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User Manual 3155
Figure 3-37, The Trigger Panel
Slope
The Slope group lets you select the edge sensitivity for the trigger in-
put of the 3155. If you click on Positive, the instrument triggers on the
rising edge of the trigger signal. Likewise, if you click on Negative,
the instrument triggers on the falling edge of the trigger signal.
Source
The Source group Provides access to trigger source parameters.
Click on External to enable the front-panel TRIG IN connector. If you
select the external option, you must connect your stimulus signal to
the trigger input. You can also use the Manual button to trigger the
instrument when external source is selected. If you select the Internal
option, you will be replacing the external signal with an internal, free-
running, clock that is connected internally to the trigger input. The pe-
riod of the internal clock is programmable using the Timer button in
this group. If you select STAR or TTLTrg0-7, the trigger stimulus will
be supplied from the selected backplane trigger line.
Arm The Arm group is part of the Trigger Panel. Despite the fact that it
works in continuous mode only. Since the arm commands interrupt of
the 3155 output and arm control is done with the trigger input, is part
of the trigger section of WaveCAD. While modifying Arm commands,
bear in mind that the instrument must be in continuous mode only.
The arm function requires the definition of breakpoints (additional in-
formation on the arm function is given in Chapter 3 of this manual).
To turn ARM on and off, click on the State button. Select the Position
LED to program the breakpoint position. The Positive and Negative
slope options determine edge sensitivity for the trigger input.
There are two additional buttons at the right top corner of the Trigger
Panel. You can close the Trigger Panel by clicking on the Close key,
3-20 ArbConnection
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