Brand new Keysight 1204G glitches??  - Page 1
Forum section: electronics / testgear

author: bestel
author_rank: Contributor
timestamp: April 23, 2021, 02:52:22 pm
content: I've bought a Keysight 1204G.Channel 1 and 2 are doing strange things below 250 MSa/S, with random glitches of only one point :The glitch cannot be triggeredProblem disappear when Acquisition is set to average or High-res (normal for a one point glitch btw)Activation of CH3 + CH4 can make the problem disappear on the CH2, but not on CH1None of the bandpass filter, or HF rejection worksGlitches appears only on CH1 if CH2 is also on, but on CH2 if CH1 is offMaybe I'm just missing something but I'm thinking of a hardware fault.(I've updated the firmware).I've put some screenshot:- Glitches on CH2- No Glitches if I turn on CH3 + CH4- Zoom of one glitch (there is always one glitch at a time)I've also noticed that it seems there is no glitch in segmented memory mode.

author: bestel
author_rank: Contributor
timestamp: April 23, 2021, 04:32:42 pm
content: This is the weirdest thing I ever sawMaybe it's the ADC (but it's a strange distribution over the time base), or maybe it's a memory corruption.I think it's a memory corruption because it will explain why the glitches are not triggerable.But it does not explain why these glitches occurs only on CH1 and CH2, and only below 250MSa/s.I'm going to perform a firmware upgrade one more time, and maybe a firmware downgrade if it's still not ok.

author: bestel
author_rank: Contributor
timestamp: April 23, 2021, 05:12:51 pm
content: Firmware update did not change anything, and I can't find the 2.10 previous version.The glitches occurrences changes from rare (0.05%) to more often (25%) regarding of the position of the reference.For example, ref at -3 div = 0.05% of failures, at -2.5 div = 25%.Does anyone have any idea of what's going on?(As part as : sent it back for warranty)

author: bestel
author_rank: Contributor
timestamp: April 23, 2021, 08:01:05 pm
content: Mhhhhhh I've put a DC signal, and I can trigger glitches by moving the references and/or the dc offset.It seems to be a memory problem inside the ASIC :- It does appear on segmented memory, but only once- When at very low sample rate, it happen one time every two acquisition- Only affect CH1 et CH2, but never at the same time... But I can't figure out why it does not happen every time at the same place for every tension values.It's under warranty so I guess there will be no problem and I won't even think about repairing myself, but it's a real hard problem and I kind like that.Well, the thing the more valuable for the planet (and Keysight btw) should be "Keysight sending me only the ASIC part", as it's a tiny board inside it, but I think it will never happen

author: tv84
author_rank: Super Contributor
timestamp: April 23, 2021, 08:10:24 pm
content: v2.10here.

author: bestel
author_rank: Contributor
timestamp: April 23, 2021, 08:27:00 pm
content: Quote from: tv84 on April 23, 2021, 08:10:24 pmThanks!

author: bestel
author_rank: Contributor
timestamp: April 24, 2021, 08:58:19 am
content: Nope, it seems to be hardware...The only thing I do not explain, it's why this problem appear and disappear regarding of the voltage and/or position.

author: bestel
author_rank: Contributor
timestamp: May 11, 2021, 07:34:08 pm
content: Just to let you know, Keysight support is good, but rather SLOWI contacted my reseller on April 24.I was contacted by KeysightCare on April 28.I received the "ok we will send you another one" on May 10.But then I am still waiting for them...Is this normal? Have you ever been confronted with KeysightCare?Maybe I'm out of luck... twice

author: Neganur
author_rank: Unknown
timestamp: May 11, 2021, 07:46:59 pm
content: Did you initiate the communication with Keysight or was there a 3rd party in between? (You mentioned reseller)I’ve had good experience so far, but I had the email of a local contact who was very responsive. The logistics can be a bit slow though.

author: bestel
author_rank: Contributor
timestamp: May 11, 2021, 07:56:52 pm
content: I initiated communication with a third party... I think I should not next time...

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: May 12, 2021, 05:11:50 am
content: I definitely recommend going straight to our support line for a situation like this - cuts out the middleperson. Third parties just come to us anyways. Calling the line is also a good option, but the email / webform should be equally fast.Feel free to PM me the ticket # and the name of the person you're working with and I can check in on it.