There's a lot of HV fuses over on the "evil empire".
73, Dick, W1KSZ
On Thu, Oct 10, 2013 at 8:11 AM, Paul Christensen <w9ac@arrl.net> wrote:
> This also applies to the plate meter or any low-resistance current meter,
>> which nearly all of them are.
>>
>> 73, Bill W6WRT
>>
>
> Good info Bill -- and it's not a difficult exercise, beyond simple algebra
> to solve for the right series resistance value once the meter resistance is
> known or computed.
>
> To validate a DC meter's internal resistance, I still use the simple
> method described in a ca. 1950s Allied's Electronics Data Handbook. It
> always brings me back to my high school days when as students, we were
> tasked to find a DC meter's resistance. First thought for the unknowing:
> just grab a <gasp!> Simpson 260 set on the Rx1 scale! The instructor
> stopped us in time. Anyway, that same math will also prove why sensitive
> moving coils are subject to failure without the limiting resistor.
>
> Paul, W9AC
>
>
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