[Amps] Checking SB-220 meter continuity

[donroden at hiwaay.net]

Put a "D" cell ( 1.5volts ) in series with a 2 ohm resistor and a  
digital ammeter ( Fluke or whatever set to measure current ) between  
the minus HV and Chassis.

Compare readings.

Don W4DNR



Quoting Jim <jimw7ry at gmail.com>:

> Its most likely mechanical.
>
> Corrosion builds up between the washers on the studs of meter. Both  
> on the inside and outside. I've also hears of instances where it can  
> be the meter movement itslef with a bad connection on the band or  
> adjusting mechinisem.
>
> Seems to me the meter movement is about 150 ohms.
>
>
> Thanks
> 73
> Jim W7RY
>
> On 5/26/2020 10:02 AM, Steve London wrote:
>> The plate current meter in my SB-220 has gone flaky. R1, R2, R3 and  
>> the zener diode are fine. Sometimes, I can tap on the meter and it  
>> will come to life. Using something like a Fluke 87, what should the  
>> continuity across the meter measure ? Just want to determine if  
>> this is a mechanical problem or electrical problem.
>>
>> 73,
>> Steve, N2IC
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