I bought a Fluke 8842a DMM from ebay 1 month ago based on Dave's enthusiastic review (
https://www.eevblog.com/2017/08/03/eevblog-1012-ebay-fluke-8842a/)
The display is very bright and the DMM pass all self tests ok.
I measure 2 reference sources, (2.5000V and 5.0000V) and I see a display jitter about plus-minus 3-4 units for the last digit.
I check the references with a fresh calibrated Keysight 34465A DMM and they are spot on and very quiet.
I log 2000 samples of the 5.0000V reference to a file using IEEE488 interface and the mean value of the measurements is 5.0000 with a minimum of 4.9995 and a maximum of 5.0005V.
Using fluke 8842A Instruction Manual I try to resolve the display jitter.
I measure the -7V ref (TP701) and +7V ref (TP702) of the voltage reference of 8842A and the values are correct (+7.0000V and -7.000V and quiet)
I don't know how to proceed from here.
Any advice will be apreciated