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Oscilloscope

VIEWS: 12 PAGES: 13

  • pg 1
									Oscilloscope
Sweep generator
Sweep   TIME/DIV


                   t
Trigger Fault
Trigger Fault
           Trigger generation


Trigger




Sawtooth
           Positive trigger level

Trigger




Sawtooth
           Negative trigger level

Trigger




Sawtooth
           Part of the signal: less than one period

Trigger




                    Hold-on time
Sawtooth
           Part of the signal: more than one period

Trigger




Sawtooth
         Dual Trace oscilloscope
• Use a single-beam (one electron gun) .
• Time-multiplex the inputs.
  – Chop mode or Alternate mode.
• Chopped mode: during the same sweep
  period, alternate between the two input
  signals. (better for slow sweep, i.e. high
  period)
• Alternate mode: one sweep period for each
  signal. ( better for fast sweep, i.e. low period)
X-Y mode             Y



Vy =A sin(���� t)
Vx =A sin (���� t+θ)




                         X

								
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