Hello,
..
CAL?72 over two days was 0.25ppm max between three ACAL ALL.
..
The processor board with the Dallas NV RAMS seems to be a bit younger It still Rev A with 09-9217 USA Made and has two Dallas NVRAMs date code 0640C below the EPROMS but has still one Dallas NVRam date code 9814D.
So the 9814D seems to be the most scary one which is the closest to the rear side.
The calibration seals on the handle screw from Agilent and Fluke were broken so there could be some change after 2012.
How can I upload pictures I have some from the unit?
Christian
Hello Christian,
the oldest nvRAM, date code from 1998, labeled DS1220, is the calibration RAM, and really is the crucial one.
You should at once read its content into a file on your PC, and later program all these calibration constants in a replacement chip.
The other two nvRAMs DS1230 are not critical, but should be replaced also, as they are already 11 years old.
Your A/D hybrid seems to be healthy.
Frank