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| Keithley 179A resistance measurement is slowly degrading, is there a way to fix? |
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| LinuxHata:
Thanks everyone! So this is fixable, that's good. I'll take one of the weekends to complete my upgrade kit for this DMM (it adds modern LED display and continuity buzzer to ohm mode) and will check these components then as well :) |
| LinuxHata:
Speaking of transformer insulation. I do have up to 2000V insulation tester, which can test gigaohm ranges. Will it be safe to use it to test the insulation from AC winding of transformer to GND pin of the DMM ? |
| Kleinstein:
--- Quote from: LinuxHata on May 08, 2023, 08:18:16 am ---Speaking of transformer insulation. I do have up to 2000V insulation tester, which can test gigaohm ranges. Will it be safe to use it to test the insulation from AC winding of transformer to GND pin of the DMM ? --- End quote --- This should be OK, at least if not on the Ohm mode. In the ohm mode there is additional protection circuitry between the circuit ground and the LO input, that may complicate things. |
| AVGresponding:
--- Quote from: LinuxHata on May 08, 2023, 08:18:16 am ---Speaking of transformer insulation. I do have up to 2000V insulation tester, which can test gigaohm ranges. Will it be safe to use it to test the insulation from AC winding of transformer to GND pin of the DMM ? --- End quote --- It's also usually a good idea to connect line and neutral together for this kind of test, as well. If there's a line input filter, this will need to be disconnected; the capacitors won't be rated for that voltage. |
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