[volt-nuts] Completion of LED Mod's for the Fluke 845AB & 845AR Null Meter.

Dallas Smith dosmith at outlook.com
Sun Nov 23 22:02:17 EST 2014

How do I make my RTF attachment available to Volt-nuts? I do not trust 
cloud servers and the like.


On 11/23/2014 1:29 PM, Dallas Smith wrote:
> To All,
> 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. If anyone is interested, please 
> E-mail me at my personal address.
> dosmith at outlook.com
> Dallas
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