Hioki 9754 User manual

EN
9754
CLAMP ON NOISE SENSOR
Instruction Manual
May 2015 Revised edition 3
9754A981-03 15-05H

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Contents
Contents
Introduction ...............................................................1
Verifying Package Contents......................................1
Safety Information.....................................................2
Operating Precautions ..............................................4
Chapter 1 Overview 9
1.1 Product Overview........................................9
1.2 Names and Functions of Parts..................10
Chapter 2 Measurement 11
2.1 Measurement Procedure...........................13
2.2 Disconnecting the NOISE SENSOR .........15
2.3 When Connecting to Instruments other
than the 3145-20 .......................................16
Chapter 3 Specifications 19
Chapter 4 Maintenance and Service 23
4.1 Cleaning ....................................................23
4.2 Troubleshooting.........................................24
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9754A981-03

Contents
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Thank you for purchasing the HIOKI "Model 9754 CLAMP ON
NOISE SENSOR." To obtain maximum performance from the
instrument, please read this manual first, and keep it handy for
future reference.
This device is a sensor for use with a 3145-20 NOISE HiLOG-
GER. Please carefully read the instruction manual included with
the NOISE HiLOGGER and follow all safety precautions.
The 9754 CLAMP ON NOISE SENSOR can also be connected
to other waveform measuring equipment and used to monitor
waveforms and current. Be sure to read and follow all safety
precautions included in the instruction manual of whichever
measuring instrument you use.
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.
Package Contents
Introduction
Verifying Package Contents
Model 9754 CLAMP ON NOISE
SENSOR.......................... 1 Instruction Manual
...........................1

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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.
Safety Information
This instrument is designed to comply with
IEC 61010 Safety Standards, and has been
thoroughly tested for safety prior to ship-
ment. 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 precau-
tions in the manual before use. We disclaim
any responsibility for accidents or injuries not
resulting directly from instrument defects.
Safety Symbols
In the manual, the symbol indicates particularly
important information that the user should read
before using the instrument.
The symbol printed 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 that only insulated conductors suited to the
voltage of the circuit under test can be measured.
Indicates AC (Alternating Current).

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The following symbols in this manual indicate the relative impor-
tance of cautions and warnings.
The following symbols in this manual indicate the relative impor-
tance 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 instrument.
Indicates advisory items related to perfor-
mance or correct operation of the instrument.
Symbols for various standards
This symbol indicates that the product conforms to
regulations set out by the EC Directive.
Indicates the Waste Electrical and Electronic Equip-
ment Directive (WEEE Directive) in EU member
states.
Other Symbols
Indicates a prohibited action.
(p. ) Indicates the location of reference information.
*Indicates that descriptive information is provided
below.

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Before using the instrument 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.
Operating temperature and humidity: 0 to 40C (32 to 104F),
80%RH or less (no condensation)
Accuracy guarantee for temperature and humidity: 23 5C (73
9F), 80%RH or less (no condensation)
Operating Precautions
Preliminary Checks
Operating Environment
Avoid the following locations that could cause an accident or
damage to the instrument.
Exposed to di-
rect sunlight
Exposedto high
temperature
In the presence
of corrosive or
explosive gases
Exposed to liq-
uids
Exposedto high
humidity or con-
densation
Exposed to
strong electro-
magnetic fields
Near electro-
magnetic radia-
tors

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Exposed to high
levels of particu-
late dust Subject to vibra-
tion
Handling the Instrument
• To avoid damage to the instrument, protect it
from physical shock when transporting and han-
dling. Be especially careful to avoid physical
shock from dropping.Be especially careful to
avoid physical shock from dropping.
• Keep the clamp jaws and core slits free from for-
eign objects, which could interfere with clamping
action.
• Keep the clamp closed when not in use, to avoid
accumulating dust or dirt on the mating core sur-
faces, which could interfere with clamp perfor-
mance.
• To avoid breaking the cables, do not bend or pull
them.

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1.1 Product Overview
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This device is a current sensor for use with the 3145-20 NOISE
HiLOGGER. By simply clamping onto the conductor to be mea-
sured one can easily monitor noise current levels.
It can also be connected to the measuring instruments of other
waveform measuring equipment to monitor waveforms and cur-
rent levels.
Features
• Easy noise current measurement with a clamp
• Broad frequency bandwidth 1 kHz to 100 MHz (-3 dB)
Overview Chapter 1
1.1 Product Overview

1.2 Names and Functions of Parts
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1.2 Names and Functions of Parts
Front Panel
(1) Clamp
(3) Sensor head
(2) Slider
(4) BNC connector
(1) Clamp Clamps around the conductor to be mea-
sured.
(2) Slider Used to open and close the clamp. Always
use this slider when opening and closing the
clamp. When closing, push the slider all the
way until it clicks shut. This will lock the
clamp and keep it from opening.
(3) Sensor head This clamps the conductor being measured
and carries out the actual current measure-
ment. It is a precision assembled compo-
nent, including a molded section and ferrite
core. It may be damaged if subjected to sud-
den changes in ambient temperature, or
mechanical strain or shock, and therefore
great care should be exercised in handling it.
(4) BNC
Connector Outputs the current waveform of the conduc- tor being measured at a constant rate (0.1V/
A). Connect to the input terminal of the 3145-
20 NOISE HiLOGGER.

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1.2 Names and Functions of Parts
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This device cannot be used with exposed conductors, so please
use it with insulated conductors. Insulation must meet the
requirements of the measurement category, working voltage,
and pollution degree of the circuit being tested.
* Maximum continuous input range:
This range is based on heat that is internally generated during
sine wave input at a prescribed frequency at room tempera-
ture. It varies according to the frequency of the measured
current. (Use the 9754 CLAMP ON NOISE SENSOR at the
highest effective value within the maximum continuous input
range.) In addition to the maximum continuous input range,
there is also the "maximum peak current value 15 Apeak"
product specification. This indicates an upper waveform
response limit of 15 Apeak.
Measurement Chapter 2
• To avoid electrical shock, be careful not to
damage the insulation of the conductor
being measured.
• Do not measure around a bare conductor.
Doing so may result in short-circuit or elec-
tric shock. Take measurements at a loca-
tion on an insulated wire where there is
sufficient insulation for the circuit voltage.
To avoid electric shock when measuring live
lines, wear appropriate protective gear, such
as insulated rubber gloves, boots and a
safety helmet.
To avoid damaging the unit, do not apply current
that exceeds the maximum continuous input
range. (p.17)

1.2 Names and Functions of Parts
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• Acoustic resonance may occur depending on the
level and frequency of the measured current, but
this will not affect measurement unless a foreign
substance such as dust is present on the contact
surfaces of the sensor head.
• If there are high frequency elements included in
the measured current, it will generate high heat.
When taking measurements be cautious of the
sensor heating up.
• The output of this device is terminated inter-
nally. When connecting with a waveform mea-
suring instrument, use an instrument with an
input resistance of 1 Mor higher. Accurate
measurement cannot be made at 50 input
resistance.
• When monitoring high frequency waveform cur-
rent elements superimposed on direct current or
commercial frequency current, it is necessary to
pay attention to the following. Attenuation char-
acteristics in the low frequency area are affected
by direct current or commercial frequency current
levels. As the current level increases, magnetic
saturation of the sensor magnetic core causes a
decrease in amplitude and can generate wave-
form distortion. For example, with a sine wave
input of 15 Apeak, 15 kHz, product specifications
will not be met if the superimposed DC current
exceeds approximately 8 A. Input current levels
must be in accordance with " Derating according
to frequency" (p.19).
• When clamping together on the round-trip con-
ductors of a commercial circuit, position the two
conductors as close together as possible. The
output value is influenced by the position of the
conductors in the clamp opening. Even if the
round-trip current levels are equal, the clamp
sensor output value may not equal zero. If two
approximately 10 mm conductors are mea-
sured in the round-trip state, and the current
flowing in the conductors is 100 A (55 Hz), the
clamp output value may be approximately 50
mA.

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2.1 Measurement Procedure
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2.1 Measurement Procedure
1. Turn on the power of the instrument being
connected to the 9754 CLAMP ON NOISE
SENSOR.
2. Connect the BNC connector of the 9754 CLAMP
ON NOISE SENSOR to the input terminal of the
instrument being connected to.
3. Measurement settings are made on the instrument
being connected to.
Check the settings of the instrument being connected to.
4. Pull the slider on the sensor to open the clamp.
Turn until it clicks
Line up
Line up
(1)
(2)

2.1 Measurement Procedure
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5. Clamp the conductor to be measured and close the
clamp.
6. Press on the slider until it clicks to lock shut.
Press the sensor slider until the "UNLOCK" message dis-
appears and "LOCK" is displayed, and confirm that the
slider is firmly locked and the clamp securely closed.
7. Monitor noise current.
The output rate of this device is 0.1 V/A. When using a
general purpose waveform monitoring instrument, derive
the current sensitivity from the voltage sensitivity. For
example, if the waveform measurement instrument's volt-
age sensitivity is 100 mV/division, the current sensitivity
is 1 A/division.
Make sure that the cur-
rent direction indicator ar-
rowmatchesthe direction
of current flow on the con-
ductor being measured.
Make sure also that the
conductor is clamped in
the center of the clamp
opening.
Current
Current direction
indicator

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2.2 Disconnecting the NOISE SENSOR
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Do not place any unclamped
conductor with an electric cur-
rent of a frequency of 10 kHz
or more near the sensor head.
Current flowing in the conduc-
tor nearby may heat up the
sensor head and cause its
temperature to rise, leading to
damage to the sensor. For example, when one side
of a go-and-return conductor is clamped and the
other side is also placed near the sensor head as
shown in the diagram, even if the electric current is
lower than the consecutive maximum current, elec-
tric currents in both sides will heat up the wires and
raise the temperature, thereby causing damage to
the sensor.
2.2 Disconnecting the NOISE SENSOR
• To avoid damaging the device, always open the
clamp by using the slider.
• When disconnecting the BNC connector, be
sure to release the lock before pulling off the
connector. Forcibly pulling the connector without
releasing the lock, or pulling on the cable, can
damage the connector.
1. Pull the sensor slider to open the
clamp.
2. Remove the 9754 CLAMP ON NOISE
SENSOR from the conductor being
measured.
3. Turn off the power on the instrument
being connected to.

2.3 When Connecting to Instruments other than
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The 9754 CLAMP ON NOISE SENSOR can be
connected to waveform measuring equipment
other than the 3145-20 NOISE HiLOGGER and
used to monitor current waveforms. Please care-
fully read the instruction manual included with
whichever instrument you connect to and follow all
safety precautions.
2.3 When Connecting to Instruments
other than the 3145-20

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2.3 When Connecting to Instruments other than
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To avoid electrical shock, follow the precau-
tions below to ensure no dangerous voltage
from the power of the instrument being con-
nected to or its other measuring terminals
(those not connected to this device) is
impressed upon the 9754 CLAMP ON
NOISE SENSOR. If dangerous voltage is
impressed upon this device, dangerous volt-
age will be generated in its BNC connector
and inner circuitry, presenting an extreme
hazard.
• Only connect to instruments which are
constructed with double insulation and use
a protective earth.
• Confirm that basic insulation which meets
the measurement category, working volt-
age and pollution degree of the circuit
being tested, is used to isolate the other
measurement terminals of the instrument
being connected to.
If you are not sure basic insulation is used
between the terminals of the measurement
device, do not input voltage which exceeds
the Separated Extra-Low Voltage Earthed
(SELV-E) level into the other terminals of
the instrument.
• Observe all safety precautions of the
instrument you are using.
Refer to the following standards regarding
the meanings of underlined terms.
IEC 61010-1
IEC 61010-031
IEC 61010-2-032

2.3 When Connecting to Instruments other than
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<Examples>
• If connecting the 9754 CLAMP ON NOISE SENSOR to a mea-
suring instrument that does not provide isolation between its
input terminals and chassis or other input terminals, connect
the ground terminal to a ground potential. If it is connected to a
non-ground potential, voltage will be applied to the ground-side
terminal and chassis, and to the 9754 CLAMP ON NOISE SEN-
SOR, and can cause electrical shock, short circuits, or damage.
• If using BNC-banana plug or other adapters to
connect to input terminals other than BNC con-
nectors, make sure the polarity is correct.
• At high frequencies, common mode noise may
affect measurements taken on the high voltage
side of circuits. As necessary, either limit the fre-
quency range of the waveform measuring instru-
ment, or clamp onto the low-voltage side of the
circuit.