[volt-nuts] Completion of LED Mod's for the Fluke 845AB & 845AR Null Meter.
dosmith at outlook.com
Mon Nov 24 15:00:33 EST 2014
Anyone who received the RTF file for the Fluke meter mod, the latest
revision can be found at ko44's FTB server.
This will be the final source for the modifications.
> The final modification of the Fluke null meters with LED's is
> completed. The results is impressive, keeping the basic original
> circuit of the meters. My rev 8 AR version has a double diode in the
> output stage which seems to remove the zeroing hysteresis around a
> zero reading was also made to my 845AB. Implementing two 1.2v
> reference diodes in the zeroing circuit greatly improved the zero
> drift for the zeroing control. There were also changes to the feedback
> response by changing two capacitors.
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