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CT6710
Instruction Manual
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Hioki CT6710, CT6711 Instruction Manual

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CT6710
CT6711
CURRENT PROBE
Instruction Manual

Aug. 2020 Revised edition 1 CT6710A961-01 20-08H
EN
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
Preparing for Measurement
• Provide power to the device.
• Connect the termination unit to your waveform measuring instrument.
• Execute demagnetization and automatic zero-
adjustment.
Measuring Currents
• Clamp the sensor around a conductor to be measured.
• Measure a current.
Finishing Measurement
CT6710A961-01
(p. 26)
(p. 28)
(p. 41)
(p. 65)
Connection Example
Waveform measuring instrument
H
Power source
Load
See “Example of connection to the circuit to be measured” (p. 49).
L
Model 3269 Power Supply
Contents
Introduction .....................................................................................1
Notations ......................................................................................... 2
Checking 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 CT6710/CT6711 ............................... 29
Executing demagnetization and automatic
zero-adjustment .................................................................... 33
2.3 Measuring Currents ................................................ 41
How to measure a current .................................................... 50
To measure a low current ..................................................... 58
To measure a current accurately .......................................... 60
When the device has entered protection mode .................... 62
2.4 Finishing Measurement .......................................... 65
1
2
3
4
Index
i
Contents
3 Specications 69
3.1 General Specications ........................................... 69
3.2 Specications of Input, Output, and
Measurement ........................................................... 71
Basic specications .............................................................. 71
Specications of accuracy .................................................... 73
3.3 Specications of Functionality .............................. 75
3.4 Typical Characteristics ...........................................77
Frequency characteristics ..................................................... 77
Frequency derating curve ..................................................... 78
Input impedance ................................................................... 80
Consumption current ............................................................ 81
Inuence of common-mode voltage ...................................... 82
4 Maintenance and Service 83
4.1 Troubleshooting ......................................................84
Before sending back your device for repair .......................... 85
4.2 Errors ....................................................................... 88
Types of errors ...................................................................... 89
4.3 Cleaning ................................................................... 96
4.4 Disposal ................................................................... 97
Index 99
Warranty
ii

Introduction

Introduction
Thank you for choosing the Hioki CT6710, CT6710 Current Probe. To ensure your ability to get the most out of this device over the long term, please read this manual carefully and keep it available for future reference.
Each model o󰀨ers a di󰀨erent frequency band listed below:
Model CT6710: DC to 50 MHz Model CT6711: DC to 120 MHz
The 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
Please review the separate “Current Sensor Operating
Precautions” before using the 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).
1

Notations

Notations
Safety notations
This manual classies seriousness of risks and hazard levels as described below.
Indicates an imminently hazardous situation
DANGER
WARNING
CAUTION
that, if not avoided, will result in death or serious injury.
Indicates a potentially hazardous situation that, if not avoided, could result in death or serious injury.
Indicates a potentially hazardous situation that, if not avoided, could result in minor or moderate injury.
NOTICE
IMPORTANT
NOTE
Indicates a high-voltage hazard. Failure to verify safety or improper handling of the device could lead to electric shock, burn injury, or death.
2
Indicates potential risks of damage to the supported product (or to other property).
Indicates information or content that is particularly important from the standpoint of operating or maintaining the device.
Indicates useful advice concerning device performance and operation.
Indicates an action that must not be performed.
Indicates an action that must be performed.
Symbols shown on the device
Indicates the presence of a potential hazard. For more information about locations where this symbol appears on device components, see the “Usage Notes” section (p. 8), warning messages listed at the beginning of operating instructions, and the accompanying document entitled “Current Sensor Operating Precautions.”
Indicates that the device can only be used at a location on an insulated wire with su󰀩cient insulation for the
circuit voltage.
Symbols for various standards
Indicates the Waste Electrical and Electronic Equipment Directive (WEEE Directive) in EU member states.
Indicates that the product complies with standards imposed by EU directives.
Notations
3
Notations
Others
*
Indicates additional information is described below.
Bold
Indicates the names of the control keys.
Accuracy
Hioki denes tolerances for measured values in terms of percentage of reading, as indicated below.
Reading (Displayed value) Indicates the value the measuring instrument
rdg.
displays. Tolerances for reading errors are expressed in percent of reading (% of reading, % rdg).
4

Checking Package Contents

Checking Package Contents
When you receive the device, inspect it to ensure that no damage occurred during shipment. Pay particular attention to keys and connectors. If you nd any damage or discover that the device does not perform as indicated in its specications, please contact your authorized Hioki distributor or reseller.
Check that the package contents are correct. The carrying case contains the current probe, Instruction Manual, and Current Sensor Operating Precautions.
Carrying case
(Accessory)
Model CT6710/CT6711 Current Probe
Instruction Manual
(Accessory)
Current Sensor Operating Precautions
(0990A901)
(Accessory)
5
Checking Package Contents
Option
The option below is available for the device. To order an option, please contact your authorized Hioki distributor or
reseller.
Options are subject to change. Check Hioki’s website for the
latest information.
Model 3269 Power Supply

The 3269 Power Supply can provide the power to up to two probes of the CT6710/CT6711. (The 3272 Power Supply cannot be used as a power supplying unit for the CT6710/CT6711.)
Precautions for transportation
• Store packaging materials for future use. You will need the packaging materials when shipping the device.
• Transport the device in its carrying case.
6

Safety Notes

Safety Notes
The device has been designed in accordance with the IEC 61010 safety standard, and its safety has been veried by means of testing prior to shipment. However, failure to follow the information in this manual could render safety-related functionality provided by the device ine󰀨ective. Please review the safety information below before using the device.
DANGER
Read this manual carefully and ensure you
understand its contents before using the
device.
Improper use of the device could result in serious bodily injury or damage to the device.
WARNING
If using an electrical measuring instrument
for the rst time, seek instruction from an individual with electrical measurement experience rst.
Failure to do so may lead to electric shock, overheating, re, arcing due to a short-circuit, or other hazards.
7

Usage Notes

Usage Notes
Be sure to follow the precautions listed below in order to use the device safely and in a manner that allows it to function e󰀨ectively. Use of the device should conform not only to its specications, but also to the specications of all accessories, options, and other equipment in use.
DANGER
Do not use the device for measuring bare
conductors.
Take measurements at a location on an
insulated wire with su󰀩cient insulation for the
circuit voltage.
Doing so may result in electric shock or a short-circuit.
8
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. Touching them could cause electric shock or burns.
Do not connect 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, resulting in serious bodily injury. 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 powerful magnetic
elds.
Doing so could cause the sensor to become abnormally hot, resulting in bodily injury, damage to the device, or re.
Follow all operating precautions for a
waveform measuring instrument or any other measuring instruments to which this device is
connected.
Failure to observe this could cause serious bodily injury or damage to these instruments.
9
Usage Notes
Do not use the device to measure circuits that
Do not install the instrument in locations such
WARNING
exceed the ratings or specications of the
device.
Doing so could cause damage to the device or overheating, resulting in bodily injury.
as the following:
• In locations where it would be subject to direct
sunlight
• In locations where it would be subject to high
temperatures
• In locations where it would be exposed to corrosive
or explosive gases
• In locations where it would be exposed to water, oil,
chemicals, or solvents
• In locations where it would be exposed to high
humidity or condensation
• In locations where it would be exposed to powerful
electromagnetic radiation
• Close to objects carrying an electric charge
• In locations with an excessive amount of dust
• Close to inductive heating devices (high-frequency
inductive heating devices, IH cooktops, etc.)
• In locations characterized by a large amount of
mechanical vibration
• Close to HF power supply units
Doing so could cause damage to the device or cause it to malfucntion, resulting in bodily injury.
10
Usage Notes
WARNING
Ensure that the insulation on the cords is
undamaged and that no bare conductors are improperly exposed before using the device.
Any damage to the cords leads to electric shock. Contact your authorized Hioki distributor or reseller for
repair.
CAUTION
Do not place the device on an unstable stand
or angled surface.
Doing so could cause the device to fall or overturn,
resulting in bodily injury or damage to the device.
Properly connect the device to a circuit to
be measured and your waveform measuring
instrument.
Improperly connecting them could cause electric shock or damage to the circuit, device, or your instrument.
11
Usage Notes
Do not store or use the device in locations
Do not apply force in the directions shown in
Do not
apply force.
Keep the upper jaw locked in place when the
NOTICE
subject to abrupt temperature changes.
Doing so could damage the sensor heads.
the gure below while the upper jaw is locked
in place.
Opening lever position
when the upper jaw is
locked in place
Doing so may damage the retracting/extending
mechanism.
device is not in use.
Leaving the upper jaw unlocked will cause dust or dirt to settle on the facing core surfaces, resulting in damage to the device.
12
1

Overview

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 observe current
waveforms easily.
Sensor (p. 20)
Junction box (p. 18)
Termination unit (p. 16)
1
13
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. 38)
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).
14
Product Features
Three current measurement ranges (p. 53)
You can choose from the three ranges according to the magnitude of the current to be measured. This feature lets you observe a wide range of currents, from 1 mA to 50 A.
Broad frequency band (p. 71)
Model CT6710: DC to 50 MHz Model CT6711: DC to 120 MHz
Demagnetizing and automatic zero-adjustment functions (p. 33)
You can use a single key to demagnetize the magnetic cores and correct variations in o󰀨set voltage, both of which are required before measuring.
Protection mode (p. 62)
The device automatically enters protection mode to prevent damaging itself when overheating.
1
15
Name and Function of Each Part

1.3 Name and Function of Each Part

Termination unit

See p. 34 and p. 35.
Top view
1 2
5
16
3
4
6
Name and Function of Each Part
Output terminal
1
The device converts a captured current waveform into a voltage waveform by multiplying a particular rate according to a specied current range and outputs the voltage
waveform from this terminal. Connect this terminal to a BNC input terminal of your waveform measuring instrument.
Unlock lever
2
To disconnect the output terminal, pull on the termination unit
while simultaneously pulling this lever.
Vents
3
The unit has the vents on the sides and bottom. Do not clog
them.
Serial number
4
The serial number consists of nine digits. The rst two digits indicate the year of manufacture, while the second two digits indicate the month of manufacture. Do not remove this sticker as the number is important.
Power plug
5
Power is provided to the CT6710/CT6711 through this plug.
Connect this plug with the 3269 Power Supply.
Shell
6
Pull on the power plug while simultaneously pulling this shell
to disconnect the plug.
1
You can easily connect and disconnect the termination unit with two ngers
even when multiple termination units
are connected to a waveform measuring
instrument.
17
Name and Function of Each Part

Junction box (keys, LEDs)

4
5
6
7
1
8
DEMAG / AUTO ZERO key
1
Hold down (about 1 s)
Press momentarily
(less than 0.5 s)
(Higher range) key (p. 53)
2
Switch over to a next higher current range.
(Does not switch from the 30 A range to the 0.5 A range)
(Lower range) key (p. 53)
3
Switch over to a next lower current range.
(Does not switch from the 0.5 A range to the 30 A range)
18
2
3
Top view
Performs demagnetization followed by automatic zero-adjustment. (p. 33)
Performs automatic zero-adjustment alone. (p. 40)
Name and Function of Each Part
POWER LED (green light)
4
• Lights up when the power is on (p. 31). (Normal operation)
• Rapidly blinks when a checksum error has occurred (p. 95).
OVERLOAD LED (red light)
5
• Flashes three times when demagnetizing or automatic zero­adjustment cannot be performed (p. 91).
• Rapidly blinks when an overload state is detected (p. 90), the device has entered protection mode (p. 62), or a checksum error has occurred (p. 95).
JAW UNLOCKED LED (red light)
6
• Lights up when the upper jaw is unlocked.
• Flashes three times when demagnetizing or automatic zero-
adjustment cannot be performed (p. 91).
• Rapidly blinks when the device has entered protection mode (p. 62) or a checksum error has occurred (p. 95).
DEMAG / AUTO ZERO LED (orange light)
7
• Slowly blinks when demagnetization or automatic zero­adjustment has not yet been performed (p. 33).
• Lights up when demagnetization and automatic zero­adjustment are
• Goes out when demagnetization and automatic zero­adjustment have been completed (p. 39).
• Flashes three times when demagnetization and automatic zero-adjustment cannot be performed (p. 91).
• Rapidly blinks when the device has entered protection mode (p. 62) or a checksum error has occurred (p. 95).
RANGE LEDs (green lights)
8
• Lights up when its current range is chosen (p. 53). (Normal operation)
• Blinks rapidly when the device has entered protection mode (p. 62) or a checksum error has occurred (p. 95).
in execution
(p. 39).
1
19
Name and Function of Each Part

Sensor

NOTICE
Do not store or use the device in locations
subject to abrupt temperature changes.
Do not apply force or mechanical shock to the
device.
Do not subject the device to static electricity.
Doing so could damage the device.
4
2
See p. 41.
1
3
4
20
5
6
See p. 41.
When the upper jaw is unlocked
See p. 41.
Top view
Name and Function of Each Part
Jaws
1
Clamp this part around a conductor to be measured by operating the opening lever, which allows the upper jaw to slide (retract/extend).
Sensor aperture
2
A conductor to be measured must pass through this
aperture.
Sensor heads
3
The sensor heads, located inside the jaws, detects currents.
Current direction indicator
4
Clamp the sensor around the conductor such that the direction this arrow indicates matches the current direction of a conductor to be measured.
JAW UNLOCKED indicator
5
If this indicator appears, the upper jaw is not locked in place.
Opening lever
6
To retract and extend the upper jaw, always operate this lever. This lever allows you to retract and lock the upper jaw
in place.
1
21
Specications of Lighting Up / Blinking LEDs
1.4 Specications of Lighting Up /
Blinking LEDs
: Lighting up : O󰀨 : Blinking
Device state LED
Automatic
zero-
adjustment
1 − − (On start-up)
2 Not performed Not detected (Initial state)
In execution
3
(Incl. demag.)
In execution
4
(excl. demag.)
5 Completed Not detected (Before use, normal state )
6 Completed Exceeds prescribed level −
7 Not performed Exceeds prescribed level −
8 Completed Not detected Upper jaw unlocked
9 Completed Exceeds prescribed level Upper jaw unlocked
10 Not performed Not detected Upper jaw unlocked
11 Not performed Exceeds prescribed level Upper jaw unlocked
12 − *1 *1
13 − −
14 − −
Overload Others
− (No range keys available)
− (No range keys available)
Excess heat detected in
junction box*
ROM checksum error at
power-on (CPU failure)
2
*1. When the DEMAG / AUTO ZERO key is pressed under any one of the
following conditions (p. 91):
• The upper jaw is unlocked.
• An overload has been detected whether or not the upper jaw is locked in place.
• A current exceeding 0.5 A rms has been detected whether or not the
upper jaw is locked in place.
*2. Press any key to restore the device. The ranges cannot be switched until
the device is restored. See “When the device has entered protection mode” (p. 62).
Green
POWER
Rapidly
22
Specications of Lighting Up / Blinking LEDs
: Lighting up : O󰀨 : Blinking
Red Red Orange Green
OVERLOAD JAW UNLOCKED
1 s 1 s 1 s 1 s 1 s 1 s 1
LED
DEMAG / AUTO
ZERO
Slowly*
30 A 5 A 0.5 A
4
RANGE
3
Rapidly*
3
Rapidly*
3
Rapidly*
3
Rapidly*
Rapidly
ashes 3 times
Rapidly
Rapidly
*3. Blinks at 250-ms intervals. (duty ratio: 50%) *4. After the device is turned on and then all LEDs light up for 1 second, the
DEMAG / AUTO ZERO LED blinks, which indicates that demagnetization
or automatic zero-adjustment has not yet been performed.
*5. Even when demagnetization or automatic zero-adjustment has not yet
been performed, the device that has detected an overload and that with the upper jaw unlocked leave the DEMAG / AUTO ZERO LED unlit.
 
Rapidly
ashes 3 times
Rapidly
Rapidly
5
*
5
*
Rapidly
ashes 3 times
Rapidly
Rapidly
Specied range only 4
Specied range only 5
Specied range only 6
Specied range only 7
Specied range only 8
Specied range only 9
Specied range only 10
Specied range only 11
Specied range only 12
Rapidly 13
Rapidly 14
1
2
3
23
Specications of Lighting Up / Blinking LEDs
24
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