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Fast 4-wire resistance scan module for 2701

Posted: January 22nd, 2016, 1:43 pm
by CH2009
Hello

We have a dmm (2701 model) and we want realize a fast scan of 9 channels (all 4-wires resistance measurements). We have a 7706 module but we want to know if a faster module is available? In the current case, with the 7706 module, for one 4-wires resistance channel the duration is around 80ms (1NPLC, autozero on, lsync off, range 1kOhm). We want keep the accuracy we have with this configuration and just improve the scan speed.

Thanks in advance

Re: Fast 4-wire resistance scan module for 2701

Posted: January 25th, 2016, 5:08 am
by brian.d.smith
Using a 2701 and 7708, I get just about exactly the same time per sample. I did this exercise for a customer last year.

The relays opening, closing and debouncing are what accounts for the time per sample and will not be any faster in any of the reed relay cards.