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Appendix C Using the Digital Port
Trigger Output
204
To input an external trigger signal, you can apply either a negative-
going or a positive-going pulse to the designated trigger input pin.
The trigger latency is 5 microseconds. The minimum pulse width is 2
microseconds. The pin's polarity setting determines which edge
generates a trigger-in event. Positive means a rising edge and
Negative means a falling edge.
You can configure the scope, the data logger, and the arbitrary
waveform generator to be triggered by external trigger signals.
Simply select BNC Trigger In as the trigger source when configuring
the scope, data logger, or arbitrary waveform generator (see chapters
3 and 4). This will enable input trigger signals on the configured
digital pins as well as on the BNC trigger input connector. A trigger is
generated when an external signal that meets the signal criteria is
applied to any configured trigger input pin or to the BNC connector.
From the front panel:
To configure the trigger input function, press the Menu key, scroll
down and select the Utilities item, then select Digital I/O. Then
press Enter. The Digital I/O window will appear as previously shown
under "Bi-directional Digital I/O".
Select the pin you wish to configure from the Pin dropdown list.
Select the Trigger In function for the pin the from the Function
dropdown list.
Configure the polarity for the pin by selecting the Polarity dropdown
menu. Select either Positive or Negative.
From the remote interface:
To configure the Trigger In function for the selected pin:
DIG:PIN<1-7>:FUNC TINP
To configure the pin polarity to positive for the selected pin:
DIG:PIN<1-7>:POL POS
Any of the Digital Control pins can be programmed to function as a
trigger output. All pins are referenced to the Signal Common pin.
When configured as a trigger output, the designated trigger pin will
generate a 10-microsecond trigger pulse in response to a trigger
event. The polarity setting can be either positive-going (rising edge)
or negative-going (falling edge) when referenced to common.
Trigger out signals can be generated when configuring User-defined
voltage or current arbitrary waveforms. If you check the Trigger box
when configuring the User-defined arbitrary waveform (see chapter
3), an output trigger signal will be generated on the configured digital
pin as well as on the BNC trigger output connector at the start of the
voltage or current step.
Model N6705 User's Guide
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