HT HT78 User Manual
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HT HT78 User Manual

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GlobalTestSupply
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.com
Find Quality Products Online at:
sales@GlobalTestSupply.com

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Summary of Contents for HT HT78

  • Page 1 ENGLISH User manual GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...

  • Page 2: Table Of Contents

    HT78 Table of contents: SAFETY PRECAUTIONS AND PROCEDURES ............2 1.1. Preliminary ........................2 1.2. Before use ......................... 3 1.3. After use ..........................3 1.4. Measuring (overvoltage) categories definitions..............3 GENERAL DESCRIPTION ...................4 2.1. TRMS and MEAN VALUE measuring instruments............4 2.2.

  • Page 3: Safety Precautions And Procedures

    HT78 1. SAFETY PRECAUTIONS AND PROCEDURES This meter complies with IEC/EN61010-1. For your own safety and in order to avoid damaging the instrument, you’re recommended to keep to the instructions contained in this manual and read carefully all the notes preceded by the symbol Take extreme care for the following conditions while measuring: •...

  • Page 4: Before Use

    HT78 1.2. BEFORE USE Always keep to the instructions contained in this manual: CAUTION Non compliance with the warnings and/or the instructions may damage the tester and/or its components or injure the operator. • When the clamp is connected to the circuits to be tested, never touch unused terminals •...

  • Page 5: General Description

    HT78 2. GENERAL DESCRIPTION HT78 meter can performs the herewith features: • AC TRMS current measurement up to 3000A • AC leakage current measurement with 0.1mA resolution • DC voltage analogical output for connection with external data loggers • 150Hz low-pass filter for reduce harmonic components of input signal Each feature can be selected by using rotation selector on meter’s front panel.

  • Page 6: Preparation For Use

    HT78 3. PREPARATION FOR USE 3.1. INITIAL The meter has been checked from a mechanical and electrical point of view before shipment. Every care has been taken to make sure that the instrument reaches you in perfect conditions. However, it’s advisable to make a rapid check in order to detect eventual damages which may have occurred in transit.

  • Page 7: Operating Instructions

    HT78 4. OPERATING INSTRUCTIONS 4.1. INSTRUMENT DESCRIPTION 4.1.1. Front panel LEGEND: 1. Inductive clamp jaw 2. Holes for carrying straps 3. LOCK selector 4. Selector with measurement ranges and ON/OFF feature 5. Jaw trigger 6. FILTER selector 7. D-HOLD key 8.

  • Page 8: Description Of Parts

    HT78 4.2. DESCRIPTION OF PARTS 4.2.1. Range and ON/OFF selector Rotate the function selector from “OFF” position to any other position to turn on the meter. Rotate again the selector to “OFF” position to switch off the meter 4.2.2. D-H key Press D-HOLD key to enable Data HOLD feature.

  • Page 9: Dc Analogical Output

    HT78 4.2.6. DC analogical output The meter is designed with a DC voltage analogical output depending on the measured current value and can be used for connection with external data loggers, digital multimeters, etc.. (see Fig. 2) by using customized cables...

  • Page 10: How To Perform The Measurements

    HT78 4.3. HOW TO PERFORM THE MEASUREMENTS 4.3.1. AC Current measurement CAUTION Do not perform any AC current measurement on circuit with nominal voltage higher to 500V to round to avoid possible electrical shocks and to damage the meter Fig. 3: Taking AC current measurement 1.

  • Page 11: Leakage Current Measurement On Single Phase System

    HT78 4.3.2. Leakage current measurement on Single phase system CAUTION Do not perform any AC current measurement on circuit with nominal voltage higher to 500V to round to avoid possible electrical shocks and to damage the meter Fig. 4: Taking leakage current measurement on Single phase systems 1.

  • Page 12: Leakage Current Measurement On Three Phase System

    HT78 4.3.3. Leakage current measurement on Three phase system CAUTION Do not perform any AC current measurement on circuit with nominal voltage higher to 500V to round to avoid possible electrical shocks and to damage the meter Fig. 5: Taking leakage current measurement on Three phase systems 1.

  • Page 13: Maintenance

    HT78 5. MAINTENANCE 5.1. GENERAL INFORMATIONS 1. This clamp is an accured instrument. Whether in use or in storage, please do not exceed the specification requirements to avoid possible damages or dangers. 2. Do not place this meter at high temperatures or humidity or expose it to direct sunlight.

  • Page 14: Technical Specifications

    HT78 6. TECHNICAL SPECIFICATIONS 6.1. CHARACTERISTICS Accuracy is indicated as [% rdg + (number of dgt) * resolution] referred to: 23°C(73°F) ± 5°C(41°F); RH< 80% AC TRMS Current Range Resolution Accuracy Bandwidht Max input current 300mA 0.1mA 3Arms 0.001A 30Arms ±(1.5%rdg+ 8dgt)

  • Page 15: Environmental Conditions

    This product conforms to the prescriptions of the European directive on low voltage 2006/95/EEC (LVD) and to EMC directive 2004/108/EEC 6.3. ACCESSORIES 6.3.1. Standard accessories The content of a standard package is the following: • Instrument HT78 • Carrying bag • Batteries • Set of belt straps • User manual GlobalTestSupply www.

  • Page 16: Service

    HT78 7. SERVICE 7.1. WARRANTY CONDITIONS This equipment is guaranteed against material faults or production defects, in accordance with the general sales conditions. During the warranty period (one year), faulty parts may be replaced. The manufacturer reserves the right to decide either to repair or replace the product.

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