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Postato il 11/23/2022 :  02:32:58  Mostra profilo  Rispondi con Quote Introduction#65306;
At present conventional QJ44 type double-arm DC bridges are commonly used in power systems to measure contact resistance and the test current of such bridges is only mA level and it is difficult to find defects in reducing the cross-sectional area of the loop conductor. When measuring the contact resistance of the high-voltage switch conductive loop the measured value is several times larger due to the influence of the oil film and the oxide layer between the contacts and the contact resistance value cannot be truly reflected. To this end the latest Ministry of Power Standard DL/T845.4-2004 "General technical requirements for resistance measuring devices: loop resistance tester" and the new version of the verification procedures JJG1052-2009 "loop resistance tester straight resistance test procedures" made a measurement ( Isolation) The measuring current of the contact resistance of switches circuit breakers etc. is not less than DC 100A and the minimum current maintenance time is not less than 60S ensuring accurate test results.

Technical Parameters#65306;

Measuring range 0#65374;2999.9#956;#937;
Resolution 0#65374;99.99#65292;0.01#956;#937; ; 100.0#65374;2999.9#65292;0.1#956;#937;
Test current DC 50A 100A 150A 200A four-speed fixed output
measurement accuracy ±(0.5% rd+2d)
Continuous working time 5s#65374;599s
Display method Large screen Chinese LCD display
communication mode U disk dump
Working power AC220V±10% 50Hz
Total power 1200W
Maximum storage record 200
working environment Temperature -10 ° C ~ 40 ° C humidity#65306;#8804;80%RH
Dimensions 380×310×260 mm3
Weight 11kg(No attachments)
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