[volt-nuts] Newer Fluke 845ab manual with chopper mod?
dosmith at outlook.com
Sat May 3 12:18:13 EDT 2014
Does anyone have the schematic for the Fluke 845 chopper modification as
stated in front of manual to be released approximately Dec 1993?
'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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