I am not familiar with the HP 740B. It looks like it needs a special connector for the front panel to get an output or input. If true, I would score that as a negative.
I have a 335A that had some problems when I got it. Turned out it was just some dead electrolytic caps that were identifiable by sight, bulging, etc. I replaced them and all was well. The manual is readily available. It uses binding posts for connection. It recently developed a new problem, the 'Overload' light is continuously illuminated though the output is still there and accurate. I suspect a transistor issue but have not had a chance to explore yet. You will need a 5 1/2 digit DMM, minimum, to be able to see the 1 uV change. Measuring that is a bit of a challenge in that it is not stable, voltage source, meter, temp changes, etc., all playing a role. However, I seem to recall you have a Solartron 7081 so you can watch the 1 uV all the way up to 10 V. I have been looking for an affordable 335D but, so far, have not found one. However, I found a Fluke 5440B/AF. It just arrived recently, seems to work on initial, superficial, check out, but I have not had a chance to incorporate it into my rack yet or investigate it's stability. However, at the current price, why not get all three, 335A, 335D, and 740B? Joe -----Original Message----- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: Friday, December 14, 2012 8:16 PM To: 'Discussion of precise voltage measurement' Subject: [volt-nuts] Fluke 335A versus HP 740B Both DC Voltage standards up to 1000V or so, and also null differential meters. Also both being sold by the same vendor as the other stuff Do the assembled mavens have a view as to which is preferable? Thanks Dave _______________________________________________ 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.