CT6700
CT6701
CURRENT PROBE
Instruction Manual
Nov. 2017 Revised edition 3
CT6700A981-03 17-11H
EN
Contents
Introduction .........................................................................1
Verifying Package Contents ..............................................1
Safety Notes ........................................................................ 2
Usage Notes ........................................................................ 5
1 Overview 23
1.1 Product Overview .......................................... 23
1.2 Features .........................................................24
1.3 Parts Names and Functions ......................... 25
1.4 MeasurementWorkow ................................ 30
2 Measurement Procedure 33
2.1 Inspection Before Use ..................................33
2.2 Preparation for Measurements ....................35
Connecting the device to the Power Supply ............. 35
Performing Demagnetizing and Zero-Adjustment .....37
2.3 Performing Measurements ........................... 41
3 Specications 45
3.1 ProductSpecications .................................45
3.2 Functions ....................................................... 54
4 Maintenance and Service 57
4.1 Troubleshooting ............................................58
4.2 Error ...............................................................61
4.3 Cleaning ......................................................... 63
4.4 Discarding the Device ................................... 64
CT6700A981-03
i
Contents
ii
Introduction
Introduction
Thank you for purchasing the HIOKI CT6700, CT6701 Current
Probe. To obtain maximum performance from the device,
please read this manual rst,and keep it handy for future
reference.
Verifying Package Contents
When you receive the device, inspect it carefully to ensure
that no damage occurred during shipping. In particular,
check the accessories , panel keys, and connectors. If
damage is evident, or if it fails to operate according to the
specications, contact your dealer or Hioki representative.
Check the package contents as follows.
CT6700, CT6701 Current Probe
Precautions during shipment
• Use the original packing materials when transporting the
device, if possible.
• Transport the device in its carrying case.
Options (sold separately)
The following options are available for the device. Contact
your authorized Hioki distributor or reseller when ordering.
• Model 3269 Power Supply
• Model 3272 Power Supply
Carrying Case
Instruction Manual
(The product ships with
the current probe and
instruction manual stored
in the carrying case.)
1
Safety Notes
Safety Notes
This device is designed to conform to IEC 61010 Safety
Standards, and has been thoroughly tested for safety prior to
shipment. However, using the device in a way not described
in this manual may negate the provided safety features.
Before using the device, be certain to carefully read the
following safety notes.
DANGER
Mishandling during use could result in injury
or death, as well as damage to the device. Be
certain that you understand the instructions and
precautions in the manual before use.
WARNING
With regard to the electricity supply, there are
risks of electric shock, heat generation, re, and
arc discharge due to short circuits. If persons
unfamiliar with electricity measuring device are
to use the device, another person familiar with
such devices must supervise operations.
2
Safety Notes
Notation
In this manual, the risk seriousness and the hazard levels
are classied as follows.
Indicates an imminently hazardous situation
DANGER
WARNING
CAUTION
IMPORTANT
that will result in death or serious injury to
the operator.
Indicates a potentially hazardous situation
that may result in death or serious injury to
the operator.
Indicates a potentially hazardous situation
that may result in minor or moderate injury
to the operator or damage to the device or
malfunction.
Indicates information related to the operation
of the device or maintenance tasks with
which the operators must be fully familiar.
Indicates a high voltage hazard.
If a particular safety check is not performed
or the device is mishandled, this may give
rise to a hazardous situation; the operator
may receive an electric shock, may get burnt
or may even be fatally injured.
*
Bold
Indicates prohibited actions.
Indicates the action which must be
performed.
Additional information is presented below.
Device’s keys are indicated in boldface.
3
Safety Notes
Symbols afxed to the device
Indicates cautions and hazards. When the symbol is
printed on the device, refer to a corresponding topic in
the Instruction Manual.
Indicates that only insulated conductors suited to the
voltage of the circuit under test can be measured.
Symbols for various standards
WEEE marking:
This symbol indicates that the electrical and electronic
appliance is put on the EU market after August 13, 2005,
and producers of the Member States are required to
display it on the appliance under Article 11.2 of Directive
2002/96/EC (WEEE).
Indicates that the product conforms to regulations set
out by the EU Directive.
Accuracy
We dene measurement tolerances in terms of rdg. (reading)
with the following meanings:
rdg. (reading or displayed value)
rdg.
The value currently being measured and indicated
on the measuring device.
4
Usage Notes
Usage Notes
Follow these precautions to ensure safe operation and to
obtain the full benets of the various functions.
DANGER
To avoid electric shock, do not remove the
device's cover. The internal components of the
device carry high voltages and may become
very hot during operation.
WARNING
• Before using the device, make sure that the
insulation on the cord is undamaged and that
no bare conductors are improperly exposed.
Using the device in such conditions could
cause an electric shock, so contact your
dealer or Hioki representative for repair.
• Before using the device, Verify that it operates
normally to ensure that no damage occurred
during storage or shipping. If you nd
any damage, contact your dealer or Hioki
representative.
CAUTION
Be careful to avoid dropping the device or otherwise
subjecting them to mechanical shock, which
could damage the facing surfaces of the core and
adversely affect measurement.
5
Usage Notes
Installation
For details on the operating temperature and humidity, see the “3
Specications” (p. 45).
WARNING
• Avoid the following locations that could cause
an accident, re, or damage to the device.
• Exposed to direct sunlight or high
temperature
• Exposed to corrosive or combustible gases
• Exposed to water, oil, chemicals, or solvents
• Exposed to high humidity or condensation
• Exposed to a strong electromagnetic eld
or electrostatic charge
• Exposed to high quantities of dust particles
• Near induction heating systems (such as
high-frequency induction heating systems
and IH cooking equipment)
• Susceptible to vibration
• Located near a device that uses high-
frequency power
Avoid obstructing the ventilation holes on the sides
and bottom of the terminator (p. 25), as it could
overheat and be damaged, or cause a re.
CAUTION
• Do not place the device on an unstable table or
an inclined place. Dropping or knocking down the
device can cause injury or damage to the device.
6
Usage Notes
Precautions during preparation for measurements
WARNING
To avoid shock and short circuits, turn off all
power before connecting the device.
CAUTION
• Before turning on the power, make sure that the
voltage of the power supply being used matches
the supply voltage indicated on the rear panel of
optional Model 3269 or Model 3272 Power Supply.
• Check that the conductor being measured is not
clamped when supplying power to the device. A
demagnetizing waveform may be generated when
power is supplied, causing damage to components
connected to the circuit being measured.
• To avoid terminator (p. 25) damage, keep it
oriented in a straight line relative to the waveform
measurement instrument when connecting and
disconnecting it.
• To avoid damaging the output connector, pull
the unlock lever toward you and then pull the
connector out and away from the waveform
measurement instrument.
7
Usage Notes
CAUTION
• When connecting an input connector other than
a BNC connector, for example a conversion
plug, do so such that the BNC center conductor
is positive and other metallic parts are ground
potential (or negative).
Reference
• Device output is terminated internally. Since the output
resistance is 50
waveform measurement instrument (oscilloscope,
recorder, etc.) that has an input impedance of at least
1 M
. Accurate measurement is not possible with
Ω
waveform measurement instruments that have an input
resistance of 50
• An AC voltage waveform may appear in the output
under certain circumstances, even under conditions
of no input, if the device is connected to the 3269 or
the 3272 Power Supply while the power supply is on.
This does not indicate a malfunction. The AC voltage
waveform that appeared in the output will disappear,
and operation restored to normal by opening and closing
the sensor head.
, the device must be used with a
Ω
.
Ω
8
Usage Notes
Reducing the impact of offset drift*
• Wait at least 30 minutes after turning on the device
before making measurements. Offset drift may increase
immediately after power is supplied to the probe due to
self-heating and other factors.
• Offset drift will occur when the ambient temperature
changes or when the device is used to make continuous
measurements over an extended period of time, causing
measured values to include an error component. Perform
demagnetization and zero-adjustment as necessary.
*A phenomenon whereby the magnitude of the zero point error
component (offset voltage) varies over time.
9
Usage Notes
Precautions during measurement
DANGER
• Do not measure around a bare conductor.
Doing so may result in short-circuit or electric
shock. Take measurements at a location on
an insulated wire where there is sufcient
insulation for the circuit voltage.
• Refer to the derating characteristics when
measuring current that includes a high-
frequency component and never measure
any current that exceeds the rated current.
Use with high frequencies or strong magnetic
elds may cause the device to become
abnormally hot, resulting in re, equipment
damage, or burns. (See “3 Specications”
(p. 45).)
• Observe the following to avoid electric shock
and short circuits.
• Connect the device to the 3269 or the 3272
Power Supply and waveform measurement
instrument (oscilloscope or recorder) rst,
and then to the active lines to be measured.
•
When the sensor is opened, do not shortcircuit the conductor being measured or other
two wires with the metal part of the tip.
10
Usage Notes
DANGER
• When using a measurement instrument that
does not provide isolation between its input
terminals and chassis or other input terminals,
please pay attention to the following points.
The device’s reference potential is the ground
potential. Do not apply a different potential
to the ground side of other input connectors.
Otherwise, short-circuit current will ow
through the 3269, or the 3272 or this device
from the ground terminal, which could cause
an electrical accident or damage.
H L
Power
Source
Load
Load
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Usage Notes
DANGER
• To prevent re or damage of the measurement
target and device as well as burns, exercise
caution concerning the following when
measuring high-frequency currents or
currents that contain high-frequency
components:
• Eddy current loss may cause heating of the
sensor head.
• Dielectric heating may cause heating of
cord insulation and other materials.
• Be sure to observe all operating precautions
for the waveform measurement instrument
and other measurement instruments to which
this device is connected.
• This device 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 ow could cause a
serious accident if a short circuit occurs.
• Before clamping the conductor being
measured, make sure that the insulation on
the conductor is undamaged. Also, take care
not to damage the insulation when clamping
the conductor. Any damage to the insulation
could cause an electric shock.
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Usage Notes
WARNING
• Do not press and hold the DEMAG/AUTO
ZERO key to perform demagnetization while
the conductor being measured is clamped.
Doing so could damage the circuitry or cause
an accident that might result in injury or
death.
Demagnetizing
Conductor
• Ensure that the input does not exceed the
maximum rated current to avoid device
damage, shortcircuiting and electric shock
resulting from heat building.
13
Usage Notes
CAUTION
• To avoid damage to the output connector on
the terminator or the BNC input terminal’s
locking mechanism on the waveform measuring
instrument, do not rotate with both terminals
connected. Additionally, exercise care to ensure
that connections are not subject to stress.
• Do not place foreign objects between the
mating faces of the sensor head, insert foreign
objects into the gaps of the sensor head, or
touch the mating faces. Doing so may worsen
the performances of the sensor or interfere with
clamping action.
• Do not apply a static electricity or other source of
high voltage to the sensor. Doing so may damage
its internal Hall elements and circuitry.
• Do not short-circuit the output terminal and do not
input voltage to the output terminal. The device
may be damaged.
• Note that the device may be damaged if the
applied current exceeds the measurement range.
14
Usage Notes
CAUTION
• When the 3269, 3272 Power Supply or waveform
measurement instrument’s power is turned off,
do not apply current to the device. Doing so may
damage the device, the 3269, 3272 Power Supply
and/or waveform measurement instrument.
• Do not place any unclamped conductor with
an electric current of a frequency of 10 kHz or
more near the sensor head. Current owing in
the conductor nearby may heat up the sensor
head and cause its temperature to rise, leading
to damage to the device. 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 maximum rated current,
electric currents in both sides will heat up the
wires and raise the temperature, thereby causing
damage to the device.
• The maximum rated current 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 device.
15
Usage Notes
CAUTION
• The device may sustain damage from self-heating
even at current levels that are lower than the
maximum current value dened by the maximum
rated current.
The maximum rated current is a recommended
value that assumes sine-wave input under
standard conditions. Self-heating may increase
if the ambient temperature increases or the
measurement current waveform contains other
frequency components. Refer to the derating
characteristics in the product specications
(p. 50).
• The product specications that indicate the
maximum input range include a maximum peak
current value of ±7.5 A peak (non-continuous) in
addition to the maximum rated current. This value
constitutes an absolute upper limit that must
never be exceeded, even momentarily. Always
use the device within the specied range in order
to avoid damaging it.
• The detection frequency band for overload
warnings is DC and 45 to 66 Hz (sine wave).
When measuring currents that are outside the
detection frequency band, the overload warning
function may not operate. Under such conditions,
exercise caution so as not to exceed the
maximum rated current, regardless of whether the
OVERLOAD LED is ashing.
16
Usage Notes
CAUTION
• When opening the sensor head, always operate
the opening lever. Subjecting the sensor head
to force from the directions shown in the gure
while it is locked may damage the clamping
mechanism.
Do not
push
• Keep the sensor head closed when not in use,
to avoid accumulating dust or dirt on the facing
core surfaces, which could interfere with clamp
performance.
• The sensor head is a precision assembly
including a molded component, a ferrite core,
and a Hall effect element. To prevent damage,
avoid abrupt temperature changes, mechanical
shock, static electricity, and other problematic
phenomena.
• The matching surfaces of the sensor head are
precisely ground, and should be treated with care.
If these surfaces are scratched, performance may
be impaired.
• Lock the sensor head while the POWER LED is
on (except when clamping the conductor being
measured). Leaving the sensor head open may
damage the device.
Opening lever:
Sensor head in the locked state
17
Usage Notes
CAUTION
• Inputting a current in excess of the maximum
rated current* can cause heating of the device,
resulting in device damage, a short-circuit, or
electric shock. Remove the device from the
conductor being measured immediately. The
device must be allowed to cool adequately before
resuming normal use.
*: The maximum rated current varies according to the frequency of
the current being measured. See the gures as follows:
“Fig.3 Derating according to frequency (CT6700)” (p. 50),
“Fig.4 Derating according to frequency (CT6701)” (p. 50)
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