[AMPS] SB-220 Meter Replacement

[km1h@juno.com]

On Mon, 11 Jan 1999 18:55:15 -0500 "Walter Fairclough"
<wfairclo@netcom.ca> writes:
>
>I've been told that the plate current meter on the SB-220 can be 
>replaced
>with a meter from a Heath HM-102 wattmeter.  I've noticed that the 
>meter
>movement on the one in the HM-102 is approx. 1/2" in diameter while 
>the one
>from the SB-220 is larger at about 1 to 1-1/4" in diameter.

There are actually 3 HM-102 meters in use. The original had the large
diameter movement and was USA made. The small one is electrically
identical and is from Japan.  The third is a completely different unit
with a solid white case and different scale mounting altho it appears to
have the Jap movement....not sure about that tho.



>
>I think the resistance in the SB-220 meter is approx. 1400 ohms and 
>its FSD
>is 2ua. I don't know what the specs are on the one in the HM-102.


SB200/201, SB220/221/HL2200 and early HM-102 all used the same 1400Ohm
200ua meter, only the scale changed.

73  Carl  KM1H


>
>Can anyone tell me if they are interchangeable or not? I'd hate to 
>blow a
>good meter.
>
>Thanks
>
>Walter-VE3EN
>
>
>
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>

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