Agilent DSO8064A self test failed in vertical test group - Page 1
Forum section: electronics / repair

author: schenkmi72
author_rank: Contributor
timestamp: June 20, 2019, 05:25:54 am
content: Dear friends,yesterday I picked up a Agilent DSO8064 after a longer train ride. The seller says "self test passed" but sadly when I did the test it did not pass.The the failure of the self testTest: Vertical Test Group -- FAILEDDid anyone of you have a hint what's going wrong or is their a more detailed error log somewhere on this unit ?Many thanks and best regardsMichael

author: Jwalling
author_rank: Unknown
timestamp: June 20, 2019, 06:40:13 am
content: Look in c:\scope\selftestThe text log will be there. Open in Wordpad so it formats correctly.

author: schenkmi72
author_rank: Contributor
timestamp: June 21, 2019, 08:08:51 am
content: I've attached the self test results getting from c:\scope\selftestScopeTestGood.txt is the same scope from 2012 which has passed the self testScopeTestBad.txt is the actual run which fails.

author: schenkmi72
author_rank: Contributor
timestamp: June 21, 2019, 08:17:52 am
content: When I do a diff of the two files I don't see a big difference nor can I sport the test which cause to faildiff -Naur ScopeTestGood.txt ScopeTestBad.txt > ScopeTestDiff.txt

author: schenkmi72
author_rank: Contributor
timestamp: June 21, 2019, 08:21:00 am
content: Yesterday I have calibrate the scope but the self test still fails

author: Jwalling
author_rank: Unknown
timestamp: June 21, 2019, 09:03:35 am
content: Oddly enough, I've seen that exact failure before. It turned out that the flex cable between the ACQ board and the probe board was cocked a bit.

author: dzseki
author_rank: Frequent Contributor
timestamp: June 21, 2019, 09:04:40 am
content: Assuming a honest seller, it indeed could be a mere contact problem with either hybrid or connection.

author: analogRF
author_rank: Super Contributor
timestamp: June 21, 2019, 11:27:04 am
content: Quote from: schenkmi72 on June 21, 2019, 08:08:51 amdoes the scope show signals correctly on all or some of the channels ?are there more detailed individual tests that can be run in that drop down menu?I am not familiar with 8064/8164 but I have repaired several 54845/46 and I suppose these must be similar in a lot of ways. In those infiniums you can run more detailed tests than just "vertical group".My suggestion would be (1) check all the connectors and coming out of the acquisition board(2) post a picture of the acquisition board so we can get a better idea of how it is configured (3) if it is anything similar to 548xx series, careful cleaning of the ASICs will most probably fix it. That is well documented in eevblog and youtube. but I don't know how the acquisition board in 8064 is designed.

author: schenkmi72
author_rank: Contributor
timestamp: June 24, 2019, 05:20:19 am
content: Hi all,thanks for the fruitfully inputs and hints. In the mean time I've managed to reset the admin account, update to the latest and greatest 5.71 software and with help of some other threads here I have now a lot of options too

author: schenkmi72
author_rank: Contributor
timestamp: June 24, 2019, 05:31:11 am
content: Dear friends,now a little bit of DSO8064A acquisition board porn. I've a lot more picture which I can upload if someone is interesting in.CheersMichael

author: schenkmi72
author_rank: Contributor
timestamp: June 24, 2019, 05:43:58 am
content: Hi,even it looks not totally nice but with some hot glue it's quite easy to install a SATA SSD without taking apart half of the 8064A to replace the harddrive.CheersMichael

author: schenkmi72
author_rank: Contributor
timestamp: June 27, 2019, 04:19:53 pm
content: Quote from: analogRF on June 21, 2019, 11:27:04 amMany thanks for the fruitful input. Beyond the up-hacking fun I've checked all cables from and to the acquisition board carefully. I found a not well seated flex and reseat it. In this kind of scope the ASIC's are soldered and can't be reseated. But after the reseat of the flex cable the scope pass it's vertical test group. So I'm very happy. Many thanks for all the good hints.CheersMichael