Hioki CT6710 User manual

EN
EN
CT6711
CURRENT PROBE
CT6710
Instruction Manual
Feb. 2019 Edition 1
CT6710A961-00 19-02H
CT6711
CURRENT PROBE
CT6710
Instruction Manual
Feb. 2019 Edition 1
CT6710A961-00 19-02H

Measurement Procedure
Be sure to familiarize yourself with the “Usage Notes”
section (p. 8), each instruction of use, and safety notes
presented at the beginning of each instruction of use.
Inspecting the Device Before Use (p. 26)
Preparing for Measurement (p. 28)
Provide power to the device.
Connect the termination unit to the host waveform
measuring instrument.
Execute demagnetization and automatic zero-
adjustment.
Measuring Currents (p. 40)
Clamp the sensor around a conductor to be
measured.
Measure a current.
Finishing Measurement (p. 64)
CT6710A961-00

Connection Example
Waveform measuring instrument
Model 3269 Power Supply
HL
Power source
Load
See “Example of connection to the circuit to be measured”
(p. 48).

i
Contents
Introduction...........................................................................1
Notations ..............................................................................2
Conrming Package Contents..............................................5
Safety Notes.........................................................................7
Usage Notes.........................................................................8
1 Overview 13
1.1 Product Overview............................................13
1.2 Product Features.............................................14
1.3 Name and Function of Each Part ....................16
Termination unit ........................................................ 16
Junction box (keys, LEDs) ........................................18
Sensor ......................................................................20
1.4 Specications of Lighting up / Blinking
LEDs ...............................................................22
2 Current Measurement 25
2.1 Inspecting the Device Before Use...................26
2.2 Preparing for Measurement ............................28
Providing power to the device................................... 29
Executing demagnetization and automatic zero-
adjustment ................................................................33
2.3 Measuring Currents.........................................40
How to measure a current ........................................49
To measure a low current .........................................57
To measure a current accurately ..............................59
When the device has entered protection mode ........61
2.4 Finishing Measurement...................................64
4
3
2
1
Index

ii
Contents
3 Specications 67
3.1 General Specications ....................................67
3.2 Specications of Input, Output, and
Measurement ..................................................69
Basic specications ..................................................69
Specications of accuracy ........................................71
3.3 Specications of Functionality.........................73
3.4 Typical Characteristics ....................................75
Frequency characteristics......................................... 75
Frequency derating curve .........................................76
Input impedance .......................................................78
Consumption current ................................................ 79
Inuence of common-mode voltage.......................... 80
4 Maintenance and Service 81
4.1 Troubleshooting...............................................82
Before sending back your device for repair ..............83
4.2 Errors ..............................................................86
Types of errors..........................................................87
4.3 Cleaning ..........................................................94
4.4 Disposal ..........................................................95
Index 97
Warranty

1
Introduction
Introduction
Thank you for choosing the Hioki CT6710, CT6711 Current
Probe. Preserve this manual carefully and keep it handy to
make full use of this device for a long time.
Each model offers a different frequency band listed below:
Model CT6710: DC to 50 MHz
Model CT6711: DC to 120 MHz
Following manuals are provided along with these models.
Refer to manuals relevant to your purpose.
• Current Sensor Operating Precautions
Information on the device for safe operation
• Instruction Manual (this document)
Basic instructions and specications of the device
Also read the separate document “Current Sensor Operating
Precautions” carefully before using this device.
Target audience
This manual has been written for use by individuals who use
the product in question or who teach others to do so.
It is assumed that the reader possesses basic electrical
knowledge (equivalent to that of someone who graduated
from the electrical program at a technical high school).

2
Notations
Notations
Safety notations
In this manual, the risk seriousness and the hazard levels
are classied as follows.
DANGER
Indicates an imminently hazardous situation
that will result in death or serious injury to
the operator.
WARNING
Indicates a potentially hazardous situation
that may result in death or serious injury to
the operator.
CAUTION
Indicates a potentially hazardous situation
that may result in minor or moderate injury
to the operator or damage to the device or
malfunction.
IMPORTANT
Indicates information related to the
operation of the device or maintenance
tasks with which operators must be fully
familiar.
NOTE
Indicates advisory items related to
performance or correct operation of the
device.
Indicates a high voltage hazard.
If a particular safety check is not performed
or the device is mishandled, the operator
can suffer from a hazardous situation such
as an electric shock, burn, or even fatal
injury.

3
Notations
Indicates prohibited actions.
Indicates an action that must be performed.
Symbols shown on the device
Indicates cautions and hazards. When this symbol is
displayed on the device, refer to the “Usage Notes”
section (p. 8) and warning messages presented at
the beginning of each instruction of use in the Instruction
Manual, and included “Current Sensor Operating
Precautions” for more information.
Indicates that only insulated conductors appropriate to
the voltage of the circuit under test can be measured.
Symbols for various standards
Indicates the Waste Electrical and Electronic Equipment
Directive (WEEE Directive) in EU member states.
Indicates that the product conforms to regulations set
out by the EU Directive.

4
Notations
Others
*Additional information is presented below.
Bold Keys of the device are indicated in boldface.
Accuracy
We dene measurement tolerances in terms of rdg. (reading)
with the following meanings:
rdg.
(reading or displayed value)
The value currently being measured and indicated
on a measuring instrument.

5
Conrming Package Contents
Conrming Package Contents
When you open the package, inspect the device carefully
to ensure that everything is in good condition, and that no
damage occurred during shipping.
Check the accessories, keys, and connectors carefully. If
the device seems to have been damaged or does not work
as specied, contact your authorized Hioki distributor or
reseller.
Check that the package contents are correct.
 Model CT6710/CT6711 Current Probe
Accessories
 Carrying case
Instruction Manual
 Current Sensor Operating Precautions (0990A901)
The carrying case contains the current probe, Instruction Manual,
and Current Sensor Operating Precautions.

6
Conrming Package Contents
Option
The following option is available for the device. Contact your
authorized Hioki distributor or reseller when ordering.
Model 3269 Power Supply
Model 3269 can provide the power to up to two probes
of Model CT6710 or Model CT6711.
(Model 3272 Power Supply cannot be used as a power
supplying unit for Model CT6710/CT6711)
Precautions for transportation
• Store the packaging materials even after unpacking
because you will need them when you transport the
device.
• Transport the device in its carrying case.

7
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.
Carefully read the following safety notes before using this
device.
DANGER
Familiarize yourself with the instructions and
precautions in this manual before use the
device. Mishandling the device could result in
bodily injury or even death, as well as damage
to the device.
WARNING
If you have not used electrical measuring
devices before, you should be supervised by
a technician who has experience in electrical
measurement. Electricity can cause potentially
serious events such as an electric shock, heat
generation, re, and an arc ash due to a short-
circuit.

8
Usage Notes
Usage Notes
Follow these precautions to ensure safe operation and to
obtain the full benets of the various functions.
Ensure that your use of the device falls within the
specications not only of the device itself, but also of any
accessories, options and other equipment being used.
DANGER
Do not use the device for measuring bare
conductors. Doing so may result in a short-
circuit or electric shock. Take measurements at
a location on an insulated wire with sufcient
insulation for the circuit voltage.

9
Usage Notes
DANGER
•Do not remove any covers of the sensor,
junction box, and termination unit. The
internal components of the device carry high
voltages and may become very hot during
operation. Making contact with them could
cause an electric shock and burns.
•Do not apply the device to the primary side
of a distribution panel. If a short-circuit
occurs on the primary side, an unrestricted
current ow can damage the device and
facilities. Even if a short-circuit occurs on the
secondary side of the distribution panel, the
panel will interrupt the short-circuit current.
•Do not use the device in strong magnetic
elds. If you do, the sensor could become
abnormally hot, resulting in damage to the
device, a re, or burn to the operator.
Follow all operating precautions for a waveform
measuring instrument or any other measuring
instrument this device is connected to.

10
Usage Notes
WARNING
•Do not use the device to measure circuits that
exceed the ratings or specications of the
device. Damage to the device or overheating
can cause bodily injury.
•Do not install the device in the following
locations. Failure to observe this could cause
a malfunction of the device, an accident, or
re.
•Exposed to direct sunlight or high
temperatures
•Exposed to corrosive or combustible gases
•Exposed to water, oil, chemicals, or solvents
•Exposed to high humidity or condensation
•Exposed to strong electromagnetic elds or
electrostatic charges
•Exposed to high concentrations of dust
particles
•Near induction heating systems (such as
high-frequency induction heating systems
and IH cooking equipment)
•Susceptible to vibration
•Near HF power supply units

11
Usage Notes
WARNING
Conrm that the insulation on the cords is
undamaged and that no bare conductors are
improperly exposed before using the device.
Any damage to the device leads to an electric
shock. Contact your authorized Hioki distributor
or reseller for repair.
CAUTION
• Do not place the device on an unstable surface or
an inclined place. Dropping or knocking down the
device could cause bodily injury or damage to the
device.
• Do not store and use the device in locations
subject to abrupt temperature changes. Doing so
could damage the sensor heads.
• Do not apply force in the directions shown in
the gure below while the upper jaw is locked
in place. Doing so may damage the retracting/
extending mechanism.
Opening lever position
when the upper jaw is
locked in place
Do not
apply force.

12
Usage Notes
CAUTION
• Keep the upper jaw locked in place when the
device is not in use. Leaving the upper jaw
unlocked causes dust or dirt to settle on the
facing core surfaces, which can damage the
device.
• Properly connect the device to a circuit to be
measured and a host waveform measuring
instrument. Improperly connecting them could
cause an electric shock or damage to the device
and instrument.

13
1
1Overview
1.1 Product Overview
Model CT6710/CT6711 is a clamp-on current probe that
features high current-detection sensitivity and broad
frequency band. The probe uses three current ranges to
detect current waveforms from 1 mA to 50 A.
You can directly connect the termination unit to a BNC input
terminal of your waveform measuring instrument such as
an oscilloscope and recorder, and then clamp the sensor
around a conductor to be measured to easily observe
current waveforms.
Sensor (p. 20)
Termination unit (p. 16)
Junction box (p. 18)
1 Overview

14
Product Features
1.2 Product Features
Clamp-on sensor heads (p. 21)
The clamp-on sensor heads allow current measurement
without the need to make physical contact with a
conductor to be measured, or to disconnect it. You can
observe current waveforms while maintaining the ow of
electric current.
Sliding jaw retracting/extending mechanism
(p. 21)
This feature lets you easily retract, extend, and lock the
upper jaw in place to clamp the sensor around a conductor
to be measured.
Easy-to-connect output terminal (p. 17, p. 37)
Insert the output terminal into a BNC input terminal on
your waveform measuring instrument to connect the
termination unit.
Warning LED lights (p. 18)
The warning LEDs alert you to an overload (indicating
that an input current value exceeds the rated current of
the device) or jaw unlocked condition (indicating that the
upper jaw has not been locked in place).