DSO138, Not Even Once

Before you buy a DSO138 or DSO150 from ebay, amazon, wish or aliexpress, it is important to understand what you are getting. The specifications are very loosely written and what looks good on paper is useless in practical use. Here I test the DSO138 specified at 200 kHz, but in reality it is worthless above 20 kHz.

Buying the right oscilloscope is knowing your work area limits and where it might be in the future. I recommend that you read: 12 things to consider when choosing an oscilloscope: https://www.mouser.com/pdfdocs/Tektronix12_things_to_consider1.pdf

For the Nyquist applet to play with: http://195.134.76.37/applets/AppletNyquist/Appl_Nyquist2.html

Mads Barnkob

Electrician, programmer, experimenter and amateur scientist with experience in industry automation, programming and all kinds of high voltage generating electronics. Administrator of www.kaizerpowerelectronics.dk and the high voltage community forum www.highvoltageforum.net

View all posts by Mads Barnkob →

2 thoughts on “DSO138, Not Even Once

  1. Hello
    The BW testing should be done with a compensated probe, adjusted to the specific input capacitance or with a 50 Ohm termination on the input BNC. If not the capacitance of the leads are causing the signal distortion.

  2. Hi Eyal Hemed

    Are you seriously telling me that the performance you see here is due to lack of a compensated probe, which is not supplied with the kit, and has nothing to do with a inadequate ADC in the front end?

    Kind regards
    Mads

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