IR testing - results creep up!

[pencilpusher]

If I notice this, which I have in the past, I continue to keep the test button pressed in on my Fluke tester until it bleeps and enter the final figure displayed:thumbsup

My Megger doesn't beep, it just keeps counting until it stabilises OR hits >999 M ohms.

 

[IQ Electrical]

Absolutely, that's 300 million Ohms!

 

[Engineer54]

lol

I imagine holding the test button for that length of time would be similar to holding the lever on a hand-grenade with the pin removed lol

No push test button, just an on/off switch a KV increment dial, and a timer. Bit more complicated than that, but that's the basics... lol!!!

 

[spark 68]

My experiences of pressure testing are a bit simpler lol,

IR test @ 1000V ,Hold trigger on the flash testing gun for 30 seconds, push 2.5kV AC through the switch gear for 30s, then IR test it all again @1000V. This was for simple type testing.

Edit: should have said for LV switchgear

 

[nicsin02]

my lecturer at college suggested it was due to heat in the circuit