Oscilloscope

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Oscilloscope
2
Sweep generator
3
Sweep
TIME/DIV
t
4
Trigger Fault
5
Trigger Fault
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Trigger generation
Trigger
Sawtooth
7
Positive trigger level
Trigger
Sawtooth
8
Negative trigger level
Trigger
Sawtooth
9
Part of the signal less than one period
Trigger
Hold-on time
Sawtooth
10
Part of the signal more than one period
Trigger
Sawtooth
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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)

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X-Y mode
Y
Vy A sin(?? t) Vx A sin (?? t?)
X