Re: [volt-nuts] Calibration of 34401A
The only problem could be that the current calibration is already using most of the adjustment range making the required adjustment outside the limits. On Wed, Oct 12, 2016 at 4:32 AM, Illya Tsemenkowrote: > I had fixed 34401A before and DIY calibrate using on-hand sources, with > calibrated 7.5d DMM as reference. > Whole process can be visible on video - https://www.youtube.com/watch? > v=9kukXTqhzsU if you like. > So it's not a rocket science, but does need set of stable > sources/calibrator. > > 12/10/16 17:53, Dr. David Kirkby (Kirkby Microwave Ltd) пишет: > > On 12 Oct 2016 10:31, "Poul-Henning Kamp" wrote: >> >>> >>> In message <120112818.2234439.1476263954...@mail.yahoo.com>, Bruce >>> >> Griffiths wr >> >>> ites: >>> >>> Does anybody know if a 34401A can be adjusted by a competent 3rd party >>> lab, >> >>> or are the details of how to adjust the meter not available outside of Keysight? >>> The service manual has the calibration procedure, and it is all software. >>> >>> -- >>> Poul-Henning Kamp | >>> >> Cheers. It seems that the lab is incompetent then, as none of the values >> appeared to be in a massive difference >> ___ >> volt-nuts mailing list -- volt-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/m >> ailman/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/m > ailman/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.
Re: [volt-nuts] Calibration of 34401A
I had fixed 34401A before and DIY calibrate using on-hand sources, with calibrated 7.5d DMM as reference. Whole process can be visible on video - https://www.youtube.com/watch?v=9kukXTqhzsU if you like. So it's not a rocket science, but does need set of stable sources/calibrator. 12/10/16 17:53, Dr. David Kirkby (Kirkby Microwave Ltd) пишет: On 12 Oct 2016 10:31, "Poul-Henning Kamp"wrote: In message <120112818.2234439.1476263954...@mail.yahoo.com>, Bruce Griffiths wr ites: Does anybody know if a 34401A can be adjusted by a competent 3rd party lab, or are the details of how to adjust the meter not available outside of Keysight? The service manual has the calibration procedure, and it is all software. -- Poul-Henning Kamp | Cheers. It seems that the lab is incompetent then, as none of the values appeared to be in a massive difference ___ 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] Calibration of 34401A
On 12 Oct 2016 10:31, "Poul-Henning Kamp"wrote: > > > In message <120112818.2234439.1476263954...@mail.yahoo.com>, Bruce Griffiths wr > ites: > > >Does anybody know if a 34401A can be adjusted by a competent 3rd party lab, > >or are the details of how to adjust the meter not available outside of > >Keysight? > > The service manual has the calibration procedure, and it is all software. > > -- > Poul-Henning Kamp | Cheers. It seems that the lab is incompetent then, as none of the values appeared to be in a massive difference ___ 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] Calibration of 34401A
On Wed, Oct 12, 2016 at 09:54:01AM +0100, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: > He sold a Agilent 34401A multimeter which the customer said is out of > specification and can not be adjusted. > > Quickly scanning the measurent results, the meter is not showing results > with any huge errors (say 1%), but which (if any) range it is out of > specification I don't know. Unlike the Keysight calibration certificates I > have seen, the measurement results doesn't show the upper and lower limits > for the specification of the meter, so one can not tell from a quick > glance if the meter is out of specification. One would need to study the > detailed specification. In the service guide (document 34401-90013) you will find the full list of performance verification tests with upper and lower limits. You will need a calibrator to verify them (except zero). The DC 10V range accepted error after 1 year from calibration is +- 400uV (+-190uV after 24 hours, +-250uV after 90 days), so -910uV are in effect not inside limits and the instrument needs calibration. Best regards, Andrea Baldoni ___ 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] Calibration of 34401A
In message <120112818.2234439.1476263954...@mail.yahoo.com>, Bruce Griffiths wr ites: >Does anybody know if a 34401A can be adjusted by a competent 3rd party lab, >or are the details of how to adjust the meter not available outside of >Keysight? The service manual has the calibration procedure, and it is all software. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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] Calibration of 34401A
Calibration of a 34401A is done electronically, however one needs to know the calibration security code.If unknown one needs to open the meter to enable calibration and then reassemble it and complete the calibration. The factory default calibration security code is HP034401 only 034401 need be entered from the front panel.Details are given in the service manual. Everything can be done from the front panel or over the HPIB. A ~90ppm error shouldn't be a calibration issue as the initial calibration has to cope with the manufacturing tolerance for the LM399 internal reference. For the 10V range the calibration source needs to be accurately known and within the [9, 11]Volt range.It also needs to be reversed to allow linearity calibration. Bruce On Wednesday, 12 October 2016 9:54 PM, Dr. David Kirkby (Kirkby Microwave Ltd)wrote: I have a 'friend" (actually a person who I have never met, but is a pain in the ***). He sold a Agilent 34401A multimeter which the customer said is out of specification and can not be adjusted. Quickly scanning the measurent results, the meter is not showing results with any huge errors (say 1%), but which (if any) range it is out of specification I don't know. Unlike the Keysight calibration certificates I have seen, the measurement results doesn't show the upper and lower limits for the specification of the meter, so one can not tell from a quick glance if the meter is out of specification. One would need to study the detailed specification. *IF* I understand correctly, (and the data is in Spanish which I don't speak), with an input of 9,0 V, the meter reads 9,99899 which the data indicates is an error of -91 uV/V with an uncertainty of 7..7 uV/V. The lab said the meter can not be adjusted. I don't know if they mean 1) This lab has no ability to adjust the meter. OR 2) It is too far off to adjust. Does anybody know if a 34401A can be adjusted by a competent 3rd party lab, or are the details of how to adjust the meter not available outside of Keysight? 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.
[volt-nuts] Calibration of 34401A
I have a 'friend" (actually a person who I have never met, but is a pain in the ***). He sold a Agilent 34401A multimeter which the customer said is out of specification and can not be adjusted. Quickly scanning the measurent results, the meter is not showing results with any huge errors (say 1%), but which (if any) range it is out of specification I don't know. Unlike the Keysight calibration certificates I have seen, the measurement results doesn't show the upper and lower limits for the specification of the meter, so one can not tell from a quick glance if the meter is out of specification. One would need to study the detailed specification. *IF* I understand correctly, (and the data is in Spanish which I don't speak), with an input of 9,0 V, the meter reads 9,99899 which the data indicates is an error of -91 uV/V with an uncertainty of 7.7 uV/V. The lab said the meter can not be adjusted. I don't know if they mean 1) This lab has no ability to adjust the meter. OR 2) It is too far off to adjust. Does anybody know if a 34401A can be adjusted by a competent 3rd party lab, or are the details of how to adjust the meter not available outside of Keysight? 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.