DSO150 pocket oscilloscope

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.

Characteristics

  • 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?v=r0_PCgIMGJc
JYE Tech DSO150 Shell firmware update tutorial
https://www.youtube.com/watch?v=PUEimY59vaU
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

    Reply
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  9. Tomi Engdahl says:

    FNIRSI DSO152 Mini Pocket Handheld Oscilloscope (LED instead of a solar cell)
    https://www.youtube.com/watch?v=LjYTCzC6r5A

    ▫️ 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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  10. Tomi Engdahl says:

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  14. Tomi Engdahl says:

    FNIRSI DSO-TC3 Teardown
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    28:09 – Function generator
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    35:49 – Probe compensation
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    41:43 – Conclusion

    FNIRSI DSO-TC3 Review
    https://www.youtube.com/watch?v=mAxUwG2US4U

    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!

    Reply
  15. Tomi Engdahl says:

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    02:25 – Unboxing & What is delivered
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    06:50 – Operation
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    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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  16. Tomi Engdahl says:

    zeeweii-dso154pro oscilloscope
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    Reply
  17. Tomi Engdahl says:

    FNIRSI-138 PRO Handheld Digital Oscilloscope 2.5MSa/s 200KHz Analog Bandwidth Support AUTO,80Khz PWM And Firmware Update
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  18. Tomi Engdahl says:

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  20. Tomi Engdahl says:

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  21. Tomi Engdahl says:

    [BRAND NEW 2023] Zeeweii DSO154 PRO Oscilloscope
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    Reply
  22. Tomi Engdahl says:

    Zeeweii/SigPeak DSO2512G Oscilloscope 120 Mhz, 2 Channels and a bunch of features!
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    Reply
  23. Tomi Engdahl says:

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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

    Reply
  24. Tomi Engdahl says:

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    https://www.aliexpress.com/item/1005003085753955.html
    https://www.aliexpress.com/item/1005005201633325.html?pdp_npi=2%40dis%21EUR%21%E2%82%AC145.33%21%E2%82%AC74.12%21%21%21%21%21%40210318e816950434864767458eafb8%2112000034163295324%21btf&_t=pvid:b633975c-a180-4aab-b954-86b2338ecb75&spm=a2g0o.ppclist.product.mainProduct
    https://www.aliexpress.com/item/1005005441492216.html?pdp_npi=2%40dis%21EUR%21%E2%82%AC139.34%21%E2%82%AC86.39%21%21%21%21%21%40210318e816950435204447705eafb8%2112000035203840623%21btf&_t=pvid:654f82db-98ab-4c20-8cbb-89561bce6ff1&spm=a2g0o.ppclist.product.mainProduct

    Reply
  25. Tomi Engdahl says:

    Portable Digital Oscilloscope 50M Sampling Rate 10M Analogue Bandwidth Cellphone Repairs 6A Current Waveform Measurement
    https://www.aliexpress.com/item/1005005880738088.html?spm=a2g0o.detail.0.0.49c0eG98eG983i&gps-id=pcDetailTopMoreOtherSeller&scm=1007.40000.327270.0&scm_id=1007.40000.327270.0&scm-url=1007.40000.327270.0&pvid=9ace2b84-a7ff-4d58-82d1-23111fad9ac8&_t=gps-id:pcDetailTopMoreOtherSeller,scm-url:1007.40000.327270.0,pvid:9ace2b84-a7ff-4d58-82d1-23111fad9ac8,tpp_buckets:668%232846%238111%231996&pdp_npi=4%40dis%21EUR%2183.88%2133.55%21%21%2186.74%21%21%402101ec1a16957243426242158eab57%2112000034684029440%21rec%21FI%212528467667%21&search_p4p_id=202309260332226576442255757872140645_8

    Reply
  26. Tomi Engdahl says:

    https://hackaday.com/2023/09/28/fixing-a-c64-with-a-cheap-20-oscilloscope/

    Reply
  27. 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

    Reply
  28. 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

    Reply
  29. Tomi Engdahl says:

    EEVblog 1540 – The $80 Zotek ZT-702S Osciloscope Multimeter REVIEW
    https://www.youtube.com/watch?v=aUU-PGUnd0E

    Reply
  30. Tomi Engdahl says:

    EEVblog 1582 – FNIRSI DPOX180H 180MHz DPO for $123?
    https://www.youtube.com/watch?v=HR6_Lp7fH_c

    Reply
  31. Tomi Engdahl says:

    OWON HDS2202S 200 MHz 3-in-1 Handheld Oscilloscope Review/Teardown
    https://www.youtube.com/watch?v=1UaankSg1YI

    Reply
  32. Tomi Engdahl says:

    Best Digital Oscilloscope | Who Is THE Winner #1?
    https://www.youtube.com/watch?v=LsLkqwKIhGw

    Reply
  33. 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/

    Reply
  34. 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!

    Reply
  35. 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

    Reply
  36. Tomi Engdahl says:

    https://hackaday.com/2024/08/14/handheld-oscilloscope-meter-reviewed/

    Reply

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