Rigol DHO804 Bode Plot - Page 1
Forum section: electronics / testgear

author: Mechatrommer
author_rank: Super Contributor
timestamp: December 14, 2023, 01:57:01 pm
content: my prototype now can be used with DHO804 for bode plot (barely) so i tried to redo test by TimFox here...https://www.eevblog.com/forum/testgear/rigol-dho914s-bode-plotR = 100 ohm, C = 33nF, so cutoff freq = 48kHz... (1 / (2.pi.R.C) )i can confirm the same bugs and wobbly effect in old FW1.14.1) the bode plot procedure is finding optimum vertical scale for each frequency, but its inefficient imho. its just brute force set to minimum vertical scale and increase the scale until signal fits the monitor for each point. this results one click for each channel for every point to be plotted (2 clicks per point), i think this can wear out front end relay quickly. the more efficient way is only do brute force search during the beginning, and increase or decrease vertical scale from there on the next point, if signal too small, decrease scale, if signal too big, increase scale, cant you think of that rigol? how many brains you have over there?2) i tried to set acquisition to average to reduce noise and hopefully wobbly effect of the plot on low level signal, but unfortunately the dso changes to normal acquisition during bode plotting, sigh. where is another brain?3) suggestion: another trick to get better bode plot. is to convert input signal to FFT, find largest magnitude bin, that is our fundemantel, get it phase as well. then convert the output signal (CH2) to FFT, and find the same bin element, find its magnitude and phase, substract both values and you got a point on bode plot. i think this will be much cleaner.so i guess if bode plot is too important, controlling DHO804 from PC to adjust time and vertical scale appropriately, command the AFG to give incremental frequency at desired voltage level, download the data to PC,and do our own procedure/algorithm for bode plot is much preferable... only the good thing about internal AFG/AWG is we only need one cable connected to PC rather than two in case of external AFG unit... fwiw...

author: Randy222
author_rank: Frequent Contributor
timestamp: December 14, 2023, 02:28:01 pm
content: If 100,000 owners of a DHO email Rigol saying "it would be good if you could write the code needed to run a functional BODE plot, that would be good since your competotors like Siglent already do it", maybe Rigol will do it.Maybe you get a reply like, "yes, our new DHO Pro series will have BODE".

author: Mechatrommer
author_rank: Super Contributor
timestamp: December 14, 2023, 02:36:23 pm
content: they already did, except we need to email them telling "your bode plot function is not efficient enough yet, let us help you with suggestions"

author: Randy222
author_rank: Frequent Contributor
timestamp: December 14, 2023, 02:40:19 pm
content: BODE is in DHO800 firmware 01.00, 01.01, and 01.02 ?I was not aware.

author: Mechatrommer
author_rank: Super Contributor
timestamp: December 14, 2023, 02:50:28 pm
content: Quote from: Randy222 on December 14, 2023, 02:40:19 pmi guess yes, but there is channels offset issue after calibration, so nobody use that with 924S vendor.bin... further investigation/hack will be needed on that.

author: Fungus
author_rank: Super Contributor
timestamp: December 14, 2023, 04:02:23 pm
content: Quote from: Randy222 on December 14, 2023, 02:40:19 pmYou have to enable the AWG functions for it to appear (ie. change model to DHO900S).

author: vanyas
author_rank: Contributor
timestamp: December 15, 2023, 09:23:47 am
content: But no offset with DHO914/DHO914S vendor.binWaiting for your AWG module...

author: Mechatrommer
author_rank: Super Contributor
timestamp: December 15, 2023, 10:30:09 am
content: Quote from: vanyas on December 15, 2023, 09:23:47 amdo you know the link for DHO914S vendor.bin? i'm not aware of it... what i saw from people is DHO914 vendor.bin (no AFG option)

author: Pinkus
author_rank: Frequent Contributor
timestamp: December 15, 2023, 10:58:56 am
content: As far as I understand this:https://www.eevblog.com/forum/testgear/hacking-the-rigol-dho800900-scope/msg5223060/#msg5223060you can create your own by using the software from the link."DHO924S" as the scope model should do it (I did not try this yet).

author: vanyas
author_rank: Contributor
timestamp: December 15, 2023, 11:08:52 am
content: Quote from: Mechatrommer on December 15, 2023, 10:30:09 amYou can use this tool to change model in your vendor.binhttps://github.com/zelea2/rigol_vendor_binsaving your S/N and MAC

author: Randy222
author_rank: Frequent Contributor
timestamp: December 15, 2023, 03:04:13 pm
content: Quote from: vanyas on December 15, 2023, 11:08:52 amSecureAge and BkavPro always seem to red flag these github files.

author: Pinkus
author_rank: Frequent Contributor
timestamp: December 15, 2023, 04:01:18 pm
content: Bkav Pro is known to produce a lot of false positives.The products of the other 70 virus vendors (checked athttps://www.virustotal.com/) did not find any problem, thus I am confident, that SecureAge is wrong too.

author: Fungus
author_rank: Super Contributor
timestamp: December 15, 2023, 05:15:49 pm
content: Here's a DHO914 vendor.bin

author: Mechatrommer
author_rank: Super Contributor
timestamp: December 15, 2023, 05:58:57 pm
content: Quote from: Fungus on December 15, 2023, 05:15:49 pmcannot do bode plot

author: Randy222
author_rank: Frequent Contributor
timestamp: December 15, 2023, 06:08:56 pm
content: Quote from: Pinkus on December 15, 2023, 04:01:18 pmOr perhaps the other 70 have literally missed it.VT makes no claims to the accuracy of the tools they list.

author: vanyas
author_rank: Contributor
timestamp: December 15, 2023, 07:08:52 pm
content: DHO914S vendor.bin

author: Mechatrommer
author_rank: Super Contributor
timestamp: March 07, 2024, 08:46:29 pm
content: My Second Bode Plot on DHO804 (AFG module rev 2) with latest FW 1.2.2bode plot function is improved on latest FW as if they listened to my point #1 in OPlast time i tested on much older FW 1.14 btw will do AFG module rev 3 to improve further noise level, if not by a lot...i hope that will be the last revision before i publish itcheers.attached are my prototype replica board, just in case if someone want to have a sneak peekfwiw...

author: BobbyGun
author_rank: Newbie
timestamp: May 27, 2024, 10:51:11 pm
content: Any news?After 2 mons waiting no changes?I have a question - in the beginning, you couldn't get an X-ray of the original board?I think things would go much faster.

author: Mechatrommer
author_rank: Super Contributor
timestamp: May 28, 2024, 09:48:37 am
content: Quote from: BobbyGun on May 27, 2024, 10:51:11 pmi too wished someone with the original module can do the xray and complete BOM but, i cant wait for such hope. btw still stuck with other things i cant get back to progress yet... cheers.

author: Lathe26
author_rank: Contributor
timestamp: July 12, 2024, 03:47:36 pm
content: Just so folks don't get too excited for the Bode plot feature, it also has some weird display bugs where the graph is rendered wrong. At least this was the case with the v01.02.00.02 firmware.https://www.eevblog.com/forum/testgear/rigol-dho914s-bode-plot/msg5327351/#msg5327351

author: gcfix
author_rank: Newbie
timestamp: April 11, 2025, 02:19:55 pm
content: Hi Mechatrommer,I see that you were working on an AWG board. Have you finished it and are you selling copies?Best regards