PPA5xx/15xx user manual
14-2
The data source for the trigger can be selected to be either
voltage or current. On a mutiphase instrument, any of the
phases may be selected for the trigger source. The trigger
options are found in the Scope menu. There are two
trigger reference options. The first option allows the user
to select the voltage or current and the second option
allows the selection of the Phase to be used to trigger the
waveforms.
Note: The frequency reference options in the ACQU menus
are not used for the triggering in Scope mode.
The trigger level is set directly in Volts or Amps and does
not change if the range is changed, i.e. it is an absolute
trigger level and not relative to the range full scale.
Pressing NEXT and ENTER adjust the trigger level by a
factor of 2.
The trigger level is shown as a small horizontal bar on the
extreme left-hand edge of the display against the
appropriate channel. If the trigger is set to a value above
or below the range of the input channel then a small carat
^ is shown at the top or inverted at the bottom of the
display as appropriate.
The trigger type may be set to:
auto (trigger if possible but do not wait)
normal (wait indefinitely for trigger)
single shot (wait for trigger then hold)
The single shot option is reset using the TRIGGER key.
The trigger polarity may be set to rising edge or falling
edge.
When ‘trigger HF reject’ is on, a low pass filter is applied to
the trigger data to stabilise the trace with noisy signals.
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