hence the low resistance equal to a metre or so of the same guage wiring used.
EDIT - Just realised, this may belong in the multiplexing forum...
I hope you're not trying to run 1-Amp through an analog multiplexer channel.
so 5v peak to peak and only a few mA are the requirements.
It is only an issue if there is sufficient current flowing to drop a voltage across it that could interfere with your measurements.
The monitoring cell in a wideband sensor is maintained at 450mV by the pump cell, so adding an ohm or so there would offset the result into the controller - this however would be a known, and I could account for this in software. Unfortunately that's not the case with the calibration resistor.
adding an ohm or so to this resistor would throw the sensor way out of cal.
Hi all,I have a requirement to use an analog multiplexer - however, all of the high-end existing solutions seem to have on resistance values of around 0.8ohms.I need the multiplexer to have an on resistance of only a few milliohms - so, assuming my logic is correct - given one has enough MCU pins available, there's nothing to stop you putting together an array of MOSFETs to build an analog multiplexer is there?Afterall, isn't that all a multiplexer is - albiet with some added control circuitry to allow you to interface via SPI or similar? I guess the only concerns are things like ensuring you having a high enough voltage to drive the gate above the source if using NMOS?Thanks!EDIT - Just realised, this may belong in the multiplexing forum...