(71B) HP 3421A DATA AQUISTION/CONTROL UNIT calibration

[Erwin]

(01-05-2017 09:09 PM)Dave Frederickson Wrote:  Hi Erwin,

Be aware that the manual temperature calibration procedure uses the internal voltmeter of the 3421A. For the temperature calibration to be accurate, the DC volts needs to calibrated first.

Edit: The temperature calibration procedure makes resistance measurements which is part of the voltmeter calibration, so resistance needs to be calibrated also, after DC volts.

Dave

Hi Dave, yes I know this - but this is the more complicated part, cause it needs a multi-scale voltage reference (to check all the DC ranges), a 6 (5) digit multimeter. Also AC calibration should be done - with different frequencies. High precision resistor test and this should be done before temperature calibration.

Then each calibration data is set in the calibration RAM.

There exist a tape for the HP85 I think it should be a BASIC program. But I could not get hands on one of this - could be easy to transfer the program to the HP71B and perform most of the tests. Maybe some have a source for this?

regards
Erwin