"Windmill" wrote in message
...
Mike Tomlinson writes:

In article , Arfa Daily
writes
Even more annoying is that I have damaged the
meter by my own stupidity
Measured the resistance of the mains?

You too, eh?
But they are indeed tough beasts; apart from a shaky ohms-adjust pot
it's still working 25 years later.

Doubtful if you could do that with a modern DVM and get away with it.


My first ever DMM was fished out of the bin where I worked at the time, Ohms
& ACV didn't work.

When I opened it there was an OP-AMP in the middle of the PCB - it was sort
of easiest to try replacing that and it actually fixed the fault!

The employer very kindly loaned me a recently calibrated instrument and an
assortment of adjustable PSUs and resistance decade boxes so I could make
the neccessary adjustments to the presets next to the OP-AMP.

I still have it but its been relegated to the shed for occasional automotive
work.