Tektronix 2247A

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Basic Applications
Setting Trigger Level
The trigger level readout supplied by the TRACK TRIG LVL cursor may be
used to set a specific trigger level for triggering on a displayed waveform.
As an example, assume the following conditions:
a. The signal to be examined is a mix of two different signal levels (see
Figure 5-8).
b. It is necessary to trigger on the larger amplitude signals to make a
closer examination of their waveshape and take pulse width and/or
rise time measurements.
To set the Trigger LEVEL to the appropriate level with no signal applied (or
with GND input coupling) use the TRACK th cursor feature. (The TRACK th
cursor menu choice is reached through the same menu path as the TRACK
TRIG LVL cursor.) The ground cursor provides feedback to the user so that
the
ground level may be positioned without the need for a ground baseline
trace.
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DC SYMBOL
6556-34
Figure 5-8. Setting a specific trigger level.
2247A Operators 5-21