Trigger Conditions - HP 3563A Operating Manual

Trigger Conditions

The trigger conditions are level and slope, as defined by TRIG LEVEL and SLOPE +
the designated analog trigger signal (except source triggering) passes through the specified level on
the specified transition, the trigger conditions are met and the measurement triggers. The
TRIGGERING indicator LED (in the Status group) may stay on or flash, depending on the type of
trigger used (for details, see the TRIGGERING indicator description in appendix A).
Trigger level is limited to 120% of the current range setting for CHAN 1 /2 INPUT triggering, to
± lOV for EXT, and is irrelevant for FREE RUN and SOU RCE TRIG.
Phase (at time zero) is referenced to the beginning or the center of the time record depending on
the window selected, as shown in the following table.
Note
External triggering does not operate reliably on signals below
the Channel 1 or
of the current input range. If the desired external trigger signal is less than 500
mVpeak, it can be applied to either input channel, if the range is set approximately
and input channel triggering is used.
Table 7-5. When Phase is Referenced
Center of Time Record
Hann
FlatTop
User-defined windows
2 inputs, triggering is possible at levels down to
Beginning of Time Record
Uniform
Force
Exponential
500
Input Setup
Setting Up Triggering
Whenever
- .
mVpeak. With
32 dB below 2.5%
7-41