Stan Wilder wrote: If you make long runs of wire from the back to the front of your van forinstruments that read mili-amp signals be sure that you don't twist the > wire more than a turn or two during the run, higher current passing > through adjacent wires can cause magnetic signals to be generated. > Reference: Twisted TWX wires for signal light vehicle sensors are > required to have a twist every six or eight inches to generate a magnetic > pulse. Huh?? Twisted pairs of wire are used to *reduce* production and reception of interfering signals in data transmission. I don't think that the design of vehicle traffic sensors is directly applicable here. When running two wires to a remote sensor I would twist them together perhaps once per foot. Of course a coaxial arrangement with an outer conductive shield provides better signal protection for very low current signals like from an O2 sensor. Larry A. |
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