TKHL loop resistance tester Currently, the contact resistance measurement commonly used in conventional power system of QJ44 type DC bridge arms, and such bridge only mA test current level, is difficult to find the loop conductor cross-sectional area to reduce defects in the measurement of high voltage When the switch contact resistance of the conductive circuit, due to the impact of oil film between the contact and the oxide layer, the measured value is several times larger, can not reflect the real value of the contact resistance. To this end, the Ministry standard SD301-88 "500KV AC power equipment and preventive testing procedures" and new "preventive test code for electrical equipment" to the circuit breaker, disconnecting switch contact resistance measuring current is not less than the prescribed DC 100A is, to ensure that test results are accurate. TKHL loop resistance tester according to the People's Republic of China is the latest implementation of the standard electricity DL / T845.4-2004, using high-frequency switching power supply technology and digital circuit technology combined with the design. Loop resistance tester for switching control equipment loop resistance measurement. The test current national standards recommended by the DC 100A and 200A. In the case of the current can be directly measured 100A loop resistance can also be measured directly 200A loop resistance at a current case, the final test results are digitally displayed. The instrument measurement accuracy, stable performance, with the power, the electricity sector field high-voltage switchgear maintenance and high voltage switch factory loop resistance test requirements. Another name http://www.whgdmk.com/aspcms/product/2014-4-30/88.html contact resistance tester, switch loop resistance tester, the contact loop resistance tester, contacts (circuit) resistance tester http : //www.whgdmk.com product features 1, high-current: loop resistance tester using the latest power supply technology to a long continuous output high current pulsed power to overcome the drawbacks of the current moment, can effectively breakdown switch contact the oxide film, get good test results, immunity: in case of serious disturbances, the LCD screen last bit data can be stabilized within ± 1 word range, the reading is stable and repeatable 3, long life: all High-precision resistors, reduce the effects of ambient temperature on measurement results, while enhancing the use of military connectors 4 vibration performance, easy to carry: small size, light weight