National Instruments DAQ X Series User Manual

Chapter 11 Triggering
X Series User Manual 11-4 ni.com
Analog Input Channels on MIO X Series Devices
Select any analog input channel to drive the NI-PGIA. The NI-PGIA
amplifies the signal as determined by the input ground-reference setting
and the input range. The output of the NI-PGIA then drives the analog
trigger detection circuit. By using the NI-PGIA, you can trigger on very
small voltage changes in the input signal.
When the DAQ device is waiting for an analog trigger with a AI channel as
the source, the AI muxes should not route different AI channels to the
NI-PGIA. If a different channel is routed to the NI-PGIA, the trigger
condition on the desired channel could be missed. The other channels also
could generate false triggers.
This behavior places some restrictions on using AI channels as trigger
sources. When you use an analog start trigger, the trigger channel must be
the first channel in the channel list. When you use an analog reference or
pause trigger, and the analog channel is the source of the trigger, there can
be only one channel in the channel list.
Analog Input Channels on Simultaneous MIO
X Series Devices
With Simultaneous MIO X Series devices, every AI channel drives its own
NI-PGIA. The NI-PGIA amplifies the signal as determined by the input
range. The output of the NI-PGIA then drives the analog trigger detection
circuit. By using the NI-PGIA, you can trigger on very small voltage
changes in the input signal.
Since channels are not multiplexed, there are no restrictions on the analog
input channel list order or number of channels with reference and pause
triggers. However, the analog input channels must be in the scan list.
Analog Trigger Actions
The output of the analog trigger detection circuit is the Analog Comparison
Event signal. You can program your DAQ device to perform an action in
response to the Analog Comparison Event signal. The action can affect the
following:
• Analog input acquisition
• Analog output generation
• Digital input behavior
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National Instruments DAQ X Series Specifications

General

Brand	National Instruments
Model	DAQ X Series
Category	I/O Systems
Language	English