Chris, While the hp-3456 is a nice meter, I own one, it is not a replacement for a 731. The hp-3456 is called a transfer standard for only a very limited period of time (i.e., 24 hours or less). Whereas the 731 will hold its position (value) far longer (i.e., many months if not longer).
Bill....WB6BNQ Christopher Brown wrote: > On 8/19/12 2:40 AM, WB6BNQ wrote: > > Chris, > > > > Otherwise, if you are just looking for a working voltage standard then go > > for a > > 731B and have it calibrated by a responsible credited LAB. You can > > possibly save > > calibration costs if you specify that you are only concerned with the 10 > > volt > > output. The other output taps are only good if no current is drawn from > > them by > > using a proper null detector, specifically the Fluke 845. The 10 volt > > output has > > a low output impedance providing the ability to handle some small amount of > > loading, such as the nominal 10 Meg Ohm input on good DMM's with very minor > > error > > due to the loading. > > > > Bill....WB6BNQ > > On that front, please check my understanding. > > As I understand it, the 3456A is itself rated as a transfer standard > with a nominal input impedance in the .1, 1 and 10 VDC ranges of 10Gohm > and with due care (controlled environment, proper test leads, everything > clean and free of potentially conductive residue degrading isolation, > etc...) suitable for direct connection to a standard such as a 730A or > 731B for calibration of said standard. Also usable (in a pinch and only > below 11VDC) in place of a NULL detector. > > Am I off kilter here? > > Thanks, > Chris > WL7CLA > > _______________________________________________ > 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. _______________________________________________ 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.
