Author Topic: 5700A OHM troubleshoot  (Read 1927 times)

0 Members and 1 Guest are viewing this topic.

Offline dl1640

  • Regular Contributor
  • *
  • Posts: 160
  • Country: cn
Re: 5700A OHM troubleshoot
« Reply #25 on: March 20, 2018, 08:11:40 pm »
Today, CalCheck again, results are similar as yesterday's.
Tomorrow, maybe have a few runs of SelfDiag, to check if relays fail. :popcorn:
 

Offline dacman

  • Frequent Contributor
  • **
  • Posts: 344
  • Country: us
Re: 5700A OHM troubleshoot
« Reply #26 on: March 22, 2018, 12:24:01 pm »
The Resistance Reference on the Artifact Cal Report is a ratio, not a resistance value (it has no units).  The 1.0 Ohm and 1.9 Ohm are the two values that are not tested during a Cal Check (their shifts are always zero on a Cal Check report, even on a 5730A) and Fluke chose to list these with the internal references.
 

Offline dl1640

  • Regular Contributor
  • *
  • Posts: 160
  • Country: cn
Re: 5700A OHM troubleshoot
« Reply #27 on: March 22, 2018, 06:54:08 pm »
Hello dacman,

It seems you're very familiar with these calibrators, thank you for your explanation.
I'm still  making some brutal codes to check the relays and the ohm readings, both 4w and 2w.
 

Offline dl1640

  • Regular Contributor
  • *
  • Posts: 160
  • Country: cn
Re: 5700A OHM troubleshoot
« Reply #28 on: March 27, 2018, 09:50:29 pm »
First run of 4wire measurement with DIY leads.Measurement setup:5700A set points are 10k 100k 1M 10M (OHM), respectively. External sense ON. For each set point it is measured 101 times, for each time the output is ON and OFF, this checks the relays. The instrument status is read to confirm the output settled status etc.3458A is reset once before measurement then the trigger is hold, the aper is set to 0.5s, after 5700A output settled there is about 2s wait time then a single trigger is taken and the data is read back to spreadsheet, after 101 data are complete the stdev and avg are calculated, the relative drift for 10k 100k and 1M is less than 1ppm while it is about 2ppm for 10M. ( The absolute accuracy is quite good even without ocomp or delay treatment on the DMM)So it is not the end, I'll check with different cabling and I think it'll be different results.If leave behind the issues arise from humidity, dust, relay contact etc.probably the cabling is important, I don't know what cabling Fluke use when they claim the issue.Attached is my DIY cabling under this measurement.
 

Offline dacman

  • Frequent Contributor
  • **
  • Posts: 344
  • Country: us
Re: 5700A OHM troubleshoot
« Reply #29 on: March 28, 2018, 09:55:26 am »
I once had a 5720A that gave an error during a Cal run with the 10 Vdc source connected.  I decided to exercise the (bad) relays by repeating the (artifact) calibration up to the point that it gave the error.  Once it cleared up it never gave the same error again, and that issue occurred several years ago.

My familiarity with these units is that I've maintained several units and archived both the Cal Check and Artifact reports.  Cal Check and Artifact reports are always at 99% confidence, even if the confidence is set to 95%.  (Confidence can be set to 95% on Series II units, but not on original units.)
 

Online TiN

  • Super Contributor
  • ***
  • Posts: 3539
  • Country: tw
  • xDevs.com
    • xDevs.com
Re: 5700A OHM troubleshoot
« Reply #30 on: March 28, 2018, 11:35:33 am »
Quote
Cal Check and Artifact reports are always at 99% confidence
This is not what I see here with 5720 FW Ver.1.4+ :) Reports have specs calc according to 95% or 99% setting.  :-//
xDevs.com YouTube | Have test gear documentation to share? Upload here! No size limits, firmware dumps and teardown photos welcome.
 

Offline dl1640

  • Regular Contributor
  • *
  • Posts: 160
  • Country: cn
Re: 5700A OHM troubleshoot
« Reply #31 on: March 28, 2018, 09:23:06 pm »
Mine is reported as 99% confidence too.
 

Offline dacman

  • Frequent Contributor
  • **
  • Posts: 344
  • Country: us
Re: 5700A OHM troubleshoot
« Reply #32 on: March 29, 2018, 01:07:31 pm »
TiN,
Do you have an example Artifact report showing 95% Spec values in ppm?
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf