HVTest HTHL-200A Manual
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HVTest HTHL-200A Manual

Micro ohmmeter
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Dear Client
Thank you for Purchasing our HTHL-200A Micro Ohmmeter.
Please read the manual in detail prior to first use, which will help
you use the equipment skillfully.
company's products continually, so there may be
slight differences between your purchase equipment
and its instruction manual. You can find the changes
in the appendix. Sorry for the inconvenience. If you have further
questions, welcome to contact with our service department.
may bring voltage, when you plug/draw the test wire or
power outlet, they will cause electric spark. PLEASE
CAUTION RISK OF ELECTRICAL SHOCK!
Company Address:
 T4，No. 41, High-tech 2 Road，East Lake High-tech Development Zone，
Wuhan
 Sales Hotline: 86-27- 87457960
 After Service Hotline: 86-27- 87459656
 Fax: 86-27- 87803129
 E-mail: qiao@hvtest.cc
 Website: www.hvtest.cc
Our aim is to improve and perfect the
The input/output terminals and the test column
1

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Summary of Contents for HVTest HTHL-200A

  • Page 1 Dear Client Thank you for Purchasing our HTHL-200A Micro Ohmmeter. Please read the manual in detail prior to first use, which will help you use the equipment skillfully. Our aim is to improve and perfect the company's products continually, so there may be slight differences between your purchase equipment and its instruction manual.
  • Page 2  SERIOUS COMMITMENT All products of our company carry one year limited warranty from the date of shipment. If any such product proves defective during this warranty period we will maintain it for free. Meanwhile we implement lifetime service. Except otherwise agreed by contract.
  • Page 3 shock, the grounding conductor must be connected to the ground. Make sure the product has been grounded correctly before connecting with the input/output port. Pay Attention to the Ratings of All Terminals To prevent the fire hazard or electric shock, please be care of all ratings and labels/marks of this product.
  • Page 4 －Security Terms Warning: indicates that death or severe personal injury may result if proper precautions are not taken Caution: indicates that property damage may result if proper precautions are not taken.

  • Page 5: Table Of Contents

    Contents I. Overview....................6 II. Functions....................6 III. Features....................7 IV. Specifications..................7 V. Panel Layout..................8 VI. Work Principle................... 8 VII. Operation Methods................. 9 VIII. Problems and Solutions............10 IX. Notes....................10 Appendix A：Basic Knowledge about Contact Resistance..11 Appendix B：Standard Reference for Conducting Loop Resistance of Circuit Breaker............12...

  • Page 6: Overview

    100A to ensure accurate test results. HTHL-200A Portable Micro Ohmmeter measures up to the latest power system standards--DL/T845.4-2004 designed for measuring loop resistance of Switching Control Equipment using High-frequency switching power supply technology and digital circuit technology.

  • Page 7: Features

    test occasions that need high current and micro resistivity. III. Features (1) High current: For latest power supply technology, the tester can continuously output high current which overcomes the weakness of instantaneous current produced by pulsed power. It can effectively breakdown/puncture the oxide layer of the switches and then get precise results.

  • Page 8: Panel Layout

    6、Current Selection 7、Current Output I－ 8、Measurement Input V－ 9、Measurement Input V＋ 10、Current Output I+ VI. Work Principle HTHL-200A Portable Micro Ohmmeter bases on the Current-voltage testing principle that also known as Four-line method testing technology. More details show in Figure 2.

  • Page 9: Operation Methods

    Figure 2 Schematic diagram The current goes through I+ and I- ports to the resistance Rx, current value can be got from the ammeter I, and the voltage between V+ and V- will be shown in the voltmeter V. Based on data I and V, the resistance value can be calculated.

  • Page 10: Problems And Solutions

    220V AC and start the tester. 5. Adjust the “Current Selection” knob to you need fixed output and then press the “Measurement Switch” button, the data displayed in the monitor is the test value of loop resistance. Displaying 1 indicates the loop resistance value is beyond the measurement range.

  • Page 11: Appendix A：basic Knowledge About Contact Resistance

    4. Ground should be connected during the use of this equipment. 5. Arbitrary replacement of current lines is forbidden. 6. The tester should be put in ventilated, dry, cool and cleaning place. Pay attention to humid or erosive gas that may damage this equipment. Appendix A：Basic Knowledge about Contact Resistance 1.

  • Page 12: Appendix B：standard Reference For Conducting Loop

    mechanical strength and resistivity of metallic compound. 2) Contact form: Point contact, line contact and area contact. 3) Situations of contact area: The oxide film formed in contact area (the Silver exception), whose resistance is larger than that of metal. 4) Contact pressure 5) Roughness of contact area Appendix B ：...

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