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Michael Cyboran | 12 Oct, 2005 12:00 AM
I had an almost identical aplication about 3-4 years ago. We were measuring the resistance across hearing aid switch contacts. I don't remember all the details, but I do remember that we had verify that the contact resistance was below 30 miliohms. We also tried using relays to switch the test points. I had forseen the problem with the wire resistance and the relay contact resistance, but after further study on miliohm measurments I found that there is a 4-wire setup that eliminates the test lead resistance (and any relay contact resistance) from the measurement. When selecting the tester you must be sure that it is capable of doing the 4-wire setup. Virtually all milliohm testers have it.
Posted: 12 years 8 months ago   | Permalink

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