I am forwarding this from the TekScopes@yahoogroups.com email list: http://www.conradhoffman.com/mini_metro_lab.html

Chopper amps can make good DIY transfer references. The Krohn Hite or EDC MV106 [ and its derivatives such as the MV105, 106C and many of their dial-up analog voltage references] use a very similar design, to great effect. Its spec sheet is fairly conservative and rates is accuracy typically 10x worse due to its wider operating conditions, but in a temp controlled room my actual 30 day stability is 4ppm at 10V, and <=2 ppm in 24 hrs. The 106 can resolve down to 100nV, the limits of my HP3456a. Given the costs of a ppm reference, its well worth building if you can't get a used EDC reasonably. ________________________________________ From: volt-nuts-bounces@febo.com [volt-nuts-bounces@febo.com] on behalf of David [davidwhess@gmail.com] Sent: Monday, February 27, 2012 2:03 PM To: volt-nuts@febo.com Subject: [volt-nuts] The Mini Metrology Lab from Electronics Now, March 1996 I am forwarding this from the TekScopes@yahoogroups.com email list: http://www.conradhoffman.com/mini_metro_lab.html _______________________________________________ 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.