[Milsurplus] 800 Cycle AC Meter?

[Richard]

There are two types of ac voltmeters, moving iron types, and D'Arsonval 
dc movements with a rectifier.  Moving iron types are much more 
expensive to make, so you're unlikely to see one.  I suggest bringing it 
up on a Variac on 60 cycles and see what happens.  The meter on my TBW 
is dual rated, 15 and 150 volt with a 30 ma 4500 Ohm multiplier.  I 
cannot see inside so what's  in there is a mystery.  Rectifiers can 
behave differently at higher frequencies, so maybe that's why it's rated 
600 to 800 cycles.

Richard, AA1P

On 8/17/19 12:38 AM, David Stinson wrote:
> Given an AC voltmeter, FS 15VAC.
> The meter face specifies 600-800 cycles.
> Is it reasonable to assume that there is less iron in this meter, vs. 
> one designed for 60 cycles?
> If so, and the meter were used at 60 cycles, would it just read 
> incorrectly,
> or would the movement overheat?
>
> TNX 73 Dave S.
>
>
>
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