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Reading

Hi guys,I'm getting a 0.00 reading at the mains for loop impedance and fairly low readings on the circuits.My r1+r2 is higher that all the loop readings on each circuit.This has never happened to me before.Can someone explain why?
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  • MHRestorations:

    Depends on the make of meter, but I've had issues with Megger 17xx series with loose connections on the input jacks. Using a 3 wire LO current test will give lower readings that 2 wire High current due to intermittent contact.


    not my tester (I'm not the QS on the job, just the guy who knows the connections are dodgy..). Repeated 'calibrations' haven't fixed the fault. It drives me mental


    My Megger 17xx would occasionally give 0.00 readings. New leads made no difference but replacing the connector block sorted the problem - he put a good dose of conductive gel on the internal pins for good measure.


    The instrument MI's also say that 2-high will give the most accurate readings, with 2-lo the least.


    F


Reply
  • MHRestorations:

    Depends on the make of meter, but I've had issues with Megger 17xx series with loose connections on the input jacks. Using a 3 wire LO current test will give lower readings that 2 wire High current due to intermittent contact.


    not my tester (I'm not the QS on the job, just the guy who knows the connections are dodgy..). Repeated 'calibrations' haven't fixed the fault. It drives me mental


    My Megger 17xx would occasionally give 0.00 readings. New leads made no difference but replacing the connector block sorted the problem - he put a good dose of conductive gel on the internal pins for good measure.


    The instrument MI's also say that 2-high will give the most accurate readings, with 2-lo the least.


    F


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