have to fix some Voltohmyst VTVMs

[DavGoodlin]

Originally Posted by Kamakiri

Since we're talking VTVMs, I picked up this sexy lookin Jackson 709 Tele-Volter at a hamfest last weekend for $20. I was instantly attracted to it because of the big angled meter.

I've decided recently that I really have to get myself used to using analog meters as much as I can, and (thanks to Dave) have an RCA Senior VoltOhmyst to match my Master VoltOhmyst I got last month.

Anyway, back to the Jackson. I recapped it (which was a bit tricky with the layout inside), and adjusted it. It reads the ohm scale dead on, but wouldn't read DC. I read the manual, and it said to measure DC, switch the probe to DCV. Unfortunately the test leads were cut on the very end, so I just soldered on leads and alligator clips.

What sort of probe would the meter use? Something I can make up?

On almost all VTVM's I have seen, the DC switch on the test probe adds a 1 meg resistor in series. This is supposed to isolate any RF from capacitance of the shielded test lead.