UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Craig Sawyers · 6th Nov 2019, 9:25 am

OK it is different on a MkIII when on the 1000V range. At your test frequency of 7.5kHz it measures high. So 500V at 1kHz measures 500V. At 7.5kHz it measures 600V. So +20%

A Mk 6 has an even greater error - at 7.5kHz it measures 666V. So +33%

Quite different to the 10V range, presumably because of inductive and capacitive effects in the high value dropping resistors on the higher voltage range.

Craig

6th Nov 2019, 9:25 am	#6
Craig Sawyers Dekatron Join Date: Nov 2010 Location: Oxford, UK. Posts: 4,982	Re: AVO Meter, frequency response. OK it is different on a MkIII when on the 1000V range. At your test frequency of 7.5kHz it measures high. So 500V at 1kHz measures 500V. At 7.5kHz it measures 600V. So +20% A Mk 6 has an even greater error - at 7.5kHz it measures 666V. So +33% Quite different to the 10V range, presumably because of inductive and capacitive effects in the high value dropping resistors on the higher voltage range. Craig