds 600 V (“600 V” appears blinking, and
the HOLD button lamp also blinks).
The Auto Power Off function is enabled when
the power is turned on (APS appears on the
Auto Power Off
Power is automatically turned off after ten minFunction
utes of inactivity (since the last operation).
To disable Auto Power Off, hold the HOLD button when turning the power on.
Warning Function
When the battery voltage gets low
on the LCD, and the power turns off automatically soon afterwards.
is displayed, the measurement value
blinks and the HOLD button is disabled.
1 Pre-Operation Inspection (Required)
Measurement Procedure
Replacing the Batteries
To avoid electric shock, always confirm the following before
Preliminary Checks
Confirm the following items before using the HiTester. Apply the probes to live conductors with a known voltage of least
• Check for any damage from storage or transportation, and
ensure that the cable insulation is intact and that no bare
metal is exposed. Any damage could present an electrical
hazard, so contact your supplier or Hioki representative if
damage is found.
• Turn the power on and confirm that the batteries are not
depleted (if the low-battery indicator is
displayed, accurate measurements cannot be performed).
• Check that the detecting elements on the ends of the probes
are clean (accurate measurement may not be possible if a
detecting element is dirty).
30 V AC between them, and check the displayed values.Then
reposition the probes so that both are applied to the same (live)
conductors, and confirm the displayed voltage.
Note, however, that this method is not usable with shielded conductors.
• If the correct voltage is displayed, proceed with measurements.
• If the correct voltage is not displayed, do not proceed with
measurements. Contact your supplier or Hioki representative.
Check the cables to be measured.
Confirm that they are type IV or CV insulated cables with at least
100 mm2 cross-section.
AC Voltage Measurement
Observe the following precautions to avoid electric
1. Press the POWER button to turn the HiTester on.
• Avoid touching the ends of the probes beyond the 2. This is an inter-probe voltage measurement design. Apply the
detecting elements of both probes to the measurement points.
When measuring between the line and earth, one of the two
• The maximum rated voltage between input termiprobes must be contact with the granding line.
nals and ground is 600V AC. Attempting to measure voltages exceeding 600V with respect to 3. When the detecting elements are properly applied, measurement occurs, the HOLD lamp lights, and the measured voltground could damage the instrument and result in
age is displayed.
personal injury.
Operating Status
• Even when the HOLD button lamp is not lit and
when no measurement value is displayed, wiring
may be live, so avoid touching the electrical circuit.
Environmental and Safety Specifications
• To avoid electric shock when replacing batteries,
remove each probe from the object being measured
and turn the power off before opening the case.
• Use only LR6 (AA-size) alkaline batteries. Use of
any other battery may result in explosion.
• Do not mix old and new batteries, or different types
of batteries. Also, be careful to observe battery
polarity during installation. Otherwise, poor performance or damage from battery leakage could result.
• Battery may explode if mistreated. Do not shortcircuit, recharge, disassemble or dispose of in fire.
• Handle and dispose of batteries in accordance with
local regulations.
To avoid corrosion from battery leakage, remove the batteries from the
instrument if it is to be stored for a long time.
Replacing the batteries
Required items :
Phillips screwdriver and six new LR6 (AA-size) alkaline batteries.
Operating environment
Storage temperature
and humidity
Operating temperature
and humidity
Dielectric strength
Apply detecting elements perpendicular to and
flush with the surface of the cables to be measured.
Displays the measured voltage.
Displays To hold the displayed value, press the HOLD
measured button (Data Hold function).
If the detecting elements are not properly
applied to the objects being measured, “----” is
“600 V” is The voltage to be measured exceeds 600 V AC.
Blinking displayed, This is the over-range measurement state
(Overflow Warning function)
The object to be measured has live voltage
(30 V AC or more, Live Wire Check function).
Non-live condition or detecting element is
improperly applied to measurement object.
• This is an inter-probe voltage measurement design. Properly apply
the detecting elements of both probes to the measurement points.
• When battery charge is low,
is displayed, the HOLD button lamp
is not lit, and the measured value, “----” or “600 V” blinks, depending
on measurement conditions (Low-Battery Warning function).
• Be aware that measured values below 30 V AC are outside of the
range of guaranteed accuracy, regardless of any displayed value.
Voltage Detection
Maximum rated
voltage to earth
Coupling capacitance cancellation method
AC 600 V (Measurement Category IV)
Anticipated Transient Overvoltage: 8000 V
Functional Specifications Refer to the “Functions” section for details.
Auto Power Off
The HiTester automatically turns off after 10 ±1 minutes of
inactivity (since the last operation). The operator can disable
this function.
Holds the displayed value (displayed value updating is
stopped, can be disabled).
When the HiTester supply voltage falls below 6.3 V DC, this
indicator appears, the HOLD button is disabled, and measurement accuracy cannot be guaranteed.
The HiTester shuts itself off if the supply voltage falls to 5.5 V.
Low-Battery Warning
Guaranteed Accuracy Specifications
Hold the POWER button for one
second to turn the HiTester off.
Loosen the screw in the battery
compartment cover on the back
of the probe (without the display), and remove the cover.
LR6 (AA-size) alkaline battery × 6
Replace the batteries.
Confirm the correct polarity when
installing the new batteries.
Replace the battery compartment cover and screw.
When an error is displayed on the LCD, the HiTester requires
repair. Contact your supplier or Hioki representative.
Proper measurement is not possible.
Internal ROM Error
Calibration Data Faulty
E-03 to 05 Internal Variable Error
Accuracy guarantee
for temperature and
Guaranteed accuracy
Measurement Method
Measurement Ranges
Remedial Action
Repair is necessary.
Contact your supplier or
Hioki representative.
Display of “----” or blinking indicators on the LCD are not error indications.
• “----” is displayed when the detecting element on a probe is not applied correctly.
• The display blinks when the batteries are depleted, and when the
measured voltage exceeds 600 V.
1 year
True RMS value (True RMS)
AC 420.0 V/ 600 V
(Fully automatic ranging, no manual range selection)
420.0 V
0.0 V to
420.0 V
0.1 V
600 V
380 V to
600 V
Range of
30.0 V to
420.0 V
380 V to
480 V
481 V to
600 V
40 to 66 Hz
66 to 400 Hz
±1.5%rdg. ±5dgt.
±2.5%rdg. ±5dgt.
±2.0%rdg. ±5dgt.
±5.0%rdg. ±5dgt.
• Zero-suppression prevents display of values between 0.0 and 1.0 V.
is displayed, accuracy cannot be guaranteed.
Maximum rated
AC600 Vrms
voltage to earth
Circuit Dynamics
Crest Factor: 1.8 (in 600 V range, sine waves only)
Objects of
Insulated conductors (IV or CV equivalent, min. 100 mm2 xMeasurement
section), bare metal conductors
Note: Not usable on shielded conductors.
Influence of Conductor 0.5% rdg. IV or CV equivalent insulated conductors (combine
with above accuracy if diameter is 38 mm2 to 100 mm2)
0.05% rdg./°C (combine with above accuracy except at 23°C
±5°C (73°F±9°F))
Influence of Adjacent Within ±5% rdg. *The indicated voltage measurement value
(rdg.) can be affected by phase changes on the third wire when
measuring the other two wires in a 3-wire system.
Influence of External
Magnetic Field
Display Specifications
Voltage Display
23°C±5°C (73°F±9°F), 80%RH or less
AC Voltage Measurement Accuracy (Auto-Ranging):
Error Display
0 to 40°C (32 to 104°F), 80%RH or less (non-condensating)
Voltage Detection Specifications
Data Hold
Correct probe application
-10 to 50°C (14 to 122°F), 80%RH or less (non-condensating)
AC 8540 Vrms (@1 mA sensing current)
Between detecting elements and cable
Applicable standards Safety EN61010
EN61326 Class A
Power supply
DC 1.5 V × 6
LR6 alkaline battery × 6
Maximum rated power 2 VA
Maximum operating
Approx. 14 h (power on, no measurement), or the equivalent
of 1000 one-minute uses or 200 five-minute uses
Approx. 51W × 275H × 37.5D mm (Each device)
(2.01”W × 10.83”H × 1.48”D)
Cable length
Approx. 900 mm (35.43”)
Approx. 670 g (23.6oz.)
Instruction manual ×1, LR6 alkaline battery × 6
Carrying soft case ×1
• The HiTester normally emits beeping tones during operation.
• Accurate measurements may not be possible if the measured waveform contains frequency components outside of the specified frequency range for guaranteed accuracy.
• Dirt on the measurement surfaces can prevent accurate measurement.
• This is an inter-probe voltage measurement design. Ensure that the
detecting elements on the probes are properly applied to the object to
be measured, as illustrated below.
Indoors, Pollution degree2, altitude up to 2000 m (6562-ft.)
Function Display
4200 counts
Less than 10 counts zero-suppressed
................ Data Hold
APS ..................... Auto Power Off Active
........................ Low-Battery Warning
“600 V” (blinking)... Over-Range Measurement Indicator
(for 601+ V AC)
Not more than 2.4 s
Display Response
Display Refresh Interval 600 ms ±200 ms
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