Oscilloscope help: waveform keeps on moving

Discussion in 'General Electronics Chat' started by FullMetalEngineer, Dec 13, 2008.

  1. FullMetalEngineer

    Thread Starter New Member

    Jul 22, 2008
    4
    0
    i just bought an oscilloscope model FS-409 multichannel with a function generator at the rear

    and at first i connect the probe of my channel 1 to the other probe from the function generator... but i expect i should get a sine waveform but the waveform kept moving left to right. I can't make it steady. tried using all the controls

    what control should i vary or push just to make it steady?

    details
    http://www.globalmediapro.com/dp/A01CZ6/Pintek-FS-409-Analog-Oscilloscope-with-FG-and-Counter/
    pic
    http://media2.globalmediapro.com/av/attach/1788/fs-409big.jpg

    thanks
     
  2. bertus

    Administrator

    Apr 5, 2008
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  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Just to the left of the counter display is a switch with "Source" over it.
    Set that switch to "CH1".
    To the left of that is a switch labeled "Coupling". Set it to "Norm".
    To the left of that is a knob labeled "Trig Level". Center it (line pointing straight up).
    Above the channel 1 BNC connector is a switch with "AC", "GND" and "DC" settings. Set it to "AC". This will cause the sinewave to settle around the channel's 0V point.
    For the VERT MODE switch (between the CH1 & CH2 VOLT/DIV knobs) set it to CH1 for now (the trace for CH2 will not be displayed)
    Up and to the left is the Vertical Position knob for CH1. Center it (line pointing straight up).

    You should now have a stable sinewave displayed. You may have to change your VOLT/DIV setting for CH1.

    If it's still not stable, go back to the COUPLING switch (two left from the counter display) and select AUTO (the top setting)
     
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