Here’s another project I’ve put together recently, largely stemming from an oversupply of signal relays.
For those that haven’t seen them before, most of the major test equipment manufacturers have scanning meters, or external scanners that use one of their meters. The idea is pretty simple, relays just run through a programmable sequence of connecting the meter to inputs, then record the meter’s output for each input.
So this one is a 10 channel, USB connected scanning card which you control from a PC. The idea being that you can take any old meter that you can read the output to a PC, then control the card to take measurements.
Very useful when you have a whole bunch of test points and one expensive meter. Also great when you’re trying to make relative measurement (such as input to output efficiency), where absolute accuracy is less important that ratios.
I’ll post all the source to Github once I’ve verified there are no mistakes at the hardware level.