Hi, first post! Yeah, I ran into this issue a while back. Fortunately for most applications 10mV resolution is fine (eg measuring charge state on Li-ion cells) but I did find that old meters do seem to experience random drift failures of precision resistors and more so trimpots. Would it be a good idea for someone to do a "732 FAQ" with likely faults that would cause a particular matrix of symptoms?
Also how do you deal with failures where a precision component has "gone bad" ? Surely all the calibrations are suspect which is why any sensible engineer always has two references at a bare minimum and sets up a master/slave or main/backup then maintains a calibration table of each? so if a drift is seen then the "bad" unit can be dealt with sternly. I looked into making a 10.0000Vref a while back and had some success with active feedback via thermal pad: it almost worked but in the end it was cheaper and simpler to buy one ready made (cough REF02 /cough) Also relevant, since originally buying my RS IDM65 you can now get I2C precision CT references which can replace the troublesome parts with something that does not drift, ever! -Andre ________________________________________ From: volt-nuts <volt-nuts-boun...@febo.com> on behalf of Alan Ambrose <alan.ambr...@anagram.net> Sent: 30 August 2017 17:33 To: volt-nuts@febo.com Subject: [volt-nuts] 732A drift >>> My 732A<x-apple-data-detectors://28> e.g. has a drift of only about 0.2ppm >>> pa over a couple of year Hope you don't mind me jumping on this thread and asking a basic question: is there any kind of procedure for the 'enthusiast' (say with single 3458A/single 732 and not say 4x732) to measure the drift of a particular 732. Alan _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.