Insulation Testing Query

[Jonny72]

Nothing wrong with a DiLog. A mate has had one for years and it does the job. It's good you've ordered a CalCard.

Is it a 9083P? If so I have a slighly quirky theory....

The specs on those are a little confusing, the Display Range for IR is <200M but the highest measuring range is 20M to 100M according to the manual.
View attachment 113147

One reading of the above could be that the 250v test was within 100M +5% so it showed the value, and the 500v test warmed things up a little and things improved and it went off the scale....

A CalCard is the way forwards.

Mate I cancelled the card but got hands on some 0.20 ohm and 20Mohm resistors for 1 quid. I quickly soldered onto a board and have my own Cardcard with 0.2, 0.4, 0.8,, 20M, 100M and 200M tests. And it works. also Dialog machine doing fine. Yes 10 mins work but saves .e 20 quid. Just a cheap skate really

 

[timhoward]

Mate I cancelled the card but got hands on some 0.20 ohm and 20Mohm resistors for 1 quid. I quickly soldered onto a board and have my own Cardcard with 0.2, 0.4, 0.8,, 20M, 100M and 200M tests. And it works. also Dialog machine doing fine. Yes 10 mins work but saves .e 20 quid. Just a cheap skate really

It sounds as though we are similar.... here is my DIY EV tester in use today....! Total of £38 spent. (I did have a proper one but it is still nowhere to be found)

 

[Jonny72]

It sounds as though we are similar.... here is my DIY EV tester in use today....! Total of £38 spent. (I did have a proper one but it is still nowhere to be found)
View attachment 113266

Tim - shear brilliance mate