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Homework Help: Oscilloscope modes

  1. Dec 29, 2008 #1
    I don't know if this the right forum to post this question but i cant figure out which forum i should use:confused:
    here is my question
    What are the modes in Oscilloscope?
    i did google search but couldn't find clear answer for my question.
  2. jcsd
  3. Dec 29, 2008 #2
    What do you mean?
    You mean trigger modes? there are many modes!! Please be more specific.
  4. Dec 29, 2008 #3
    i'm not sure question i was given is
    "what are the modes of operation of an oscilloscope(explain each mode) and what is meant by dual trace oscilloscope and its modes of operation"
  5. Dec 29, 2008 #4


    User Avatar

    Staff: Mentor

    That's a pretty lame question, IMO (in my opinion). Sounds like the prof or TA was feeling kind of lazy when they assigned that problem. Sigh.

    Well, to try to answer the question prima facia, start with the databook/datasheet for a modern oscilloscope, and talk about the different ways to use the x and y axes for display modes. The older scopes would only let you plot V(t), or some x-y mixed mode (what kinds?), but the newer models allow more mixed Logic Analyzer / Oscilloscope displays too.

    I sure hope your prof gets a bit more inspired in his/her questions going forward in this class....
  6. Dec 29, 2008 #5
    Your professor ever been an engineer? This and the opamp question is sure different!!!

    the mode is endless, If I tell you I know all of them, I am lying!!! Even a 15year old scope have disk drive for wave form storage, pattern trigger, event trigger and so on and so on and.....

    I don't mean to be difficult, I don' even know whether to start!! Sorry!!
  7. Dec 29, 2008 #6
    well can someone explan what are the most basic modes
  8. Dec 29, 2008 #7
    To get the scope going. First you have to correct voltage scale.

    1) Choose the trigger mode. eg. +ve edge trigger, or -ve edge trigger. This got to be the most basic mode.
    2) Then you have to auto trigger mode which the scope trace continuously. or normal trigger where the scope will sit and wait for the trigger.
    3) You have one shot mode that you want to capture the signal one time only so you can look at it before you reset the scope for another trigger.

    This is the most classic old style analog scope can do.

    4) then you have the event trigger where you use multi channel. You set a pattern of signal you want the scope to capture when that pattern happened. Just like a logic analyzer.

    These are some of the most basic modes. I have not use any scope less than 10 years old, so someone might give you more insight. I have a Tektronix 465 old old scope where people practically gave away, good enough for working on guitar amplifiers.

    You have access to a scope in school? Have some one show you for 10 minutes and you learn more modes than anyone can describe to you.
  9. Dec 29, 2008 #8
    thanks i have used dual trace scope several time and i have anothe question

    "if the output voltage is given by Vo=Vcc(1+e-t/RC),determine the rise time of the voltage pulse given by 2.2RC"

    here how i solved it

    at t=2.2RC assuming charging is 100%
    Vmax=Vcc(1-e-2.2RC/RC) = Vcc(1-e-2.2)

    at t=t10 Vo=10%*Vmax



    at t=t90 Vo=90%*Vmax



    rise time = t90-t10
    = (1.6108-0.09312)RC
    = 1.51768RC

    is my method of finding rise time is correct?
  10. Dec 30, 2008 #9
    Please clarify.
  11. Dec 30, 2008 #10
    what do you mean by clarify?
    its about Rise time of a oscilloscope
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