[Amps] SB220 Meter blown

[Jim]

Its W7RY whoever you are....



Thanks
73
Jim W7RY

On 5/15/2020 10:43 PM, Adrian wrote:
> Well the shunt diode both ways protection method certainly saved my sb-220
> meter in the past,
> So I just don't believe you W7FRY.  Good diodes should be checked after
> install, after any 'event' to check
> they have not opened, and therefore replaced before further use.
>
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Jim
> Sent: Saturday, 16 May 2020 1:20 PM
> To: amps at contesting.com
> Subject: Re: [Amps] SB220 Meter blown
>
> WRONG.
>
> .6 or .7 or slightly more during an "event" volts is still enough to blow up
> the meter.
>
>
> Thanks
> 73
> Jim W7RY
>
> On 5/15/2020 4:08 PM, Adrian wrote:
>> from ; http://www.somis.org/sb-220ci.html
>>
>> "6. Meter damage can be avoided by connecting two, ordinary = or >1A,
>> any PIV, silicon rectifiers across the terminals on each meter. The
>> two diode arrows should point in opposite directions."
>>
>>
>> On 16/5/20 1:10 am, Artek Manuals wrote:
>>> I am resurrecting a SB220 that had an apparent classic Grid/plate
>>> short event. One of casualties appears to be the right hand meter
>>> movement. This is the one for Grid Current and HV. I am pretty far
>>> into it and the meter movement measures open , the internal shunt
>>> resistor is blackened ( and open?)
>>>
>>> Anyone got a surplus movement from a parted out unit? Nothing found
>>> on evil-bay at the moment
>>>
>>> Dave NR1DX
>>>
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