Hi All; I am sure you thought of this, but perhaps you could isolate the issue by testing your 1K with the 3458A manually in the 10K range? Or 10K in the 100K range. Cheers;
Tom Knox SR Test and Measurement Engineer Phoenix Research 4870 Meredith Way Apt 102 Boulder, Co 80303 Formerly of: 357 Fox Lane Superior Co 80027 303-554-0307 [email protected] "Peace is not the absence of violence, but the presence of Justice" Both MLK and Albert Einstein ________________________________ From: [email protected] <[email protected]> Sent: Friday, July 22, 2022 11:22 AM To: [email protected] <[email protected]> Subject: [volt-nuts] Re: HP3458 - OHMF and DELAY vs APER and NPLC Well, meanwhile I think your 3458A might have a bug in its 10k range, if 1k and 100 were measured stable in their corresponding ranges.\ Then the HW, e.g. the current source of the 3458A might be affected. How does you 3458A measure the 1k in its 10k range, btw.? I also read through the whole Service Note 12-B, which describes a lot of Firmware bugs between your 4.6 and the latest, 8 or 9. I found one which is related to OCOMP and Delay > 0.85sec, or so, and another one which deals with slow implicit reading of the buffer, or so, where the 3458A delivers only 1 valid reading. I could not match those directly with your problem, but anyhow there might be another hidden error which might explain. At RWTH Aachen in 1989, I used one of the first 3458As, also measuring 10k and 100k reference resistors with OCOMP. \ I never used the DELAY, as I was not aware of these polarization problems yet, so I did not encounter a behavior as yours… and usually I find every failure on new instruments. Like I did then: That was the calibration constant issue of the PERIOD function, which was resolved very late with Rev. 8. Frank _______________________________________________ volt-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there. _______________________________________________ volt-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
