Agilent 34970A error 744 - Work around to avoid recalibration? - Page 1
Forum section: electronics / testgear

author: AndersJ
author_rank: Frequent Contributor
timestamp: May 01, 2020, 08:53:10 am
content: When Benchlink Data Logger 3 attempts to download the instrument configurationthe error message ”744: Error occurred in application” is displayed, and logging will not start.I believe this means calibration has been lost.I don’t need full performance, or precision down to the last decimal,just a reasonably working instrument without error messages.Is there a way to reset the calibration to default settings,to get the instrument up and running again without a full calibration?

author: Jwalling
author_rank: Unknown
timestamp: May 02, 2020, 02:59:40 pm
content: You can do a zero offset calibration using a 34901A. That will re-calculate the checksum.

author: AndersJ
author_rank: Frequent Contributor
timestamp: May 02, 2020, 03:27:41 pm
content: Is there no quick and easy way to tell it to use a reasonabledefault calibration to get it up and running again, with less precision?As it it is now,it won’t download configurations when the start button is clicked.I can’t verify if my setup is correct.Measurement accuracy is of less concern.

author: Jwalling
author_rank: Unknown
timestamp: May 03, 2020, 09:58:28 am
content: Quote from: AndersJ on May 02, 2020, 03:27:41 pmThat's what a zero offset calibration will do for you, without disturbing any valid calibration constants that you still have. Very easy to do. All you need is a 34901A with a wire short. Procedure in the service manual is titled "To Perform a Zero Adjustment"

author: AndersJ
author_rank: Frequent Contributor
timestamp: May 03, 2020, 10:50:41 am
content: Can you confirm the meaning of the error message I getwhen”Downloading Instrument Configuration...”?The message is: ”ASRL1:INSTR : 744: Error occurred in application”.Is this a calibration issue?What is a ”application”, in this context?

author: Jwalling
author_rank: Unknown
timestamp: May 03, 2020, 11:48:22 am
content: Quote from: AndersJ on May 03, 2020, 10:50:41 amWhile powering on the instrument, press and hold the VIEW button until it beeps, then release the button. Do all tests pass?

author: AndersJ
author_rank: Frequent Contributor
timestamp: May 03, 2020, 12:07:10 pm
content: Two errors are detected, 744 in both cases.1: ERR 7442: ERR 744

author: Jwalling
author_rank: Unknown
timestamp: May 03, 2020, 12:26:38 pm
content: Quote from: AndersJ on May 03, 2020, 12:07:10 pmWell, there you go. A zero adjustment will fix those errors, however, 2 wire resistance measurements may be affected.

author: AndersJ
author_rank: Frequent Contributor
timestamp: May 03, 2020, 02:05:15 pm
content: Do I need to do a zero offset calibration for every channel, or only channels I intend to use?Where is error 744 described?

author: Jwalling
author_rank: Unknown
timestamp: May 03, 2020, 02:15:43 pm
content: Quote from: AndersJ on May 03, 2020, 02:05:15 pm1. Just need to do it once on CH 209, then it's done.2. Should be in one of the service manuals.744 Cal data lost: RES corrections

author: AndersJ
author_rank: Frequent Contributor
timestamp: May 03, 2020, 04:26:18 pm
content: I do not have channel 209.I tried 109, thinking you may have meant 109 since that channel was shorted.It worked, and I am up and running again.Next question: Why did this happen?The battery is at 2.97V when AC is removed, and should be OK.

author: Jwalling
author_rank: Unknown
timestamp: May 03, 2020, 05:04:00 pm
content: Quote from: AndersJ on May 03, 2020, 04:26:18 pmThe calibration should be done with the 34901A in slot 2 according to the manual.This is a common problem with these, probably because the FRAM gets written to on every relay click on the DMM board.Nothing to do with the battery...