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Dear Client
Thank you for Purchasing our HTHL-100B 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-100B
- Page 1 Dear Client Thank you for Purchasing our HTHL-100B 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.
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Page 5: Table Of Contents
Contents 1、Overview....................6 ................. Functions 、 ................... Features 、 ................4、Specifictions ................5、Panel Layout ............6、Measurement Principle ..............7、Operating Method 8、Matters Needing Attention.............. 12 9、Fault Phenomenon And Elimination..........12 10、Packing List..................14 Appendix 1: Basic knowledge of contact resistance. 错误！未定义书签。 Appendix 2: Circuit Breaker Conductive Loop Resistance Standard Reference Value.............. -
Page 6: 1、Overview
1.Overview At present, the measurement of contact resistance in the power system generally uses the conventional QJ44 type double-arm DC bridge, and the test current of this type of bridge is only mA level, it is difficult to find the defect of reducing the cross-sectional area of ... -
Page 7: Functions
final test results are displayed numerically. The instrument has accurate measurement and stable performance, and meets the requirements of on-site high-voltage switch maintenance and high-voltage switch factory loop resistance test in power and power supply departments. 2.Function The instrument is suitable for high-precision measurement of high-voltage switch contact resistance (loop resistance), and is also suitable for other... - Page 8 effectively eliminate the influence of ambient temperature on the measurement results. At the same time, the use of military connectors enhances the anti-vibration performance. 4. Easy to carry: small size and light weight. 4. Specifictions 1. Measurement range: 1 ~ 1999μΩ 2.
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Page 9: 5、Panel Layout
5.Panel Layout Figure 1 Panel structure 1.Resistance display 2、Grounding Rod 3.Current Output （μΩ） ＋ 4 、 Measurement 5.Measurement input 6 、 Current Output input U＋ U－ I－ 7、Power outlet 8、Power switch 9、Test button 10.Current Selection Switch... -
Page 10: 6、Measurement Principle
6.Measurement Principle This instrument adopts the principle of current and voltage method, also known as four-wire method test technology. The block diagram of principle is shown in Figure 2. Fig. 2 Test schematic diagram By the current source through the "I+, I-" two ports (also known as the I-port), to supply the measured resistance Rx current, the size of the current has ammeter I read out, Rx voltage drop "U+, U-"... - Page 11 4 terminal wiring diagram Wrong wiring method Fig. 3 and 4 terminal wiring diagram 2. The connection between the instrument panel and the test line should be tight and there should be no looseness. 3. It should be wired according to the four-terminal method, that is, the current line should be clamped on the outside of the test object, and the voltage line should be clamped inside the test object.
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Page 12: 8、Matters Needing Attention
6. After the measurement is completed, disconnect the power switch, and collect the test cable clamp and put it into the accessory bag. 8.Matters Needing Attention 1. Please read the instructions carefully before using the instrument. 2. Please follow the correct wiring method on the instruction manual. - Page 13 no display on LCD screen Check whether the fuse in the base of the fuse is blown Check if the "test" key is pressed resistance value Check whether the current output line displayed at 0. is well connected and not in good contact.
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Page 14: Appendix 1: Basic Knowledge Of Contact Resistance
10 Packing List 1、Host 2、Special test line (two high current lines 6m, two high current test clips, two voltage test lines 6m) 3、Ground wire 4、5A Fuse 5、Accessory package 6、AC220V Power Cord 7、Instruction manual 8、Certificate 9、Inspection report Appendix 1: Basic knowledge of contact resistance 1. - Page 15 resistance of the contact part of the moving and static contacts. 3. What is the reason for the failure of the circuit breaker contact resistance? - The contact burns out when a large short-circuit current is broken. - Due to poorly adjusted mechanism, the stroke is not fixed, resulting in a change in stroke.
- Page 16 - Contact form: point contact, line contact, face contact. - Contact surface condition: When the contact surface forms an oxide film (except for silver), the oxide film is much larger than the metal itself. - Contact pressure. - the roughness of the contact surface. Appendix Circuit Breaker...
- Page 17 DW2-110 KW3-220 KW1-110 KW4-220 KW3-110 DW2-220 1520 KV4-110A DW3-220 1200 DW3-110G 1600—1800 SW6-330 ＞600...
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