Digital oscilloscope intensity graduation and calibration

Discussion in 'General Electronics Chat' started by Kenny, Apr 5, 2010.

  1. Kenny

    Thread Starter AAC Fanatic!

    Oct 11, 2004
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    Seems that I'm gonna have my first oscilloscope.
    I have taken into account the bunch of advice given for the selection.
    And I come with 2 candidates, restricted for my budget U$300-U$400:
    1) Digital Owon PDS5022 25MHz
    http://www.owon.com.cn/eng/pds.asp
    2) Analogue BKPrecision BK2120B 30MHz
    http://www.bkprecision.com/products...al-trace-analog-oscilloscope-with-probes.html
    I have general knowledge, with many gaps, about everything on electronics, but I wanna learn the inners of electronics, in order to design circuits.

    Following the advice of Kuphaldt books and Horowitz Art of Electronics, among other sources, I want to hook my oscilloscope to any possible signal, from simple AC voltage dividers to DC microprocessor circuits, passing by transistors amplifiers, opamps, discrete digital, audio/video signals, troubleshooting tv/radio/cd, etc.

    And I'm here with 2 doubts:
    - How much important is the display intensity graduation difference on my 2 candidates, when viewing tv/video signals, CDROM signals, other complex signals?
    - How much time an oscilloscope takes to be in need of a specialized calibration, and is the same on both models?

    Thanks in advance.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    For all around usage, an analog o'scope is preferable. DSO's are a bit trickier to set up, as an unoptimum sampling rate can lead to an aliased presentation (see link - http://shalin.wordpress.com/tag/nyquist-sampling/).

    I can't quite get what your concern is about display intensity.

    Unless you are planning on some really hairy measurements, o'scope calibration is probably not going to be a concern. You use a meter for accurate voltage measurement, and you can always get a frequency counter for that function.
     
  3. Kenny

    Thread Starter AAC Fanatic!

    Oct 11, 2004
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    0
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    The truism is that no o'scope can do it all. I am probably biased towards analog instruments, as those were the first ones I used (and am still using). For low bandwidth, I would still say analog, despite my obvious bias. Above 250 MHz, digital is probably better.
     
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