Hioki CT6711 Instruction Manual
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Hioki CT6711 Instruction Manual

Hioki CT6711 Instruction Manual

Current probe
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CT6710
CT6711
CURRENT PROBE
Aug. 2020 Revised edition 1  
CT6710A961-01 20-08H
HIOKI CT6710A961-01
   Instruction Manual
EN

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  • Page 1 CT6710 CT6711    Instruction Manual CURRENT PROBE Aug. 2020 Revised edition 1   CT6710A961-01 20-08H HIOKI CT6710A961-01...
  • Page 2 HIOKI CT6710A961-01...
  • Page 3 • Connect the termination unit to your waveform measuring instrument. • Execute demagnetization and automatic zero- adjustment. Measuring Currents (p.  4 1) • Clamp the sensor around a conductor to be measured. • Measure a current. Finishing Measurement (p.  6 5) CT6710A961-01 HIOKI CT6710A961-01...
  • Page 4 Connection Example Waveform measuring instrument Power source Load Model 3269 Power Supply See “Example of connection to the circuit to be measured” (p.  4 9). HIOKI CT6710A961-01...

  • Page 5: Table Of Contents

    Specifications of Lighting Up / Blinking LEDs ..22 Current Measurement Inspecting the Device Before Use ......26 Preparing for Measurement ........28 Providing power to the CT6710/CT6711 ....... 29 Executing demagnetization and automatic zero-adjustment ..............33 Measuring Currents ..........41 How to measure a current ............
  • Page 6 Consumption current ............81 Influence of common-mode voltage ........82 Maintenance and Service Troubleshooting ............84 Before sending back your device for repair ......85 Errors ............... 88 Types of errors ..............89 Cleaning ..............96 Disposal ..............97 Index Warranty HIOKI CT6710A961-01...

  • Page 7: Introduction

    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.

  • Page 8: Notations

    Indicates useful advice concerning device NOTE performance and operation. Indicates a high-voltage hazard. Failure to verify safety or improper handling of the device could lead to electric shock, burn injury, or death. HIOKI CT6710A961-01...
  • Page 9 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. HIOKI CT6710A961-01...
  • Page 10 Indicates additional information is described below. Bold Indicates the names of the control keys. Accuracy Hioki defines tolerances for measured values in terms of percentage of reading, as indicated below. Reading (Displayed value) Indicates the value the measuring instrument rdg.

  • Page 11: Checking Package Contents

    Pay particular attention to keys and connectors. If you find any damage or discover that the device does not perform as indicated in its specifications, please contact your authorized Hioki distributor or reseller. Check that the package contents are correct.
  • Page 12 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.

  • Page 13: Safety Notes

    If using an electrical measuring instrument „ for the first time, seek instruction from an individual with electrical measurement experience first. Failure to do so may lead to electric shock, overheating, fire, arcing due to a short-circuit, or other hazards. HIOKI CT6710A961-01...

  • Page 14: Usage Notes

    DANGER Do not use the device for measuring bare „ conductors. Take measurements at a location on an „ insulated wire with sufficient insulation for the circuit voltage. Doing so may result in electric shock or a short-circuit. HIOKI CT6710A961-01...
  • Page 15 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. HIOKI CT6710A961-01...
  • Page 16 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. HIOKI CT6710A961-01...
  • Page 17 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 „...
  • Page 18 Keep the upper jaw locked in place when the „ 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. HIOKI CT6710A961-01...

  • Page 19: Overview

    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...

  • Page 20: Product Features

    Warning LED lights (p.  1 8) 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). HIOKI CT6710A961-01...
  • Page 21 1 mA to 50 A. Broad frequency band (p.  7 1) Model CT6710: DC to 50 MHz Model CT6711: DC to 120 MHz Demagnetizing and automatic zero-adjustment functions (p.  3 3) You can use a single key to demagnetize the magnetic cores and correct variations in offset voltage, both of which are required before measuring.

  • Page 22: Name And Function Of Each Part

    Name and Function of Each Part 1.3 Name and Function of Each Part Termination unit See p.  3 4 and p.  3 5. Top view HIOKI CT6710A961-01...
  • Page 23 Do not remove this sticker as the number is important. Power plug Power is provided to the CT6710/CT6711 through this plug. Connect this plug with the 3269 Power Supply. Shell Pull on the power plug while simultaneously pulling this shell to disconnect the plug.

  • Page 24: Junction Box (Keys, Leds)

    (Does not switch from the 30 A range to the 0.5 A range) (Lower range) key (p.  5 3)  Switch over to a next lower current range. (Does not switch from the 0.5 A range to the 30 A range) HIOKI CT6710A961-01...
  • Page 25 LEDs (green lights) • Lights up when its current range is chosen (p.  5 3). (Normal operation) • Blinks rapidly when the device has entered protection mode (p.  6 2) or a checksum error has occurred (p.  9 5). HIOKI CT6710A961-01...

  • Page 26: Sensor

    Do not apply force or mechanical shock to the „ device. Do not subject the device to static electricity. „ Doing so could damage the device. When the upper jaw is unlocked See p.  4 1. Top view See p.  4 1. See p.  4 1. HIOKI CT6710A961-01...
  • Page 27 If this indicator appears, the upper jaw is not locked in place. Opening lever To retract and extend the upper jaw, always operate this lever. This lever allows you to retract and lock the upper jaw in place. HIOKI CT6710A961-01...

  • Page 28: Specifications Of Lighting Up / Blinking Leds

    • 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.  6 2). HIOKI CT6710A961-01...
  • Page 29 *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. HIOKI CT6710A961-01...
  • Page 30 Specifications of Lighting Up / Blinking LEDs HIOKI CT6710A961-01...

  • Page 31: Current Measurement

    Do not scratch the facing core surfaces between the „ sensor heads. Do not touch the facing core surfaces. „ Do not insert any foreign object into the gap around „ the sensor heads. Doing so could adversely affect the measurement accuracy and the retracting/extending mechanism. HIOKI CT6710A961-01...

  • Page 32: Inspecting The Device Before Use

    • Model 3269 Power Supply (available as an option) • Waveform measuring instrument (such as oscilloscope and recorder) Connecting the CT6710/CT6711 to a Hioki Memory HiCorder with a power supply module for current probes (option) installed allows the CT6710/CT6711 to operate without the 3269 Power Supply.
  • Page 33 Z Have the device repaired. blinking second after the device The device is damaged. is turned on? Is the insulation of Do not clamp the sensor „ each conductor to be around any damaged measured damaged? conductor. The inspection is completed. HIOKI CT6710A961-01...

  • Page 34: Preparing For Measurement

    3269. Supplying a voltage that falls outside the specified range to the 3269 could damage the CT6710/CT6711 or the 3269, causing bodily injury. NOTICE Always operate the opening lever to retract, „...

  • Page 35: Providing Power To The Ct6710/Ct6711

    The consumption current of the CT6710/CT6711 depends on current under measurement. One unit of the 3269 can simultaneously provide power to up to two current probes (the CT6710/CT6711) each of which measures a current with the maximum rated current value. For information about the consumption current, see “Consumption current”...
  • Page 36 Preparing for Measurement How to provide the power to the CT6710/CT6711 Ensure that the POWER switch of the 3269 Power Supply is set to OFF. Connect the power cord to the power inlet on the back of the 3269 Power Supply.
  • Page 37 Preparing for Measurement Set the POWER switch of the 3269 Power Supply to the ON position. The LEDs of the CT6710/CT6711 and the 3269 will light up or blink as follows: Model 3269 POWER indicator will light up. Model CT6710/CT6711...
  • Page 38 Preparing for Measurement Wait for 30 minutes or more. Wait at least 30 minutes after starting to supply power to the CT6710/CT6711 to accurately measure a current before executing demagnetization and automatic zero- adjustment. See “Executing demagnetization and automatic zero-adjustment” (p.  3 3).

  • Page 39: Executing Demagnetization And Automatic Zero-Adjustment

    DEMAG / AUTO ZERO „ key when the sensor is clamped around a conductor under measurement. Conductor under measurement Do not hold down the key. Doing so will start magnetization, causing bodily injury or damage to the circuit under measurement. HIOKI CT6710A961-01...
  • Page 40 Doing so could damage the output terminal on the termination unit or the BNC input terminal on the waveform measuring instrument. Do not short-circuit the output terminal „ Do not apply voltage to the output terminal. „ Doing so could damage the device. HIOKI CT6710A961-01...
  • Page 41 BNC terminal through a conversion plug, make sure that the polarity is as follows: BNC center contact: Positive Outer conductor: Ground potential (or negative) Failure to do so may damage the device and your waveform measuring instrument. HIOKI CT6710A961-01...
  • Page 42 DEMAG / AUTO ZERO LED blinks slowly in the following states: • The power supply to the CT6710/CT6711 just started. • A current exceeding the rated current was inputted to the device, but this condition was resolved. (The current value fell below the rated value or stopped. Otherwise, the sensor was removed from the conductor under measurement.)
  • Page 43 The upper jaw will be locked in place. JAW UNLOCKED will go out. Do not clamp the sensor around any „ conductor. Set the input coupling of your waveform measuring instrument to GND, then adjust the zero position of the display. HIOKI CT6710A961-01...
  • Page 44 The connection can be established with the unlock lever of the termination unit pointing up, regardless of whether the pair of the locking studs in the BNC input terminal on the waveform measuring instrument is fixed in the horizontal or vertical orientation. Vertical Horizontal HIOKI CT6710A961-01...
  • Page 45 DEMAG / AUTO ZERO LED will light up. Demagnetization and automatic zero-adjustment will start. Green will light up Orange will light up After the completion, the DEMAG / AUTO ZERO will go out. Green will light up Orange will go out HIOKI CT6710A961-01...
  • Page 46 When you halt demagnetization or automatic zero- adjustment, re-execute demagnetization and automatic zero-adjustment before taking a measurement. To execute automatic zero-adjustment alone (without executing demagnetization) Z Press the DEMAG / AUTO ZERO key momentarily (Do not hold down the key). (p.  1 8) HIOKI CT6710A961-01...

  • Page 47: Measuring Currents

    See “Frequency derating curve” (p.  7 8). The maximum measurement current varies with the frequency, and the current that can be measured continuously is limited. Operating the device at less than this limitation is referred to as derating. HIOKI CT6710A961-01...
  • Page 48 Model 3269 Power Supply If you do so, a short-circuit current will flow through the 3269 Power Supply and the CT6710/CT6711 from the ground terminal, causing electric shock or damage to the CT6710/CT6711 and the 3296. See the figure in “Example of connection to the circuit to be measured”...
  • Page 49 „ clamping the sensor around the conductor. Damage to the conductor insulation can cause electric shock. Connect the CT6710/CT6711 to the 3269 Power „ Supply and a waveform measuring instrument (oscilloscope or recorder) before clamping the device around a live line to be measured.
  • Page 50 Keep away any cords and other parts, which „ include the cords of the device, from the conductor under measurement. Dielectric heating may cause heating of cords and other parts, resulting in burns. HIOKI CT6710A961-01...
  • Page 51 When the device is clamped around one of the go- and-return conductors and the other conductor is placed close to the jaws, self-heating of both currents will synergistically heat up the sensor heads even if the electric current is lower than the maximum rated current. HIOKI CT6710A961-01...
  • Page 52 * The maximum rated current has been specified in light of a temperature increase caused by self-heating during measurement. The maximum rated current varies depending on the frequency of the current under measurement. See the figures in “Frequency derating curve” (p.  7 8).” HIOKI CT6710A961-01...
  • Page 53 See “Frequency derating curve” (p.  7 8). Connect the device and other probes properly „ to a circuit to be measured and your waveform measuring instrument. Improperly connecting them could cause electric shock or damage to the device, other probes, and instrument. HIOKI CT6710A961-01...
  • Page 54 Keep the upper jaw locked in place except the „ following occasions: • When clamping the sensor around a conductor to be measured • When removing the sensor from the conductor. Leaving the upper jaw unlocked can damage the device. HIOKI CT6710A961-01...
  • Page 55 The 3269 Power Supply can provide the power to up to two probes of the CT6710/CT6711. Connecting the CT6710/CT6711 to a Hioki Memory HiCorder with a power supply module for current probes (option) installed allows the CT6710/CT6711 to operate without the 3269 Power Supply.

  • Page 56: How To Measure A Current

    Be sure to execute demagnetization and automatic „ zero-adjustment before taking measurements. Failure to do so can adversely affect the measurement accuracy. See “Executing demagnetization and automatic zero- adjustment” (p.  3 3). HIOKI CT6710A961-01...
  • Page 57 • Place the conductor at the center of the sensor aperture. Slide the opening lever toward the lower jaw until JAW UNLOCKED indicator is hidden. The upper jaw will be locked in place. JAW UNLOCKED will go out. HIOKI CT6710A961-01...
  • Page 58 - Currents that exceed the defined level on a momentary basis - High-frequency currents that exceed the defined level Any other LEDs lights up or blinks. A different error is occurring. Z See “4.2 Errors” (p.  8 8) to identify a reason and take necessary measures. HIOKI CT6710A961-01...
  • Page 59 Recommended current range Electric current level (Output rate) ±5 A to ±50 A 30 A (0.1 V/A) ±0.5 A to ±5 A 5 A (1 V/A) ±1 mA to ±0.5 A 0.5 A (10 V/A) HIOKI CT6710A961-01...
  • Page 60 10 mV/div measures a current that has an RMS value of 1 mA 0.5 A range (10 V/A) 5 A range (1 V/A) = (10 ×10 ) / 10 = (10 × 10 ) / 1 = 1 × 10 (A/div) = 10 ×10 (A/div) HIOKI CT6710A961-01...
  • Page 61 • Clamp the sensor at the center of the straight portion of the conductor as close as possible. • Arrange the conductor at the center of the sensor aperture as close as possible. • Do not wind the conductor around a jaw. HIOKI CT6710A961-01...
  • Page 62 As needed, reduce the frequency band of the waveform measuring instrument, or clamp the sensor around the low- potential side conductor. Power Load source Displayed values can frequently fluctuate due to induction potential even when no voltage is applied. This, however, is not a malfunction. HIOKI CT6710A961-01...
  • Page 63 • An increase in the resonant sound while the device is in use may indicate that the gap between the upper and lower heads has widened. The gap may adversely affect the measurement accuracy. Calibrating the device is recommended. See “Maintenance and Service” (p.  8 3). HIOKI CT6710A961-01...

  • Page 64: To Measure A Low Current

    Clamp the sensor around the loops in a bundle. This will make the conductor pass through the sensor aperture one time more than the loop count consecutively in one direction. Arrange the loops radially as shown on the following page. Measure the current. HIOKI CT6710A961-01...
  • Page 65 φ 200 mm or more Arrange loops radially. High-potential Low-potential side side (Grounded side) HIOKI CT6710A961-01...

  • Page 66: To Measure A Current Accurately

    DEMAG / AUTO ZERO will go out. Wait for about 5 minutes. The fluctuation in the offset voltage will stabilize. Operate the opening lever of the sensor back and forth to retract and extend the upper jaw 4 or 5 times. HIOKI CT6710A961-01...
  • Page 67 Press LED will light up. (Do not hold down) Automatic zero-adjustment will be performed alone. After the completion, the DEMAG / AUTO ZERO will go out. Measure a current. See “How to measure a current” (p.  5 0). HIOKI CT6710A961-01...

  • Page 68: When The Device Has Entered Protection Mode

    When the device has entered protection mode, follow the procedure presented on the following pages to restore it to normal operation. If the device has entered protection mode, it is recommended to re-calibrate it because internal components may have been subjected to thermal stress. HIOKI CT6710A961-01...
  • Page 69 Slide the opening lever toward the lower jaw until the UNLOCKED indicator is hidden. The upper jaw will be locked in place. Wait for a while to let the junction box cool down to a normal temperature. HIOKI CT6710A961-01...
  • Page 70 Press any key DEMAG / AUTO ZERO LED will blink slowly. Perform demagnetization and automatic zero- adjustment. See “Executing demagnetization and automatic zero-adjustment” (p.  3 3). HIOKI CT6710A961-01...

  • Page 71: Finishing Measurement

    NOTICE Do not pull the cord to unplug the output „ terminal. Doing so can damage the cord and output terminal. Hold the termination unit and disconnect the „ output terminal while pulling the unlock lever toward you. HIOKI CT6710A961-01...
  • Page 72 Doing so could damage the cord and the power receptacle of the 3269 Power Supply. While holding the shell (p.  1 7), pull the „ power plug out. Pulling the shell lets the plug be unlocked, so you can disconnect the plug from the power receptacle. HIOKI CT6710A961-01...
  • Page 73 The upper jaw will be locked in place. JAW UNLOCKED will go out. Disconnect the termination unit from the BNC input terminal on the waveform measuring instrument. While pulling the unlock lever, pull out the termination unit straight. HIOKI CT6710A961-01...
  • Page 74 POWER switch of the 3269 Power Supply in the OFF position. Disconnect the power plug of the CT6710/ CT6711 from the 3269 Power Supply. Hold the shell (p.  1 7) of the power plug when you disconnect it. Do not pull the cord.

  • Page 75: Specifications

    Unless otherwise specified, each specification item is applied to both Model CT6710 and Model CT6711. Items with a model number, “(Model CT6710)” or “(Model CT6711),” indicated are applicable to each model. Each item is specified for the device operated at 23°C±5°C (73°F±9°F) and 80% RH (no condensation), 30 minutes elapses...
  • Page 76 Approx. 1500 mm (59.06″) • Between junction box and termination unit Approx. 150 mm (5.91″) • Power cord Approx. 1000 mm (39.37″) Product warranty period 1 year Accessories See “(Accessory)” (p.  5 ) and “Option” Option (p.  6 ). HIOKI CT6710A961-01...

  • Page 77: Specifications Of Input, Output, And Measurement

    Measurement Basic specifications Frequency band DC to 50 MHz (−3 dB) (Model CT6710) DC to 120 MHz (−3 dB) (Model CT6711) See “Frequency characteristics” (p.  7 7) in “3.4 Typical Characteristics.” Rise time (10% to 90%) 7.0 ns or less (Model CT6710) 2.9 ns or less (Model CT6711)
  • Page 78 *1. Depending on the ambient temperature and measurement conditions, internal overheating can result in an overload condition, limiting the maximum rated current lower than those specified here. *2. The device requires to cool down for 10 times the length of time the current was inputted. HIOKI CT6710A961-01...

  • Page 79: Specifications Of Accuracy

    • Accuracy warranty period 1 year (until the upper jaw has been retracted and locked up to 10,000 cycles) • Guaranteed accuracy period after adjustment made by Hioki 0.5 year • Temperature and humidity for guaranteed accuracy 23°C±5°C (73°F±9°F), 80% RH or less •...
  • Page 80 20 mA or less (Model CT6710) (DC and 60 Hz, in a magnetic field of 400 A/m) 5 mA or less (Model CT6711) (DC and 60 Hz, in a magnetic field of 400 A/m) *3. Unless there is any change in the state of the facing core surfaces, which includes scratches, adhesion of foreign objects, or any change in the operating environment.

  • Page 81: Specifications Of Functionality

    ZERO key (1 s). • Automatic zero-adjustment Operation: Executes automatic zero- adjustment alone. DEMAG / AUTO ZERO Means: Press the key. Jaw-unlocked detection When the upper jaw is not locked in place, the JAW UNLOCKED LED lights up. HIOKI CT6710A961-01...
  • Page 82 Typical specified-temperature: 80°C Typical hysteresis: 10°C Recovery means: Press any key. Then, the device requires demagnetization and automatic zero-adjustment. Specifications of lighting up / blinking LEDs See “1.4 Specifications of Lighting Up / Blinking LEDs” (p.  2 2). HIOKI CT6710A961-01...

  • Page 83: Typical Characteristics

    Fig. 1 Frequency characteristics (Model CT6710) 0.5 A range (10 V/A) 5 A range (1 V/A) −10 30 A range (0.1 V/A) −20 −30 −40 10 k 100 k 1 M 10 M 100 M Frequency (Hz) Fig. 2 Frequency characteristics (Model CT6711) HIOKI CT6710A961-01...

  • Page 84: Frequency Derating Curve

    If the ambient temperature (T rises or the current under measurement contains high- frequency components, the device temperature will rise, and thus its continuously inputtable current value and frequency will lower. HIOKI CT6710A961-01...
  • Page 85 Fig. 3 Derating curve according to frequency (Model CT6710) 30 A range 5 A range = 23°C, Sine wave 10 k 100 k 10 M 100 M Frequency (Hz) Fig. 4 Derating curve according to frequency (Model CT6711) HIOKI CT6710A961-01...

  • Page 86: Input Impedance

    0.01 0.001 10 k 100 k 10 M 100 M Frequency (Hz) Fig. 5 Input impedance (Model CT6710) 0.01 0.001 10 k 100 k 10 M 100 M Frequency (Hz) Fig. 6 Input impedance (Model CT6711) HIOKI CT6710A961-01...

  • Page 87: Consumption Current

    Typical Characteristics Consumption current Input current (A) Fig. 7 Consumption current (with the 30 A range specified) HIOKI CT6710A961-01...

  • Page 88: Influence Of Common-Mode Voltage

    −60 5 A range 30 A range 30 A range −80 −100 −120 −140 −160 −180 10 k 100 k 10 M Frequency (Hz) : Output voltage (V) : Common-mode voltage (V) Fig. 8 Influence of common-mode voltage HIOKI CT6710A961-01...

  • Page 89: Maintenance And Service

    Attempting the above may cause bodily injury or fire. Calibration The calibration interval depends on factors such as operating conditions and environment. Please determine the appropriate calibration interval based on your operating conditions and environment and have Hioki calibrate it accordingly on a regular basis. HIOKI CT6710A961-01...

  • Page 90: Troubleshooting

    Hioki distributor or reseller. When transporting the device, be sure to observe the following precautions: • Remove the CT6710/CT6711 from the 3269 Power Supply. • Include a memo that describes the problem in detail. • Pack the device in the packaging in which it was initially delivered and double-pack it.

  • Page 91: Before Sending Back Your Device For Repair

    The resonant sound emitted from the sensor heads becomes louder. Calibration of the device is recommended because the gap may adversely affect the measurement accuracy. The gap between the upper and lower sensor heads may have increased. HIOKI CT6710A961-01...
  • Page 92 (p.  3 3). When demagnetization or automatic zero-adjustment has not been normally completed even with the sensor not clamped around any conductor and the upper jaw locked in place, the device may be malfunctioning. Z Send the device for repair. HIOKI CT6710A961-01...
  • Page 93 The waveform outputted during the demagnetization is asymmetric along the horizontal axis. This does not represent a device malfunction. Z After demagnetization and automatic zero-adjustment are completed, make sure that the zero position on the waveform measuring instrument is appropriate. HIOKI CT6710A961-01...

  • Page 94: Errors

    See “1.4 Specifications of Lighting Up / Blinking LEDs” (p.  2 2). When an error occurs, remedy the error according to measures described on the following pages. If the device needs to be repaired, contact your authorized Hioki distributor or reseller. HIOKI CT6710A961-01...

  • Page 95: Types Of Errors

    Z F ollow the procedure on the following page. “When the device has entered protection mode” (p.  6 2) Calibration of the device is recommended. Internal components may have been subject to thermal stress. HIOKI CT6710A961-01...
  • Page 96 When you use the 30 A range Z I mmediately remove the sensor from the conductor under measurement. When you use the 0.5 A range or 5 A range Z S witch a higher current range. HIOKI CT6710A961-01...
  • Page 97 - Currents that exceed the defined level on a momentary basis - High-frequency currents that exceed the defined level • Although external magnetic fields may cause the OVERLOAD LED to blink while the upper jaw is retracted, this does not indicate an issue with the device. HIOKI CT6710A961-01...
  • Page 98 • A current exceeding 0.5 A rms has been detected whether or not the upper jaw is locked. Z Depending on the LED status exhibited after the three blinks, implement the remedy described on the following pages. After that, re-execute demagnetization and automatic zero-adjustment (p.  3 3). HIOKI CT6710A961-01...
  • Page 99 An overload is detected. Z Remove the sensor from the conductor under measurement. Then, slide the opening lever of the sensor toward JAW UNLOCKED the lower jaw until the indicator is hidden to lock the upper jaw in place. HIOKI CT6710A961-01...
  • Page 100 A current exceeding 0.5 A rms has been detected. Z Remove the sensor form the conductor under measurement. Then, slide the opening lever of the sensor toward JAW UNLOCKED the lower jaw until the indicator is hidden to lock the upper jaw in place. HIOKI CT6710A961-01...
  • Page 101 Errors Checksum error All LEDs blink rapidly. An internal CPU error Green (checksum error) has Reds occurred. Z Have the device repaired. Orange Greens Malfunction No LEDs light up. The device is malfunctioning. Z Have the device repaired. HIOKI CT6710A961-01...

  • Page 102: Cleaning

    Dirt on the facing core surfaces can adversely affect the measurement accuracy. If the device becomes dirty, wipe the device clean with a soft cloth moistened with water or a neutral detergent. HIOKI CT6710A961-01...

  • Page 103: Disposal

    Disposal 4.4 Disposal Dispose of the device in accordance with local regulations. HIOKI CT6710A961-01...
  • Page 104 Disposal HIOKI CT6710A961-01...

  • Page 105: Index

    DEMAG / AUTO ZERO LED ............ 19, 23 Blinking slowly ................36 Demagnetization................36 Abnormal operation ..............86 Demagnetization waveform ............. 36, 87 Dielectric heating ................44 Disposal ..................97 Eddy current loss ................44 Error ....................88 HIOKI CT6710A961-01...
  • Page 106 Input impedance ..............26, 80 Jaws ....................21 JAW UNLOCKED indicator ............21 JAW UNLOCKED LED ............19, 23 Junction box .................. 18 Keys....................18 DEMAG / AUTO ZERO .............. 18 Higher range ................ 18, 53 Lower range ................. 18, 53 HIOKI CT6710A961-01...
  • Page 107 Offset voltage ..............36, 50, 60 Opening lever ................21 Option ....................6 Output terminal ................17 Overload ................22, 52, 90 OVERLOAD LED............... 19, 23, 90 POWER LED ................19, 22 Power plug................17, 30 Protection mode ................62 HIOKI CT6710A961-01...
  • Page 108 RANGE LEDs ................19, 23 Resonant sound ..............57, 85 Sensor ................... 20 Sensor heads ................21 Serial number ................17 Service................... 83 Shell....................17 Termination unit ................16 Unlock lever ................... 17 Vents....................17 Waveform Not displayed ................85 HIOKI CT6710A961-01...
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  • Page 112 HIOKI CT6710A961-01...

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Ct6710

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