Hioki 3255 Instruction Manual

3255
DIGITAL HiTESTER
Instruction Manual
October 2000 Edition 1 Printed in Japan
3255A981-00 00-10-H
Introduction
Thank you for purchasing the Hioki Model 3255 DIGITAL HiTESTER.
To obtain maximum performance from the instrument, please read
this manual first, and keep it handy for future reference.
Initial Inspection
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.
Preliminary Checks
Before using the instrument, make sure that the insulation on the test leads is
undamaged and that no bare conductors are improperly exposed. Using the
instrument in such conditions could cause an electric shock. Replace the test
leads with the specified Hioki Model 9185.
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, thinner or gasoline, as they can deform and
discolor the case.
If the instrument seems to be malfunctioing, confirm that the batteries are
not discharged or the test leads broken before contacting your dealer or
Hioki representative.
Specifications
Accuracy Chart (23 5 , 80% RH or less, non-condensating)
DC Voltage function ( . V / mV )
Range Accuracy Input Impedance Remarks
0.5%rdg. 4 dgt.
320.0 mV Approx. 10 MΩ Response time: Approx. 2 sec
0.5%rdg. 4 dgt.
3.200 V Approx. 11 MΩ
1.3%rdg. 4 dgt.
32.00 V Approx. 10 MΩ
1.3%rdg. 4 dgt.
320.0 V Approx. 10 MΩ
1.3%rdg. 4 dgt.
600 V Approx. 10 MΩ
V mV
AC Voltage function ( . / )
Range Accuracy Input Impedance Remarks
2.0%rdg. 8 dgt.
320.0 mV Approx. 10 MΩ Measurement Frequency
2.0%rdg. 8 dgt.
3.200 V Approx. 11 MΩ Range: 50 Hz to 500 Hz
2.0%rdg. 8 dgt.
32.00 V Approx. 10 MΩ Response time: Approx. 2 sec
2.0%rdg. 8 dgt.
320.0 V Approx. 10 MΩ
2.0%rdg. 8 dgt.
600 V Approx. 10 MΩ
Resistance Measurement function (Ω Ω Ω Ω )
Range Accuracy Open Terminal Full Scale
Voltage
1.5%rdg. 6 dgt.
320.0 Ω 1.7 V or less 3149
1.5%rdg. 4 dgt.
3.200 kΩ 0.45 V or less 3239
1.5%rdg. 4 dgt.
32.00 kΩ 0.45 V or less 3249
1.5%rdg. 4 dgt.
320.0 kΩ 0.45 V or less 3249
1.5%rdg. 4 dgt.
3.200 MΩ 0.45 V or less 3249
10.0%rdg. 4 dgt.
32.00 MΩ 0.45 V or less 3249
Continuity Check function ( )
Accuracy Open Terminal Threshold
Voltage level
250 Ω or less
2.5%rdg. 6 dgt.
1.7 V or less
Diode Check function ( )
Accuracy Open Terminal Measurement
Voltage Current
5.0%rdg. 4 dgt.
1.7 V or less 1.0 mA or less
Response Time: Transition time from the lowest range to the measurement
range, plus display settling time.
Overload protection is 600 V AC/DC rms (sine wave) or 10 7 V Hz for all
functions and ranges.
General
Measurement Method Dual integration
Display Type TN type LCD, 1/3 duty, dynamic drive, 12-mm character
height, Max. 3249 counts (600 counts only in 600 V range)
Display Elements Polarity indicator: "-" sign (automatic)
Overflow indicator: "OF" or "-OF"
Other indicators: units, functions
Range Switching Auto/Manual Range (single range for mV, continuity and
diode check)
Function Selector Rotary selector
Input Terminals + and COM terminals (2 terminals)
Sampling Rate 2.5 times/sec
Size & Weight 70W x 145H x 31D mm (2.76" x 5.71" x 1.22") (without
protrusions), 200 g (7.1 oz.) (within battery)
Accessories 9185 TEST LEADS, 9371 CARRYING CASE,
Instruction Manual
Electrical Characteristics
Power Supply Rated supply voltage: 1.5 V DC x 2, R03 manganese x 2
7
Maximum rated working 600 V DC/AC rms (sine wave) or 10 VHz (for 1 min.), for all
Voltage functions
Dielectric Strength Input terminals to case: 5.55 kVrms (50/60-Hz sine wave for
one minute)
Noise Suppression NMRR: DC -40 dB or better (50/60 Hz)
CMRR: DC -100 dB or better (50/60 Hz)
AC -60 dB or better (50/60 Hz)
Rated Power 5.0 mW typ. (DC Voltage function, from two 1.5 V batteries)
6.0 mW typ. (AC Voltage function, from two 1.5 V batteries)
0.15 mW typ. (Auto Power Saving, from two 1.5 V batteries)
Maximum Rated Power 6.0 mVA
Battery Status Indicator indicates low battery (< 1.2 V 0.1 V)
Continuous Operating Approx. 400 hours (DC Voltage function)
Time Approx. 250 hours (AC Voltage function)
Environmental Conditions
Operating Temperature 0 to 40 (32 to 104 ) at 80% RH or less (non-condensating)
& Humidity
Storage Temperature & -20 to 60 (-4 to 140 ) at 70% RH or less (non-condensating)
Humidity
Temperature (Measurement accuracy) 0.1/
Characteristic
Operating Environment Indoors, <2000 m (6562 feet) ASL
Dust and Water Equivalent to JIS Protection Type Class 4 (however,
Protection instrument operation is not guaranteed when wet)
Electromagnetic 4% f.s. or less at 3 V/m electromagnetic radiation
Radiation Susceptibility
Standards Conformance
Safety EN61010-1:1993 Polution Degree 2, Overvoltage Category III
(Anticipated Transient Overvoltage: 6000 V), EN61010-2-031:1994
EMC EN55011:1991, EN50082-1:1992
Safety
Follow these precautions to ensure safe operation and to obtain the full
benefits of the various functions.
DANGER
This device 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 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 product defects.
Response time
Overvoltage Categories (CAT)
Approx. 3 sec
This device conforms to the safety requirements for CAT III measurement
Approx. 3 sec
Approx. 3 sec instruments. To ensure safe operation of measurement instruments, IEC
Approx. 3 sec
60664 establishes safety standards for various electrical environments,
Approx. 5 sec
categorized as CAT I to CAT IV, and called overvoltage categories. These are
Approx. 20 sec
defined as follows.
CAT I: Secondary electrical
Response time
circuits connected to an AC
electrical outlet through a
Approx. 0.2 sec
transformer or similar device.
CAT II: Primary electrical
Response time
circuits in equipment connected to
an AC electrical outlet by a power
Approx. 2 sec
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).
Higher-numbered categories correspond to electrical environments with
greater momentary energy, so a measurement instrument designed for CAT
III environments can withstand greater momentary energy than one designed
for CAT II. 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.
This manual contains information and warnings essential for safe operation of
the instrument and for maintaining it in safe operating condition. Before using
the instrument, be sure to carefully read the following safety notes.
Safety symbols
In the manual, the symbol indicates particularly important
information that the user should read before using the
instrument.
The symbol 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.
Indicates a device that is protected by double or
supplemental insulation.
Indicates direct current (DC).
Indicates alternating current (AC).
Indicates both DC and AC.
Indicates a protective ground terminal.
The following symbols in this manual indicate the relative importance of
cautions and warnings.
Indicates that incorrect operation presents an extreme
DANGER
hazard that could result in serious injury or death to the
user.
Indicates that incorrect operation presents a significant
WARNING hazard that could result in serious injury or death to the
user.
Indicates that incorrect operation presents a possibility of
CAUTION
injury to the user or damage to the instrument.
Advisory items related to performance or correct
NOTE
operation of the equipment.
Usage Notes
WARNING
To avoid electric shock, do not allow the instrument to get wet,
and do not use it when your hands are wet.
Do not use the instrument where it may be exposed to corrosive
or combustible gases. The instrument may be damaged or cause
an explosion.
CAUTION
Although this instrument is designed to resist ingress of dust and
water, it is not entirely or water- or dust-proof, so to avoid shock or
damage, do not use it in a wet or dusty environment.
This instrument is designed for indoor use, and operates reliably from 0
to 40 .
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.
Do not use the instrument near a device that generates a strong
electromagnetic field or electrostatic charge, as these may cause
erroneous measurements.
To avoid damage to the instrument, protect it from vibration and shock
during transport or handling. Be especially careful to avoid dropping.
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.
Adjustments and repairs should be made only by technically qualified
personnel.
NOTE
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 battery voltage becomes low. Replace
the batteries as soon as possible.
To avoid corrosion from battery leakage, remove the batteries from the
instrument if it is to be stored for a long time (several months or more).
Replacing the Batteries
WARNING
To avoid electric shock when replacing the batteries, first
disconnect the test leads from any measurement object.
Before using the instrument after replacing the batteries, replace
the cover and screw.
Do not mix old and new batteries, or different battery types. Also,
be careful to observe battery polarity during installation.
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.
1. Place the instrument back-side up, and remove
1
the Philips screw affixing the rear cover.
2
2. Remove the rear cover.
3. Replace both batteries.
4. Replace the rear cover back to keep the
Packing
dustproof and waterproof devices good condition,
attach the packing correntry without fail.
5. Replace the screw to affix the rear cover.
Replacing the Fuse
CAUTION
If the fuse blows, do not attempt to replace it or repair the instrument:
contact your dealer or Hioki representative. To determine if the fuse has
blown, check whether the beeper sounds when the test leads are shorted
during a continuity check.
Fuse Protection Circuitry
A 10 Ω protective resistor and 1 A safety fuse (600 V AC, 100 kA cut-off
capacity) are installed in series with the positive terminal of the instrument to
prevent short-circuit accidents during voltage measurement of power line
circuits. If a short occurs in the instrument circuitry, current flow is limited by
the protective resistance until the safety fuse opens. The protective resistance
limits the short-circuit current, minimizing arcing at the tip of the test probe
and providing safer operation.
3
Batteries