RetiredHAL
New Member
Hi, my favourite meter has developed a fault. it will read DC on the DC AND on the AC scale (correctly). Eg a 9v battery will read 9v DC and 9v AC! Model is Triplett 310c. Does any one have a cct diagram or knows what the problem is? A quick check does not reveal any burnt resistors, splat marks on the slider tracks or other obvious failures.
Moderator if this post should be under datasheets would you please move it?
Cheers RH
Edit; more info, one component worries me. it is a small brown capsule that has V64 written on it (nothing else) it connects to the meter movement.
I'm pretty sure it is a mov (Google says 1 Mohm at .10V and 4ohm at 1V--- schauer V64--- datasheet not available). Using Analogue meter ohms scale it reads 120 ohm. Using Fluke 23 ohms scale it measures 700Kohm. Is that normal? and is it a likely suspect. Also I unsoldered the AC bridge diodes and they all look, read OK, I will replace these in any case with diodes from another meter. With the slider out all other resistors measure roughly what is printed on them.
Cheers Again RH
Edit again, I have found a schematic at the triplett website.
Moderator if this post should be under datasheets would you please move it?
Cheers RH
Edit; more info, one component worries me. it is a small brown capsule that has V64 written on it (nothing else) it connects to the meter movement.
I'm pretty sure it is a mov (Google says 1 Mohm at .10V and 4ohm at 1V--- schauer V64--- datasheet not available). Using Analogue meter ohms scale it reads 120 ohm. Using Fluke 23 ohms scale it measures 700Kohm. Is that normal? and is it a likely suspect. Also I unsoldered the AC bridge diodes and they all look, read OK, I will replace these in any case with diodes from another meter. With the slider out all other resistors measure roughly what is printed on them.
Cheers Again RH
Edit again, I have found a schematic at the triplett website.
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