This may not be the right forum for this but on th offchance that one of you more experienced (older!) readers may be able to help, I am short of ideas.AVO Meter model 8 mark IV, ohms scale will not zero adjust,goes to about 5K only.Other two ohms x100 and ohms/100 are OK.Checked leads,batteries and adjusting pot, all OK. Any clues?Many Thanks.
It's doubtful that it's due to being connected to a voltage, this would normally blow it completely.
What I did recently to overcome this problem, was to lift the unit out of the case and on the zero adjust pot. carefully drill a tiny hole in the casing and then spray in a small quantity of switch cleaner.
Thanks for the feedback guys, nice to know people still remember the 'Rolls Royce' of test meters.I know everyone uses digital meters these days but AVOs are still as accurate (except mine at moment!)if you know how to read them.I used a slide rule at school,just as good and fast as a calculator, I'm not that old either, 48. Thanks again.
Analogue meters still have their use! BT engineers use them to estimate visually the line length to a disconnection fault using the reverse button. The same means can indicate if a socket or phone is present. Can't do that with a digital!