Triggering the CRO Trace

What Do We Mean By Triggering?

• Well when an signal is applied to the input of the CRO we require a mechanism that tells the CRO to trace the input signal on the display. This mechanism is called the CRO Triggering Circuit.
• Essentially when the trace circuit is activated two steps occur:
  1. The input signal is fed through the trace causing it to "trace" the input signal on the display.
     
  2. When trace runs to the edge of the display it then "traces" the signal on the display again.
• The second step above is repeated over and over again and it is most important that the trace begins in exactly the same place on the input signal as before because if it does not we will not get a useful reading on the display.
• Below is a digram of part of the CRO control panel showing the Trigger Controls on the right side of the Time Base Control.

Adjusting the Triggering Controls

• The trigger circuit of the CRO can be adjusted using the four controls listed below:

  Trigger Signal Source Selector. Level Adjustment Control Slope Adjustment Control Sync Mode Selector

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Revised: Friday, 17 July 1998