Marv, Thanks for your thoughts. I'll leave it on.
Joe Gray W5JG On Sat, Aug 10, 2013 at 7:17 AM, Marv @ Home <[email protected]>wrote: > If its likely still in cal after being in storage for ? years, it likely > doesn't matter. > > In general, its best never to turn off high accuracy devices once they are > in a stable state. Aging of references is more reliable [ i.e., reduced > uncertainty] when the device is kept under power. Its a bigger issue with > 7.5 digit DMM and more. > > The EDC calibrators were made to be portable, however in the specs the > shortest term accuracy rating, ~ 1 hr of 5ppm suggests to me the unit > performs best if left powered on, if used as a reference. If may not hold > at 5ppm to a year, but it likely may be better than its 30ppm or so, worse > case. With the unit on, the quiescent operating temp of the device plus > stable lab temperatures eliminates thermal shock as one factor to > destabilize your reference's setting. > > > > At 01:27 AM 8/9/2013, Joseph Gray wrote: > >> Since the VS330 is designed to be a portable voltage standard, is it >> better >> to leave it on all the time or not? The manuals for other models don't >> say, >> but they do talk about the short power up time to achieve rated accuracy. >> So far, I have left it on. >> >> > ______________________________**_________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/volt-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts> > and follow the instructions there. > > _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
