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Hello,

I have a dedicated loop tester (Martindale EZ2500) and also a Fluke 1662 MFT

The reason I have the additional loop tester is often at work I will need to measure P-E & P-N loop impedance only while I am in a harness climbing, or have walked for ages (large concert touring) the EZ2500 clips to my belt, the fluke is a bit big.

I noticed last week that testing the same socket at home with both testers I got different results.
The EZ2500 was much in need of a new calibration, and the fluke was just coming up to needing annual calibration so I sent them both off

Got them back today, both passed within tolerances.
Did the same test to the same socket and the results are more or less the same:

EZ2500:
P-E: before: 0.22ohm after: 0.24ohm (T-safe)
P-N: before: 0.58ohm after: 0.75ohm
Fluke:
P-E: before: 0.42ohm after: 0.33ohm (Non-trip)
P-N: before: 0.44ohm after: 0.33ohm

These results are different enough to make a big difference to my work BS7909 our testing is a little different from domestic testing, and getting PSCC & PEFC from loop testing is important to us, as we have very long cables. We dont do r1+r2 tests and most of the tests in BS7909 are done live (loop testes, RCD tests)

So why are these results so different and what to do about it, is loop testing a bit vague (or at least non-trip)?

Any ideas, Thanks Marcus
 
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