Hioki 3255-50 Instruction Manual
INSTRUCTION MANUAL
3255-50
DIGITAL HiTESTER
i
Contents
Contents
Introduction...............................................................1
Inspection..................................................................1
Safety Notes .............................................................2
Usage Notes.............................................................6
Chapter 1 Overview 13
1.1 Product Overview....................... ...... ..... ....13
1.2 Features....................................................13
1.3 Parts Names and Functions......................14
Chapter 2 Measurement Procedures 17
2.1 Connection................................................17
2.2 Voltage Measurement...............................19
2.3 Current Measurement ...............................21
2.4 Resistance Measurement..........................24
2.5 Continuity Check .......................................25
2.6 Diode Check..............................................26
Chapter 3 Additional Functions 27
3.1 Auto Range Function and Manual Range
Function.....................................................27
3.2 HOLD AUTO Function...............................29
3.3 Overflow Warning Function.......................30
3.4 Auto Power Save Function........................31
Contents
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Chapter 4 Specifications 33
4.1 General Specifications..............................33
4.2 Accuracy ................................................... 37
Chapter 5 Maintenace and Service 39
5.1 Replacing the Batteries and Fuses........... 39
5.2 Cleaning and Storage............................... 42
5.3 Service......................................................43
1
Introduction
Thank you for purchasing the HIOKI "3255-50
DIGITAL HiTESTER." To obtain maximum performance from the product, please read th is manual
first, and keep it handy for future reference.
Inspection
When you receive the product, inspect it carefully
to ensure that no damage occurred during shipping. In particular, check the accessories, panel
switches, and connectors. If damage is evident, or
if it fails to operate according to the specifications,
contact your dealer or Hioki representative.
Introduction
Accessories
• 9207-10 TEST LEAD .....................................1
• Instruction Manual..........................................1
• R03 Manganese battery.................................2
(Supplied with this product, for monitor)
• 9371 CARRYING CASE ................................1
Options
• 9010 CLAMP ON PROBE
• 9018 CLAMP ON PROBE
Safety Notes
2
Safety Notes
This manual contains information and warnings
essential for safe operation of the product and for
maintaining it in safe operating condition. Before
using the product, be sure to carefully read the following safety notes.
This product is designed to conform to 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 product. 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 product defects.
3
Safety Symbols
In the manual, the symbol indicates particularly important information that the user should
read before using the product.
The symbol printed on the product indicates
that the user should refer to a corresponding topic
in the manual (marked with the symbol) before
using the relevant function.
Indicates that dangerous voltage may be present
at this terminal.
Indicates a double-insulated device.
Indicates a grounding terminal.
Indicates DC (Direct Current).
Safety Notes
Symbols
Indicates AC (Alternating Current).
Indicates DC (Direct Current) or AC (Alternating
Current).
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 product.
Advisory items related to performance or correct
operation of the product.
Safety Notes
4
Other Symbols
Indicates the prohibited action
Accuracy
We define measurement tolerances in terms of f.s.
(full scale), rdg. (reading) and dgt. (digit) values,
with the following meanings:
f.s.
rdg.
dgt.
(maximum display value or scale length)
The maximum displayable value or the full length
of the scale. This is usually the maximum value of
the currently selected range.
(reading or displayed value)
The value currently being measured and indicated
on the measuring product.
(resolution)
The smallest displayable unit on a digital measuring product, i.e., the input value that causes the
digital display to show a "1".
5
Safety Notes
Measurement categories (Overvoltage categories)
This product conforms to the safety requirements for CAT III
600V, CAT II 1000V measurement products.
To ensure safe operation of measurement products, 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
trical outlet through a transformer or similar device.
CAT II
an AC electrical outlet by a power cord (portable tools, household appliances, etc.)
CAT III
installations) connected directly to the distribution panel, and
feeders from the distribution panel to outlets.
CAT IV
entrance, and to the power meter and primary overcurrent
protection device (distribution panel).
Higher-numbered categories correspond to electrical environments with greater momentary energy, so a measurement
: Secondary electrical circuits connect ed to an AC elec-
: Primary electrical circuits in equipment connected to
: Primary electrical circuits of heavy equipment (fixed
: The circuit from the service drop to the service
product designed for CAT III environments can endure
greater momentary energy than one designed for CAT II.
Using a measurement product in an environment designated
with a higher-numbered category than that for which the product is rated could result in a severe accident, and must be
carefully avoided.
Never use a CAT I measuring product in CAT II, III, or IV environments.
The measurement categories comply with the Overvoltage
Categories of the IEC60664 Standards.
Usage Notes
6
Usage Notes
Follow these precautions to ensure safe operation
and to obtain the full benefits of the various functions.
Inspection before Use
• 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.
• Before using the product, make sure that the insulation on the test leads is undamaged and that no
bare conductors are improperly exposed. Using
the product under such conditions could result in
electrocution. Replace the test leads with the
specified Hioki Model 9207-10.
Inst a llat ion, Ope ratin g Environm ent, and Handli ng
• To avoid electric shock, do not allow the
product to get wet, and do not use it when
your hands are wet.
• Do not use the product where it may be
exposed to corrosive or combustible
gases. The product may be damaged or
cause an explosion.
7
Usage Notes
Observe the following to avoid damage to the
product.
• Installation and Operating Environment
Between 0°C and 40°C; 80% RH or less;
indoors only. Howev er, it can be safely operated
at as low as -10°C.
• Do not store or use the product where it could
be exposed to direct sunlight, high tem perature
or humidity, or condensation.
Under such conditions, the product may be
damaged and insulation may deteriorate so that
it no longer meets specifications.
• Although this product is designed to resist the
ingress of dust and water, it is not entirely wateror dust-proof, so to avoid shoc k or damage, do
not use it in a wet or dusty environment.
The protection rating for the enclosure of this
device (based on EN60529) is *IP54.
• Do not use the product near a device that generates a strong electromagnetic field or electrostatic charge, as these may cause erroneous
measurements.
• To avoid damage to the product , protect it from
vibration or shock during transport and handling,
and be especially careful to avoid dropping.
*IP54 This indicates the degree of protection provided by
the enclosure of the device against use in hazardous locations, entry of solid foreign objects, and
the ingress of water.
5: Protected against access to hazardous parts with
wire measuring 1.0 mm in diameter. Dust-proof
type (The penetration of dust cannot be prevented
completely, but quantities of dust that may hinder
the stated operation of equipment or safety cannot
penetrate the enclosure.)
4: The equipment inside the enclosure is protected
against the harmful effects of water splashed
against the enclosure from any direction.
Usage Notes
8
• Adjustments and repairs should be made only
by technically qualified personnel.
• If the protective functions of the product are
damaged, either remove it from s ervice or mark
it clearly so that others do not use it inadvertently.
• To avoid corrosion from battery leakage, remove
the batteries from the product if it is to be stored
for a long time.
• Accurate measurement may be impossible in the
presence of strong magnetic fields, such as near
transformers and high-current conductors, or in
the presence of strong electromagnetic fields
such as near radio transmitters.
• To avoid battery depletion, turn the function
selector OFF after use (the Auto Power Save
feature consumes a small amount of current).
• The indicator appears when ba ttery voltage
becomes low. Replace the batteries as soon as
possible.
Handling the Cables
• The ends of the test leads are sharp. Be careful
to avoid injury.
• To avoid damaging the cables, do not bend or
pull the cables.
• Avoid stepping on or pinching the cable, which
could damage the cable insulation.
9
Connection and Measurement
For other precautions and details, see explanations of the measurement procedures.
Use only the specified test lead or clamp-on probe.
Using a non-specified cable may result in incorrect
measurements due to poor connection or other
reasons.
When measuring a breaker
This product should only be connected to the
secondary side of a breaker, so the breaker
can prevent an accident if a short circuit
occurs. Connections should never be made
Usage Notes
to the primary side of a breaker, because
unrestricted current flow could cause a serious accident if a short circuit occurs.
Voltage Measurem ent
• The maximum input voltage is 1000
VDC,1000 Vrms(sin), or 10
ing to measure voltage in excess of the
maximum input could destroy the product
and result in personal injury or de ath.
• The maximum rated voltage between input
terminals and the ground is as follows;
(CAT II) DC 1000 V, AC1000 Vrms (sin) or
10
(CAT III) DC 600 V, AC600 Vrms (sin) or
10
7
V•Hz
7
V•Hz
7
V•Hz. Attempt-
Attempting to measure voltages exceeding
this level with respect to ground could
damage the product and result in personal
injury.
Usage Notes
10
Resistance Measurement, Checking the
Continuity or Diode
Never apply voltage to test leads when the
Resistance, Continuity or Diode Check functions are selected. Doing so may damage
the product and result in personal injury.
To avoid electrical accidents, remove power
from the circuit before measuring.
Current Measurement
(When using the optional Clamp-on Probe)
Connect the Clamp-on probe to the product
first, and then to the active lines to be measured.
Observe the following to avoid electric shock
and short circui t s.
• Never attach the clamp-on probe to a circuit that operates at more than 600 V, or
over bare conductors.
• When the Clamp-on probe is opened, do
not allow the metal part of the clamp to
touch any exposed metal, or to short
between two lines.
To avoid electric shock when measuring live
lines, wear appropriate protective gear, such
as insulated rubber gloves, boots and a
safety helmet.
11
Usage Notes
• To prevent damage to the product and Clampon probe, never connect or disconnect a sensor
while the power is on.
• Be careful to avoid dropping the Clamp-on
probe or otherwise subjecting them to mechani-
cal shock, which could damage the m ating surfaces of the core and adversely affect
measurement.
• Keep the clamp jaws and core slits free from foreign objects, which could interfere with clamping
action.
Usage Notes
12
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