[volt-nuts] Fluke 845AB Null Detector
holrum at hotmail.com
Fri Mar 19 21:57:39 UTC 2010
Yes, my 845AB has a pretty sensitive null control. I can get it to zero without too much fiddling. There is some filter lag between tweaks and meter movement.
I checked all the electrolytic caps and replaced a couple of suspect ones.
I just rebuilt my Fluke 343A DC calibrator. It started acting funky after a 24 hour power failure. The output would cycle up and down about 30% over a 1 minute period. Turns out about 6 small electrolytic caps went. All is now well. The thing is spookily stable. 1 uV to 1000 volts outs. Not too bad for 50 bucks.
Wish it did AC. I have a 5200A ac calibrator but it only goes to 100V. The 5205 power amp weighs about 100 pounds and uses vacuum tubes for the output.
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