Re: [volt-nuts] Bls: Bls: How accurate is a fluke after 9 years
it is this resistor, in its z-foil version. they can be ordered from vpg distributors also in small qty (some may have a min. order value), lead time is usually pretty high. Gesendet: Montag, 18. Mai 2015 um 02:39 Uhr Von: Anton Moehammad via volt-nuts volt-nuts@febo.com An: Discussion of precise voltage measurement volt-nuts@febo.com Betreff: [volt-nuts] Bls: Bls: How accurate is a fluke after 9 years Hi All, in the Vishay web I found a better in spec resistor than vha512, could somebody give a comment ? http://www.vishaypg.com/docs/63120/hzseries.pdfThey also offer non standard value, anybody has experience in Vishay non standard value ? Thank You ___ 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] Bls: Bls: How accurate is a fluke after 9 years
The 5700A5720A verification test lists a maximum deviation from nominal on the resistance ranges. Is there any information on how well Fluke's hybrid resistors are maintaining their specs over the lifetime of the calibrator? Anyone have access to long term records of the resistance values? Todd On Mon, May 18, 2015 at 2:13 AM, acb...@gmx.de wrote: it is this resistor, in its z-foil version. they can be ordered from vpg distributors also in small qty (some may have a min. order value), lead time is usually pretty high. Gesendet: Montag, 18. Mai 2015 um 02:39 Uhr Von: Anton Moehammad via volt-nuts volt-nuts@febo.com An: Discussion of precise voltage measurement volt-nuts@febo.com Betreff: [volt-nuts] Bls: Bls: How accurate is a fluke after 9 years Hi All, in the Vishay web I found a better in spec resistor than vha512, could somebody give a comment ? http://www.vishaypg.com/docs/63120/hzseries.pdfThey also offer non standard value, anybody has experience in Vishay non standard value ? Thank You ___ 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] HP 735A DC Transfer Standard
Hi Roy, I hate to tell you but the hp-735 does not compare to the Fluke 731. The hp-735 had a drift that was constant. This information came from a friend of mine that was responsible for the US Navy's Primary DC voltage standard at their Primary Lab in San Diego, CA in the 1970's. The actual drift rate I do not recall anymore, but it was significantly higher than the any drift in the Fluke. BillWB6BNQ R.Phillips wrote: -Original Message- From: gilb...@nickgilbert.org Sent: Sunday, May 17, 2015 4:13 AM To: volt-nuts@febo.com Subject: [volt-nuts] HP 735A DC Transfer Standard Recently acquired a HP 735A DC Transfer Standard. Replaced some caps, but its otherwise clean and has since been powered. Read a post recently about a 735A oven failure that included a teardown that revealed why HP states the oven/ref assembly a non-serviceable part. The failure in this person's device was the heater, specifically the thermistor. Anyone on this board have a 735A in use? Do you keep it powered 24/7 or as-needed? Any failures/repairs/mods? Best Nick __ Hi Nick I also very recently acquired a HP 735A DC Transfer Standard. Mine has a Power Transformer with the centre tap 'open circuit' - this I guess was the result of a failure in the pre-regulator circuit which in turn caused a resistor to 'burn-out'. I have 'hooked-up' external positive and negative rails and the unit works, including the oven ! So, I will rebuild this to the later and I think final specification - which eliminates the 'pre-regulator' circuit. Otherwise the unit is in excellent condition, in keeping with HP of that period, and probably superior to the Fluke 731B. I gather that these are quite rare items now. Let us know how you get on with the 'project' Regards Roy 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. ___ 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] HP 735A DC Transfer Standard
-Original Message- From: gilb...@nickgilbert.org Sent: Sunday, May 17, 2015 4:13 AM To: volt-nuts@febo.com Subject: [volt-nuts] HP 735A DC Transfer Standard Recently acquired a HP 735A DC Transfer Standard. Replaced some caps, but its otherwise clean and has since been powered. Read a post recently about a 735A oven failure that included a teardown that revealed why HP states the oven/ref assembly a non-serviceable part. The failure in this person's device was the heater, specifically the thermistor. Anyone on this board have a 735A in use? Do you keep it powered 24/7 or as-needed? Any failures/repairs/mods? Best Nick __ Hi Nick I also very recently acquired a HP 735A DC Transfer Standard. Mine has a Power Transformer with the centre tap 'open circuit' - this I guess was the result of a failure in the pre-regulator circuit which in turn caused a resistor to 'burn-out'. I have 'hooked-up' external positive and negative rails and the unit works, including the oven ! So, I will rebuild this to the later and I think final specification - which eliminates the 'pre-regulator' circuit. Otherwise the unit is in excellent condition, in keeping with HP of that period, and probably superior to the Fluke 731B. I gather that these are quite rare items now. Let us know how you get on with the 'project' Regards Roy 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.
