- Reaction score
- 7
Hi
Running a quick test on a lighting circuit today, was doing R1 + R2 on downstair lights. Everything seemed OK, but upon trying to prove polarity by using switches obviously upon switching off the circuit goes open but when tried switching on again and testing again I got a wildly different figure. I initially thought I had a bad contact as figure was jumping about a bit but did after some messing get it to settle at a reasonable figure but upon trying the switch (off test O/C, switch on and test again) got another miles out figure. Tried this a few times and the readings went between approx 0.5 ohms and about 3.5ohms and everything inbetween.
Each time once I had a reading I disconnected probes then reconnected them and tested again to prove it wasn't a bad contact that was causing the problem but this gave results within 0.05ohm of each other. It was just upon using the switch it seemed to badly throw the result.
This was in fact present on 2 switches on the whole downstairs lighting circuit (the second case not as bad but still giving results different enough for concern).
My hunch is the switch is buggered? Is this a view others share? The light fitting was really awkward so had to test a number of times to confirm that it wasnt just a case of my probes not having good contact but it did seem to just be the switch causing this issue?
Anyone else experienced this?
Running a quick test on a lighting circuit today, was doing R1 + R2 on downstair lights. Everything seemed OK, but upon trying to prove polarity by using switches obviously upon switching off the circuit goes open but when tried switching on again and testing again I got a wildly different figure. I initially thought I had a bad contact as figure was jumping about a bit but did after some messing get it to settle at a reasonable figure but upon trying the switch (off test O/C, switch on and test again) got another miles out figure. Tried this a few times and the readings went between approx 0.5 ohms and about 3.5ohms and everything inbetween.
Each time once I had a reading I disconnected probes then reconnected them and tested again to prove it wasn't a bad contact that was causing the problem but this gave results within 0.05ohm of each other. It was just upon using the switch it seemed to badly throw the result.
This was in fact present on 2 switches on the whole downstairs lighting circuit (the second case not as bad but still giving results different enough for concern).
My hunch is the switch is buggered? Is this a view others share? The light fitting was really awkward so had to test a number of times to confirm that it wasnt just a case of my probes not having good contact but it did seem to just be the switch causing this issue?
Anyone else experienced this?
