HEAD OFFICE
September 2006 Revised edition 4 Printed in Japan
9657BA981-04 06-09H
9657-10
CLAMP ON LEAK SENSOR
INSTRUCTION MANUAL
81 Koizumi, Ueda, Nagano 386-1192, Japan
TEL +81-268-28-0562 / FAX +81-268-28-0568
E-mail: os-com@hioki.co.jp URL http://www.hioki.co.jp/
HIOKI USA CORPORATION
6 Corporate Drive, Cranbury, NJ 08512, USA
TEL +1-609-409-9109 / FAX +1-609-409-9108
Introduction
Thank you for purchasing the HIOKI “9657-10 CLAMP ON
LEAK SENSOR”.
To obtain maximum performance from
the product, please read this 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. If damage
is evident, or if it fails to operate according to the specifications, contact your dealer or HIOKI repr esentative.
Preliminary Check
• Before using the product the first time, ver ify 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 re presentative.
• Before using the product, make sure that the insulation
on the cables is undamaged and that no bare conductors are improperly exposed. Using the product in such
conditions could cause an electric shock, so contact
your dealer or Hioki representative for repair.
Maintenance and Service
• To clean the product, wipe it gently with a soft cloth
moistened with water or mild detergent. Never use solvents such as benzene, alcohol, acetone, ether,
ketones, thinners or gasoline, as they can deform and
discolor the case.
• If the product seems to be malfunctioning, confirm that
the cables are not open circuited before contacting your
dealer or Hioki representative. When sending the product for repai r, pack the product car efull y so that it will not
be damaged during shipment, and include a detailed
written description of the problem. Hioki cannot be
responsible for damage that occurs during shipment.
Overview
The 9657-10 is a voltage output type clamp on sensor
compatible to 10A AC measur ements. The instrument can
be relied upon to measure subtle current with great accuracy due to the high magnetic permeability material used
for the core and magnetic shield.
Specifications
Accuracy is guaranteed for one year at 23±5°C (73±9°F)
and Max. 80% RH. (Opening and Closing of the Sensor:
Maximum 10000 times)
Rated current 10 A AC
Output voltage 100 mV AC/A
Amplitude accuracy
Phase accuracy within ±3°(at 50Hz, 60Hz, MeasureMaximum input current 30A continuous at 45 to 60Hz
Effect of conductor
position
Effect of external
magnetic fields
Remaining electric
current character
Dielectric strength 3536 Vrms for 15 seconds
Maximum rated voltage
to earth
Operating temperature
and humidity range
Storage temperature and
humidity range
Location for use Altitude up to 2000 m (6562 feet),
Standards applying
Safety
Diameter of measurable
conductor
Cable length Approx. 3 m (118.11")
External dimensions Approx. 74W x 145H x 42D mm
Mass Approx. 380 g (12.2 oz.)
Accessories Instruction manual: 1
We define measurement tolerances in terms of f.s. (full scale)
and rdg.(reading) values, with the following meanings:
• f.s. (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.
• rdg. (reading or displayed value)
The value currently being measured and indicated on the
measuring product.
±1.0% rdg.±0.05% f.s. (f.s.: 10A)
(at the clamp core center, 45 to 66
Hz)
ment current: Min. 1A)
(Ambient temperature: 50°C
±0.1%
within
(in any direction from sensor center)
400 A AC/m corresponds to 5 mA,
Max. 7.5 mA
Max. 5 mA
(in 100 A go and return electric wire)
(between clamp window and case)
Max. 300 Vrms
(Insulated conductor)
0 to 50°C (32 to 122°F)
Max. 80%RH (no condensation)
-10 to 60°C (14 to 140°F)
Max. 80%RH (no condensation)
Indoors
EMC
EN 61326:1997+A1:1998+A2:2001
+A3:2003
EN 61010-2-032:2002
Type B current sensor
Measurement Category III, Pollution
Degree 2 (anticipated transient
overvoltage 4000 V)
Within φ 40 mm (1.57")
2.91"W x 5.71"H x 1.65"D
(excluding protrusions)
)
Safety
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 coul d r esu lt in injury or death, as we ll as
damage to the product. Be certain that you understand the instructio ns and precautions in th e manual before use. We disclaim any responsibility for
accidents or injuries not resulting directly from
product defects.
Measurement categories (Overvoltag categories)
This product complies with CATIII safety requirements.
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: Secondary electrical circuits connected to an AC
electrical outlet through a transformer or similar
device.
CAT II: Primary electrical circuits in equipment connected
to an AC electrical outlet by a power cord (por table
tools, household appliances, etc.)
CAT III:Primary electrical circuits of heavy equipment
(fixed installati ons) connected directly to the dist ribution panel, and feeders from the distribution
panel to outlets.
CA T IV :The circ uit from the serv ice drop to th e service en-
trance, and to the power meter and primary over-
current protection device (distribution panel).
Higher-numbered categories correspond to electrical environments with greater momentary energy. So a measurement device designed for CAT III environments can
endure greater momentary energy than a device designe d
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.
Safety Symbol
In the manual, the symbol indicates particularly
important information that the user shoul d 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 AC (Alternating Cur rent) .
Wear appropriate protective insulation (insulating
rubber gloves and boots, helmet and etc.) when connecting and disconnecting from live electric circuits.
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.
Usage Notes
Follow these precautions to ensure safe operation and to
obtain the full benefits of the various functions.
Connect the CLAMP ON LEAK SENSOR to
the product first, and then to the active lines
to be measured.
Observe the following to av oid electric sh ock
and short circuits.
• When conductors being measured carry in
excess of the safe voltage level (SELV-E)
and not more than 300 V, to prevent short
circuits and electric shock while the clamp
core jaw is open, make sure that conduct ors
to be measured ar e insulated with material
conforming to (1) Overvoltage Category III,
(2) Pollution Degree 2, and (3) Basic Insulation Requirements for Working Voltages of
300 V.
Refer to the following standards regarding
the meanings of underlined terms.
IEC 61010-1
IEC 61010-2-03 1
IEC 61010-2-03 2
• To avoid short circuits and potentially lifethreatening hazards, never attach the product to a circuit that operates at more than
300 V rms, or over bare conductors.
• When the clamp sensor is opened, do not
allow the metal part of the clamp to touch
any exposed metal, or to short between two
lines, and do not use over bare conductors.
2. Leak Current Measurement
• This product should only be connected to the sec-
OK
Line
SOURCE
LOAD
Current direction
arrow in the
direction of the loa d.
Single-phase 3-lead circuits
Clamp all three leads
of the circuit
b
b
a
Load
Device
lg
Transformer
E (PE)
lg: Leak Current
Three-phase 3-lead circuits
Clamp all three leads
of the circuit
lg
a
b
b
a
E (PE)
PE
Load
Device
Single-phase 3-lead circuits
bb’
a
c
c’
Load
Device
B
A
lg
Load
Device
E (PE)
Clamp core
Barrier
Cable
Ferrite core
BNC
connector
ondary side of a breaker, so the breaker can prevent an accident if a short circuit occurs.
Connections should never be made to the primary side of a breaker, because unrestricted current flow could cause a serious accident if a short
circuit occurs.
• To avoid electric sho ck, do not touch the port ion
beyond the protective barrier during use.
Measurement Procedure
• When disconnecting the BNC connector, be sure to release the lock before pull ing of f t he connector. Forcibly
pulling the connector without re leasing the lock, or pulling on the cable, can damage the connector.
• To prevent damage to the product and sensor, never
connect or disconnect a sensor while the power is on,
or while the sensor is clamped around a conductor.
1. Load Current Measurement
Connections method
Clamp the tester on the conductor, so that the conductor
passes through the center of the clamp core. For measurement of grounded leads, clamp the tester on one lea d
only (see a). For overall measurements, clamp the tester
on the entire circuit path (see b).
1.If an insulation fault in the wiring has occurred at
position A in the i l lustr ation, leak curr ent will b e detect ed
at position b using overall measurement, but not at
position b'.
2.If an insulation fault in the load equipment has occurred
at position B in the illustration, leak current will be
detected at position c using overall measurement, but
not at position c'.
3.For detection of intermittent leak current conditions
(such as only when a certain piece of equipment is
operating), the use of a level recorder will be helpful.
• To avoid electric shock, do not allow the product to
get wet, and do not us e it when yo ur hand s are wet.
• To avoid electric shock when measuring live lines,
wear appropriate protective gear, such as insulated rubber gl oves, boots and a safety he lmet.
• To avoid electric shock when measuring the
ground conductor on a transformer Class 2 connection site, be careful not to approach high voltage devices or conductors. Also, if close to high
voltage charging devi ces or if mea suremen t is o therwise difficult, first change the route of the
grounding wir e.
• Do not store or use the product where it could be exposed to direct sunlight, high temperature or humidity,
or condensation. Under such conditions, the product
may be damaged and insulation may deteriorate so
that it no longer meets specifications.
• To avoid damage to the product, protect it from vibration or shock during trans port and handling, and be especially careful to avoid dropping.
• Be careful to avoid dropping the product or otherwise
subjecting them to mechanical shock, which could
damage the mating 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.
• Keep the clamp closed when not in use, to avoid accumulating dust or dirt on the mating core surfaces,
which could interfere with clamp performance.
• Measurements are degraded by dirt on t he mating surfaces of the clamp-on sensor, so keep the surfaces
clean by gently wiping with a soft cloth.
• This product is not designed to be entirely water- or
dust-proof. To avoid damage, do not use it in a wet or
dusty environment.
• This product is designed for indoor use, and operates
reliably from 0°C to 50°C.
• This product should be installed and operated indoors
only, between 0 and 50°C and 80% RH or less
• Avoid stepping on or pinching the cable, which could
damage the cable insulation.
• Keep the cables well away from heat sources, as bare
conductors could be exposed if the insulation melts.
• To avoid damaging the sensor cable, do not bend or
pull the cable.
• Note that the product may be damaged if current exceeding the selected measurement range is appl ied for
a long time
Attach the clamp around only one conductor. Single-phase (2-wire) or
three-phase (3-wire) cables clamped together will not produce any
reading.
When making the phases of the measurement current and
output voltage the same, clamp the jaws of the sensor
onto the conductor so that the current direction on the
clamp points in the direction of the load, and so that the
conductor is approximately centered between the jaws.
Make sure that the tips of jaws are fully closed.
• Align the BNC connector with the connec tor gui de notch
on the current input connector. While pushing the connector in, turn it to the right to lock it.
• Open the jaws, and clamp the sensor onto the conductor.
• Make sure that the tips of jaws are fully closed.
Parts Names
• For measurement of single-phase 2-lead circuits, clamp both leads
of the circuit.
• For measurement of three-p has e 4 -lea d c irc uits, clamp all four leads
of the circuit. If this is not possible, the measurement can also be
carried out on the ground lead of the equipment.
• If a strong current (on the order of 100 A) is flowing in an adjacent
circuit, accurate measurement may not be possible. Perform the
measurement at a sufficient distance from other current-carrying
conductors.
• The frequency of special waveforms such as at the secondary side
of an inverter may not be indicated correctly.
• Do not input a current which exceeds the rated current.
Checking for insulation faults
Normally , for a E(PE) grounding i nstallation of a transf ormer, the measu rement will fi rst be made to check f or ov erall
circuit leak current in the grou nd lead (a). Current changes
can be used to diagnose the leak current condition.
When leak current has been detected, the measurement
should proceed from the power source towards the load,
using overall measurement.
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