Thank you for purchasing this Hioki 9275 Clamp- On
AC Sensor. In order to use this product effectively and
to ensure that it enjoys a long operational life, read
this Instructi on Manual carefully and then retain it for
future reference.
――――――――――――――――――――――――――――――――――
――――――――――――――――――――――――――――――――――――――
G
Notes on Safety
3
WARNIN
This instru ment is designed to prevent a ccidental
shock to the operator when properly used. However
no engineer ing design can render safe an instrument
which is used carelessly. Therefor e, this manual
must be read carefully and completely before making
any measure ment. Fa ilure to follow directions can
result in a serious of fat al accident.
Safety Symbols
This Instructi on 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 equip ment, be sure to
carefully read the f ollowing safet y notes.
Before performing any operation involving a part of
the equipment labeled with themark, the operator
should first refer to the corresponding explanation in
this Instruction Manual labeled with themark.
Themark in this Instruction Manual indicates
sections that the operator of this equipment must
read.
――――――――――――――――――――――――――――――――――
4
R
G
――――――――――――――――――――――――――――――――――――――
The foll owing symbols are used in this In struction
Manual to indicate the relative importance of cautions
and warning s.
Applies to operations which if carried out wrongly
DANGE
carry a very serious danger of accident to the user,
including the possibility of a fatal accident.
Applies to important notes on operation and
WARNIN
handling accompanied by a risk of serious injury or
death.
Applies to important notes on operation and
CAUTION
handling accompanied by a risk of injury to the
user or damages to the equipment.
NOTE
Indicates advice concerning the product
performance and its operation.
――――――――――――――――――――――――――――――――――
――――――――――――――――――――――――――――――――――――――
Inspection
After receiving the equipment, check it to make sure
that it was not damaged during transport.
In the event of any damage, or failure to operate
according t o specification, contact your nearest Hioki
representative of serv ice agent directly.
5
――――――――――――――――――――――――――――――――――
6
――――――――――――――――――――――――――――――――――――――
Notes on Use
Observe the following points in order to use this
equipment safely and most ef fectively .
CAUTION
・Do not subject the equipment to vibrations or shocks
during transport or h andling. Be especially careful to
avoid dropping the equipment.
・Do not store the equipment where it will be subject to
the direct sunlight, high temperature, high humidity,
or condensation. In such case, the equipment may
be damaged and the product specifications may not
meet standards.
・If stored or shipped in advance conditions or if
operation seems not to be completely normal, either
carry out an insp ection and c heck before using. In
the event of any damage, contact your nearest Hioki
representative of service agent directly.
・If there is any type of dust or dirt on the core contact
surfaces, measurements may be affected. Wipe it
away gently with a soft cloth.
・Do not apply any sort of mechanical impact to the
core section. Scratches on the core surfaces will
make accurate me asuremen ts imposs ible.
・Do not ben d or pull the sensor cable (especially
where the cable connects to the sensor) in order to
avoid damaging the sensor cable.
・In order to prevent d amages of this unit and the
sensor, never plug in or unplug the sensor connector
when the power is turned on.
・When the power for the Current Monitor is on, keep
the core section closed, except when clamping them
onto the conductor to be measured. (The facing surface
of the core section can be scratched while it is open.)
・Taking the sensor apart may damage the open-close
mechanism that could result in an inoperative unit.
――――――――――――――――――――――――――――――――――
――――――――――――――――――――――――――――――――――――――
1
al
Chapter
Gener
1.1 Product Overview
When connected to the 3270 Current Monitor or the
3271 AC Current Monitor, this clamp-on sensor can
output current waveforms without any need to cut the
conductor b eing measured, simply by clamping the
sensor onto the connector.
This equipment can thus be used in conjunction with a
recorder, an oscilloscope,orothersuchequipmentin
order to record and measure current waveforms.
7
――――――――――――――――――――――――――――――――――
1.1 Product Overview
8
――――――――――――――――――――――――――――――――――――――
1.2 Features
Highly accurate current detection
Easy cu rrent measurement
Complete sensor compatibility
Broadband freq uency characteristics 0.5 Hz to 1 MHz
(-3dB)
Large opening that permits measurement of high
current levels.
Protectfunctionatexcessiveinput
――――――――――――――――――――――――――――――――――
1.2 Features
――――――――――――――――――――――――――――――――――――――
e
n
r
e
k
2
rs
Chapter
Identification of Indicato
Current direction mar
Lever
Facing surfac
9
Core sectio
Sensor connecto
Sensor cabl
――――――――――――――――――――――――――――――――――
10
R
3
re
――――――――――――――――――――――――――――――――――――――
Chapter
Measurement Procedu
For deta ils on how to take measurements, refer to a
sectionMeasurement Procedure" of the Current
Monitor Instruction manua l.
3.1 Notes on Use
DANGE
In orde r to prevent short circuits and injury or
death, only use this sensor on circuits c arrying less
than 600 V peak.
In orde r to prevent short circuits and electric
shocks w hile the core section is open, do not use
this sen sor on bare conductors. The core and
shield c ase are not insulated.
――――――――――――――――――――――――――――――――――
3.1 Notes on Use
――――――――――――――――――――――――――――――――――――――
11
3.2 Measurement Procedure
(1) Gently press the lever of the sensor to open the core
section.
(2) Position the sensor so that the current direction mark on
the sensor part points in the direction of the load and so
that the conductor being measured is centered, and then
close the clamp.
NOTE
NOTE
If the conductor being measured is not centered, the
results may be affected by its position.
(3) Shake the sensor and confirm that the lever is completely
locked.
Accurate measurement is not possible if the sensor is not
locked.
CAUTION
・Do not input current that exceeds the maximum input
range. The maximum input range differ s, depending
on the frequency of measured current. (See Fig. 2.)
・If current that exceeds the maximum input range is
input, overheating of the sensor will trip the protective
function for the internal circuitry, so the unit will no
longer produce accurate output. If this happens,
eliminate the input immediately (eithe r by removing
the sensor from the conductor being measured or by
reducing the input current to zero). (Wait until the
sensor has had sufficient time to cool before
resuming operation.)
・If the above situation occurs repeatedly, or if current
in excess of the maximum input range is input
continuously, the sensor could be damaged.
――――――――――――――――――――――――――――――――――
3.2 Measurement Procedure
12
――――――――――――――――――――――――――――――――――――――
NOTE
・Accurate measurements are not possible when
measuring o verlapping DC components of ten and
several amp eres or more.
・Immediately after the power is turned on and open or
close sensor, depending on the cond ition of the
internal ci rcuitry, the output waveform will fluctuate
up and down for approximately several ten seconds
until it stabilizes. (However, a small amount of
fluctuation will remain.)
・Depending on the measured current value and the
frequency, however some sound may be produced b y
resonation, it h as no effect on measurements.
・If a circuit carrying a larg e current is nearby,
measurements may be affected by external magnetic
fields.
――――――――――――――――――――――――――――――――――
3.2 Measurement Procedure
――――――――――――――――――――――――――――――――――――――
4
s
13
Chapter
Product Specification
(Accuracy is guaranteed at 23 ℃±3 ℃ after the power
has been on for 30 minutes)
■ Rated current 150 A AC
■ Output voltage 1.5 V AC/150 A AC
■ Output resistance 50 Ω
■ Input impedance 0.02 mΩ or less at 55 Hz
(see Fig. 1)
■ Continuous maximum 150 A (see Fig. 2)
input range
■ Maximum peak 400 A noncontinuous (peak
current value value)
■ Amplitude accuracy ±0.5 % rdg. ±0.05 % f.s.
(45 to 66 Hz)
■ Phase accuracy ±0.2
■ Frequency band 0.5 Hz to 1 MHz (-3 dB)
(see Fig. 3, example of
characteristics)
■ Frequency characteristics 1 Hz to 10 Hz: ±3.0 % or less
(Deviation from accuracy) 10 Hz to 10 kHz: ±1.0 % or less
10 kHz to 100 kHz: ±3.0 % or less
■ Temperature for ±0.05 % f.s./℃ or less (within
sensitivity a range of 0 to 40 ℃)
■ Noise 1 mV rms or less (with a
voltmeter for up to 20 MHz)
■ Power consumption 2 VA max. (with rated input)
■ Supply voltage ±12 V ±1V
■ Operating temperature 0to40℃, 80 % RH or less
――――――――――――――――――――――――――――――――――
(45 to 66 Hz)
14
――――――――――――――――――――――――――――――――――――――
and humidity (no condensation)
■ Storage temperature -10 to 50 ℃, 80 % RH or less
and humidity (no condensation)
■ Effect of external Equivalent to a maximum of 1 A
magnetic fields (in a 400 A/m AC current
magnetic field)
■ Effect of conductor Within ±1%
position
■ Dielectric strength 2200 V AC for one minute
(between electric circuit and case)
■ Insulation resistance 500 V DC, 100 MΩ or more
(between electric circuit and case)
■ Maximum permitted 600 V peak; (the core, shield
circuit voltage case, and electrical circuits are
(insulated conductor) not insulated.)