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The claimed accuracy in my 1960's Avo 7 manual says, for DC, 1% of full-scale value over the range. For AC 2.5% from 25Hz to 2kHz. You can read the scale accurately because of the blade pointer and non-parallex mirror, so you adjust the position of your head to view from exactly above the pointer.I wonder what the accuracy is like on the old stuff
Did they have calibration back in those days ?
The vintage avo stuff is cheap, investment opportunity I reckon, helps if you know how to repair them
Yes to calibration, but in the days pre-ISO9001, tended to be MoD, Aviation, Laboratories, some manufacturing industries etc, rather than the average electrician I think ?
There's a vintage MOD Avo calibrator on eBay at the moment, but no idea what it was for!
Avo valve testers go for lots of £££ ?