ZEEWEII DSO1511G not showing square at 2mhz when other people's do. - Page 1
Forum section: electronics / testgear

author: slikvik
author_rank: Contributor
timestamp: May 08, 2024, 03:15:13 pm
content: Calibrated my probe as per the manual and following along exactly to the calibration in Adrian's Digital Basement video.It looks fine a 1Khz (see attachment)Switching to 2Mhz looks like the second attachment.Adrian's Digital Basement did exactly the same and got a much better square when viewing 2Mhz from the signal generator. (3rd attachment)The review on this forum also showed a pretty good 2mhz square:https://www.eevblog.com/forum/testgear/dso1511e-review/Do I have a dud version of the device?

author: tunk
author_rank: Super Contributor
timestamp: May 08, 2024, 04:50:44 pm
content: What's your signal generator? - it could be caused by it.

author: Aldo22
author_rank: Super Contributor
timestamp: May 08, 2024, 05:24:09 pm
content: Quote from: slikvik on May 08, 2024, 03:15:13 pmIf you are using the internal signal generator, I can't see how that is connected.

author: wasedadoc
author_rank: Super Contributor
timestamp: May 08, 2024, 05:25:23 pm
content: Quote from: tunk on May 08, 2024, 04:50:44 pmThe generator is probably the one in the scope but OP should confirm that.

author: csuhi17
author_rank: Frequent Contributor
timestamp: May 08, 2024, 05:26:07 pm
content: Use it's own signal generator, it knows up to 2Mhz.Why and what is the ground of your signal generator connected to??

author: slikvik
author_rank: Contributor
timestamp: May 09, 2024, 08:58:40 am
content: Yes, I'm using the internal SG which goes to 2Mhz.The poles at the top are the positive and ground poles for the SG.This is the exact same setup, settings and test as Adrian's Digital Basement and in the eevblog Product review linked above, both showing a decent square at 2Mhz from the internal SG.I'd like to know if I can either fix it or do I need to get it replaced?

author: Aldo22
author_rank: Super Contributor
timestamp: May 09, 2024, 09:41:16 am
content: Quote from: slikvik on May 09, 2024, 08:58:40 amI would first check whether the problem is the signal generator, the probe or the oscilloscope.Do you have another signal source in this frequency range?Do you have another cable or another probe?Whether you can fix it depends on your skills.Personally, I would return it if it is new.

author: slikvik
author_rank: Contributor
timestamp: May 09, 2024, 10:16:26 am
content: I don't have anything else unfortunately. Attached is the response I got via Aliexpress.I assume the device is still workable for a novice even with the attenuation in the Mhz range?Sending it back could probably result in the replacement being the same. Shame that I've seen evidence of GOOD 2 Mhz square on the same device.

author: Aldo22
author_rank: Super Contributor
timestamp: May 09, 2024, 03:40:12 pm
content: If the signal generator is the cause, then it may be acceptable.If the scope is doing this, then it's not acceptable in my opinion.I have the similar 2-channel variant DSO2512G and it looks like this:

author: csuhi17
author_rank: Frequent Contributor
timestamp: May 09, 2024, 04:02:41 pm
content: ...

author: Aldo22
author_rank: Super Contributor
timestamp: May 09, 2024, 04:17:21 pm
content: @csuhi17Is this the internal signal generator?Why is yours above 3Vpp?All others plus the specification is at approximately 2.5V?

author: csuhi17
author_rank: Frequent Contributor
timestamp: May 09, 2024, 04:26:20 pm
content: Yes, its own generator.with alligator clip, 1x and 10x measuring probe.Seen with Rigol 3VppSigpeak says 2.8Vpp.Because I tested it with the 100 Mhz measuring probe supplied with Fnirsi in the pictures

author: slikvik
author_rank: Contributor
timestamp: May 09, 2024, 04:54:31 pm
content: Dammit...mine really doesn't look great does it?If it was the SG, I wouldn't care as I'd hardly use it, but if it's the scope I'm not happy about it!Unfortunately, I can't tell.Returning is going to be a pain and, as I showed in the screenshot of my second post, they're saying "They all look like that"

author: csuhi17
author_rank: Frequent Contributor
timestamp: May 09, 2024, 05:09:24 pm
content: wouldn't a fast edge be enough for him to make sure that the scope part is good?100ns/divfor example single trigger and touching the terminals of a battery with the probe.

author: tunk
author_rank: Super Contributor
timestamp: May 09, 2024, 05:38:06 pm
content: The specs for these small scopes tends to be a bit optimistic:2MHz is the max for the generator so it could be that.How does it look at e.g. 0.5 or 1 MHZ?

author: csuhi17
author_rank: Frequent Contributor
timestamp: May 09, 2024, 06:16:23 pm
content: Would its quality have deteriorated that much? As a Sigpeak, it was even better quality.https://youtu.be/qdz101PJ6Oo?si=MCkhs0gscd7Dra_T&t=239

author: Fungus
author_rank: Super Contributor
timestamp: May 09, 2024, 07:56:11 pm
content: Is the probe switchable?Is it set to 1x mode?

author: wasedadoc
author_rank: Super Contributor
timestamp: May 09, 2024, 08:13:36 pm
content: Quote from: Fungus on May 09, 2024, 07:56:11 pmThe OP's second photo shows the scope displaying 'x10'. If the probe was set to x1, the scope would not be showing the amplitude as a few volts.

author: slikvik
author_rank: Contributor
timestamp: May 10, 2024, 09:03:38 am
content: Just so you all know....this is the response I got from Zeeweii when trying to return. For you guys in the know, does this make sense:"Hello, recently we have made a big upgrade to the DSO1511G（The new version has increased memory depth, supports a 6-digit frequency meter and pulse counter, and FFT supports cursor measurements...）. The 1.3Mhz~3.3Mhz square wave is not flat enough and only appears in the new version."

author: Aldo22
author_rank: Super Contributor
timestamp: May 10, 2024, 11:08:22 am
content: So the problem is with the oscilloscope and not the signal generator?I'm not experienced enough to judge how bad this is for practical use, but it's certainly not an improvement.What does it look like at 1MHz?P.S. Out of curiosity, I took a look at the signal from my Zeeweii SG on the benchtop scope and it looks pretty clean.

author: slikvik
author_rank: Contributor
timestamp: May 11, 2024, 12:59:08 pm
content: Attached is at 1 Mhz.What do you think of the comments they made above? I don't understand any of those changes.

author: Aldo22
author_rank: Super Contributor
timestamp: May 11, 2024, 02:53:37 pm
content: Quote from: slikvik on May 11, 2024, 12:59:08 pm1MHz looks better.Quote from: slikvik on May 11, 2024, 12:59:08 pmI do not know. If these features are not described in the manual, ask Zeeweii for an explanation.

author: slikvik
author_rank: Contributor
timestamp: May 12, 2024, 02:05:49 pm
content: Thanks. I think I'll keep it! Not sure I need 2 MHz fixing 8bit and 16bit computers anyway.

author: jackobo
author_rank: Contributor
timestamp: March 19, 2025, 12:56:40 pm
content: Not to open a new topic, have the same Zeeweii DSo1511G. pressed some button and on the display appeared Frequency little window and it start showing weather on the moon. Please need some help how to fix it, newbee to oscilloscope please bear with me

author: Fungus
author_rank: Super Contributor
timestamp: March 19, 2025, 01:08:36 pm
content: Quote from: wasedadoc on May 09, 2024, 08:13:36 pmYes but this photo has 5V/div and is showing the same amplitude as his 500mV/div photo.Quote from: slikvik on May 08, 2024, 03:15:13 pmYour probe is set to 1x.

author: Aldo22
author_rank: Super Contributor
timestamp: March 19, 2025, 01:44:24 pm
content: Quote from: jackobo on March 19, 2025, 12:56:40 pmIn addition to 10x -> 1x, you have not selected the sine wave.With this waveform, the frequency is doubled.

author: jackobo
author_rank: Contributor
timestamp: March 19, 2025, 08:11:36 pm
content: Quote from: Aldo22 on March 19, 2025, 01:44:24 pmSo what you saying,I have to set the probe to x1 not to x10?? Also could you please point me out how to select that sine wave??

author: Aldo22
author_rank: Super Contributor
timestamp: March 19, 2025, 09:07:49 pm
content: Quote from: jackobo on March 19, 2025, 08:11:36 pmThe scope settings must match the probe settings.Please read the manual:http://www.zeeweii.com/download/zeeweii-dso1511g_manual_en.pdf

author: jackobo
author_rank: Contributor
timestamp: March 19, 2025, 09:17:29 pm
content: Thanks very much but manual is very pure, any ideas how to remove this F window please?

author: BillyO
author_rank: Super Contributor
timestamp: March 20, 2025, 12:47:33 am
content: Quote from: slikvik on May 12, 2024, 02:05:49 pmGeneral information:I do a lot of that and got a 4ch. 600MHz scope with 1GHz active probes @ < 1.5 pF capacitance. Sometimes it's not enough for (quasi) modern CMOS cpu's and memory. What computers will you be working on?Even a '70s Z80 uses 4+ MHz and the data and address busses likely use and/or respond to square waves with frequency components going as high as 50MHz. That means a stray pulse of about 40ns long might be causing issues. You will never see that on this scope.Let's not even consider a 17MHz 68000!Something like the Zeeweii DSO3D12 would be a better bet if you stuck to earlier 1MHz 6502, 6800 and CPUs like that.

author: Aldo22
author_rank: Super Contributor
timestamp: March 20, 2025, 11:05:35 am
content: Quote from: jackobo on March 19, 2025, 09:17:29 pmI don't know, as I don't own this device. It seems to be a newer feature.Maybe it works like the DSO154Pro?https://www.eevblog.com/forum/testgear/new-toy()-scope-dso154pro-1ch-claimed-40mss/msg5418215/#msg5418215

author: jackobo
author_rank: Contributor
timestamp: March 20, 2025, 02:13:20 pm
content: Quote from: Aldo22 on March 20, 2025, 11:05:35 amThanks for the link, following that thread 154Pro has a different operating buttons combination, cos it didnt work on this babe, still dont know how to remove that F window.

author: Aldo22
author_rank: Super Contributor
timestamp: March 20, 2025, 03:03:48 pm
content: Quote from: jackobo on March 20, 2025, 02:13:20 pmBut somehow you managed to switch it on.Can't you remember which buttons you pressed?If not, ask the seller.Maybe there is a factory reset?

author: BillyO
author_rank: Super Contributor
timestamp: March 20, 2025, 03:35:39 pm
content: Quote from: jackobo on March 20, 2025, 02:13:20 pmIs it in the menu in measurement - "frequency"?Or maybe under the menu in display - "F_Meter"?

author: tunk
author_rank: Super Contributor
timestamp: March 20, 2025, 03:52:26 pm
content: As a last resort, maybe open it and disconnect the battery for a few minutes.

author: jackobo
author_rank: Contributor
timestamp: March 20, 2025, 06:06:45 pm
content: Quote from: Aldo22 on March 20, 2025, 03:03:48 pm

author: jackobo
author_rank: Contributor
timestamp: March 20, 2025, 06:08:36 pm
content: Quote from: BillyO on March 20, 2025, 03:35:39 pmTheres no such menu and no such feature, alas, checked first place.

author: jackobo
author_rank: Contributor
timestamp: March 20, 2025, 06:09:59 pm
content: Quote from: tunk on March 20, 2025, 03:52:26 pmTried, kept battery disconnected for about a minute, same same nothing gone, probably written in some ROM chip.

author: BillyO
author_rank: Super Contributor
timestamp: March 20, 2025, 07:22:50 pm
content: Quote from: jackobo on March 20, 2025, 06:08:36 pmWhich menu? Both the "Measurement" and "Display" menus are clearly mentioned in the user manual and "frequency" is listed under the "Measurement" menu.When they added that feature to the DSO3D12, they put it under the "Display" menu, but it is not mentioned in the manual.

author: jackobo
author_rank: Contributor
timestamp: March 20, 2025, 07:35:03 pm
content: Quote from: BillyO on March 20, 2025, 07:22:50 pmOh that frequency, its only a tick box, when its ticked the Frequency shown at the bottom of the display(blue box) and has nothing to do with this rainbow color Frequency box in the right top corner marked on my picture with red arrow (((

author: BillyO
author_rank: Super Contributor
timestamp: March 20, 2025, 07:38:58 pm
content: Quote from: jackobo on March 20, 2025, 07:35:03 pmAnd there is nothing under the "Display" menu?Why not just ask Zeeweii how to enable and disable the frequency counter. Tell them you cannot find it in the manual.

author: jackobo
author_rank: Contributor
timestamp: March 20, 2025, 07:46:44 pm
content: Quote from: BillyO on March 20, 2025, 07:38:58 pmUnder the display menu theres only : persistence (none, 1sec or infinity);roll(on/off),and brightness bar. Emailed zeegweii two days ago but that brilliant product support crowd prefer remain the silence.

author: hfleming
author_rank: Regular Contributor
timestamp: March 20, 2025, 08:33:54 pm
content: My honest advice, if you don’t have an independent square-wave generator, build something like a 74HC14 Schmidt-triggered oscillator and test ypur scope with it. It can be anything, from your scope probe, to the scope itself, or its signal gen. You need to eliminate things one by one, until you have only one unknown.

author: Aldo22
author_rank: Super Contributor
timestamp: March 20, 2025, 08:59:43 pm
content: Please check the date of the post before answering a question from last year again.The current question is only jackobo's.

author: jackobo
author_rank: Contributor
timestamp: March 21, 2025, 11:04:12 am
content: Contacted last night Zeeweii Official Store at aliexpress. Replied immediately, much respect to that crowd.So folks for those who accidentally turned on that F_Meter, how to disable it:Go to Menu>Display> press Run/Stop button the extra tab will appear and simply set it to off. Another undocumented feature (((

author: BillyO
author_rank: Super Contributor
timestamp: March 21, 2025, 01:41:24 pm
content: Cool! I had a suspicion it was in that display menu somewhere.

author: jackobo
author_rank: Contributor
timestamp: March 21, 2025, 01:44:45 pm
content: Quote from: BillyO on March 21, 2025, 01:41:24 pmFollowing common sense it should have, but for god sake, I'd never figure out how to call up that submenu tab on the screen if they havent point me out )))

author: BillyO
author_rank: Super Contributor
timestamp: March 21, 2025, 01:49:53 pm
content: Quote from: jackobo on March 21, 2025, 01:44:45 pmYeah, on the DSO3D12 you have to press the "x1/x10" button once you are in the display menu to get to the submenu. Also not in the documentation. It was buried in the note of the latest firmware upgrade. They really need to update their manuals.

author: jackobo
author_rank: Contributor
timestamp: March 21, 2025, 03:07:15 pm
content: Quote from: BillyO on March 21, 2025, 01:49:53 pmFeels like considering the pricing of these devices, Zeeweii dont care much about it: they never replied my email to CS sent to the official website.

author: BillyO
author_rank: Super Contributor
timestamp: March 21, 2025, 10:34:33 pm
content: Quote from: jackobo on March 21, 2025, 03:07:15 pmYeah, I've only got them once or twice that way. The best way is to contact them at one of their official stores on AliExpress or other selling platform. They respond better that way.

author: jackobo
author_rank: Contributor
timestamp: April 02, 2025, 06:27:57 pm
content: Does anybody owning this toy have such incorrect reading? Mine shows 9.2v instead of 10.2v.Is that normal for these toy scopes??

author: Aldo22
author_rank: Super Contributor
timestamp: April 02, 2025, 06:59:53 pm
content: Quote from: jackobo on April 02, 2025, 06:27:57 pmAlways set the highest possible sensitivity, i.e. here 5V/div instead of 10V/div.The “mean” value is probably more accurate than the RMS value.