__________________________________________________ Introduction Thank you for purchasing the HIOKI "9277,9278 UNIVERSAL CLAMP ON CT". To obtain maximum performance from the product, please read this manual first, and keep it handy for future reference. Inspection When you receive the product, inspect it carefully to ensure that no damage occurred during shipping.
__________________________________________________ Safety Notes DANGER This product is designed to conform to IEC 61010 Safety Standards, and has been thoroughly tested for safety prior to shipment. However, mishandling during use could result in injury or death, as well as damage to the product.
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__________________________________________________ The following symbols in this manual indicate the relative importance of cautions and warnings. Indicates that incorrect operation presents an extreme hazard that could result in serious DANGER injury or death to the user. Indicates that incorrect operation presents a significant hazard that could result in serious WARNING injury or death to the user.
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__________________________________________________ Measurement categories (Overvoltage categories) This product complies with CATII (600V), CATIII (300V) safety requirements.To ensure safe operation of measurement products, IEC 61010 establishes safety standards for various electrical environments, categorized as CAT I to CAT IV, and called measurement categories. These are defined as follows.
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__________________________________________________ The measurement categories comply with the Overvoltage Categories of the IEC60664 Standards. Accuracy We define measurement tolerances in terms of f.s. (full scale), rdg. (reading) and dgt. (digit) values, with the following meanings: f.s. (maximum display value or scale length) The maximum displayable value or the full length of the scale.
__________________________________________________ Notes on Use Follow these precautions to ensure safe operation and to obtain the full benefits of the various functions. DANGER To avoid short circuits and potentially life- threatening hazards, never attach the UNIVERSAL CLAMP ON CT to a circuit that operates at more than the 600 VAC(CATII) or 300 VAC(CATIII), or over bare conductors.
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__________________________________________________ WARNING To avoid electric shock, do not allow the product to get wet, and do not use it when your hands are wet. To avoid electric shock when measuring live lines, wear appropriate protective gear, such as insulated rubber gloves, boots and a safety helmet. CAUTION Note that the product may be damaged if current exceeding the selected measurement range is...
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__________________________________________________ CAUTION Avoid stepping on or pinching the cable, which could damage the cable insulation. Keep the cables well away from heat sources, as bare conductors could be exposed if the insulation melts. To avoid damaging the cables,do not bend or pull the cables.
__________________________________________________ Chapter 1 Overview 1.1 Product Overview The 9277, 9278 was developed for to provide a 20 A (9277), 200 A (9278) clamp sensor corresponding to AC/DC current. The 9277, 9278 makes it possible to measure AC/DC current in live power lines without cutting into the lines.
__________________________________________________ 1.2 Names of Parts "LOCK" indication Current direction indication Slider Lever Clamp Sensor Sensor head Barrier Cable Output connector "UNLOCK" indication _____________________________________________ Chapter 1 Overview...
__________________________________________________ Chapter 2 Measurement Procedure 2.1 Measurement Procedure CAUTION To avoid damaging the output cable, grasp the connector, not the cable, when unplugging the cable. To prevent damage to the product and sensor, never connect or disconnect a sensor while the power is on.
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__________________________________________________ To measure small current levels, multiple NOTE windings may be used to increase the relative sensitivity. 10 windings multiplies the measured current by about a factor of 10. However, in this case the diameter of the winding should be 20 cm or more, and radial. This product has a resistance in series with the signal output circuits.
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__________________________________________________ 1. Close the clamp jaws when the clamp jaws are opened. 2. Make sure that the unit's power switch is OFF. 3. Connect the clamp-on CT connector to the unit. 4. Turning the power on the unit. 5. Press the DMAG switch to magnetize.
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__________________________________________________ 7. Align the sensor so that the Current direction indication current direction indication Load side corresponds to the direction of current flow through the conductor to be measured, and clamp so that the conductor is in the center of Power supply side the sensor aperture.
DMAG switch with no input on the clamp, to return to normal. If it does not return to normal condition, or even pressing DMAG, the magnetic is remained in the core, contact your dealer or Hioki representative. _____________________________________________ Chapter 2 Measurement Procedure...
__________________________________________________ Chapter 3 Specification Model 9277 9278 Rated current 20 A f.s. 200 A f.s. (AC/DC) Output voltage 2 V/20 A 2 V/200 A (AC/DC) The maximum 50 Arms 350 Arms permissible input (75 Apeak) (500 Apeak) range (DC to 3 kHz) Input resistance (DC) Max.
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__________________________________________________ Model 9277 9278 Effect of external Max. 0.2 A Max. 1 A magnetic field (400 A/m, 55 Hz and DC) Dielectric strength 3536 VrmsAC for 15 seconds. (between case and clamp sensor (aperture)) (between electric circuit and case, between electric circuit and core,...
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ID3 7 signal ID1 8 Identifying signal ID2 9 Identifying signal Shield (cable) Output connector pin array 9277 9278 Connect to GND Connect to GND Connect to GND Mating receptacle RM515ERB-10SD (HIROSE) CAUTION Be careful to avoid connecting voltage improperly, as the internal circuitry may be destroyed.
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__________________________________________________ Frequency 9277 The maximum permissible input range (continuous) Frequency 9278 The maximum permissible input range (continuous) _____________________________________________ Chapter 3 Specification...
Hioki representative. Pack the product carefully so that it will not be damaged during shipment, and include a detailed written description of the problem. Hioki cannot be responsible for damage that occurs during shipment. _____________________________________________ Chapter 4 Maintenance and Service...
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__________________________________________________ _____________________________________________ Chapter 4 Maintenance and Service...
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