3 - 28 USING THE COMBISCOPE INSTRUMENTS
3.4.1.5 External triggering
External triggering is only possible for the PM33x0B CombiScope instruments.
Channel 4 is used as the external trigger channel with the following view
possibilities:
- attenuator positions 0.1 and 1 V/div (AMP key).
- trigger slope positive or negative (EXT TRIG key).
- trigger coupling AC or DC (AC/DC key).
The view facility of the external trigger channel is switched on by sending the
SENSe:FUNCtion:ON "XTIMe:VOLTage4" command, or by sending the
SYSTem:KEY 812 command to simulate the pressing of the TRIG VIEW key on
the front panel.
Note: The view facility of the external trigger channel can only be switched on
when:
• EXTernal or INTernal4 (CH4) is programmed as the trigger source.
• Peak detection is off.
Autoset scans for the presence of a signal on channel 1, 2, and the external
trigger input. If there is a signal present on the external trigger input, the EXTernal
trigger channel is selected as trigger source, and the external trigger view facility
becomes active.
Limitation: The amplitude of the external trigger signal must be high enough for
the sensitivity of the external trigger input (0.1 or 1 V/div.).
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