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CT6700
CT6701
CURRENT PROBE
Instruction Manual
Nov. 2017 Revised edition 3
CT6700A981-03 17-11H
EN
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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
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Contents
ii
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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.)
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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.
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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.
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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.
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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.
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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.
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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.
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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
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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.
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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.
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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.
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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.
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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.
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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.
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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
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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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Usage Notes
Reference
• When using the device, note that two current sensors
may not be used simultaneously with the 3272 Power
Supply, depending on the current to be measured.
• The current consumption of the device depends on the
current to be measured. Conrm that the total current
consumption of the device does not exceed the rated
output current of the 3272. When using the 3272,
conrm that the total current consumption of the device
does not exceed the rated output current of the 3272.
250
200
150
Current consumption(mA)
100
0 1 2 3 4 5
Current value being measured (A)
Current consumption* vs. current to be measured (typical)
*The sum total of a positive and negative current consumption
AC (f=50 Hz)
DC
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Usage Notes
Reference
• To measure DC or low-frequency current, multiple
windings may be used to increase relative sensitivity (10
windings multiplies the measured current by a factor
of 10). However, in this case, the windings should be
made radially, with a diameter of at least 20 cm.
Wind radially
20 cm or more
φ
• The measurement may be affected by the position
within the sensor aperture of the conductor being
measured. The conductor should be in the center of
the sensor aperture, and the straight portion should be
as long as possible. Avoid positioning the conductor so
that it is wound locally around the sensor head.
• To facilitate accurate measurement, press the opening
lever until the JAW UNLOCKED indicator turns off
before making a measurement to ensure that the
sensor head is securely closed and locked.
• Cord placement and the act of clamping the probe
onto the conductor being measured may trigger load
uctuations, affecting the observed waveform.
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Usage Notes
Reference
• At high frequencies, common mode noise may affect
measurements taken on the high voltage side of
circuits. If this occurs, reduce the frequency range of
the waveform measurement instrument, or clamp onto
the low-voltage side of the circuit, as appropriate.
H
Power
source
Load
L
OK
• Depending on the amplitude and frequency of the
current being measured, the sensor head may emit
a resonant sound. This sound may also occur during
demagnetizing operation, but it does not represent a
malfunction (device failure).
• If foreign matter becomes adhered to the facing
surfaces on the sensor head so that a slight gap exists
between the upper and lower sensors, the sensor head
may emit a resonant sound. Any foreign matter should
be removed using the cleaning method described in this
manual (see “4.3 Cleaning” (p. 63)).
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Usage Notes
Reference
• An increase in the volume of the resonant sound during
use may indicate that the gap between the upper and
lower sensors has increased in size. Since the sensor
characteristics may change, it is recommended to calibrate
the device (see “4 Maintenance and Service” (p. 57)).
Precautions after measurement
CAUTION
• To prevent wire breaks, do not pull on the cord
to disconnect the output connector from the
waveform measurement instrument. Always grip
the terminator and pull the unlock lever toward
you before disconnecting the connector.
• Observe the following precautions when
disconnecting the device in order to prevent wiring
breaks in the device’s power cord or damage to
the 3269 or 3272 Power Supply receptacle:
• Grip the power supply plug’s shell (p. 25)
when disconnecting it.
• Do not pull on cords to disconnect them or
twist the power supply plug. (Pulling on the
power supply plug’s shell causes the lock to be
released so that it can be disconnected from
the power supply receptacle.)
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Product Overview
Overview
1
1.1 Product Overview
This device can be directly connected to a BNC input
connector of a waveform measurement instrument such as an
oscilloscope or recorder, and by clamping on a conductor being
measured, allows the current waveform to be easily captured.
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Features
1.2 Features
• The sensor head*1 has a clamp design that makes it
possible to easily observe current waveforms while current
continues to ow through the conductor being measured.
• The sensor head features a sliding opening and closing
mechanism
• The terminator’s*3 output connector can be easily
connected to a waveform measurement instrument simply
by plugging it in
• The terminator’s output connector can be connected
when the locking pin on the waveform measurement
instrument’s BNC input connector is in either the horizontal
or vertical orientation
• LED warnings are displayed when an overload occurs and
when the sensor head is unlocked.
• You can observe low-current waveforms at the high
sensitivity of 1 V/A.
• Broadband frequency characteristics
CT6700: DC to 50 MHz
CT6701: DC to 120 MHz
• Demagnetization and zero-adjustment functions make it
easy to get ready for measurement.
*
2
that is easy to operate.
*4
.
*4
.
*6
*
5
*6
*
7
*1: See “Sensor” (p. 26)
*2: See Procedure 2 (p. 41)
*3: See “Terminator” (p. 25)
*4: See Procedure 3 (p. 39)
*5: See “Key and LEDs” (p. 28)
*6: See “3 Specications” (p. 45)
*7: See “Performing Demagnetizing and Zero-Adjustment” (p. 37)
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Parts Names and Functions
1.3 Parts Names and Functions
Terminator
Output connector
The current waveform of the measured conductor is output at a
constant rate (1 V/A).
Connect to the BNC input connector of the waveform
measurement instrument.
See p. 7 and p. 14.
Unlock lever
The output
connector can be
disconnected by
pulling this part
toward you.
Key and LEDs
(p. 28)
See p. 10.
Power plug
Connect this to the 3269 or the 3272 Power Supply to supply
power to the sensor terminator.
Ventilation holes
Upper
side
Power supply cord
Side
Shell
Bottom side
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Parts Names and Functions
Sensor
Current direction
indication
Clamp the device
to the conductor so
that the direction in
which the current
being measured
is owing matches
the arrow.
JAW UNLOCKED
indication
If you can see
this indication, the
sensor head is
unlocked.
Opening lever
Operating lever for
opening the sensor
head. Always use
this lever to open
the sensor head.
See p. 10.
Upper
side
Sensor aperture
Sensor head
This clamps the
conductor being
measured, and
carries out the
actual current
measurement.
Side
Sensor cord
Jaw
Current
direction
indication
Bottom
side
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Parts Names and Functions
CAUTION
• To prevent sensor head damage, avoid abrupt
temperature changes, stress, mechanical
shock, application of static electricity, and other
problematic phenomena.
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Parts Names and Functions
Key and LEDs
The key is used to perform demagnetization and zeroadjustment, while the LEDs indicate the device status.
DEMAG/AUTO ZERO LED
Slow ashing orange:
Before demagnetization and zeroadjustment (when either can be performed),
after an overload is detected, and when
demagnetization could not be completed
successfully
Lit up continuously, orange:
During demagnetization and zero-adjustment
Off:
After demagnetization and zero-adjustment
JAW UNLOCKED LED
Lit up continuously, red:
When the sensor head
is unlocked
POWER LED
Lit up continuously,
green: When energized
OVERLOAD LED
Slow ashing red: There is no margin remaining until the
maximum rated current.
Exercise care so as not to exceed the rating.
Fast ashing red: The rating is being exceeded.
Remove the sensor from the measurement
target immediately.
DEMAG/AUTO
ZERO key (p. 37)
Performs
demagnetization and
zero-adjustment.
Long press
(Approx. 1 sec.):
Demagnetization
and zero-adjustment
Short press
(Within 0.5 sec.):
Zero-adjustment only
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Parts Names and Functions
*4
Malfunction
*3
Malfunction
*2
Malfunction
During overload with
sensor head unlocked
Off
:
−
During overload
(Approx. 4 times/second),
While
unlocked
sensor head
use
state
before
Flashing quickly
Normal
:
During
Normal
(Approx. 1 time/second),
and zero-
adjustment
demagnetization
after
state
startup
At
on
power
Complete
Before In progress
*2
than
Greater
than
Greater
than
Greater
than
Greater
*5
level 2
prescribed
*5
level 1
prescribed
*5
level 2
prescribed
*5
level 1
prescribed
None None None None
*2
Locked Locked Locked Unlocked Locked Locked Unlocked Unlocked
*1
*1
*1
*1
*1
3 times
−
−
−
−
− −
1 s
3 times
− − − −
1 s
3 times
− −
− − −
1 s
Flashing slowly
:
,
Lit up
:
LED on/fl ashing specifi cations
Demagnetizing
Device state
and zero-
adjustment
detected
Overload
ZERO
lock state
Sensor head
DEMAG/AUTO
Function status
JAW
OVERLOAD
UNLOCKED
LED
POWER
lit, even before demagnetization and zero-adjustment.
fl ashing, or while a current value of 0.5 A rms or greater has been detecting.
(Demagnetization and zero-adjustment are disabled.)
from the target conductor and waiting for it to cool off will return the device to its normal state after starting up.)
*1: When the JAW UNLOCKED LED is lit up or the OVERLOAD LED is fl ashing, the DEMAG/AUTO ZERO LED will not be
*2: When the DEMAG/AUTO ZERO key is pressed while the JAW UNLOCKED LED is lit up or the OVERLOAD LED is
Greater than prescribed level 2 (Rating exceeded): Approx. 5.25 A rms (DC, 45 to 66 Hz sine wave)
*3: When an internal temperature anomaly is detected. (Pressing the DEMAG/AUTO ZERO key after removing the device
*4: CPU malfunction (Checksum error). (Have the device repaired.)
*5: Greater than prescribed level 1 (Rating warning): Approx. 4.75 A rms (DC, 45 to 66 Hz sine wave)
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Measurement Workow
1.4 Measurement Workow
Before using the device, be sure to review the “Usage
Notes” (p. 5) and operating procedures.
Inspection Before Use (p. 33)
Preparation for Measurements
Connecting the device to the power supply. (p. 35)
Verify that the 3269 or 3272 is turned off and connect the
1
power cord to the AC electrical outlet.
Lock the device’s sensor head.
2
Connect the power plug of the device to the 3269 or the 3272.
3
Turn the 3269 or the 3272 power switch on.
4
Wait at least 30 minutes after turning on the device.
5
Performing Demagnetizing and Zero-Adjustment. (p. 37)
Adjust the waveform measurement instrument’s zero
1
position and set its input coupling.
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Measurement Workow
Connect the device’s output connector to the waveform
2
measurement instrument.
Press and hold the DEMAG/AUTO ZERO key.
3
(At this time, do not clamp the conductor being measured.)
Performing Measurements. (p. 41)
Clamp the device around the conductor being measured.
1
Lock the device’s sensor head.
2
Observe the current waveform with a waveform
3
measurement instrument.
Finishing Measurements. (p. 43)
Remove the device from the conductor being measured.
1
Disconnect the device from the waveform measurement
2
instrument.
Turn the 3269 or the 3272 power switch off.
3
Disconnect the device’s power plug from the 3269 or 3272.
4
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Measurement Workow
Unplug the 3269 or 3272 power cord from the electrical
5
outlet.
Waveform
measurement
H
Power Source
Load Load
L
Model 3269 or
Model 3272
Power Supply
instrument
Reference
The above gure illustrates an example connection
between the device and a normal oscilloscope or other
instrument that does not have isolated input terminals.
Connect the device as appropriate for the target circuit
and the waveform measuring instrument being used.
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Inspection Before Use
Measurement Procedure
2
2.1 Inspection Before Use
Before using the device for the rst time, verify that it
operates normally to ensure that no damage occurred during
storage or shipping. If you nd any damage, contact your
authorized Hioki distributor or reseller.
See: “Before sending the device for repair” (p. 59)
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Inspection Before Use
Visual check of device and conductor being measured
Operation check
Check Item Action
Is the sensor cracked or
1
damaged?
No
Is the insulation on the
2
cord damaged?
No
Do all the LEDs light up
3
for 1 second after the
device is powered on
(p. 35)?
Yes
Is the insulation of
4
the conductor being
measured damaged?
No
Yes
Yes
No
Yes
Do not use if damage is
present, and return the
device for repair. This
may cause an electric
shock.
The device is broken
and should be repaired
if the LEDs do not
light up or if all LEDs
continue to ash.
Do not clamp the
conductor to avoid an
electric shock.
Inspection complete
34
Page 39
Preparation for Measurements
2.2 Preparation for Measurements
Before preparation for measurements, be sure to read
“Precautions during preparation for measurements” (p. 7).
Items to be prepared
• Model CT6700 or Model CT6701 Current Probe
• Model 3269 or Model 3272 Power Supply (option)
• Waveform measurement instrument (oscilloscope,
recorder, or etc.)
Connecting the device to the Power Supply
Procedures
Verify that the POWER switch on the 3269 or 3272 is in
1
the OFF position and connect the power cord.
To lock the sensor head,
2
push the opening lever
until the JAW UNLOCKED
indication disappears.
At the moment, do not
clamp the conductor
being measured.
35
Page 40
Preparation for Measurements
Connect the power plug
of the device to the power
receptacle of the 3269 or the
3272.
Turn the 3269 or 3272 POWER switch on.
3
Verify the following:
Model 3269 or
3272 Power
Supply
Model CT6700
or CT6701
The front panel POWER indicator
light.
After all LEDs light up for 1 second,
they behave as follows:
Flashing
slowly
Lights up
Power receptacle
36
Page 41
Preparation for Measurements
Wait at least 30 minutes after turning on the device.
4
Immediately after power is supplied, offset drift may
increase due to the effects of self-heating of the device
and other factors. To ensure accurate measurement, wait
at least 30 minutes after turning on the device before
performing measurement.
Performing Demagnetizing and Zero-Adjustment
Always carry out demagnetizing and zero-adjustment before
measurement.
The demagnetizing and zero-adjustment process takes
about 20 seconds.
What is "Demagnetizing"?
Demagnetization is a function used to eliminate the
magnetic charge of the magnetic core, which can result
from turning the power on and off, excessively large input,
or other factors.
What is "Zero-adjustment"?
Zero-adjustment corrects offset voltage uctuations caused
by factors such as the device-specic characteristic offset
voltage and temperature variations.
37
Page 42
Preparation for Measurements
Reference
• The DEMAG/AUTO ZERO LED ashes slowly after
the device is turned on, after input in excess of a
rating is removed, and until demagnetization and zeroadjustment are performed.
• During demagnetization (while the DEMAG/AUTO
ZERO LED is lit up), the demagnetization waveform
(a waveform that attenuates over time) will be output
from the device’s output connector and displayed on
the waveform measurement instrument. The positive
and negative components of this waveform may be
asymmetrical, but this does not represent a device
malfunction.
• If you wish to perform just zero-adjustment without
performing demagnetization, press the DEMAG/AUTO
ZERO key within 0.5 sec.
• To forcibly halt demagnetization or zero-adjustment
while in progress, unlock the sensor head. You will need
to repeat the demagnetization and zero-adjustment
process according to the instructions later.
38
Page 43
Procedures
Set the input coupling of the waveform measurement
1
instrument to GND, adjust the zero position of the
display.
Set the input coupling of the waveform measurement
2
instrument to DC.
Connect the output
3
connector of the device to
the BNC input connector of
the waveform measurement
instrument.
Insert the connector
until it clicks into place
so that it is securely
locked in position.
The device can be connected when the locking pin
on the waveform measurement instrument’s BNC
input connector is in either the horizontal or vertical
orientation.
Preparation for Measurements
39
Page 44
Preparation for Measurements
Press and hold the DEMAG/
4
AUTO ZERO key for about 1
second.
Do not press the key
with excessive force.
Zero-adjustment will be
performed after demagnetization.
While performing demagnetization and zero-adjustment
The LED stops
ashing and lights
up continuously.
After demagnetization and zero-adjustment complete
normally
The LED turns
off.
40
If the DEMAG/AUTO ZERO LED continues ashing
instead of turning off when the DEMAG/AUTO ZERO
key is pressed, demagnetization and zero-adjustment
did not complete normally.
See “Demagnetization and zero-adjustment do not
complete normally.” (p. 60).
Page 45
Performing Measurements
2.3 Performing Measurements
Before performing measurements, be sure to read “Usage
Notes” (p. 5), and “2.1 Inspection Before Use” (p. 33),
and “2.2 Preparation for Measurements” (p. 35) and
perform the described steps.
Procedures
Pull the sensor opening
1
lever, so that the sensor head
opens.
Clamp the conductor being
2
measured.
• Clamp so that the
conductor is in the
center of the sensor
aperture (p. 26).
• Align the sensor so that
the current direction
indication corresponds
to the direction of
current ow through
the conductor to be
measured.
Opening
lever
Low-potential
side (ground
potential side)
Highpotential side
41
Page 46
Performing Measurements
To lock the sensor head,
3
push the opening lever
until the JAW UNLOCKED
indication disappears.
The JAW UNLOCKED LED
turns off.
Monitor the current waveform with the waveform
4
measurement instrument.
The output rate of the device is 1 V/A. The current
sensitivity can be derived from the voltage sensitivity of the
waveform measurement instrument.
For example, if the voltage sensitivity is 10 mV/division, the
current sensitivity is 10 mA/division.
Reference
• Offset voltage uctuations of about 1 mV may occur when
the sensor is opened or closed. To perform high-precision
measurement, perform the steps listed below before
clamping around the conductor being measured. Additionally,
manipulate the lever gradually when closing the sensor
and avoid subjecting the sensor head to large mechanical
shocks. Abrupt manipulation of the lever may increase offset
voltage uctuations due to the shock it generates.
Wait about 5 minutes after the completion of demagnetization
1
and zero-adjustment for offset drift to stabilize.
Operate the opening lever four or ve times to acclimatize
2
the sensor.
Press the DEMAG/AUTO ZERO key briey to perform
3
zero-adjustment only (do not press and hold the key).
• Do not subject the jaw or the opening lever to external force
to prevent the occurrence of offset voltage uctuations.
42
Page 47
Once measurement has completed
Performing Measurements
Pull the opening lever toward
1
you and remove the device
from the conductor being
measured.
Disconnect the terminator
2
from the waveform
measurement instrument.
Pull the connector
straight out while
pulling the unlock lever
toward you.
Terminator can be held using just two ngers, so it’s
easy to connect and disconnect them even if multiple
sensors have been connected.
Turn the 3269 or the 3272 POWER switch off.
3
Opening
lever
43
Page 48
Performing Measurements
Remove the power plug of
4
the device from the 3269 or
the 3272.
• Grip the power supply
plug’s shell (p. 25)
when disconnecting it.
• Do not pull on cords to
disconnect them or twist
the power supply plug.
Unplug the 3269 or 3272 power cord from the electrical
5
outlet.
44
Page 49
Specications
3
3.1 Product Specications
Accuracy and maximum rated current are guaranteed at 23°C±5°C
(73°F±9°F) after the power has been on for 30 minutes.
Items Model CT6700 Model CT6701
Operating
temperature
and humidity
range
Storage
temperature
and humidity
range
Location for
use
Frequency
range
Rise time
(10% to 90%)
0°C to +40°C (32°F to 104°F)
80% RH or less (no condensation)
-10°C to +50°C (14°F to 122°F)
80% RH or less (no condensation)
Indoor, pollution degree 2, altitude up to 2000 m
(6562 ft.)
DC to 50 MHz (-3dB)
Representative
characteristics: See
Fig.1 (p. 49)
7.0 ns or less 2.9 ns or less
DC to 120 MHz (-3dB)
Representative
characteristics: See
Fig.2 (p. 49)
45
Page 50
Product Specications
Items Model CT6700 Model CT6701
Maximum rated
current
Maximum peak
current
Output voltage
rate
Amplitude
accuracy
Output
resistance
Noise
5 A rms (DC, and sine wave)
Derating according to frequency
(Representative characteristics: See Fig.3 and
4 (p. 50))
Note: Depending on the terminator ambient
temperature and measurement conditions,
an overload may be caused by internal
overheating, causing the maximum rated
current to be less than 5 A rms.
±7.5 A peak (non-continuous)
1 V/A
±3.0%rdg.±1 mV (typical ±1.0%rdg. ±1 mV)
(DC, and sine wave 45 to 66 Hz, 0 to 5 A rms)
Example representative waveform response
during 1 mA measurement: See Fig.5 (p. 51)
Note: The amplitude accuracy is not guaranteed
if the state, which includes scratches and
adhesion of foreign objects, of the mating
faces as well as an operating environment
change.
50
±10% (DC)
Ω
75 µ
A rms
or less (typical 60 µ
(for 30 MHz band measuring instrument)
A rms
)
46
Page 51
Product Specications
Items Model CT6700 Model CT6701
Temperature
coefcient for
sensitivity
Maximum rated
power
Supply voltage
Effect of external
magnetic elds
Effect of radiated
radio-frequency
electromagnetic
eld
Effect of
conducted
radio-frequency
electromagnetic
eld
Measurable
conductors
Diameter of
measurable
conductors
±2% rdg. or less
(After zero-adjustment with 50 Hz 5 A rms input,
except at 23°C ±5°C [73°F±9°F])
3.2 VA (with continuous maximum input)
±12 V±0.5 V
20 mA
or less
(DC and 60 Hz,
Magnetic eld of 400
A/m)
±10 mA or less at 3 V/m
±10 mA or less at 3 V
Insulated conductor
5 mm dia. or less
(0.2" dia. or less)
5 mA
or less
(DC and 60 Hz,
Magnetic eld of 400
A/m)
47
Page 52
Product Specications
Items Model CT6700 Model CT6701
Accuracy
warranty period
Product
warranty period
Cord lengths Sensor cord:
External
dimensions
Mass Approx. 250 g (approx. 8.8 oz.)
Accessories Instruction manual, Carrying case
Options • 3269 Power Supply
Standards
Applying
1 year (Opening/closing up to 10000 times)
1 year
1.5 m ±0.1 m (59.06" ±3.94")
Power supply cord:
1 m ±0.1 m (39.37" ±3.94")
Sensor: Approx. 155W × 18H × 26D mm
(approx. 6.10"W × 0.71"H × 1.02"D)
(excluding protrusions)
Terminator: Approx. 29W × 83H × 40D mm
(approx. 1.14"W × 3.27"H × 1.57"D)
(excluding output connector and protrusions)
• 3272 Power Supply
• Safety EN61010
• EMC EN61326
48
Page 53
Representative characteristics
-40
-30
-20
-10
0
10
1 10 100 1k 10k 100k 1M 10M 100M 1000M
Gain [dB]
1. Frequency Characteristics
10
0
Gain [dB]
Gain [dB]
-10
-20
-30
Product Specications
-40
1 10 100 1k 10k 100k 1M 10M 100M 1000M
Frequency [Hz]
Frequency [Hz]
Fig.1 Frequency characteristics (typical) (CT6700)
10
0
Gain [dB]
Gain [dB]
-10
-20
-30
-40
1 10 100 1k 10k 100k 1M 10M 100M 1000M
Fig.2 Frequency characteristics (typical) (CT6701)
Frequency [Hz]
Frequency [Hz]
1G
1G
49
Page 54
Product Specications
0
1
2
3
4
5
6
100 1k 10k 100k 1M 10M 100M 1000M
Maximum input current [A]
TA = 23℃ , Sine wave
2. Derating According to Frequency
6
5
4
3
Maximum input current [A]
2
1
TA = 23℃ , Sine wave
0
100 1k 10k 100k 1M 10M 100M 1000M
Fig.3 Derating according to frequency (CT6700)
6
5
4
3
Maximum input current [A]
2
1
TA = 23℃ , Sine wave
0
100 1k 10k 100k 1M 10M 100M 1000M
Fig.4 Derating according to frequency (CT6701)
50
1G
Frequency [Hz]
1G
Frequency [Hz]
Page 55
Product Specications
Reference
Figures 3 and 4 (p. 50), “Derating according to
frequency,” assume operation at the temperature for which
accuracy is dened and with sine-wave input.
If the ambient temperature (T
) rises or the current being
A
measured contains a high-frequency component, the
device’s temperature will rise, and the current value and
frequency that can be continuously input will fall.
3. 1 mAp-p measurement waveform
1 mA/DIV
BW=20 MHz
1 ms/DIV
Fig.5 Example 1 mAp-p 1 kHz measurement waveform (CT6700)
51
Page 56
Product Specications
0.001
0.01
0.1
1
100 1k 10k 100k 1M 10M 100M 1000M
Input impedance [Ω]
4. Input Impedance
The location at which the device has been clamped will
exhibit the impedance (load) shown in Figures 6 and 7
below. It is especially important to take this data into account
when performing high-frequency measurement.
1
]
Ω
0.1
Input impedance [Ω]
Input impedance [
0.01
52
0.001
100 1k 10k 100k 1M 10M 100M 1000M
Fig.6 Input impedance (typical) (CT6700)
1
]
Ω
0.1
Input impedance [Ω]
Input impedance [
0.01
0.001
100 1k 10k 100k 1M 10M 100M 1000M
Fig.7 Input impedance (typical) (CT6701)
1G
1G
Frequency [Hz]
1G1G1G
1G
Frequency [Hz]
Page 57
Product Specications
5. Effect on conductor being measured (inside sensor aperture)
common-mode voltage
-60
-80
-100
-120
-140
-160
Output volt. / Common mode volt. [dB]
-180
100 1k 10k 100k 1M 10M
Frequency [Hz]
Fig.8 Effect of common-mode voltage (typical) (CT6700/CT6701)
53
Page 58
Functions
3.2 Functions
Demagnetizing and
Zero-Adjustment
Function
1. Demagnetizing and zero-adjustment
• Operation:
Performs demagnetization and zeroadjustment.
• User action:
Press and hold the DEMAG/AUTO
ZERO key for at least 500 ms (typical).
2. Zero-adjustment
• Operation:
Performs zero-adjustment.
• User action:
Press and hold the DEMAG/AUTO
ZERO key for at least 20 ms but less
than 500 ms (typical).
Cannot be performed in the following
circumstances:
• When the sensor head is unlocked (when
the JAW UNLOCKED LED is lit up)
• During an overload condition (when the
OVERLOAD LED is ashing)
• When a current measured value in excess
of 0.50 ±0.25 A rms (DC, 45 to 66 Hz sine
wave) is detected
54
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Functions
Demagnetizing and
Zero-Adjustment
Function
Sensor head
unlocked detection
Energization
detection
DEMAG/AUTO ZERO LED
• Slow ashing orange:
After the device is powered on, after
input in excess of ratings is removed,
or after demagnetization terminated
abnormally
• Continuous orange:
During demagnetization and zeroadjustment
• Off:
After demagnetization and zeroadjustment
The JAW UNLOCKED LED will turn red
(lighting up continuously) if the sensor head
is not locked.
The POWER LED will turn green (lighting
up continuously) when the device is
energized.
55
Page 60
Functions
Overload detection
Sampling frequency: 7.8125 kHz
Conrmation cycle : 500 ms (typical)
(sampling: 400 ms (typical); calculation and
judgment: 100 ms (typical))
1. Rating warning
• Indicates that the maximum rated
current is about to be reached.
• OVERLOAD LED: Red, slow ashing
• Flashing conditions:
If prescribed level 1 is exceeded
• Prescribed level 1: 4.75 ±0.25 A rms
(DC, 45 to 66 Hz sine wave)
2. Rating exceeded
• Indicates that the maximum rated
current has been exceeded.
• OVERLOAD LED: Red, fast ashing
• Flashing conditions:
If prescribed level 2 is exceeded
• Prescribed level 2: 5.25±0.25 A rms (DC,
45 to 66 Hz sine wave)
3. Temperature exceeded
• Detects internal temperature anomalies.
• Set temperature: 80°C (typical)
• Hysteresis: 10°C (typical)
• LED: All ashing except POWER LED
• Recovery method:
To return to initial state (state at poweron), remove the device from the
conductor being measured, allow it to
cool off, and press the DEMAG/AUTO
ZERO key.
(typical)
56
Page 61
Maintenance and Service
4
WARNING
Ensure that the input does not exceed the
maximum input voltage or current to avoid
device damage, shortcircuiting and electric
shock resulting from heat building.
IMPORTANT
Periodic calibration is necessary in order to ensure that
the device provides correct measurement results of the
specied accuracy.
The calibration frequency varies depending on the status of
the device or installation environment. We recommend that
the calibration frequency is determined in accordance with
the status of the device or installation environment and that
you request that calibration be performed periodically.
57
Page 62
Troubleshooting
4.1 Troubleshooting
• If damage is suspected, check the “Before sending the
device for repair” (p. 59) section before contacting your
authorized Hioki distributor or reseller.
• If no waveform is displayed even after performing
demagnetization and zero-adjustment (p. 37), internal
damage may have occurred. Contact your authorized
Hioki distributor or reseller.
• If you must send the device out for repair, pack the device
so that it will not sustain damage during shipping, and
include a description of existing damage. We do not take
any responsibility for damage incurred during shipping.
(See “Precautions during shipment” (p. 1))
58
Page 63
Troubleshooting
Before sending the device for repair
Symptom Check and/or remedy
No waveform is
displayed on the
connected waveform
measurement
instrument
A resonant sound is
emitted by the sensor
head.
The resonant sound
emitted by the sensor
head has grown
louder.
The positive and
negative components
of the demagnetization
waveform are
asymmetrical.
• Perform demagnetization and zero-
adjustment again. (p. 37)
• Verify that the waveform measurement
instrument’s input coupling parameter
is set to DC. (p. 39)
If this fails to remedy the issue, the
device may be malfunctioning.
Have it repaired.
A resonant sound may be emitted
depending on the amplitude and
frequency of the current being
measured. Such a sound may also
be emitted during demagnetization.
Measurement is not affected.
The gap between the upper and lower
sensors may have increased in size.
It is recommended to calibrate the
device since the gap may cause sensor
characteristics to vary.
This is not a malfunction. Verify that the
demagnetization and zero-adjustment
process results in an appropriate zero
position of the measurement waveform
instrument.
59
Page 64
Troubleshooting
Symptom Check and/or remedy
Demagnetization and
zero-adjustment do not
complete normally.
Demagnetization and automatic zeroadjustment cannot be performed in the
following circumstances:
Repeat demagnetization and zero-
adjustment (p. 37) after implementing
the suggested remedy.
Circumstances Remedy
When the JAW
UNLOCKED LED
is lit up
When the
OVERLOAD LED
is ashing
When a current of
0.5 A rms or greater
has been detected
If demagnetization and zero-adjustment
do not complete normally even
though no current is being measured,
the device is broken and should be
repaired.
Lock the sensor
head. (Press the
opening lever
until the JAW
UNLOCKED
indicator turns
off.)
Disconnect the
device from the
conductor being
measured.
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Error
4.2 Error
You can determine the nature of an error by observing the
device’s LED. When an error occurs, deal with it as described
in the following table. If the device needs to be repaired,
please contact your authorized Hioki distributor or reseller.
Error State Solution
LEDs
continue
to ash
quickly.
LED is
lit up
continuously.
LEDs
continue
to ash
quickly.
A temperature anomaly has been
detected due to heating caused by
an overload. Remove the device
from the conductor being measured
immediately. Allow the device to cool
under conditions of no input and then
press the DEMAG/AUTO ZERO key.
The device will return to its state when
it was turned on. Start measurement
after performing demagnetization and
zero-adjustment again. (p. 37)
It is recommended to calibrate the
device since internal components may
have been subject to stress.
An internal CPU malfunction
(checksum error) has occurred . Have
the device repaired.
61
Page 66
Error
Error State Solution
LEDs ash
quickly
three times.
LED is
lit up
continuously.
All LEDs
off even
though the
device is
receiving
power
This issue occurs when the DEMAG/
AUTO ZERO key is pressed under the
circumstances described in the table
below.
Demagnetization and automatic zero-
adjustment cannot be performed.
Perform demagnetization and zero-
adjustment (p. 37) again after
implementing the remedy described
below.
Circumstances Remedy
When the JAW
UNLOCKED
LED is lit up
When the
OVERLOAD
LED is ashing
When a current
of 0.5 A rms
or greater has
been detected
The device has malfunctioned. Have it
repaired.
Lock the sensor
head.
(Press the opening
lever until the
JAW UNLOCKED
indicator turns off.)
Remove the
device from the
conductor being
measured.
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Cleaning
4.3 Cleaning
To clean the device, wipe it gently with a soft cloth moistened
with water or mild detergent.
IMPORTANT
Never use solvents such as benzene, alcohol, acetone,
ether, ketones, thinners or gasoline, as they can deform
and discolor the case.
CAUTION
• Measurements are degraded by dirt on the facing
surfaces of the sensor head, so keep the surfaces
clean by gently wiping with a soft cloth.
• Before cleaning the facing surfaces on the
sensor head, discharge any static electricity that
may have built up on your hands by touching a
nearby metal object. In this way you can ensure
that a high voltage, for example caused by static
electricity, will not be applied to the device.
Application of a high voltage to the device may
damage the internal Hall elements or circuitry.
• Clean the vents periodically to avoid blockage.
If a vents becomes clogged, the devices internal
cooling is impeded, and damage may result.
63
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Discarding the Device
4.4 Discarding the Device
Handle and dispose of the device in accordance with local
regulations.
64
Page 69
16-01 EN
Page 70
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