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 Post subject: Cal Source and Movement Checker
PostPosted: Dec Fri 18, 2020 8:41 pm 

Joined: Jun Sat 09, 2007 8:14 am
Posts: 5248
Location: Melbourne, Florida
I use this little klooge for calibration and to check meter movements. It's built up on a piece of wood with a small piece of masonite for a front panel. There are two binding posts and two pin packs. The pin jacks are convenient for a DMM when using it as a calibration voltage source. To check a movement, connect a DMM in series with the movement. Start with the pot fully counterclockwise.

A ten-turn pot makes it easier to set precisely. The 4.7 K limits the current. The LED isn't necessary but helps not leaving it on and draining the battery.

Having something like this around is a lot handier that having to set up something each time you need it.


Cal Source.pdf [157.43 KiB]
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 Post subject: Re: Cal Source and Movement Checker
PostPosted: Dec Fri 18, 2020 9:36 pm 

Joined: May Tue 30, 2006 4:46 pm
Posts: 11108
Location: Santa Rosa, CA
The next step would be to add a Bandgap Reference for really accurate voltages. ... 6657fd.pdf


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