FeedbackLoop | #47 - Datron 1071 7.5-digit multimeter repair @feedback-loop | Uploaded 8 years ago | Updated 12 hours ago
A vintage metrology grade meter was repaired, calibrated and tested for stability. Not much was wrong with it: a couple of faulty caps, a stuck switch, and corrupt calibration data. The display is bad as well, but usable, so it can be tolerated for now. The loss of calibration is, of course, a big deal since I don't have appropriate equipment to calibrate a 7.5-digit meter, but I have done what I could given the circumstances. Then I run the meter together with HP 34401A for about 28 hours taking measurements of 10V from Fluke 341A calibrator over GPIB and plotting the data using Octave 4 with instrument-control package. The results look good: just a few ppm of drift over a wide temperature range, and the meters stayed within about 2.5 ppm from each other.
Forum: http://www.eevblog.com/forum/metrology/datron-1071-repair/
Datron 1071 Service Manual: https://drive.google.com/file/d/0B3NWgPtazb_tMUhKbkZpYXlUQTg/
Fluke 341A calibrator repair: https://youtu.be/mxz3-fGs1Lk
A vintage metrology grade meter was repaired, calibrated and tested for stability. Not much was wrong with it: a couple of faulty caps, a stuck switch, and corrupt calibration data. The display is bad as well, but usable, so it can be tolerated for now. The loss of calibration is, of course, a big deal since I don't have appropriate equipment to calibrate a 7.5-digit meter, but I have done what I could given the circumstances. Then I run the meter together with HP 34401A for about 28 hours taking measurements of 10V from Fluke 341A calibrator over GPIB and plotting the data using Octave 4 with instrument-control package. The results look good: just a few ppm of drift over a wide temperature range, and the meters stayed within about 2.5 ppm from each other.
Forum: http://www.eevblog.com/forum/metrology/datron-1071-repair/
Datron 1071 Service Manual: https://drive.google.com/file/d/0B3NWgPtazb_tMUhKbkZpYXlUQTg/
Fluke 341A calibrator repair: https://youtu.be/mxz3-fGs1Lk
