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 Arlec DMM 10
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 Return to top of page · Post #: 1 · Written at 10:46:21 PM on 23 February 2022.
Marcc's avatar
 Marcc
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5254

An example has landed on by bench with issues likely caused (Operator failures) for not the first time. Issues with AC Volts; anyone have any circuit info on it.

Date stamp 16 Aug 1978


Regards

Marcc
 
 Return to top of page · Post #: 2 · Written at 8:03:37 AM on 25 February 2022.
Johnny's avatar
 Johnny
 Location: Hobart, TAS
 Member since 31 July 2016
 Member #: 1959
 Postcount: 544

The only problems that I have encountered with digital meters have been the protection spark gaps.
Easily seen on the circuit board, and after some mishaps with measuring by owner have arced over as designed, but have left a minute carbon track. That then will really muck up all reading, whether voltage, resistance or whatever.
Worth checking by just removal. Double sided circuit board can make this more difficult.
JJ
 
 Return to top of page · Post #: 3 · Written at 2:21:16 PM on 25 February 2022.
Marcc's avatar
 Marcc
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5254

Fortunately this one is like the three make & break faults this week, on circuit boards (so far) Its got two separate boards. Cleaning those & visual inspection has not revealed anything there. Lead free solder, which this isn't, does have a bit of a habit of growing whiskers & shorting.

Too many tangential projects at the moment to concentrate on it. It also has IC's in it.

Marc
 
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