[volt-nuts] Fluke 845AB 1993 Modification Schematic

Dallas Smith dosmith at outlook.com
Thu Sep 25 13:14:16 EDT 2014

On 9/25/2014 12:01 PM, starbook at uplink.net wrote:

I not sure this was ever used for production, no known schematic. I'm 
going to use the LTC1150 for my other null meter 845ar. It would be a 
better choice then the fet chopper you are referring to. I'll use the 
LTC1150 for the first stage with the over all feedback and stage two op 
amp to control the feedback for the switch 101b which controls the gain 
from 300 to 9000. will scale this gain between the two op amps. Look at 
the May and August threads. Randy Evans is currently designing a new 
chopper for his HP419.


> Need the schematic of the Fluke 845AB 1993 modification.
> Thanks,
> John
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