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| Continuity Tester |
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| Gyro:
As far as I can find, the AN9250A has a continuity threshold of 30R +/- 10R. Lower than many but still well a bit short of the 1R threshold that the OP is requesting. I think it It comes down to low cost easy home construction or paying out more to build something with a display like the Shorty (not sure off-hand if this is available as a kit / ready built). Mine is a variation on the theme of the EPE article wheatstone bridge design which achieves fast audible indication, 1R / 1M threshold and decent input protection (that can be uprated as required). Unlike the Leo design, it doesn't turn on semiconductor junctions (<300mV open circuit), I find this desirable but others may differ. |
| Fungus:
--- Quote from: Gyro on July 24, 2023, 06:21:26 pm ---As far as I can find, the AN9250A has a continuity threshold of 30R +/- 10R. Lower than many but still well a bit short of the 1R threshold that the OP is requesting. --- End quote --- I measured mine at 49 Ohms. I don't know anything that will go as low as 1 Ohm. 1 Ohm is the leads and contacts. |
| Gyro:
Yes, you do need to tweak the threshold slightly to accomodate lead resistance etc. It is doable though - my tester will trigger probing a 1R resistor but not a 1R2. Not bad for 2 wire. |
| KungFuJosh:
--- Quote from: Gyro on July 24, 2023, 08:32:52 pm ---Yes, you do need to tweak the threshold slightly to accomodate lead resistance etc. It is doable though - my tester will trigger probing a 1R resistor but not a 1R2. Not bad for 2 wire. --- End quote --- What's the point of the 1MΩ range? Is that for checking bad insulation or something? |
| Gyro:
Exactly that, contamination on PCBs etc. |
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