Author Topic: Teardown of my old analog multimeter circa 1967  (Read 1289 times)

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Offline edy

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Teardown of my old analog multimeter circa 1967
« on: January 01, 2016, 08:14:06 am »
Hi folks,

I thought I'd share a teardown of my old Kaise Electronic works SK-33 multimeter. It had been sitting around for years, given to me by my father. I never managed to really use it for anything but recently tested it out and found it wasn't working properly. Since it looked like it was ready for the recycle bin and I have a number of better multimeters, I thought I'd have a crack at it and see what was in there. Turns out one of the resistors was blown. Easy enough to figure out the value and fix but not worth bothering to fix, as I need to clear space anyways.

I was happy to see the construction was very simple and to the point. The schematics can probably be easily reverse-engineered. It is a classical old-style analog multimeter (volts ac/dc, ohm, current). It is a great example for beginners to learn how multimeters work. I see a couple diodes placed in reverse which are going to rectify the AC for AC voltage readings, a capacitor for smoothing, an ohms dial to adjust for zero, and another "pot" that is adjusted inside to calibrate. Otherwise, it is as simple as can be.

« Last Edit: January 01, 2016, 08:15:39 am by edy »
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