Thank you for purchasing the HIOKI "9279
UNIVERSAL CLAMP ON CT". 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. In particular, check the
accessories. 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 product 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.
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
This product is designed to conform to IEC 348
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 product. 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.
Safety symbols
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.
Thesymbol printed on the product indicates
that the user should refer to a corresponding
topic in the manual (marked with the
before using the relevant function.
In the manual, thesymbol indicates
particularly important information that the user
should read before using the product.
The specifications in this manual include figures
for "measurement accuracy" when referring to
digital measuring instruments, and for
"measurement tolerance" when referring to
analog instruments.
f.s.(maximum display or scale value, or length of
scale)
Signifies the maximum display (scale) value or the
length of the scale (in cases where the scale
consists of unequal increments or where the
maximum value cannot be defined).
In general, this is the range value (the value
written on the range selector or equivalent)
currently in use.
rdg.(displayed or indicated value)
This signifies the value actually being measured,
i.e., the value that is currently indicated or
displayed by the measuring instrument.
Follow these precautions to ensure safe
operation and to obtain the full benefits of the
various functions.
DANGER
To avoid short circuits and potentially lifethreatening hazards, never attach the
UNIVERSAL CLAMP ON CT to a circuit that
operates at more than the 600 Vrms, or over
bare conductors.
UNIVERSAL CLAMP ON CT should only be
connected to the secondary 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.
WARNING
To avoid electric shock, do not allow the
product to get wet, and do not use it when your
hands are wet.
To avoid electric shock when measuring live
lines, wear appropriate protective gear, such as
insulated rubber gloves, boots and a safety
helmet.
Note that the product may be damaged if current
exceeding the selected measurement range is
applied for a long time
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 transport and handling,
and be especially careful to avoid dropping.
Measurements are degraded by dirt on the mating
surfaces of the clamp-on sensor, so keep the
surfaces clean by gently wiping with a soft cloth.
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 cables, do not bend or pull
the cables.
This product should be installed and operated
indoors only, between 0 and 40
be safely operated down to -10
. However, it can
.
When measuring the high-frequency large current,
over-heating of the core may occur. Note that the
input never exceed the maximum permissible input
range. See the figures in Chapter 3,"Specifications".
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.
The 9279 was developed for to provide a 500 A
clamp sensor corresponding to AC/DC current.
The 9279 makes it possible to measure AC/DC
current in live power lines without cutting into
the lines. The sensor features good frequency
response (amplitude and phase), good
temperature response (sensitivity and offset),
and dielectric strength and is easy to connect
and use. Its versatility will find application in a
wide variety of fields dealing with current and
power measurement.
To avoid damaging the output cable, grasp the
connector, not the cable, when unplugging the cable.
To prevent damage to the product and sensor, never
connect or disconnect a sensor while the power is on.
The maximum continuous input range is based on heat
that is internally generated during measurement. Never
input current in excess of this level. Exceeding the
rated level may result in damage to the cable.
The maximum continuous input range varies according
to the frequency of the current being measured. See
the figures in Chapter 3, "Specifications"
To measure small current levels, multiple
windings may be used to increase the relative
sensitivity. 10 windings multiplies the
measured current by about a factor of 10.
However, in this case the diameter of the
winding should be 20 cm or more, and radial.
This product has a resistance in series with the
signal output circuits. Therefore, if measuring
an output signal directly, ensure that the input
resistance of the measuring instrument is
sufficiently high.
1. Close the clamp jaws when
the clamp jaws are opened.
2. Make sure that the unit's
power switch is OFF.
3. Connect the clamp-on CT
connector to the unit.
4. Turning the power on the unit.
5. Press the DMAG switch to
magnetize.
(See 2.2 Demagnetizing
(DMAG))
6. Lightly press the lever and
spread the tips of the clamp
with both hands.
7. Align the sensor so that the
Current direction
indication
current direction indication
corresponds to the direction
of current flow through the
conductor to be measured,
and clamp so that the
conductor is in the center of
the sensor aperture.
NOTE
Grip the clamp lightly so that the lever snaps
securely shut. At that time, avoid to subjecting
the facing surface of the core to shock.
Make sure that only one conductor is in the
core. Single-phase (2-wire) and three-phase
(3-wire) lines clamped together will not produce
reading.
After measuring rush current or similar of AC or
DC current measurement, micro voltage is
output even if there is no input on the clamp.
This is caused by the core characteristic using
the clamp and magnetic is remained in the
core. This remanent cause measuring error, but
it can be removed by pressing DMAG with no
input onto the clamp.
NOTE
After powering on, press DMAG.
It is possible to magnetize even if pressing
DMAG during input.
Always make sure that the clamp jaws are
completely closed during demagnetising.
Demagnetization occurs for about 3 seconds.
If an excessive amount of current was input so
that one attempt at demagnetization does not
completely rid of the remanence, open the
clamp jaws and press DMAG, then close the
clamps, and press DMAG again.
In case of closing the clamp and if the facing
surface of the core is subjected to shock,
offset maybe output. In this case, press the
DMAG switch with no input on the clamp.
When measuring DC current and applying
exceed continuous the maximum permissible
input, the malfunction may occur. Press the
DMAG switch with no input on the clamp, to
return to normal.
If it does not return to normal condition, or
even pressing DMAG, the magnetic is
remained in the core, contact your dealer or
Hioki re
Be careful to avoid connecting voltage improperly,
as the internal circuitry may be destroyed.
The capacity of the power supply is at least0.5 A.
Demagnetization occurs after pin 7 is shorted to
ground and then opened.
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.
4.2 Service
If the product seems to be malfunctioning,
contact your dealer or Hioki representative.
Pack the product carefully 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.