Hi all,
I have a few simple applications where I need to log 5-15 channels of data (essentially voltage, current through a sense resistor, temperature), all this at rates going from somewhat fast (a few times a second) to slow (every few seconds/minutes).
I already have bench DMMs (34461A/34401A) and script them using Matlab (for now - maybe Python/C later), so I am looking for an option to do the channel switching that can also be scripted. Without breaking the bank if possible.
I assume the common instrument-based solution would be to grab an Agilent 34970A and one of the multiplexer modules off EBay ($500 in all?). If I understand well how these work, I could either use a standard module and use the internal DMM or get just a matrix switching module, use the 34970A just for switching and use my own DMM?
Is a 34970A with the multifunction module something nice to have around anyway?
Another cheaper route is to get RS232 or USB (VCP) relay boards. EBay is full of those like the KMTronic modules (e.g.
USB 8-relay board for $58). These all seem to use a very simple serial protocol for realy control, so the scripting should be very straightforward. Any recommendation for one of these?
Any other option?
Laurent