Post Reply 
(71B) HP 3421A DATA AQUISTION/CONTROL UNIT calibration
01-05-2017, 09:09 PM (This post was last modified: 01-05-2017 09:56 PM by Dave Frederickson.)
Post: #4
RE: (71B) HP 3421A DATA AQUISTION/CONTROL UNIT calibration
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.

Edit #2: Before diving into what is now becoming a much bigger task, are your batteries good? The CAL Data battery can be replaced with a Panasonic BR-2/3AE5SPN, Digi-Key P226-ND. The 6V 3.2Ah SLA battery can be replaced with a Powersonic PS-632. There's a nice procedure for replacing the CAL battery here: http://www.eevblog.com/forum/repair/owon...t=prev#new
Note: This is exactly the same battery as the one in the 3468 DMM.

Dave
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
RE: (71B) HP 3421A DATA AQUISTION/CONTROL UNIT calibration - Dave Frederickson - 01-05-2017 09:09 PM



User(s) browsing this thread: 1 Guest(s)