DreamSourceLab DSTouch / DS4T1012 / DS4T252 - Page 1
Forum section: electronics / testgear

author: Aldo22
author_rank: Super Contributor
timestamp: December 07, 2023, 02:27:28 pm
content: I'm a little astonished that there is no thread about the DSTouch on EEVblog.The pocket 150Mhz touch scope is quite interesting, isn't it?https://www.dreamsourcelab.com/product/dstouch-series/https://www.aliexpress.com/i/4000454483213.html

author: RAPo
author_rank: Super Contributor
timestamp: December 07, 2023, 04:02:39 pm
content: I've got the DS4T1012, a really fine instrument. Together with their LA (DSLogicU3Pro16) a very nice portable set for work in the field.Beware the DS4T1012 *cannot* connect with DSView.

author: ceut
author_rank: Regular Contributor
timestamp: May 21, 2024, 11:45:24 am
content: Hello,I'm looking for buying a DSTouch too, and I'm also a little suprised that there is no more information about DreamSourceLab products in Eevblog.So I decide to write them to have some informations, after viewing the great Kerry Wong youtube review.I have somegood news to share, thanks to their support team(+ agreement)=>New products are coming this year !>In june: A new lower cost DSOTouch will come out, with a bandwidth of 50Mhz.>Later this year: new higher-end DSOTouch will come out.And they will haveIntensity Grading! (either when they will come out, or later with FW update)Also, they have fixed the pulse problem that Kerry Wong has reported to them.They also told me that they will not do much marketing promotion on them, because they are actually working on them, and they prefer that users spread the word.About Eevblog, they told me"We truly appreciate and value the recognition from this group of users": it is great to read thatSo, I'm waiting for these new portable DSO, and I will buy one of them, intensity grading is the thing that I was waiting on a portable DSO(not speaking about FNIRSI dpox180h not-finished-product)

author: theoldwizard1
author_rank: Regular Contributor
timestamp: June 22, 2024, 01:24:17 pm
content: Quote from: ceut on May 21, 2024, 11:45:24 amAny further rumors on the high end version ?4 channels ?Larger display/higher resolution ?More samples/second and more storage are ALWAYS nice !

author: theoldwizard1
author_rank: Regular Contributor
timestamp: June 22, 2024, 01:55:40 pm
content: Looks like the low end version is available through AliExpress. Clearly aimed at the Miniware DS212 !DST212I found this description on eBayDS4T212 70M/200MSa/s/2Mpts Portable Digital Oscilloscope Signal GeneratorDS4T212 70M/200MSa/s/2Mpts Digital Oscilloscope Signal Generator Portable Handheld OscilloscopeFPGA and DRAM:- Its core consists of a powerful FPGA hardware waveform processing engine and DRAM memory, rather than an MCU-basedsoftware implementation. DRAM and FPGA is essential for high frame rates and smooth waveforms.Ultra-high Waveform Refresh Rate:- Its real-time performance is better than that of ordinary MCU solutions.- DS4T212: The maximum acquisition time at 200M sampling rate can reach 10ms+60Hz screen refresh rate. The total waveformwindow time in 1 second is 10ms*60=600ms.Bandwidth and Sampling Rate:- Taking the DS4T212 as an example, with a bandwidth of 70M and a swept sine signal of 0-100M, the entire frequency range canbe displayed normally, and the amplitude drops smoothly. With a bandwidth of 70M, it can still trigger and display a sine wavesignal of 92M stably. But at -3db, its bandwidth is still only 70M. Our oscilloscope labels true real-time sample rates, not equivalentsample rates. The oscilloscope provides a variety of interpolation methods to perfectly restore high-frequency square waves.Storage Depth:DS4T212 can acquire 300Hz amplitude-modulated 10M sine wave signals. Its storage depth is as high as 2Mpts, which is more thanthe depth of some desktop oscilloscopes. It also maintains the same storage depth at full horizontal resolution. The signal acquiredwith our oscilloscope can be scaled up and down at any time after stopping, perfectly reproducing the waveform you want.Accuracy and Noise:- The original high-precision oscillator (for EPSON) with low temperature drift and hardware real-time frequency measurement areused. High-precision frequency display with three decimal places reserved- DC/DC power supply ripple analysis: measured millivolt level of weak signals, support 20M bandwidth limit. Tool for power supplyripple measurement- It has a minimum vertical sensitivity of 10mV/div and less background noise- Withstand voltage of BNC input terminal ± 200V- When used with a X100 high-voltage probe, the oscilloscope can measure signals of ±2000V. When measuring high voltage,please pay attention to grounding. The high-voltage probe should be purchased separately.Touch Screen to Operate:- The oscilloscope is designed with a complete set of "single finger touch" operation. All functions are simplified into 1-3 steps oftouch and swipe, so users can use the buttons and menu easily.- With 2 taps, you can add/remove a measurement option. 20 automatic measurement options available.- The horizontal resolution supports single-finger swipe adjustment of the entire waveform area. At the same time, the roller areacan be quickly adjusted by dragging and dropping.- Extensive channel control options are available vertically, with wheel adjustment. Support quick adjustment by dragging anddropping.- It supports storage and on-boarding in 9 configurations. In order to adapt to different measurement scenarios, users can switchconfigurations with one click.More Functions:- X-axis/Y-axis curved cursor- Lissajous figure in X-Y mode- Afterglow display- Signal generator- File featureIndustrial Design:- Pock-sized high-performance oscilloscope- Size: 117 x 77mm/4.6 x 3" (excluding the size of knobs)- Integrated soft rubber wrapping and hard plastic support shell. The four corners of the equipment prevent collision- Anti-wear protection strip for the front screen- Built-in bracket for different elevation angle support- Fanless: say goodbye to noise- Long endurance time: with built-in high-capacity lithium battery, it can work for 6 hours. Support sleep mode when there is nooperationTechnical Parameters:Horizontal System:- Real-time sampling rate: 200MSa/s- Equivalent sampling rate: 1GSa/s- Maximum acquisition time at the highest sampling rate: 10ms- Time base range: 5ns/Div-10s/Div- Storage depth: 1Mpts (dual channel); 2Mpts (single channel)Vertical System:- Bandwidth: 70MHz- Input coupling: DC or AC- Input impedance: 1MΩ//~16pF- Vertical sensitivity: 10mV/Div to 5V/Div- Vertical resolution: 8bits- Input withstand voltage range: peaks ≤ 250V- DC accuracy: ±4%- Vertical position: ±5 divisions- Vertical offset: ±5 divisions ±100mV to ±50V/Div- Common-mode rejection ratio: none- Channel isolation: noneTrigger System:- Trigger mode: Automatic Normal (ch0 and ch1)- Trigger position: 0%~100% sampling depth- Hold-off range: 0~1s- Trigger Type: Edge (rising or falling)- Trigger sensitivity: 0~0.625 grids- Trigger level range: +4.4 gridsWaveform Measurement:- Cursor: Y-axis and X-axis cursor- Manual measurement: width/frequency/period/voltage amplitude- Automatic measurement: frequency/period/+duty cycle/-duty cycle/+pulse number rising edge/falling edge/+pulse width/-pulsewidth/burst pulse width/amplitude/high level/low level /rms/average/peak-to-peak/maximum/minimum/+overshoot/-overshootWaveform Display:- Time-domain waveforms: Real-time waveform acquired in a single shot (high frame rate hardware processing engine)- X-Y mode: Lissajous figureSignal Generation:- Waveform type: sine/square/triangle/sawtooth wave- Waveform frequency: 0-100KHz- Square wave duty cycle: 10%-90%- Waveform amplitude: 0-3V (min Vpp=0.5V)Extended Interface:- Mini-HDMI: Extends acquisition based on other sensors- BNC: Extended Current/Differential Probes

author: AceyTech
author_rank: Regular Contributor
timestamp: June 25, 2024, 11:38:14 pm
content: Quote from: theoldwizard1 on June 22, 2024, 01:55:40 pmSorry to barge in, but the DS4T212 is one of their existing scope offerings.It's been perpetually out of stock since I found them last winter.maybe in anticipation of the new low end model?The new 50Mhz DStouch isn't out in the public yet.Warning: there have been some reports of unauthorized clones of their scopes out in the wild, so I would advise against ordering from anyone but DreamSourceLab or an official channel.

author: TomKatt
author_rank: Frequent Contributor
timestamp: June 26, 2024, 12:10:45 am
content: Quote from: AceyTech on June 25, 2024, 11:38:14 pmFor some reason I feel like their original logic analyzer has been cloned on various markets for many years now. I’m also suspicious of several low price DSlogic Plus models - they don’t ‘feel’ authentic. Probably a hazard of Chinese manufacturing organizations and how they seem to ‘share’ a lot between them…Of course, one could argue Karma is a factor (the whole Sigrok thing) lol…. But I digress - I have a DSlogic Plus LA I bought direct and have been very satisfied with it.

author: ceut
author_rank: Regular Contributor
timestamp: July 09, 2024, 02:26:13 pm
content: A little update after receiving some news from DreamSourceLab great support.=>The new "lower" model has just came out50Mhz Bandwitdh, vertical resolution of 1mV/DIV and ultra-low background noise in the μV range.It also includes FFT and real-time decoding functions.https://www.dreamsourcelab.com/shop/oscilloscope/dstouch-ds4t252/I have one on the way, and post a little unboxing/review after receiving itAlso, as I can understand from their PDF: it is the same as the 2 previous model, so I think it will be a real bang for buck productNot a single portable DSO at this price point has all these features, including a real FPGA and DRAM insideThe firmware is also the same, and for those who have one, a new "final" v1.00 version from May is here:https://www.dreamsourcelab.com/download/(=>Scroll down to see the changelog, on the right you will see the blue part for the DSTouch)(the previous 0.99t one was in beta-state)

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: July 10, 2024, 03:54:48 pm
content: These seem to be pretty neat pocket scopes but having no proper PC connection is a weird decision. Maybe they wanted to protect their DSCope range which isn't really appealing to me.I'd hope they reconsider this at some point...

author: ceut
author_rank: Regular Contributor
timestamp: July 11, 2024, 08:21:48 am
content: Quote from: 0xdeadbeef on July 10, 2024, 03:54:48 pmHello,There is an USB Mode to upload/download files like screenshot between computer and the DSTouch (page 50 from usermanual/2.13.4 chapter).But there is no possibility to use it as an USB-only DSO mode.In fact, this type of "dual" DSO mode doesn't exist in the market.You will find mainly either DSO without screen (USB-only mode), or DSO with Screen, on the higher-end level side with hdmi port and/or network connection for viewing the screen and controlling the DSO remotely (with little lag).Also, for me: I was looking at the smallest portable DSO with FPGA and about all I have on my Siglent for field usage (without powering on or pluging on any computer), so this is the model that seems to fit my need

author: jchw4
author_rank: Regular Contributor
timestamp: July 11, 2024, 10:30:29 am
content: Quote from: ceut on July 11, 2024, 08:21:48 amThis is not completely true. I believe that most modern portable scopes have full remote capability.At the top side you can look at R&S RTH1000 series.From the "economy" side all Hantek DSO1000 serieshttps://www.hantek.eu/category/digital-oscilloscopes/handheld-oscilloscopes/(or maybe all their handhelds) support full remote operation.There is a huge thread on this forum on "expanding" these scopes and adding Ethernet option (which seems to be uncommon).See alsohttps://github.com/OpenHantek/openhantekproject.

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: July 11, 2024, 02:45:27 pm
content: Yeah, adding a USB port and than using it just for a pathetic USB flash drive mode, feels like wasted potential.

author: ceut
author_rank: Regular Contributor
timestamp: July 13, 2024, 08:18:23 am
content: Quote from: jchw4 on July 11, 2024, 10:30:29 amI don't like the Hantek 2C/2D low cost series - I have checked them when I was looking for a portable DSO.Also, at higher price of these 2: all Micsig are better (Android with big touchscreen, full wifi support, intensity grading, great performance...).The STO1004 seems to be a great model.I don't have this DSOTouch yet, but in this form factor (ultra portable, fanless, good touchscreen,1 second boot time and price point and many benchtop-like functions): there is almost no real competition actually in the market. There is even the possibility to change the color of the tracesThe Kerrywong review shows about everything, even the UI seems to be good.Also, newer models which will come out later this year will have intensity grading: hope this will be added also on the DS4T seriesAnd DreamSourceLab does very good USB DSO/LA too, so I don't hink they need to mix all of them.Maybe later they will add Wifi on them ? But then: the boot time will not be as low as 1 second (expect 30s) because they may have to put a linux-like OS inside ?I will use it for some car-things checking, and also to be away from earth-ground for some mesurement like audio amplifier.=>All of these are my personal opinionsWhen I will receive it, I will refine my opinion

author: jchw4
author_rank: Regular Contributor
timestamp: July 13, 2024, 10:52:12 am
content: Quote from: ceut on July 13, 2024, 08:18:23 amSure, these were discontinued in 2014. So it was recent design 15 years ago!They are no way better, but they do have decent remote control.

author: ceut
author_rank: Regular Contributor
timestamp: July 29, 2024, 07:13:58 pm
content: Hello,A little follow-up after receiving my DSOTouch DS4T252 (50Mhz bandwidth).I have tried to make an unboxing+review here (in french because my english speaking is.....but there are subtitles) :I'm not a professional "Youtuber" and I don't have any good camera except my old Android phoneI hope it will help some of you who, like me, are looking for a portable, affordable, fast and silent DSO with a FPGAI have put all the information in the video descriptionAlso, I have been in touch with their support, they are really nice and reply fastSo I highly recommend this little DSOEdit: A funny checking I have done some minutes ago2 great tools together mesuring each parts of the other one

author: ceut
author_rank: Regular Contributor
timestamp: July 31, 2024, 09:24:11 pm
content: I continue to discover and play with my newtoy, and I have tried to use it with my 2 Micsig probes: the MDP700 Differential Probe, and CP2100B Current ProbeHere are the photos with live voltage test, CC test, and high voltage measurement with a strange led tester TD3HNo problem at all, it was super easy to set Volt/amp and to useI finally can go and make some signal checking outside home with these 2 probes and the DSOTouch(example: check TV PSU)

author: svetlov
author_rank: Regular Contributor
timestamp: August 24, 2024, 11:37:40 am
content: dearceutcouldn't you show how it will display different types of modulation? and fast sweep mode exposing the frequency swing time in milliseconds from 10 to 100 milliseconds (on the video saw your generator 6600-it has this capability) if you have an Oscilloscope Micsig or any other -perhaps you can check you sample amount per second(number of displayed oscillograms per second)?Thank you so much that you did the first video review

author: ceut
author_rank: Regular Contributor
timestamp: August 26, 2024, 05:28:03 pm
content: Quote from: svetlov on August 24, 2024, 11:37:40 amHello,Thank you for your message, I'm happy that my non-profesional youtube video was useful to youOn my small JDS6600, I have only 3 modulations type: Sweep/Pulse/Burst (and I only use Sweep for audio testing).I have made a quick video (as always at 60fps, I like that filming mode) comparing with my Siglent with the lower memdepth for the fastest showing on screen, and the DS4T252 is really faster and smoother than my Siglent on the screen refresh(I have not checked that before).Also, the DS4T has no PASS/FAIL BNC, so I don't know how to check the amount of sample/second ?I have made a .zip from my phone .mp4 shrinked video, you can check it and you will see the refresh rate is really super fastHope this is what you wanted to see ?Also, now when I need to check quickly some signal (on PSU for example), I use the DS4T - it boots so quickly, portable and no ground reference so no problem with loopIt has a great battery life tooNot a single flicker when the signal is stable, as my SiglentThe screen is very clear and readable without any problem.(so the photo was easy to take)Don't take account of the voltage values, I have forgotten to remove x10 scale on the on DS4T and the x20 on Siglent

author: hp lee
author_rank: Newbie
timestamp: November 25, 2024, 01:11:12 pm
content: Quote from: svetlov on August 24, 2024, 11:37:40 amHope this helps.

author: PinheadBE
author_rank: Regular Contributor
timestamp: December 16, 2024, 12:48:25 pm
content: @ceutHow much did you pay as import taxes etc.... ?I am very interested in getting one, but I woud like to know beforehand what I've got to pay....Thanks,

author: ceut
author_rank: Regular Contributor
timestamp: December 18, 2024, 10:05:28 am
content: Quote from: PinheadBE on December 16, 2024, 12:48:25 pmHello,It is very difficult to tell from country to country how much it could be.For me, I have to pay about 130e with all.

author: ceut
author_rank: Regular Contributor
timestamp: December 18, 2024, 10:16:34 am
content: Here is a photo I have made, after going to see a friend who has some problem to power a 12v fridge for his car.The setup was:- 2 channels used- DS4T252 probe on channel 1- Micsig CP2100B Current probe on channel 2 at x100We can clearly see the steps of compressor starting, with the increasing Amps drawn in the first millisecond, then falling to as stable value (pink trace).Also, we can see the voltage ripple on the yellow trace.With that: my friend has bought a PSU that can handle the starting current for use it on mains socketFirst is a photo taken from my phone with the 2 channels.Second is a screenshot made directly from the DS4T252 menu (only channel 2), then exported to my Windows computer

author: geochaben
author_rank: Newbie
timestamp: January 03, 2025, 03:10:48 pm
content: I have mine on order. It looks like DSview v1.3.2 can interface with the DSTouch oscilloscopes now.

author: coromonadalix
author_rank: Super Contributor
timestamp: January 03, 2025, 03:46:40 pm
content: if they hear from here the comments and possible bugs or add functions, maybe theses could get more tractiontime will tellnice little pups thks for the non professional video

author: RAPo
author_rank: Super Contributor
timestamp: January 03, 2025, 03:51:52 pm
content: I don't think so. DSView can handle input from theirusb-scopes, not the touch series.Quote from: geochaben on January 03, 2025, 03:10:48 pm

author: geochaben
author_rank: Newbie
timestamp: January 03, 2025, 04:50:45 pm
content: I was too hasty. I see you are right from the DSView manual. Any hope they will add DSTouch in the future?

author: RAPo
author_rank: Super Contributor
timestamp: January 03, 2025, 05:05:18 pm
content: I don´t think so. I emailed them, and they said DSViiew was only for the usb-scopes and the LA's.

author: cynric
author_rank: Newbie
timestamp: January 07, 2025, 06:54:43 pm
content: Did you guys test the protocol decoders yet? I'm a little irritated on how they want to decode SPI from 2 inputs - is it just a clock synchronous single lane de-serializer? Or does it calculate the sampling points from a manually-entered clock rate and hooks up to a chip select and a data line? Two data lines and nothing else? Lots of options are thinkable, but none would strike me as ideal.. And the manual doesn't go into detail at all.Beside from that I really like what I'm seeing. How about pre- and post-trigger options in single-shot or normal mode? Is that possible over the whole buffer depth? Like setting the trigger on the very end of the acquisition period and then zooming in and scrolling through the whole data set.Is it then possible to add a protocol decoding layer afterwards?I've had a DSLogic U3Pro16 for years, am really fond of it and actually prefer it over the Saleae at work, so the high-speed DSTouch might be a good company for that. Probably much better than the Fnirsi DPOX180H I got last year (which I do like, but has so many not thought-through short-comings)..Thanks guys!

author: jebem
author_rank: Regular Contributor
timestamp: August 18, 2025, 05:55:14 pm
content: Quote from: ceut on July 29, 2024, 07:13:58 pmRef. Model DS4T252Thank you for your honest reviews!I was looking for a low cost handheld oscilloscope able to acquire signals in the order of 1mV, a Holdoff Trigger, and using the required hardware components to implement a "proper" design.I believe this is the one. So I have just ordered it from the DreamSourceLab shop in AliExpress.These guys at DreamSourceLab go to the point when advertising their oscilloscopes - No smoke and lights, just straight technical information.Also I put here (Thank you, Aldo) a review from the well known Kerry Wong covering this model. He seems to be non biased when reviewing products.Here for thisDS4T252model:

author: jebem
author_rank: Regular Contributor
timestamp: August 19, 2025, 03:06:18 pm
content: Brief comparison between the main hardware components used on the DSTouchDS4T1012(150MHz ) and on the DSTouchDS4T252(50MHz).The cheaper DS4T252 50MHz model shares many components with the DS4T1012 150MHz model like the FPGA, MCU, Flash memories and Battery management.However, it uses a much less capable ADC/sampling clock generator, and a smaller Waveform sampling storage.So far couldn't identify the Vertical channels active components due to low resolution pictures taken from Chinese videos.Here the cheaper DS4T252 feature a 1mV/div, while the DS4T1012 keeps on the safe side with just 10mV/div.That said, the Kerry Wong review on the DS4T252 shows a lot of noise, around 300 to 500uV when selecting the 1mV/div scale.Well, we can't expect a low cost device to perform like a high end one.Component_description|DS4T1012_(PCB:_TOUCH1G-V1011-P0715)|DS4T252_(PCB: DST252-V911-P0524)PCB upper side||MCU|STM32H750ARM Cortex M7|STM32H750ARM Cortex M7Waveform sampling storage|9DK17 D9PTKMT41K128M16JT-125 2Gbit DRAM|W9864G6KHwinbound 64MbitBattery Manager|BQ25601|BQ25601High Speed Data Processing|XC6SLX16xilinx SPARTAN-6 FPGA|XC6SLX16xilinx SPARTAN-6 FPGAVertical channels ADC|HAD15111000MSPS (one-channel), 500MSPS (two-channels)|MXT2088200MSPS (one-channel), 100MSPS (two-channels)ADC Sampling Clock Generator|ADF4360-724-pin IC, Integrated Synthesizer and VCO|8-pin IC??Close to the ADC, but can not see details due to low resolution picturesPCB under side||128Mbit Flash Memory|W25Q128JVwinbound|W25Q128JVwinbound64Mbit Flash Memory|W25Q64FVwinbound|W25Q64FVwinboundReferencesDS4T252 (50MHz) Analysis and teardown (Chinese language):https://www.bilibili.com/video/BV1in9nYtE2q/DS4T1012 (150MHz) Teardown with analysis by Kerry Wong:http://www.kerrywong.com/2023/09/29/teardown-of-a-dreamsourcelab-dstouch-ds4t1012-oscilloscope/#google_vignette

author: jebem
author_rank: Regular Contributor
timestamp: August 26, 2025, 03:53:12 pm
content: Just received my new toy DSTouch DS4T252.Very compact unit.First impressions are all positive.Very good carrying case.Complete set of cables: USB-C to USB-A male, MCX Signal Generator output to BNC male, and two P6060 X1/X10 Oscilloscope probes.Firmware V1.0.

author: jebem
author_rank: Regular Contributor
timestamp: August 27, 2025, 02:14:57 pm
content: Absolutely random, non controlled, not properly impedance adapted lines, tests on my new DreamSourceLab DSTouchDS4T252unit.1. BatteryIt seems that it arrived with a fully charged battery, if the batt. indicator is to be believed.After playing with the oscilloscope settings and features for around 1.5 hours, the batt. indicator was around 75%.So it seems the claimed battery life of 3-6 hours is achievable, even if keep the meter busy to avoid it to enter into idle sleep mode.Charging current was 5VDC at around 1.5A (with battery at around 75% charge state).2. High level signal handlingUsed a less than ideal Juntek JDS-2900 Signal Generator - Very noisy and amplitude imprecision at low amplitude levels and a bit jittery as well.Trigger is almost perfect, and the Trigger Holdoff feature is very efficient handling those noisy/complex waveforms.2.1. Single channel:A 10 kHz square wave is captured perfectly.A 20 MHz square wave is still recognizable as such with a bit of goodwill. Above that, it becomes a sinusoide.A 20 MHz sinusoidal wave is captured perfectly.A 50 MHz sinusoidal wave is captured easily, although with a small attenuation - It goes above that without issues despite increasing attenuation.2.2. Dual channel:Up to 47 MHz sinusoidal wave is still acceptable, although with some artifacts, jitter, and strange voltage reading - Above that, measurements are all erratic.3. Low level signal handling1mV/div internal noise. As seen on some YT video reviews, it indeed shows around 700uV of internal noise.Shorting the BNC input didn't reduce it.I went away from the noisy workbench to a balcony with no electrical cables and turned off the router. Same result.This noise is being picked from internal EMF sources, and the oscilloscope shows erratic frequency readings changing with time base as well.10 kHz square wave 3mVpp, registered as 5.9mVpp at 1mV/div and 20uS/div.A lot of noise coming from the Signal Generator.To trigger this waveform in a stable way, the Trigger Holdoff was set around 60% of the sliding bar.Same 10 kHz square wave 3mVpp, registered as 4.3mVpp at 1mV/div and 20nS/div.

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: August 27, 2025, 06:50:56 pm
content: What I find pretty much underwhelming here is the total lack of any trigger options beyond the bare minimum.According to the manual, there is only a rising edge or falling edge trigger. There is note even a "both edges" trigger, letting aside all the other most basic trigger options (Pulse Width, Nth Edge, Timeout etc.) which would have been really, really easy to implement.Admittedly, an edge trigger is the one you will need most but they really didn't put any kind of effort here to do more than the absolute minimum.

author: ptluis
author_rank: Frequent Contributor
timestamp: August 27, 2025, 08:24:31 pm
content: Your Juntek is really noisy. I post two photos of my unit using a Feeltech 6800 and Uni-T UTG932+ (+ means 30MHz model hacked to 60MHz)The time to fully charge DS4T252 is 2h38, total capacity 3137mAhThe ground noise on my two DS4T252 units are between 566uV and 600uV

author: jebem
author_rank: Regular Contributor
timestamp: August 28, 2025, 12:33:04 pm
content: Quote from: ptluis on August 27, 2025, 08:24:31 pmYap, the Juntek JDS-2900 was a low cost buy just to have something able to generate large signals at 50MHz here in my mom's home where I spend more time than on my home 500km away.Thanks for checking the low level signal registering using better Signal Generators.It seems that most of the noise seen on your pictures is related to the oscilloscope vertical amplifier internal noise.Did your scope triggered in auto mode those small signals, or did you had to enable trigger holdoff?

author: jebem
author_rank: Regular Contributor
timestamp: August 28, 2025, 12:39:15 pm
content: Quote from: 0xdeadbeef on August 27, 2025, 06:50:56 pmIndeed.Apparently the trigger options are very limited on these low cost oscilloscopes.However this model features Trigger holdoff (up to 1 second), something that most of these cheap models miss. It is really useful to get a stable registration while keep sampling and displaying on complex waveforms like AM modulated signals of the ones I posted above with a mix of square wave with lost of added noise.

author: ptluis
author_rank: Frequent Contributor
timestamp: August 28, 2025, 02:25:02 pm
content: Quote from: jebem on August 28, 2025, 12:33:04 pmDid you try running your Juntek from battery? you will reduce noise dramatically. My Fy6800 was running from AC but my UTG932 is running from battery.Regarding triggering, my 2 scopes DS4T252 were able to trigger in Auto mode these small signals, after triggering the signal I just had to adjust vertical resolution from 2mV to 1mV manually, in fact the trigger is able to catch really slow signals of 1Hz and adjusting the horizontal in roll mode.The only time I had to use Holdoff was in AM signal 10MHz sine carrier with 300Hz sine modWhen trigger is not able to show a stable signal in Auto triggering, I can easily get the signal to show manually. But won't happen to often.I'm really surprised how good this device is, measurements are accurate within specs and between different units I didn't notice differences using the same cabling set, maybe 2-3 digits nothing to be worry about, DC signal are accurate. Really good. FFT is usefull with accuracy hardly seen on pocket devices. I'm able to use FFT on mV square signals and it is able to identify correctly all harmonics.I've found this device casually, never heard of them although their around for a few years. I glad I found them.Also they told me that a 4Ch portable scope is in development, no release date yet, I'm looking forward to seeing it.

author: jebem
author_rank: Regular Contributor
timestamp: August 29, 2025, 08:07:21 am
content: Quote from: ptluis on August 28, 2025, 02:25:02 pmDidn't tried on batteries, as I only use it for large amplitude signals. I have no doubt that its AC SMPS adapter is a major source of noise.The test on small signal was intended to see how the DS4T252 would handle a complex signal like that, and it passed in flying colors.For lower signals I use a TinySA Ultra, and sometimes I get nostalgic and use my old HEATHKIT IG-102S RF signal generator to troubleshoot old radios as a hobby.EDIT:I have just recall that I have a FY6900-40 at home and it is also noisy at low levels, despite having a slightly better power supply.The issue is the same, SMPS are noisy by nature and it must be contained, something that low cost devices don't have.Below a picture of it.Later on, I added ferrite beads to the power supply DC flat cable but it had negligible effect.Then I got the components to power it from rechargeable batteries with battery management kit, but again, these instruments are not really good at supplying low level signals, so I forgot about it all and got the TinySA Ultra.

author: dcm
author_rank: Newbie
timestamp: August 29, 2025, 09:55:43 am
content: I am looking for advice for amateur use in a home workshop: audio circuits, automotive diagnostics, and testing power supplies, e.g., ripple and noise measurements.I am considering buying the DS4T252 or the Owon HDS2102S. I’m stuck — which one would you choose?

author: ptluis
author_rank: Frequent Contributor
timestamp: August 29, 2025, 12:42:30 pm
content: Two more photosAWG UTG932+Battery operated50 cm coaxial cable RG316No 50 ohm terminationAM signal10MHz sinewave Carrier (Amplitude of 3mVpp and 10mVpp)300Hz sinewave mod at 100%Stable signal archived using holdoff feature

author: ptluis
author_rank: Frequent Contributor
timestamp: August 29, 2025, 03:16:33 pm
content: Some DC measurements comparing with DM40CVoltage reference chip is AD584LHThe DS4T252 has an option called "amplitude fine tuning" to manually calibrate DC values, but I didn't do it because I don't feel the need to. For me the displayed values are accurate enough.

author: jebem
author_rank: Regular Contributor
timestamp: August 29, 2025, 04:26:30 pm
content: Quote from: dcm on August 29, 2025, 09:55:43 amI believe any one of those two models will serve you well as handheld oscilloscopes to be used in aworkbench at home.However the Owon HDS2102S form design may also fit well in the field/harsh environments due to its more rugged case, and it includes a multimeter.Not that the DS4T252 is fragile, but its case style seems to be less practical to be used in the field IMHO.

author: jebem
author_rank: Regular Contributor
timestamp: August 29, 2025, 04:39:30 pm
content: Quote from: ptluis on August 29, 2025, 03:16:33 pmImpressive. I was not expecting that level of precision on these low cost scopes.So far, the only thing I don't like in the DSTouch DS4T252, it is the case construction.It seems that it is caseless - They just sandwiched the assemblies and then applied vulcanized rubber around it to form a case.It seems to be virtually impossible to open this case to peek around inside without deforming or even destroying the rubber case.After looking to some videos where it has been dismantled, I am not keen to do the same thing on my unit

author: jebem
author_rank: Regular Contributor
timestamp: August 29, 2025, 06:13:18 pm
content: One DS4T252 internal EMF noise source found (probably not unique but surely it is the larger one).Colour TFT displays with TouchScreen are a well known major source of EMF interference.(I have several advanced DSP receivers and only the ones equipped with a colour TFT display are picking up strong interference when using the local telescopic antenna on LW, MW and even HF lower bands. In practice this is not a real issue as we tend to use external antennas enough far away from the display.One of them uses a colour touchscreen (TS) display and is the worst offender. This is because they do use TS polls instead of interrupts to detect a pressure).As I suspected, the colour display with TS used in this DS4T252 oscilloscope is not different, and it indeed generates a lot of EMF interference.To verify this issue, I used another low sensitivity oscilloscope (a Zeeweii DSO3D12 on 10mV/div) with a short loop probe at X1, and move the probe around the DS4T252 device.The largest noise is clearing coming from the front left lower corner, decreasing fast when moving the probe away from it.This TS display noise seems to being picked up by the vertical amplifiers and visible when selecting the maximum sensitivity of 1mV/div.I suspect that the vertical amplifiers may not be shielded or are insufficiently shielded at the PCB side facing the Display.

author: ptluis
author_rank: Frequent Contributor
timestamp: August 29, 2025, 07:32:27 pm
content: Quote from: jebem on August 29, 2025, 04:39:30 pmYes that's what I don't like either, to disassemble it we need to unglue the protective rubber, but let's hope we don't need to replace the battery for a long time.This scope also runs directly from the charger but I've noticed that from time to time it is topping up the battery,I did some consumption tests when the scope is running from the charger (although I don't recommend because of the increased noise it adds to signals, better to run from batteryThe following values may vary depending on what the scope is doing, I tested with a simple sinewave:Backlight 1/31CH, RUN, 540mA, 2.703W1CH, STOP, 395.4mA, 1.977W2CH, RUN, 592.6mA, 2.963W2CH, STOP, 385.2mA, 1.926WWhen both channels are enabled the increased consumption is around 260mW (52mA!)Battery life: 2CH ON, RUN, triggering sweep 1KHz - 1MHz sine wave, after 5 hours the battery indicator was still green, then I had to turn off everything. So with some care it's possible to reach 6 hours or more.It is able to trigger CAN signals although it cannot decode (yet) for obvious reasons. "Yet" means, maybe they add it.Post your bugs or dream features you would like to see added to the next firmware release.And that's all folks!

author: ptluis
author_rank: Frequent Contributor
timestamp: August 29, 2025, 07:56:51 pm
content: Quote from: jebem on August 29, 2025, 06:13:18 pmInteresting that I couldn't replicate the noise test the same way you did it, can't see any noise on both scopes. Only if I set vertical to 1mV/div on the scope with the probe I'm able to see the "noise" at 1.5mV levelThen i decided to try a different approach instead of a shorted loop, i used a ferrite inductance as an antenna to "amplify" the noises and I'm able to detect more information from the lower middle to the left, on the back you can get a stronger noise detection.With the little trick of using a "ferrite inductance" you can even "see" smps control chip working signals without having to touch the chip

author: lapinc
author_rank: Newbie
timestamp: August 29, 2025, 09:12:06 pm
content: Quote from: ptluis on August 29, 2025, 03:16:33 pmSomehow "Amplitude Tuning" does not work on my unit - it is present in the menu (along with the "Auto Calibration"), but, unlike "Auto Calibration", nothing happens when I choose it.

author: ptluis
author_rank: Frequent Contributor
timestamp: August 29, 2025, 10:23:58 pm
content: Quote from: lapinc on August 29, 2025, 09:12:06 pmNot on mine either. i haven't tested it because auto calibration was done correctly. Anyway I'm making a list to send to dreamlabs containing small bugs on UI, improvements and features that could be added to the scope. This bug was added.

author: jebem
author_rank: Regular Contributor
timestamp: August 30, 2025, 11:22:48 am
content: Quote from: ptluis on August 29, 2025, 07:56:51 pmMy probe is just a 100MHz oscilloscope probe set on X1 and shorted by the ground cable to form a small loop, and the oscilloscope was set to X1 as well, with 10mV/div.Try moving the probe *slowly* around the border of the left lower corner of the DUT as seen in my pictures, where the antenna is the ground cable.A little deviation and the signal indeed reduces dramatically and fade away on a 10mV/div scope.My DUT unit is generating in excess of 20mVpp on a single point that I guess is closer to the Touch Screen IC from the front side. This TS chip is installed on the flat cable. This noise amplitude and frequency readings changes with the selected time base on the probing oscilloscope.If you can't detect it, probably you have a different version of DS4T252 hardware assembly.My DS4T252 unit measures in excess of 700uVpp of internal noise on 1mV/div, while yours shows quite lower levels of noise.I wonder if the manufacturer didn't install the shield covers at the front side of the PCB assembly facing the display on some production batches from where my unit came from.That would partially explain why your units are quieter than mine.Anyway, I am not planing to open my unit at this time to check the shielding.

author: ptluis
author_rank: Frequent Contributor
timestamp: August 30, 2025, 03:49:06 pm
content: Quote from: jebem on August 30, 2025, 11:22:48 amI'll repeat the test again tonight and see if I can catch anything like you did.when did you bought your scope? I bought both directly from the manufacturer, the first one 15 days ago, and the second 7 days ago. Overall I'm satisfied with them, the 2M memory are really handy. My understanding is that they are still working on them, improving the firmware and correcting bugs.

author: ptluis
author_rank: Frequent Contributor
timestamp: August 30, 2025, 08:07:11 pm
content: Quote from: jebem on August 30, 2025, 11:22:48 amI just redid the probe loop test the same way has you did, this time I used 200MHz probes and there's no noise on both scopes, can't find a single spot were noise come out like yours.Are you sure that noise doesn't come from any other device you have connected? like a led bulb?On the photo I post now, the above scope was set to 1mV/div notice the small spikes it captures from the DUT yellow line one, up to 200uV amplitude

author: jebem
author_rank: Regular Contributor
timestamp: August 30, 2025, 08:17:16 pm
content: Quote from: ptluis on August 30, 2025, 03:49:06 pmMy unit was ordered around two weeks ago fromDreamSourcelab Storeon AliExpress.I am quite happy with this DSTouch DS4T252 model, it is a great oscilloscope that features touch screen controls (very handy), and with two features that I was looking for on a low cost device:Trigger holdoff and1mV/div sensitivity;While the "deep" sample storage is not so important to me, it is good to have it, and apparently is not impacting the performance of the device (more stored data may take more time processing it leading to missing events - I guess the FPGA/MCU are doing a fine job here).The shipped firmware was v1.00 (the same one available for download at their website).While I acknowledge that it may have some bugs like the ones you mentioned, it seems very stable in operation and I am happy with it as it is.In general, I don't expect low cost devices to have much attention from the manufacturers, but some of these Chinese makers cares about the customers enough to try to fix the bugs.I find this 500 - 700uVpp noise a little intriguing, because it is a large value when compared to the 1mV/div sensitivity they specified.While I still find it useful, I can't stop thinking on how did they missed this.I understand that they had to design a amplifier stage with a minimum gain at least 10 times higher than what is seen on oscilloscopes with just 10mV/div (like the other more expensive DSTouch DS4T1012 is using).Hence the increased noise, but I still think it comes from internal EMF sources, like the TS Display and Power Supply that for some reason were not properly shielded, and not from the OpAmps themselves.If the case could be opened in a regular way, I would check it. Obvious causes would be insufficient (1) shielding and (2) power supply decoupling at the vertical gain stages.

author: jebem
author_rank: Regular Contributor
timestamp: August 30, 2025, 08:24:12 pm
content: Quote from: ptluis on August 30, 2025, 08:07:11 pmThat is not possible in the test I did because, as seen in the posted pictures, I have no noise picked up until the DS4T252 is powered up.And the noise is clearly coming from that lower left corner at a very specific place were the probe GND cable was placed.Clearly your oscilloscopes were built differently from my unit. I find no other explanation.

author: jebem
author_rank: Regular Contributor
timestamp: August 30, 2025, 08:30:27 pm
content: Quote from: jebem on August 30, 2025, 08:24:12 pmDid you see the Kerry review on YT?Please see at 9:22 where he checks the 1mV/div sensitivity.He got basically the same noise I have on my unit.Here:

author: ptluis
author_rank: Frequent Contributor
timestamp: August 30, 2025, 08:46:49 pm
content: Quote from: jebem on August 30, 2025, 08:30:27 pmProbably you got one of the first batches, the same as he did, because the new box is smaller, that's my guess. And as I told you I bought directly from Dreamsourcelab.

author: jebem
author_rank: Regular Contributor
timestamp: August 31, 2025, 01:58:34 pm
content: Quote from: ptluis on August 30, 2025, 08:46:49 pmYes, most probably there are at least two different hardware builds of this DS4T252 model.And that is a good thing, it means they are addressing the issues.Meanwhile I found some YT videos advertising the DreamSourceLab DSTouch DS4T252, and in one of them someone claims90uVrmsof noise at 1mV/div.The small letters clearly state that "The noise level data is based on empirical measurements and may vary slightly due to environment factors".Also they omit in what conditions they got that reading.Now, those90uVrmswould translate to 90*1.414*2 =254uVpp.on pure sinusoidal waveformsonly. Here we have a complex waveform.Checking Google AI and it enthusiastically assures me that for noise signals (assuming Gaussian noise distribution) we may multiply the RMS value by 6.6 to get Pk-Pk.If we try that, we get 90 * 6.6 =594uVpp, and this is close enough to my readings on the oscilloscope.OK, to check that, I went to my balcony where there are no external EMF sources close by, switched the DS4T252 on and set it 1mV/div.Only this time I have choseRMSin addition toFreqandPk-Pkmeasurements.As I was guessing by now,the above claim from someone seems to be valid: My unit never went above90uVrmsin any time base.And the FPGA/MCU must be doing a good work estimating the RMS value from the Pk-Pk readings (or vice-versa).For my testing, please see the attached pictures.DS4T252_noise_floor_1mVdiv_10mS: Time base at 10mS/div, reading 1.551 MHz, 800.000 uVpp, and 88.549 Vrms.DS4T252_noise_floor_1mVdiv_10nS: Time base at 10nS/div, reading 18.578 MHz, 366.667 uVpp, and 77.544 Vrms.See the advert here at 0:30 playtime:

author: ptluis
author_rank: Frequent Contributor
timestamp: August 31, 2025, 04:39:24 pm
content: Quote from: jebem on August 31, 2025, 01:58:34 pmI just finish two more tests, my idea is to see how the scope is capable of catching and displaying bellow 2mVpp sine and square wave signals.Since my UTG932+ only drop to 2mVpp I inserted a 52ohm termination so that the signal that goes to the scope be reduced to approx half of the original amplitude.Frequency used: 1MHzLet me add this, this generator is outputing 2.667mVpp, i haven't figured out how can I calibrate the UTG932. If anyone know the "secret" kindly share it. Thanks

author: dcm
author_rank: Newbie
timestamp: September 01, 2025, 12:54:43 pm
content: I'll repeat the test again tonight and see if I can catch anything like you did.when did you bought your scope? I bought both directly from the manufacturer, the first one 15 days ago, and the second 7 days ago. Overall I'm satisfied with them, the 2M memory are really handy. My understanding is that they are still working on them, improving the firmware and correcting bugs.How do you know they are still working on the software? Do you think we can expect an update soon?

author: ptluis
author_rank: Frequent Contributor
timestamp: September 01, 2025, 06:27:36 pm
content: Quote from: dcm on September 01, 2025, 12:54:43 pmHow do you know they are still working on the software? Do you think we can expect an update soon?Because they told me to report back bugs, improvements, etc so I'm assuming that they're working on it. can't tell you 100% that a new firmware is going to be released. We just have to wait and see.

author: dcm
author_rank: Newbie
timestamp: September 02, 2025, 05:59:35 am
content: Because they told me to report back bugs, improvements, etc so I'm assuming that they're working on it. can't tell you 100% that a new firmware is going to be released. We just have to wait and see.I wrote to them asking about new models, and they replied that there are no portable oscilloscope models scheduled for release in the near future. So let's hope they'll continue working on these.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 02, 2025, 08:11:00 am
content: Quote from: dcm on September 02, 2025, 05:59:35 amI wrote to them asking about new models, and they replied that there are no portable oscilloscope models scheduled for release in the near future. So let's hope they'll continue working on these.Yesterday I sent an email with my feedback with photos, videos, etc. we'll see if they reply. I have my expectations but with a pinch of salt because we know how these Chinese companies work and that is: WYSIWYGAnyway for me the scope is good enough to have in my pocket for quick checks, the 1 sec boot is really nice to have, it's the most accurate I tried in this form factor, even the FFT won't let down. The one finger touch concept is almost perfect except minor situations. I can easily check PS ripple, turn on/off overshoot detection, signal glitches, signal instability, CAN detection although can't decode, UART decode fine, SPI and I2C haven't tried yet because I don't have my test board with me.I've been comparing displayed signals with my siglent and there's not much of a difference, of course if I need a more accurate analysis I use the bench scope. But don't expect this little device to be a bench scope replacement because it won't.I see this portable scope as my swiss pocket knife and being battery operated is really good to avoid those annoying signal interferences that come through the AC line.It's an addictive portable little thing (but I'm suspect because I'm a fan of portable stuff) and for 100 bucks!That's my personal opinion, everyone else has their own according to their needs and expectations

author: dcm
author_rank: Newbie
timestamp: September 03, 2025, 01:17:23 pm
content: I’m about to buy a DS4T252 (for hobby use: audio, car diagnostics, power supply testing), but I’m still torn between it, Owon HDS2102S and Hantek TO1112D.DS4T252 – nquite big screen, touchscreen, nice GUI, good battery life, high vertical sensitivity, FFT, RMS support, but only 50 MHz bandwidth.HDS2102S – higher bandwidth and built-in multimeter, I know more rugged for field work, though I’d mostly use it at home.TO1112D – looks most feature-complete with a 7″ screen, but I’ve seen mixed reviews (bugs, freezes, slow performance).Has anyone here tried all three and can share some advice?Currently I’m using this old DSO Quad, but the menu makes it pretty frustrating:https://www.seeedstudio.com/DSO-Quad-4-Channel-Digital-Storage-Oscilloscope-p-736.html

author: porter
author_rank: Regular Contributor
timestamp: September 03, 2025, 04:15:23 pm
content: FYI, DS Scopes cannot save and transfer captured data (only screen shots).

author: ptluis
author_rank: Frequent Contributor
timestamp: September 03, 2025, 05:27:00 pm
content: Quote from: porter on September 03, 2025, 04:15:23 pmAnd what exactly do you miss? can you clarify?

author: ptluis
author_rank: Frequent Contributor
timestamp: September 03, 2025, 08:53:12 pm
content: Quote from: dcm on September 01, 2025, 12:54:43 pmThe following is a reply I received today from DreamSourcelab about one of my reports:"Regarding the issue mentioned at the start of the email about the “Amplitude tuning” feature not responding, this feature is not implemented in the current DS4T252 firmware. We will add this function in a future firmware update."So, my understating is that they're working on a new firmware update.

author: dcm
author_rank: Newbie
timestamp: September 04, 2025, 08:55:55 am
content: Quote from: ptluis on September 03, 2025, 08:53:12 pmSo there is a pretty high probability that I will update, so today I ordered my DS4T252 through their website

author: ptluis
author_rank: Frequent Contributor
timestamp: September 04, 2025, 09:57:50 am
content: Quote from: dcm on September 04, 2025, 08:55:55 amYou won't regret, if you are like me that love portable devices you will like it. The more I play with it the more I like it, and this scope is a real time sample rate, really good for non continuous signals.If you have any wishes of functions you would like to see added to the scope please let me know. Maybe they add some to the next firmware, we can dream right?

author: Frex
author_rank: Regular Contributor
timestamp: September 05, 2025, 05:48:20 am
content: Hello,I think also to order one DS4T252, seem very valuable device for in the field measurements.Anyway I don't know if I must order it directly from Dreamsourcelab web site, or via Aliexpress store.I'm located to France and I don't know what would be the amount of duty if ordered to them directly.Any feedback of buyers ?Regards.FRex

author: dcm
author_rank: Newbie
timestamp: September 05, 2025, 06:20:07 am
content: Quote from: Frex on September 05, 2025, 05:48:20 amYesterday I ordered the DS4T252 directly fromhttps://www.dreamsourcelab.com/shop/oscilloscope/dstouch-ds4t252/For Poland it’s 0% customs duty + 23% VAT (so around $122 instead of $99). There’s only a small handling fee on delivery because of the customs declaration. Today I got a PayPal notification that it has been shippedOn AliExpress it’s more expensive and there’s a risk of fakes – one seller even said it’s “original but without the original box.” That’s why I prefer buying directly from the manufacturer to be sure it’s genuine and under warranty.

author: Frex
author_rank: Regular Contributor
timestamp: September 05, 2025, 08:35:26 am
content: Thanks for your feedback dcm.I did as like you, I ordered it from their web site.Now, time to wait..Frex

author: dcm
author_rank: Newbie
timestamp: September 12, 2025, 11:46:11 am
content: Quote from: Frex on September 05, 2025, 08:35:26 amIt was supposed to take 3 weeks and I expected to pay additional VAT. I ordered DS4T252 from DreamSourceLab on 04.09, and by 11.09 the package was already in Poland – only 7 days, with no extra fees or VAT. In the end, I paid just $99.So far, just unboxing and learning how to use it. I really like the interface – great UI, and the price-to-performance ratio is truly impressive. The company replies quickly and thoroughly to emails – excellent support. Now it’s time for some testing…

author: Serg65536
author_rank: Regular Contributor
timestamp: September 20, 2025, 07:10:13 pm
content: My arrived today.It's a great tool!1mV maximum sensitivity!!! It's unique!FFT and protocol decoding are very usefull!Trigger is reliable, 2MB memory.I'm very happy with it!It would be very interesting to compare DS4T252 with the Zeeway DSO3D12.

author: Serg65536
author_rank: Regular Contributor
timestamp: September 20, 2025, 08:15:44 pm
content: With 50 Ohm termination BW is 55MHz.But, when connected to generator to 50 Ohm output through the supplied P6060 probes bandwidth rizes to 75MHz.Not bad.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 21, 2025, 09:07:01 am
content: Quote from: Serg65536 on September 20, 2025, 07:10:13 pmI'm glad that you like it, it's an addictive little device isn't it? If you have any suggestions to improve, like new functions, Ui, bugs, etc post here.

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: September 21, 2025, 09:35:48 am
content: Again, it's a bit sad that they didn't invest a bit more thought/effort into the trigger system. E.g. a protocol trigger or at least something like triggering on the start/or stop bit of an UART communication would have been helpful.Also, I understand that it's not possible to store the currently measured waveform and transfer it to the PC (offline). Obviously only screenshots and "session files" (settings) can be transferred to the PC. That's also a major letdown.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 21, 2025, 03:26:52 pm
content: Quote from: 0xdeadbeef on September 21, 2025, 09:35:48 amIn what format to save waveform data? csv, bin?

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: September 21, 2025, 04:21:19 pm
content: Whatever. Usually scopes offer both, a binary and csv format.

author: Serg65536
author_rank: Regular Contributor
timestamp: September 21, 2025, 08:53:04 pm
content: Quote from: ptluis on September 21, 2025, 09:07:01 amThank you for the great device!1) So far the major concern is the waveform save function!It would be nice to set a button shortcut for it: power+start, or power+auto, or double power. Please, consider to make shortcuts for both the waveform save and the screenshot save command.It would be much more effective to have a binary waveform save format. CSV format is storage space consuming.2) FFT analysis function should have ability to turn off the waveform view.To achieve the best FFT quality it's necessary to adjust waveform to fill all the screen space. But in this case the FFT graph become hardly readable.3) It would be nice to have basic trigger information always on screen.The "DreamSourceLab" text is NOT what users want to see there! It's reasonable to leave your logo in the corner, but NOT the full name.Much better would be to see the trigger level, slope and channel information near the "trig" menu entry.4) It would be nice to make the measurement stickers less prominent.Please, consider to add transparency and make it dim. So that the waveform would be more visible in the area.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 21, 2025, 10:32:11 pm
content: Quote from: Serg65536 on September 21, 2025, 08:53:04 pmHi first let me clarify that I'm not DreamSourcelab team, I'm a user like you but I'm cooperating as a tester. I'm allowed to send information to a given email. I report back, bugs, desired features, suggestions, etc, etc they collect all info and their engineers will study the possibility to apply every information sent to a new firmware update. So we just have to wait and see.Btw did you know you can move both V cursors at same time? the same with H cursors

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: September 23, 2025, 06:42:52 pm
content: I just wonder: most people here fancy the 50MHz version. Is this because of the 1mV/div or the price or both?

author: ychat
author_rank: Newbie
timestamp: September 23, 2025, 07:24:42 pm
content: Quote from: 0xdeadbeef on September 23, 2025, 06:42:52 pmI think this is because with 1mV/div sensitivity and 2Mpts storage depth ds4t252 has no competition in the sub-$100 range.But ds4t1012 price-wise is close to the entry-level 12 bit oscilloscopes, making it a hard choice.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 23, 2025, 10:03:21 pm
content: Quote from: ychat on September 23, 2025, 07:24:42 pmAt 100 bucks, there's no competition on battery operated scopes, that offer the same quality. For me quality is not displaying beautiful graphics, UI, nice icons,etc it's all about thrust in what I see and the accuracy of what it can measure. 50MHz and 2M is more than enough for my objectives. I thought on buying the ds4t1012 but 1mV is more important to me than 16M deep memory or 150MHz bandwidth. Of course some polishing would be nice, and since they accepted my feedback, I'm cooperating with them looking forward for a new firmware release, it doesn't cost nothing to try right? even if they don't release a firmware update, the scope is more than enough for most of the tasks. For me it was a good choice, specially having a device on my pocket with a long battery life.

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: September 23, 2025, 10:14:27 pm
content: It's just that 200MSa/s are somewhat underwhelming, and 100MSa/s in dual channel mode are pretty much bottom (Shannon-Nyquist) level for a 50MHz scope.The DS4T1012 has three times the bandwidth but five times the sample rate. And I guess there is absolutely no other pocket scope with 1GSa/s sampling rate or is there?

author: ptluis
author_rank: Frequent Contributor
timestamp: September 23, 2025, 10:49:41 pm
content: Quote from: 0xdeadbeef on September 23, 2025, 10:14:27 pmI don't know any other brand that offers the same in pocket size, this is the only i have found. There are some tablet cheap ones but not really of much use. If you don't really need a pocket one, you'll have options like the Rigol DHO800 series or the Owon ADS800A series. Both are able to be powered by USB-C port. Obviously not pocket size tho.

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: September 23, 2025, 10:55:38 pm
content: I already have a proper desktop scope, I'm just toying with the idea of having something (very) portable.But most probably I will be able to convince myself that I don't really need that anyway.

author: Serg65536
author_rank: Regular Contributor
timestamp: September 24, 2025, 05:10:12 am
content: Quote from: 0xdeadbeef on September 23, 2025, 10:55:38 pmThis scope is really good at measuring differential voltages inside a circuit.The lower the size - the higher impedance stuff you can measure. You can just connect it without a probe with a short wire.There could be no match from mains powered or big oscilloscopes.No currents from a mains PS,no antena effects, nonoise picked up from a probe.Multiply this by 1mV sensitivity!Perfect!

author: ptluis
author_rank: Frequent Contributor
timestamp: September 24, 2025, 08:46:05 am
content: Quote from: Serg65536 on September 24, 2025, 05:10:12 amTry to connect a ferrite inductance between the ground and tip of the probe to act as an antenna (like I showed a few posts back) approach it to smps ps, chargers, etc and you're able to clearly see the control chip working even without opening the case, and with the advantage of no emi noise injected by mains power like almost happens with bench scope specially if you're in places with lots of electrical noises and bad ground connections. You also can view injectors cycle on automobile work without direct connecting it to the harnesses. I have others small cheap scopes and none work like this. My guess is this one being a true real time sample one, just my guess.

author: Serg65536
author_rank: Regular Contributor
timestamp: September 24, 2025, 09:41:57 am
content: Quote from: ptluis on September 24, 2025, 08:46:05 amYes, that'shigh sensitivity + reliable and fast trigger + real time sampling + high acquisition rate.The best device in such a form factor and price!

author: Atlan
author_rank: Frequent Contributor
timestamp: September 24, 2025, 10:40:08 am
content: I would have liked a 7-inch screen, this is too small. Yes, it's fine for a pocket, but it needed a screen for control and display.

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: September 24, 2025, 02:27:46 pm
content: Quote from: Serg65536 on September 24, 2025, 05:10:12 amSure, you can do that - with one channel - and it's still somewhat problematic. A scope running from a battery is not the same as an isolated scope.If the ground of the scope is actually on a high level, the bare metal metal BNC connectors are a safety hazard.Quote from: Serg65536 on September 24, 2025, 09:41:57 amWell, a scope without a "reliable" trigger is not a scope. Not sure what a "fast" trigger is. A trigger is a trigger. And again, the trigger system is about as basic as can be.Side note: there is no trigger jitter specified. Actually, I couldn't find any specification for the accuracy of the time base, either."Real time sampling" is something that every normal scope does. Most modern scope also perform some kind of "equivalent time base sampling" for cyclic signals (and if the real time sample rate is not sufficient), but that doesn't change the fact that they are real-time sampling scopes.And about the "high acquisition rate": again there is no (maximum) number specified for waveforms/s. Most modern scopes sit somewhere between 50k and 1 Million, so if I had to guess, the DsTouch scopes would be more on the low end of this.But sure, the DS4T252 is probably better than most offerings in the ~100€ range. But this is mainly because most of them are total garbage or outdated.Still, the form factor is the most interesting feature but also kinda limits the actual use cases. Fiddling around on such a small screen is problematic, protocol decoding is nearly useless due to the screen size, the limitation to two channels and the lacking trigger options.I fear that even though it's kinda cool, I would mainly buy it to buy it but would rarely actually use it.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 24, 2025, 03:02:02 pm
content: Checking frequency of an old Toyocom TCO 64.000MHz. Just straight connection to the output. Haven't build the test circuit on datasheet.The sample rate is exactly 200MS/s measured with cursors.Spot on!

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: September 24, 2025, 03:21:12 pm
content: Hm.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 24, 2025, 05:43:00 pm
content: Quote from: 0xdeadbeef on September 24, 2025, 03:21:12 pmWhat you mean by Hm? do you have any doubts?I have these modules for many years maybe 20 or more and they are surprisingly accurate today. The same with Citizen ones. And this scope is really competent in measuring frequency. The one on the photo is still exactly 64.000MHz and is one of the modules I use for testing.This is Made in Japan not those Chinese crap ones

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: September 24, 2025, 05:58:19 pm
content: The data sheet seems to define the frequency stability as +/- 100ppm. That would be worse than any normal XTAL and make it pointless as frequency standard.But maybe I'm reading it the wrong way.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 24, 2025, 06:20:21 pm
content: Quote from: 0xdeadbeef on September 24, 2025, 05:58:19 pmThe frequency stability of a TCO in ppm indicates the maximum acceptable deviation of its output frequency from its nominal frequency over a specified period or range of environmental conditions. But it's not mandatory that a deviation must exist at a certain temperature range for example, i always test it between 22-24 degrees C and compare it with my Siglent before any testing. And as you probably know Japan make the best modules, they are known for their precision/stability that's why they're expensive. Besides what will be my purpose in deceiving results? I'm just showing why I like this scope.

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: September 25, 2025, 03:03:16 pm
content: And still, the absolute deviation is unclear. Even a OCXO trimmer with a GPSDO has some frequency error.Besides, "64,000MHz" could means a few hundred Hz deviation. Which still would be a pretty low deviation, but most probably not "spot on".E.g. 64000444Hz would also be displayed as 64,000MHz and it still would be a (rather good, but not great) 7ppm deviation.Anyway, given that they brag about using an "EPSON high-precision low-temperature drift crystal oscillator", they could have specified the time base stability/accuracy in the data sheet.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 25, 2025, 04:19:34 pm
content: Quote from: 0xdeadbeef on September 25, 2025, 03:03:16 pmThe DS4T252 its a 5 digit Frequency measurement on MHz scale meaning when you try to measure frequency on a MHz signal you can only get info down to KHz. In case of the 64.000MHz module with +-100ppm, the deviation accepted is +-6400Hz, meaning Minimum frequency: 63,993,600 HzMaximum frequency: 64,006,400 Hzso this module is within specs, so in perfect condition.One of the features I asked DreamSourcelabs to add is a frequency counter.

author: tol
author_rank: Regular Contributor
timestamp: September 27, 2025, 08:29:33 am
content: Hi, I've read the thread but I couldn't find any posts about how to open the device to replace the battery. Some people write that the enclosure is glued. Can it be opened without damaging it? After 3-5 years of use, when the battery finally dies, there may appear more interesting models and some people would prefer to buy a new oscilloscope rather than replace the battery, but still, I think many people would like to replace the battery instead of buying a new device, especially the owners of the more expensive DS4T1012 model.And yet another question, is it worth overpaying for DS4T1012 for home and hobby use, or DS4T252 is more than enough? I've read the thread and some people write that the DS4T252 sensitivity is 1mV/DIV with hundreds mVolts of noise, so I couldn't understand what's the use of such a sensitivity with such a high level of noise, when the noise will not allow to see the little amplitude signals anyway. Does DS4T1012 also have such a noise? If it doesn't have such a noise, the 10mV/DIV of "clean" output may be even more preferable than 1mV/DIV of "dirty" output to find weak signals. Or if I don't understand something, please clarify.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 27, 2025, 12:40:12 pm
content: Quote from: tol on September 27, 2025, 08:29:33 amTo open the device search on YouTube for Kerry Wong video on the DS4T1012 he show and explain how to do it.The differences between DS4T1012 vs DS4T252 are mainly bandwidth 150MHz vs 50MHz, sample rate 1GS/s vs 200MS/s, deep memory 16M vs 2M, vertical scale 10mV vs 1mV. The functionality is the same, with the same results.Regarding measuring mV signals, a few posts back I posted a photo showing a 2mV sine wave captured with DS4T252 at 1mV/div.What model should you choose? well it depends on what frequencies your working at. The DS4T1012 is way more expensive and price close to a better rich features Bench scope like the new Owon ADS800A series or the Rigol DHO800 series.One correction the noise floor on 1mV/div is around hundreds uV (micro volts) not mV.

author: tol
author_rank: Regular Contributor
timestamp: September 27, 2025, 03:07:02 pm
content: Quote from: ptluis on September 27, 2025, 12:40:12 pmWhen exactly 1mV/div may be useful in real life? I mean, when we deal with digital electronics, even +/- 0.2 Volts in the signal doesn't make difference in most cases, and many chips don't care of 0.8 V difference, so I'm not sure if this 1mV/div sensitivity with 50Mhz is better than 10mV/div with 150MHz, although I don't need it eitherJust want to find out what model is the most useful for its price. 200MS/s is rumored to be not enough for 2 channels. I've got Zoyi ZT-703s and it has (kind of) 280MS/s, and it also seems to be not enough for its (kind of) 50Mhz bandwidth.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 27, 2025, 03:27:58 pm
content: Quote from: tol on September 27, 2025, 03:07:02 pmFor me 1mV is useful because I have the need to test sensors that operate up to 50mV or lower, sometimes on the 0-8mV range.If I need better analysis or above 50MHz, 1GS/s I use a bench scope. If the upper model drop is price to half, I'll get one.This pocket size although very capable in many tasks won't totally replace a good bench scope.I bought it for its good battery life, size, touch screen, and being a little device that I can trust what I see.For decoding it can do the job but it's better a 4CH oneI see this little device as a kind of Swiss knife.

author: tol
author_rank: Regular Contributor
timestamp: September 28, 2025, 04:44:26 am
content: Quote from: ptluis on September 27, 2025, 03:27:58 pmSo you think 200MS/s in enough for this 50Mhz device?

author: ptluis
author_rank: Frequent Contributor
timestamp: September 28, 2025, 09:29:03 am
content: Quote from: tol on September 28, 2025, 04:44:26 amIf you want to capture 50MHz sine waves YESif you want perfect square waves NO.200MS/s display a 50MHz square wave as sine wave.For a good representation of a square wave you need one with much higher bandwidth and sample rate something like 350MHz bandwidth 500MS/s it will be able to capture up to the 7th harmonic, but they will be expensive ones.5MHz square waves are displayed fine.10MHz it's acceptable to understand it's a square waveSo you first need to know what type of signals you're looking at, their frequency, then search for an adequate oscilloscope.

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: September 29, 2025, 10:05:59 pm
content: Quote from: ptluis on September 27, 2025, 12:40:12 pmFor the record: it's a destructive disassembly: since the whole thing is held together by the rubber housing which is glued to the other parts, he broke the rubber part during disassembly and then the rest fell apart.Also the battery is glued in. I.e. changing the battery is not really intended. So, after a few years, you are supposed to throw it away.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 29, 2025, 11:11:39 pm
content: Quote from: 0xdeadbeef on September 29, 2025, 10:05:59 pmI don't think it's destructive to the point of throwing to the trash. The glue is not strong and easily get loose. With a little care it's possible to remove the rubber housing without destroy it. If you slow charge it, it will last many years. I own several battery powered devices for more than 10 years and the batteries still hold 90-95% of the capacity. It's all about slow charging to 98% and never let them overheat during the process. The battery of one of my test ebikes with 47000Km still maintain a capacity of 98% after 8 years of use.

author: tol
author_rank: Regular Contributor
timestamp: October 12, 2025, 05:06:47 am
content: Does anyone know the screen resolution of this device? It's only mentioned that it has an ips 4.3 inch, but there is no info about resolution.I'm trying to chose between DSO3D12 and DS4T252, the price is basically the same, but they seem to be rather different in specs. Maybe somebody has both devices and can make a comparison in terms of measurement precision, stability and reliability, how both devices work in the same test tasks? Why I'm asking is because I have Zoyi703 and it is also kind of good in specs but it's trigger doesn't work properly in real life (can miss signals and events), so I cannot rely on it.

author: danno_cj
author_rank: Contributor
timestamp: October 12, 2025, 09:09:44 am
content: Resolution from screenshots is 480x272. Trigger holdoff adjustable up to 1 second it is a feature that is not found on similar price range scopes. I don't have zeeweii scope but if I compare both the only situation when zeeweii win is when you don't have any multimeter. Even if you are in this situation take note about this: the dmm integrated in zeeweii is very basic and there are a lot of cheap dmm that perform at least as this zeeweii 3 in 1 scope.