Sometimes you wish you had a very small basic oscilloscope that would be easy to carry around as tool for those situations where you need to more measuring that can be done with your multi-meter. One day I found an oscilloscope kit DSO150 while browsing the banggood.com site. This model was originally only available as a kit with a case, but later became available also as ready made device.
I got finally Original JYETech Assembled DSO-SHELL DSO150 Digital Oscilloscope Module 9V 9 that is a ready build pocket scope in case. The packet came with oscilloscope probe.
- Input bandwidth: 0 Hz to 200 kHz
- 2.4-inch color TFT LCD with 320 x 240 resolution
- Number of channels: 1
- Sample rate: max. 1 MS/s
- Input sensitivity: 5mV/Div – 20V/Div
- Input Impedance: 1M ohms
- Maximum input voltage: 50Vpp
- Coupling: DC, AC, GND
- Vertical error: <5 %
- Vertical resolution: 12 bit
- Time base: 10 µs/Div to 500 s/Div
- Memory depth: 1,024 Samples
- Trigger modes: Auto, Normal, Single
- Trigger types: Rising/falling edge
- Trigger position: 1/2 of buffer size fixed
- Calibration signal: 1 kHz / 3.3 V square wave
- HOLD function (capture a transient event)
- Transient store and replay (save/recall waveform function)
- Supply current: 120mA @ 9V
- Dimension: 115mm x 75mm x 22mm
- Weight: 100 gram (not including cables and power supply)
Apart from the input coupling selector switch, the entire operation is controlled by four push buttons and a rotary encoder.
DSO Shell runs on 9V (do not use power voltage higher than 10V!) power supply. Users need to prepare their own power supply since it is not included in the kits. The power jack on the mainboard accepts standare 5.5mm/2.1mm DC plug. Supply current is 120mA @ 9V so I can make it to work with small 9V battery (but not very many hours constant use).
It would be nice to have a battery inside device. There is an alternative 2-pin connector (0.1″ pitch) for supplying power inside device, but inside the small case (115mm x 75mm x 22mm) full of electronics I don’t see there space for batteries. I ended up using external 9V battery that I fixed to the back of case with dual-sided tape. It is not most elegant, but works.
There is one drawback is that the circuit design is not very stable against voltage changes.The zero level disappears easily as the supply voltage levels changed. A quick look at the supplied schematic was enough to identify the problem: the DSO150 doesn’t use voltage regulators to stabilize the input amplifier supplies! Also a Zener diode circuit is used to provide the input voltage offset level for the ADC is less than optimal. The voltage offset is a digital value added or subtracted from the measured input samples by the MCU.
The electronics in this scope is based onSTM32F103C8, which is an ARM Cortex A3 MCU from ST. The MCU also contains a built-in fast ADC (1 Msample per second 12 bits). It offers a resolution of 12 bits and an input voltage range of 0 to 3.3 V so that 1.65 V corresponds to the zero level on the display. In this circuit the offset is a digital value applied to the measured input signal value.
Still even with limitations this mini scope is more than a simple toy and I have found it to be quite usual as a second scope. At €20-30 the unit is really low cost when you consider that includes shipping from the Far East. DSO150 offers quite good performance at low cost as long as you are happy to put up with some minor niggles.The pocket oscilloscope has worked for me well when working with audio frequency circuits. Due the limited bandwidth (only 200 kHz) this scope is not suitable for debugging video circuits or any high speed electronics.
The following videos show clearly what electronics is inside this device (don’t need to do tear-down myself):
DIY $20 Oscilloscope
What is inside
DSO Shell (DSO150) 15001K Oscilloscope Build
Manuals, circuit diagrams and more information:
Firmwares: Click to open
Users Manual: Click to open
Mainboard Schematic: Click to open
Analog board Schematic: Click to open
How to Use the DSO150 Library: Click to open
Source codes: Click to open
FAQ, Tips, and Troubleshooting: Click to open
This is open hardware in a sense that both hardware and software designs are freely available on-line. Source codes for DSO Shell (DSO150) from JYE Tech is available at https://github.com/JYEtech/DSO-Shell-open-source-version-. They are not an exact copy of factory codes (e. g. product testing codes are not included) but have completely the same functions and performance of matching revision. The codes are built with support of the library file libdso150.a, which implements the core DSO functions.
Modification ideas:
DSO150 Shell Li-Po Battery Mod
https://www.youtube.com/watch?
JYE Tech DSO150 Shell firmware update tutorial
https://www.youtube.com/watch?
JYE Tech DSO150 Shell firmware update tutorial
86 Comments
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Product parameters
Maximum real-time sampling rate: 1Msps
Accuracy: 12 bits
Sampling buffer depth: 1024 bytes
Analog bandwidth: 0-200KHz
Vertical sensitivity: 10mV/Div-5V/Div (1-2-5 progressive mode)
Adjustable vertical shift with description
Input impedance: 1MΩ
Maximum input voltage: 50Vpp (1:1 probe), 400Vpp (10:1 probe)
Coupling modes include DC/AC/GND
Horizontal time base range: 10μs/Div-50s/Div (1-2-5 progressive mode)
Automatic, conventional and one-time modes available for easy capture of torque waveforms
Available rising or falling edge triggers
Adjustable trigger horizontal position with instructions
Previously observable trigger waveform (negative delay)
Waveform display can be frozen at any time (hold function)
Self-contained 1Hz/3.3V square wave test signal source
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FNIRSI DSO152 Mini Pocket Handheld Oscilloscope (LED instead of a solar cell)
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▫️ Brand Name: FNIRSI
▫️ Model Number: DSO152
▫️ Display: 2.8 inches/PPI:320*240
▫️ Resolution: 320*240 Pixels
▫️ Lithium battery capacity: 1000mAh
▫️ USB charging: 5V/500mAh
▫️ Size: 99mmx68.3mmx19.5mm
▫️ Weight: 100g
▫️ Band Width: 200KHz
▫️ Real Time Sampling Rate: 2.5MSa/s
▫️ Trigger method: Auto/Normal/Single
▫️ Digital Channels: 1
▫️ Voltage range: 1X 400VPP 10X 800VPP
▫️ Time base range: 10μs/Div-50s/Div
▫️ Vertical sensitivity: 10mV/Div-20V/Div
▫️ Square wave calibration: Frequency: 1K Duty cycle: 50%
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Tomi Engdahl says:
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Excellent video!
I just received the device: the cheap MCU background is obvious, using the derived software as seen with DSO138 DIY oscilloscopes. The fluctuating frequency analysis is clearly because of the limited sample memory and oscillations within the sample window! It works as expected, but that limitation makes it very jittery.
But overall it is brilliant cheap gadget!
I think that the signal generator is not working at the same time with the oscilloscope, but the oscilloscope automatically feeds the square wave when running. But that is good enough for calibrating! If you change the signal generator signal mode, it doesn’t seem to change the calibration mode signal during oscilloscope use!
Thanks for the video! It taught me things, even when I have the device at hand!
Tomi Engdahl says:
[BRAND NEW 2023] Zeeweii DSO154 PRO Oscilloscope 18Mhz 40MSa/s
Is This To Good To Be True?
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00:35 – Welcome
02:09 – Feature Highlights
02:25 – Unboxing & What is delivered
04:31 – First Impressions
06:50 – Operation
12:35 – Testing bandwidth
20:14 – Function Generator
24:54 – Teardown
32:24 – Conclusion
Most of these little scopes always seem to fall flat one way or another and range is usually exaggerated. This one actually seems reasonable. Plus it has a built in function generator!
Thanks for another thorough review. 15MHz is not bad considering it’s advertised at 18MHz. That’s actually a conservative marketing claim for this type of scope as most claim bandwidth more than 3X their real bandwidth. The signal is still useful at 18MHz.
Thanks for the very detailed review as usual Hugo. I really appreciate all the effort you put into making and editing your videos. For the price, this scope is actually very good value. And even though the bandwidth is a little overstated, 15MHz is still very good for that price. It’s amazing how technology has evolved so fast and how cheap some test equipment for hobbyists are now. 10 years ago we would never have imagined we could get this type of scope for such a great price.
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Tomi Engdahl says:
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Hello everyone! What should be a good oscilloscope? Fast, accurate, with good bandwidth, with convenient control and, preferably, inexpensive. This is the kind of oscilloscope I will show in this video. This is an oscilloscope with the ZT-702S multimeter function. The capabilities and characteristics of this device were pleasantly surprised! According to some parameters, the ZT-702S oscilloscope is not inferior to more expensive, professional devices. In this video I will tell you in detail about all the features and modes of operation of the oscilloscope.
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https://www.youtube.com/watch?v=9NOkuuEfNSQ
In this video the new Zoyi ZT702S Oscilloscope + Multimeter in a compact version and lot of quality.
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00:35 – Welcome
01:36 – Feature Highlights
02:08 – Unboxing & What is delivered
06:05 – First impressions
07:47 – Operation
15:28 – Waveform display & Bandwidth test
23:36 – AC voltage measurement
24:44 – DC voltage measurement (calibrator)
29:28 – DC voltage measurement (mv reference board)
32:57 – Resistance measurement
34:49 – Capacitance measurement
36:49 – Continuity testing
37:40 – Diode (LED) testing
38:11 – Conclusion
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Tomi Engdahl says:
https://hackaday.com/2023/09/28/fixing-a-c64-with-a-cheap-20-oscilloscope/
Tomi Engdahl says:
Digilent’s Analog Discovery Pro 2230 Aims to Deliver Pro-Grade Oscilloscope Functions in Compact Box
Connecting to WaveForms, or LabVIEW and MATLAB, this display-free oscilloscope punches well above its weight.
https://www.hackster.io/news/digilent-s-analog-discovery-pro-2230-aims-to-deliver-pro-grade-oscilloscope-functions-in-compact-box-51949525e24c
Tomi Engdahl says:
EEVblog 1597 – Zoyi ZT-703S $80 2CH 50MHz Oscilloscope/Multimeter Review
https://www.youtube.com/watch?v=kpzNVsSmUu0
Looking at the new $80 Zoyi/Zotech ZT703S Dual channel 50MHz 25,000 count 0.05% handheld oscilloscope/multimeter compared to the single channel 10MHz 10,000 count ZT702S
https://s.click.aliexpress.com/e/_DeS…
ZT-702S review: • EEVblog 1540 – The $80 Zotek ZT-702S …
Forum: https://www.eevblog.com/forum/blog/ee…
00:00 – The new $80 ZT-703S vs the $60 ZT-702S
03:40 – Power on and screen differences
06:25 – Multimeter
07:49 – The Bargraph is still a complete JOKE
08:50 – Power-off memory test
09:41 – Dumb Arse Dave BRICKS the ZT-702S !
10:23 – The SAME current measurement FAIL
12:19 – 0.05% ?
13:17 – Same BNC connector issue
13:44 – The signal generator is still a joke
15:53 – Trigger level issue FIXED
16:39 – Range overload bug FIXED
19:10 – Teardown
25:07 – Oops…
25:21 – Battery life and current consumption test
26:54 – Conclusion
Tomi Engdahl says:
EEVblog 1540 – The $80 Zotek ZT-702S Osciloscope Multimeter REVIEW
https://www.youtube.com/watch?v=aUU-PGUnd0E
Tomi Engdahl says:
EEVblog 1582 – FNIRSI DPOX180H 180MHz DPO for $123?
https://www.youtube.com/watch?v=HR6_Lp7fH_c
Tomi Engdahl says:
OWON HDS2202S 200 MHz 3-in-1 Handheld Oscilloscope Review/Teardown
https://www.youtube.com/watch?v=1UaankSg1YI
Tomi Engdahl says:
Best Digital Oscilloscope | Who Is THE Winner #1?
https://www.youtube.com/watch?v=LsLkqwKIhGw
Tomi Engdahl says:
EEVblog 1597 – Zoyi ZT-703S $80 2CH 50MHz Oscilloscope/Multimeter Review
https://www.youtube.com/watch?v=kpzNVsSmUu0
Looking at the new $80 Zoyi/Zotech ZT703S Dual channel 50MHz 25,000 count 0.05% handheld oscilloscope/multimeter compared to the single channel 10MHz 10,000 count ZT702S
00:00 – The new $80 ZT-703S vs the $60 ZT-702S
03:40 – Power on and screen differences
06:25 – Multimeter
07:49 – The Bargraph is still a complete JOKE
08:50 – Power-off memory test
09:41 – Dumb Arse Dave BRICKS the ZT-702S !
10:23 – The SAME current measurement FAIL
12:19 – 0.05% ?
13:17 – Same BNC connector issue
13:44 – The signal generator is still a joke
15:53 – Trigger level issue FIXED
16:39 – Range overload bug FIXED
19:10 – Teardown
25:07 – Oops…
25:21 – Battery life and current consumption test
26:54 – Conclusion
https://www.eevblog.com/forum/blog/eevblog-1597-zoyi-zt-703s-$80-2ch-50mhz-oscilloscopemultimeter-review/
Tomi Engdahl says:
The Perfect CHEAP Multimeter/Oscilloscope For Beginners ZOYI ZT-703S
https://www.youtube.com/watch?v=Po_2bXn6Ba8
If you are just starting your vintage hardware repair journey this combination digital multimeter and two-channel oscilloscope is the perfect starter tool for you. The ZOYI ZT-703S or Aneng AOS03 packs quite a punch. Let’s try it out and see what it can do!
Tomi Engdahl says:
Another cheap scope: $18, shipped! (FNIRSI DSO152)
https://www.youtube.com/watch?v=iG0-0R9qYWU
I picked up this $18 oscilloscope the other day because I was curious how good something this cheap can actually be. For me, the ultimate test to see if something is useful is to try to fix a broken 8-bit computer with it… so let’s do exactly that!
– Links
FNIRSI DSO152: (Currently $24 as of making of this video, price will fluctuate, was $18 a couple weeks ago)
https://www.aliexpress.us/item/1005005644784105.html?gatewayAdapt=4itemAdapt
Tomi Engdahl says:
https://hackaday.com/2024/08/14/handheld-oscilloscope-meter-reviewed/