I recently had a helper wind several coils for traffic detectors, essentially the same as the ones that trigger traffic lights. The coil is supposed to be 3 turns, 48" diameter, and placed into the roadway so that the three turns, (length) of the coil is a total of 3/8" high. The problem is that one of the detectors doesn't work, and I suspect that either my helper lost count or got lazy, and the the coil doesn't have the correct Number of turns on it.
I don't have an accurate enough resistance meter to determine if the total length of the wire is correct, as the resistance of the wire is very low.
1)Is there a SIMPLE, portable, circuit that I can build to check that the correct number of turns was wound, after the roadway is sealed? (I'd rather not pack an ocilliscope and signal generator out there and set up)
Thanks, Rich
I don't have an accurate enough resistance meter to determine if the total length of the wire is correct, as the resistance of the wire is very low.
1)Is there a SIMPLE, portable, circuit that I can build to check that the correct number of turns was wound, after the roadway is sealed? (I'd rather not pack an ocilliscope and signal generator out there and set up)
Thanks, Rich