Calibrated DMM7510

[kj7e]

I was presented an offer I could not refuse and sent my DMM7510 to CalMachine at ENILABS for calibration (and I requested adjustment).  He had my 10v reference a few weeks back were it was adjusted to 10.0000017v.  My 34465A was calibrated by Keysight in Roseville last Dec, now everything agrees very well.  Something very satisfying about this.  Now I need more digits ... 




The Cal Cert was too big to upload, here is a Google Drive link;
https://drive.google.com/open?id=13cKhjYruHux91m3_qTZ2RLhpINJhBPT-

[hwj-d]

That's an interesting calibration protocol. Thank you for sharing.

[cellularmitosis]

Nice!   

Doe this thread also serve as a subtle teaser for that aluminum box wrapped in black foam insulation with heater resistors strapped to it? 

[kj7e]

Oh yes, that  .  Work in progress...

[CalMachine]

Thank you for sending in your DMM7510!  It's always a great feeling when calibrations and measurements, across multiple instruments, agree.   

[AG7CK]

I would like to know what the columns Minimum, Maximum and Uncertainities mean (I guess the last one should read "Uncertainties").

I would normally think that Minimum and Maximum are data, but as they are symmetrical about "Nominal" for all rows, they must be calculated values. Calculated how and based on what?

The "Uncertainty" of 10 V DC Gain is listed as 0.54 mV () Looking at the specs of 5720A I find (if I am not mistaken) some 4 ppm of value + 3 microvolt or thereabout - i.e. some 43 microvolt. How is the 0.54 mV calculated / estimated and how does it relate to the specs of the calibrator / calibration equipment?

[CalMachine]

I would like to know what the columns Minimum, Maximum and Uncertainities mean (I guess the last one should read "Uncertainties").

I would normally think that Minimum and Maximum are data, but as they are symmetrical about "Nominal" for all rows, they must be calculated values. Calculated how and based on what?

The "Uncertainty" of 10 V DC Gain is listed as 0.54 mV () Looking at the specs of 5720A I find (if I am not mistaken) some 4 ppm of value + 3 microvolt or thereabout - i.e. some 43 microvolt. How is the 0.54 mV calculated / estimated and how does it relate to the specs of the calibrator / calibration equipment?

It is a known issue(typo) on our scope of accreditation.  With that said... I cannot state a lower measurement uncertainty than what our scope states.  The actual uncertainty is significantly lower.