Does anyone have the schematic for the Fluke 845 chopper modification as
stated in front of manual to be released approximately Dec 1993?
Manual statement:
'The new circuit now employs optically-isolated Bilateral Analog FETs,
and is fabricated on an additional circuit board.'
Frank, from Volt-Nuts 21 Mar 2010, suggested that: The 335A_D manual
contains the coil chopper for the calibrator circuitry, (page 119/120)
and the opto chopper version for the included Null volt meter, same
circuitry as of the 845A/B. Compare this with the 335_D manual,(page
169) where you can find the MOS FET version for the calibrator amplifier.
Has anyone tried this circuit for the Fluke 845ab?
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