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Old 19th Jul 2021, 4:18 pm   #1
Join Date: Apr 2021
Location: Redhill, West Sussex, UK.
Posts: 275
Default VTVM - AC range capacitor voltage rating?

Am restoring a VTVM and the AC range input cap has a rating marked 1000 WVDC. It appears original - plus age and make appear to match all others in the unit.

The VTVM has a maximum input range of 1500 V AC or DC. The 1500 AC is specified as RMS, or 4200 p-p, as you'd expect.

As I understand it, DC rating of a capacitor exceeds the AC rating by definition of the RMS factor of root 2.

Sorry if I'm being a bit dim here, but what makes a 1kV DC cap suited to this 1500V AC application?

The VTVM has a tube rectifier on the AC range.

Thank you for your help.
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