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"Lynn Coffelt" bravely wrote to "All" (07 Dec 05 00:24:56)
--- on the heady topic of " Ground resistance tester" LC From: "Lynn Coffelt" LC Xref: core-easynews rec.radio.amateur.homebrew:89630 [,,,] LC The LC instrument the civil engineers used to make the measurements was hand LC cranked, something like the "Megger" used for insulation break-down LC testing. I cannot say whether it was a regular "megger" or a LC specialized instrument. Anyhow, we mechanics tried to do our own LC testing with an ordinary VOM and found the task quite vexing. One LC problem was that stray currents in the ground drove the ohmmeter crazy, LC and as if that wasn't enough, the ohmmeter probes current caused an LC electrolytic (?) reaction, sort of like trying to measure the LC resistance of a battery using a standard VOM. Now I'm going to LC back up and read some of the references provided by previous LC responders. Old Chief Lynn, W7LTQ (I still like Furuno, Roy!) Speaking of electrolytic reactions.... I would try a tool from the tv service industry called an ESR meter. It measures the internal resistance of electrolytic capacitors by using an ac signal of moderate frequency around 100K Hz. They can typically measure from 0.09 ohms to 199 ohms. A*s*i*m*o*v .... Useless Invention: Flashbulb tester. |
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