Thank you for purchasing this Hioki 9274 Clamp-On
AC/DC Sensor. In order to use this product effectively
and to ensure that it enjoys a long operational life, read
this Instruction Manual carefully and then retain it for
future reference.
otes on Safety
1
WARNIN
This instrument is designed to prevent accidental
shock to the operator when properly used. However
no engineering design can render safe an instrument
which is used carelessly. Therefore, this manual
must be read carefully and completely before making
any measurement. Failure to follow directions can
result in a serious of fatal accident.
Safety Symbols
This Instru ction 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.
This symbol is affixed to locations on the equipment
where the operator should consult corresponding
topics in this manual (which are also marked with the
symbol) before using relevant functions of the
equipment.
In the manual, this mark indicates explanations
which it is particularly important that the user read
before using the equipment.
Page 18
2
R
G
N
I
DANGE
WARNIN
CAUTIO
The following symbols are used in this Instruction
Manual to indicate the relative importance of cautions
and warnings.
Indicates that incorrect operation presents extreme
danger of accident resulting in death or serious
injury to the user.
Indicates that incorrect operation presents
significant danger of accident resulting in death or
serious injury to the user.
Indicates that incorrect operation presents
possibility of injury to the user or damage to the
equipment.
NOTE
nspection
When the unit is delivered, check and make sure that it
has not been damaged in transit. In particular, check the
accessories, core section, and sensor connector.
If the unit is damaged, or fails to operate according to the
specifications, contact your dealer or Hioki representative.
Denotes items of advice related to performance of
the equipment or to its correct operation.
Page 19
N
N
otes on Use
In order to ensure safe operation and to obtain maximum
performance from the unit, observe the cautions listed
below.
3
CAUTIO
• Do not subject the unit to vibrations or shocks during
transport or handling. Be specially careful to avoid
dropping the unit.
• Do not store the unit where it will be exposed to direct
sunlight, high temperature, 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.
• Before using the unit, inspect it and check the operation
to make sure that the unit was not damaged due to
poor storage or transport conditions.
If damage is found, contact your dealer or Hioki
representative.
• 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 measurements impossible.
• Do not bend 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 damages of the Current Monitor and
this unit, never plug in or unplug the sensor connector
when the power is turned on.
Page 20
4
N
CAUTIO
• 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.)
• Takingthe sensor apart may damage the open-close
mechanism that could result in an inoperative unit.
Page 21
1
al
1
.1Product Overview
1
When connected to the 3270 Current Monitor, this clampon sensor can output current waveforms without any need
to cut the conductor being measured, simply by clamping
the sensor onto the conductor.
This equipment can thus be used in conjunction with a
recorder, an oscilloscope, or other such equipment in order
to record and measure current waveforms.
5
Chapter
Gener
.2Features
Highly accurate current detection
Easy current measurement
Complete sensor compatibility
Broadband frequency characteristics DC to 10 MHz
(-3 dB)
Compact and permits measurement of low current
levels
Protect function at excessive input
Particular developed thin film Hall element adoption.
Chapter 1 General
Page 22
6
Chapter 1 General
Page 23
C
"OPEN" indication
Facing surface
Lever
Core section
Sensor connector
Sensor cable
2
Identification of Indicato
rs
urrent direction mark "UNLOCK" indication
7
Chapter
Chapter 2 Identification of Indicators
Page 24
8
Chapter 2 Identification of Indicators
Page 25
R
3
Measurement Procedu
re
3
3
For details on how to take measurements, refer to Section
1.4, "Measurement Procedure" of the 3270 Current
Monitor Instruction manual.
.1Notes on Use
9
Chapter
DANGE
In order to prevent short circuits and injury or
death, only use this sensor on circuits carrying less
than 600 V peak.
In order to prevent short circuits and electric
shocks while the core section is open, do not use
this sensor on bare conductors. The core and
shield case are not insulated.
.2Measurement Procedure
(1) Pull the lever of the sensor towards the "OPEN"
indication 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.
Chapter 3 Measurement Procedure
Page 26
10
N
D
s
Lock state
NOTE
NOTE
CAUTIO
If the conductor being measured is not centered, the
results may be affected by its position.
(3) Press the lever forward until the "UNLOCK" indication
disappears, and confirm that the lever is completely
locked.
Accurate measurement is not possible if "UNLOCK" is
visible.
• Do not exceed the maximum allowable current input.
The maximum input range differs, depending on the
frequency of measured current. (See Figure 2.)
• If current exceeds the maximum allowable 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 (either 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.
• When opening the core section of the sensor, be sure
to operate with the lever. If an upper core is forced to
open, when the sensor is locked, the open-close
mechanism can be damaged.
Chapter 3 Measurement Procedure
o not pres
Page 27
11
NOTE
• Immediately after powering on, there may in some cases
be a large offset drift caused by self-generated heat from
the Current Monitor and this unit .
• When performing continuous measurements, it is
necessary to be aware that the offset voltage drifts,
depending on factors such as the ambient temperature.
• Depending on the measured current value and the
frequency, however some sound may be produced by
resonation, it has no effect on measurements.
• If a circuit carrying a large current is nearby,
measurements may be affected by external magnetic
fields.
Chapter 3 Measurement Procedure
Page 28
12
Chapter 3 Measurement Procedure
Page 29
13
4
s
Chapter
Product Specification
(Accuracy is guaranteed at 23°C ± 3°C after the power
has been on for 30 minutes )
♦ Rated current 20 A (AC + DC)
♦ Output voltage 2 V /20 A (AC + DC)
♦ Output resistance 50Ω
♦ Input impedance 0.1 mΩor less at 55 Hz
(see Figure 1)
♦ Continuous maximum 20 A (see Figure 2)
input range
♦ Maximum peak current 50 A noncontinuous (peak value)
value
♦ Amplitude accuracy ± 0.5 % rdg.± 0.1 % f.s.
(DC, 45to 66 Hz)
♦ Phase accuracy ± 0.2° (45to66Hz)
♦ Frequency band DC to 10 MHz (-3 dB) (see
Figure 3, example of
characteristics)
♦ Frequency characteristics DC to 1 kHz:± 2.0 % or less
(Deviation from accuracy) 1 kHz to 100 kHz:± 5.0 % or less
♦ Temperature coefficient ± 0.1 % f.s./°C or less
for sensitivity (within a range of 0 to 40°C)
♦ Noise 1 mV rms or less (with a
voltmeter for up to 20 MHz)
♦ Power consumption 1.5 VA max. (with rated input)
♦ Supply voltage ± 12 V± 1V
♦ Operating temperature 0to40°C, 80 % RH or less
and humidity (no condensation)
Chapter 4 Product Specifications
Page 30
14
♦ Storage temperature -10 to 50°C, 80 % RH or less
and humidity (no condensation)
♦ Effect of external Equivalent to a maximum of
magnetic fields 20 mA (in a 400 A/m AC current
magnetic field)
♦ Effect of conductor Within± 0.2 %
position
♦ Dielectric strength 2200 V AC for 1 minute
(between electric circuit and case)
♦ Insulation resistance 500 V DC, 100 MΩor 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.)
♦ Diameter of measurable 5 mm dia.
conductors
♦ Cord length Approx. 1.5 m
♦ External dimensions Approx. 175 (W X 40 (H) X 18
and mass (D) mm, approx. 170 g.
♦ Accessories Instruction manual, soft case
Chapter 4 Product Specifications
Page 31
)
Input impedance (m
Ω
)
Figure 1 Input Impedance
Frequency (Hz)
Figure 2 Maximum Input Range
)
)
e
Figure 3 Frequency Band (example of characteristics)
15
Frequency (Hz
Maximum input current (A rms)
Amplitud
mplitude
B,0dB=1V
Amplitude (dB, 0dB=1V)
Phase
Frequency (Hz
Chapter 4 Product Specifications
Phase (deg.)
Page 32
16
Chapter 4 Product Specifications
Page 33
Page 34
Page 35
Page 36
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