Re: [volt-nuts] (New to me) 3458A Trivia
Per my conversation with Gary Biermann, the 4 ppm and the 2 ppm units are the same as the 8 ppm units except they perform better. Purely a selection of best performers and nothing to do with a special circuit. I don't know about Fluke. Joe -Original Message- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf Of John Phillips Sent: Tuesday, October 30, 2012 11:07 AM To: Discussion of precise voltage measurement Subject: Re: [volt-nuts] (New to me) 3458A Trivia I think the main thing they do is age and screen. On Tue, Oct 30, 2012 at 6:48 AM, Bill Gold wrote: > Speaking of the 03458-66529 reference board added to the HP 3458A by > Fluke (before Fluke offered the 8508A), has anyone ever seen a > schematic of that board or how Fluke could rate that reference at 2 > ppm? One person on this forum theorized that by lowering the > operating temperature of the LTZ1000A to around 70 degrees C, which is > what the LTC device specification note recommends, this might have > what was done to achieve the better drift specification. It was noted > that HP was running the LTZ1000A at around 105 degrees C which might > accelerate the aging rate. I lowered my references to around 70 C and > they have seemed to be a little more stable when checked against the > Fluke 732A DC Reference Standard. But I never started a project to > follow up on this theory. Just another project to play with when I "get a round toit" > Bill > ___ > 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. > -- John Phillips ___ 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.
Re: [volt-nuts] (New to me) 3458A Trivia
Speaking of the 03458-66529 reference board added to the HP 3458A by Fluke (before Fluke offered the 8508A), has anyone ever seen a schematic of that board or how Fluke could rate that reference at 2 ppm? One person on this forum theorized that by lowering the operating temperature of the LTZ1000A to around 70 degrees C, which is what the LTC device specification note recommends, this might have what was done to achieve the better drift specification. It was noted that HP was running the LTZ1000A at around 105 degrees C which might accelerate the aging rate. I lowered my references to around 70 C and they have seemed to be a little more stable when checked against the Fluke 732A DC Reference Standard. But I never started a project to follow up on this theory. Just another project to play with when I "get a round toit" Bill ___ 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] (New to me) 3458A Trivia
I just added a 'new' (manufacture date late 1998) 3458A to the collection that had Option 001 and 002 noted on the rear panel. When it arrived, all seemed well, passed self test, seemed accurate but with OPT? and ENTER, it returned OPT 1,0 which implies OPT 001 is installed. However, I thought that it did not have OPT 002 installed. I called Agilent, spoke with Gary Biermann, and learned that there never was a way to tell from the front panel if OPT 002 is installed or not. The only way to tell is to open it up and look at the part number on the DC Reference Board. I did this and discovered that it, indeed, had part number 03458-66519 installed, the 4 ppm reference. 03458-66509 is the 8 ppm reference and 03458-66529 is the 'ultra high stability' 2 ppm reference. Thought I would share this 'pearl' but I suspect most know this already. Was news to me though. Joe ___ 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.
