Zeeweii DSO1C81 - Page 1
Forum section: electronics / testgear

author: Aldo22
author_rank: Super Contributor
timestamp: July 05, 2024, 09:58:50 am
content: A new cheap 1-Ch handheld scope from Zeeweii: DSO1C81Not much is known yet.Probably 80MHz 300MSa/SIt seems to use an AGM AG32VFPrice seems around 200 Yuan.Probably some kind of upgrade of the quite popular DSO154Pro with more bandwidth and a proper case for not much more money...

author: piggy.dai
author_rank: Newbie
timestamp: July 06, 2024, 12:07:17 pm
content: Here is a picture of the disassembly from a Chinese netizen:https://www.mydigit.cn/thread-461249-1-1.html

author: Dave_g8
author_rank: Regular Contributor
timestamp: July 06, 2024, 01:24:33 pm
content: Hi,Seems a nice little device and if the cost is comparable with the DSO154Pro it will probably do very well given the well thought out user interface.Zeeweii obviously think that there is still a market for the low-end single channel oscilloscopes.Notes- Looks like a 2-channel ADC, probably interleaved to increase performance for the single channel implementation.- The AG32 is a higher pin count than the DSO154Pro and although the base specifications are the same there is more IO pins available.- Looks like it has a solid state relay for AC/DC input selection.- Will USB image download be supported?- Does it require a protected 18650 battery and will that be included?

author: Aldo22
author_rank: Super Contributor
timestamp: July 06, 2024, 02:33:29 pm
content: Quote from: Dave_g8 on July 06, 2024, 01:24:33 pmI guess (pure speculation) that it will cost around $35.It has to fit between DSO154Pro and DSO1511G in price.No idea how much sense that makes.

author: piggy.dai
author_rank: Newbie
timestamp: July 07, 2024, 06:44:09 am
content: With 1500mA 18650 battery, USB download images don't seem to be supported, and it is not indicated in the introduction

author: Aldo22
author_rank: Super Contributor
timestamp: July 20, 2024, 08:18:58 am
content: Now it's on Aliexpress:https://www.aliexpress.com/item/1005007393992391.htmlThe price is in the middle between DSO154Pro and DSO1511G, as I had expected.Interesting are the 60KPts storage depth, FFT frequency measuring, zoom mode and the 20MHz bandwidth limitation.

author: tunk
author_rank: Super Contributor
timestamp: August 22, 2024, 02:03:26 pm
content: The manual is now out:http://www.sigpeak.com/download/zeeweii-DSO1C81_manual_EN.pdf

author: Aldo22
author_rank: Super Contributor
timestamp: August 22, 2024, 02:34:25 pm
content: I think it is probably the best (hobby/toy) scope at this price.Whether it will be a market success, I don't know.With 2 channels maybe, but as it is it seems a bit like "too little, too late".The DSO1511G has been around for longer and doesn't cost much more.

author: tunk
author_rank: Super Contributor
timestamp: August 22, 2024, 04:49:48 pm
content: They seem relatively honest about their product specs(as opposed to e.g. Fnirsi). Too bad they don't activilypromote their products - e.g. Zoyi/Zotek and Fnirsi sendfree review samples to youtubers and bloggers.

author: ptluis
author_rank: Frequent Contributor
timestamp: August 27, 2024, 01:56:55 pm
content: Max voltage 220V with 10x probe selectionInstead of improving the 2ch model dso2512g or even release an improved version, they release a toy for some profit?

author: Aldo22
author_rank: Super Contributor
timestamp: August 27, 2024, 02:36:55 pm
content: Quote from: ptluis on August 27, 2024, 01:56:55 pmYes, strange.Does this perhaps only have to do with the standard probes?I mean 40V (x1) should actually result in 400V (x10).100V/div should also be enough.

author: ptluis
author_rank: Frequent Contributor
timestamp: August 28, 2024, 11:40:05 am
content: Quote from: Aldo22 on August 27, 2024, 02:36:55 pmexactly 400V that's what I expected too. maybe the pcb has some problems dealing with signals above 40V on the input module. I'm not really expert in scope electronics it's just a guess.

author: Fungus
author_rank: Super Contributor
timestamp: August 28, 2024, 12:42:54 pm
content: Maybe it's not a physical limitation.Maybe they just don't want people poking at industrial 3 phase supplies with these.

author: Aldo22
author_rank: Super Contributor
timestamp: August 28, 2024, 01:08:11 pm
content: Quote from: Fungus on August 28, 2024, 12:42:54 pmYes, I think so too. Either that, or a typo.The scope shouldn't care as long as the probe doesn't supply more than 40 volts at the BNC. The scale (max. V/div) is sufficient.

author: Fungus
author_rank: Super Contributor
timestamp: August 28, 2024, 01:35:00 pm
content: More likely just laziness by whoever wrote that.Never equate to stupidity that which can adequately be explained by laziness and ignorance.

author: Aldo22
author_rank: Super Contributor
timestamp: August 28, 2024, 03:03:26 pm
content: Btw, what does 40V mean here?40Vpp or 40Vrms?That's quite a difference.Thanks.

author: ptluis
author_rank: Frequent Contributor
timestamp: August 28, 2024, 03:35:21 pm
content: Quote from: Aldo22 on August 28, 2024, 03:03:26 pmThat's a good question

author: wasedadoc
author_rank: Super Contributor
timestamp: August 28, 2024, 03:49:49 pm
content: Quote from: ptluis on August 28, 2024, 03:35:21 pmRMS is meaningless without knowing the waveform. For example, the peak to peak of a 100v rms rectangular wave with 5% duty cycle is vastly more than the peak to peak of a 100v rms square wave (50% duty cycle).Only peak voltage is a definitive spec.

author: Aldo22
author_rank: Super Contributor
timestamp: August 28, 2024, 04:07:14 pm
content: Quote from: wasedadoc on August 28, 2024, 03:49:49 pmHmm, but that would be strange, since 230V mains is in Vrms.So that would only be about 14Vrms (sine) or 140Vrms at 10x?My Hantek explicitly states the maximum values in Vrms in the manual:Quote from: DSO2000 Manual

author: ptluis
author_rank: Frequent Contributor
timestamp: August 28, 2024, 04:21:44 pm
content: Quote from: Fungus on August 28, 2024, 01:35:00 pmmaybe laziness but I'm not interested in connecting this to 235V AC and find out it will blow at my face. 220V AC is not used anymore in my country it's 235V AC and some times at night 240V ACedit: RMS values

author: wasedadoc
author_rank: Super Contributor
timestamp: August 28, 2024, 04:29:15 pm
content: Quote from: Aldo22 on August 28, 2024, 04:07:14 pmI don't understand what point you are trying to make in that first paragraph.As for the Hantek spec, I repeat my assertion that without specifying the waveform shape it is meaningless. Agreed AC mains is usually sine but scopes look at many waveforms which are not.

author: Gyro
author_rank: Super Contributor
timestamp: August 28, 2024, 04:39:22 pm
content: I don't know how common that style of PCB mount 18650 clip is (I've seen them for AA), but the end of the cell would be acquiring an extra layer of Kapton in my home.

author: Aldo22
author_rank: Super Contributor
timestamp: August 28, 2024, 04:41:16 pm
content: Quote from: wasedadoc on August 28, 2024, 04:29:15 pmWell, you say that a maximum of 40Vpp is possible at the input (BNC).That corresponds to 14.4Vrms with sine wave respectively 144Vrms in 10x mode.That would be far less than the European 230 volts.I'm not sure if that's right.I mean, my pathetic Fnirsi DSO-TC2 can do that -> AttachmentPlus Zeeweii writes in the manual:QuoteSo the specifications are probably in Vrms.

author: Aldo22
author_rank: Super Contributor
timestamp: August 28, 2024, 05:50:41 pm
content: I think I know how to read it now.It's totally nuts.The first value (40V 1x) is in Vp (not Vpp), the second value (220V 10x) is from the marketing department. China has 220V mains, they just want to say that it is suitable for mains.The technical limit is probably 283Vrms (sine).Who wants to try it out?

author: ptluis
author_rank: Frequent Contributor
timestamp: August 30, 2024, 07:17:37 pm
content: Quote from: Aldo22 on August 28, 2024, 05:50:41 pm

author: tunk
author_rank: Super Contributor
timestamp: November 01, 2024, 05:54:01 pm
content: A short promotional video from Zeeweii:https://youtu.be/zUbpIGRi078

author: Aldo22
author_rank: Super Contributor
timestamp: November 22, 2024, 09:09:49 am
content: Almost ridiculously cheap now on AE.https://www.aliexpress.com/item/1005007394192248.htmlShipping, P6100 probe, battery,.. included.Zeeweii produces reasonably mature devices for the lowest price segment.

author: IC_Toaster
author_rank: Regular Contributor
timestamp: November 27, 2024, 03:52:19 pm
content: Quote from: tunk on November 01, 2024, 05:54:01 pmThere is a cursor on FFT mode to see the frequency of the peaks. This makes the FFT mode more useful than the FFT mode of many other devices.

author: jeffs555
author_rank: Newbie
timestamp: December 09, 2024, 10:01:17 pm
content: Have always had a good bench scope, and never really felt the need for a handheld. However, saw this on cyber Monday sale for $33 with free shipping and couldn't resist. It arrived today and overall I am very pleased with it. I have fed it signals up to 100MHz from a tinySA and it syncs to all of them, but it does get a little jittery above 50MHz.The main problem I see with the unit I received is that the compensation on the input divider seems to be way off. At 1MHz, going from 500mV/div to 200mV/div to 100mV/div the display scales correctly. However at higher input frequencies, the scaling gets worse and worse. With 75MHz signal, going from 200mV/div to 100mV/div, the displayed waveform actually shrinks. Don't know if I will try to get it replaced or try to fix it. From the internal photos posted, appears to be a trim cap for internal compensation, so will probably try adjusting that first.

author: jeffs555
author_rank: Newbie
timestamp: December 10, 2024, 06:28:15 am
content: I have done some more testing, and the bandwidth problem I am seeing is only on the most sensitive vertical setting.With a 10x probe at 200mV/div or above, everything is fine and bandwidth seems to be at least 100MHz. However, on mine with a 10x probe at 100mV/div the bandwidth is crap. A 30MHz sine wave shows only half of its actual value, and a 60MHz sine is around 1/3 of its actual value.Hopefully, someone else has one and can let me know if this is just the way DSO1C81s work or if it is a build problem with my unit.

author: Aldo22
author_rank: Super Contributor
timestamp: December 10, 2024, 06:20:06 pm
content: I don't have a DSO1C81, but a DSO2512G.I don't think that's the way it should be.Is the bandwidth limitation off?Probe really at 10x?

author: jeffs555
author_rank: Newbie
timestamp: December 10, 2024, 08:32:48 pm
content: Thanks for responding.You are right that it acts just like the 20MHz limit is turned on, but I am sure it is off. When I turn the 20MHz limit on, all the voltage settings act like the 100mV setting and a 30MHz sine shows half of the actual voltage. It is like the the 100mV setting always has the 20MHz limit even when the limit is turned off.Will try contacting Zeeweii and see what they say.

author: osmax_br
author_rank: Regular Contributor
timestamp: January 28, 2025, 08:36:21 am
content: Quote from: jeffs555 on December 10, 2024, 08:32:48 pmwell , did you contact them in the end ?and after a few months , how do you find the ocsilloscope ?

author: jeffs555
author_rank: Newbie
timestamp: February 01, 2025, 07:04:34 am
content: I still really like the DSO1C81. I have used it a lot more than I expected as it is more convenient than my bench scope. Have not found any other problems, just bandwidth problem on the 100mV 10x setting, and I don't think I will ever need that setting. On all other settings, bandwidth seems to be around 100MHz. I have used it for both RF and digital and it has come in very handy.I tried contacting ZeeWeii through their web site but never received any response, and it hasn't been enough of a problem to worry about.

author: tunk
author_rank: Super Contributor
timestamp: April 01, 2025, 06:27:17 pm
content: A long and postive review by TechCornerTV.At specified bandwith (80MHz) the signal is a bit wobbly.Can show 100MHz (even more wobbly). OK signal generator.https://youtu.be/_EZEou3vVDU

author: vishalkr123
author_rank: Contributor
timestamp: May 04, 2025, 09:53:43 am
content: I purchased Zeeweii DSO1C81 few weeks back. This is my first time with an oscilloscope. I have taken screenshots, but not able to transfer it to my computer. Can anyone please help me on how the trasnfer screenshot? Also, it there any way to save the data points and transfer the data?

author: Aldo22
author_rank: Super Contributor
timestamp: May 04, 2025, 10:42:06 am
content: Quote from: vishalkr123 on May 04, 2025, 09:53:43 amI don't think that's possible. DSO3D12 can't do that either.DSO2512G and DSO1511G can.