Hantek DSO2d10 - wave generator not working anymore - Page 1
Forum section: electronics / repair

author: Ron Werner
author_rank: Contributor
timestamp: June 10, 2022, 11:58:44 pm
content: I am new to this forum, so I hope I chose the right place to ask my question.I am mostly a novice, meaning that electronics is a fun hobby, and I am not so strong on the theory. I am fascinated by everything to do with HF, VLF, metal detectors, geiger counters, alpha particle detectors, charge detectors, just to name the most important.I recently bought a Hantek DSO2D10 in order to be able to get my failed projects working. And actually I have had a lot of positive results already.While testing my Hantek I went through all the functions and everything seemed to be OK.Today I received a simple frequency counter and I wanted to test it using the wave generator of the Hantek, but to my great surprise I couldn't get it working. I tried all the buttons, went through all the menu's, but nothing helped. Googling didn't help me either.I was wondering if somebody here has experienced something similar or the same with Hantek and what can be done about it. I would be grateful for any suggestion, maybe I am making some foolish mistake? I don't know...Ron WernerNorway

author: bob91343
author_rank: Super Contributor
timestamp: June 11, 2022, 08:41:38 pm
content: First check the power supply.

author: tunk
author_rank: Super Contributor
timestamp: June 11, 2022, 08:57:07 pm
content: Are you sure it's the DSO that's the problem? - it could be the counter.Maybe you could connect a (BNC) cable between the generator output and one of the channels?

author: Ron Werner
author_rank: Contributor
timestamp: June 12, 2022, 01:07:04 am
content: Thanks for replying.No, the power supply is OK, the rest of the scope is fully functional and the indication light of the wave generator works too.The counter is OK too. Tested it my crystal tester and it worked perfectly.No, the problem really is the wave generator or some detail about its functioning I am missing.I saw some tutorials on Youtube, copied what they did to activate the generator, but I see no wave on my screen whatsoever. Even the baseline is missing, there just is no signal visible, even when turning off both channel 1 & 2.Going back to the default setup doesn't help either.And I know from the expierence of others what a hassle it can be to get Hantek to fix the problem.I really hope someone comes up with a true AHA solution...

author: bob91343
author_rank: Super Contributor
timestamp: June 12, 2022, 03:40:00 am
content: No baseline? That means one of four things.1. No sweep.2. Trace off screen due to large offset voltage.3. Intensity set too low.3. Very large signal causing spot to be deflected off screen most of the time.

author: Ron Werner
author_rank: Contributor
timestamp: June 13, 2022, 11:32:36 pm
content: This is what I see on my display.For the sake of clarity I disabled both channels, and activated the wave generator. This is the first picture.The display shows nothing, then I press "auto set" hoping that a wave form pops up.Instead I get the result as shown on the second picture: channel 1 gets activated.

author: pcprogrammer
author_rank: Super Contributor
timestamp: June 14, 2022, 11:19:15 am
content: With what are you checking the output of the signal generator?With both input channels disabled and the signal generator enabled there will not be a signal on the screen. Just the menu, and that will close itself after a short time of not touching the buttons.To see if it works you can use a BNC to BNC cable and connect the AWG output to a channel input, or stick the tip of a probe into the AWG output.Make sure the output level is set high enough and check if it works.

author: DavidAlfa
author_rank: Super Contributor
timestamp: June 14, 2022, 05:54:15 pm
content: First re-apply the last update, even if you're already on it. That will default all settings. Just in case, it's the most reasonable step before disassemblying anything.If you didn't update anything yet, what are you waiting for? Check the FAQ. Update FW and SW.Have you connected it to any low impedance circuit that could have send power into it? I doubt it can survive that!

author: Ron Werner
author_rank: Contributor
timestamp: June 16, 2022, 08:54:45 pm
content: Many thanks for the helpful replies.I connected the wave generator output to channel 1 and indeed I finally got to see the wave on the display.However, I might be wrong, but this is not the way I recall it from the first time I tested the scope. I cannot remember connected the output of the wave generator to any input.And I find it strange this counter didn't register any input signal. The counter functions perfect with for instance my crystal tester.Most of all, I cannot remember that the signal from the generator was as unstable as can be seen on the short video.

author: pcprogrammer
author_rank: Super Contributor
timestamp: June 17, 2022, 04:20:27 am
content: Quote from: Ron Werner on June 16, 2022, 08:54:45 pmMaybe the signal level was set to low for the counter to be able to register it. When I looked at it to make the pictures it was set at 90mV which might be a default from factory because I had not played with it before.Quote from: Ron Werner on June 16, 2022, 08:54:45 pmLooked at the video and it seems that the scope is switching between time base settings which causes the jumps, but that does not account for the amplitude change. It might be a rotary dial being flaky .

author: DavidAlfa
author_rank: Super Contributor
timestamp: June 17, 2022, 01:50:52 pm
content: The video looks really strange!That's a known issue with very low amplitudes, it doesn't sync well, I noticed it works better when rising the trigger level over the max signal amplitude.Seems like it's syncing with something else, ex. noise not being shown in the screen.Ensure to calibrate the scope!

author: genilson lima
author_rank: Newbie
timestamp: October 16, 2023, 10:14:40 pm
content: I have the same problem about the generator not working, it doesn't generate a waveform, it has a dc level signal of -4.2Vdc, I've tried everything, hopefully someone finds out something about it. a question: does the function generator have any IC dedicated to the function generator?

author: pcprogrammer
author_rank: Super Contributor
timestamp: October 17, 2023, 06:07:29 am
content: Yes the function generator has a couple of ic's just for it. Early C models did not have them installed. See theschematicfor more info.The top level of the repository (see link in my signature) holds all sorts of information about the scope.