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Chapter 2 Analog Input

Using an Analog Source

When you use an analog trigger source, the internal sample clock pauses

when the Analog Comparison Event signal is low and resumes when the

signal goes high (or vice versa). Refer to Chapter 10,

Triggering, for more

information on analog triggering.

Note Pause triggers are only sensitive to the level of the source, not the edge.

AI Sample Clock Signal

You can use the AI Sample Clock (ai/SampleClock) signal to initiate a set

of measurements. Your E Series device samples the AI signals of every

channel in the scan list once for every ai/SampleClock. A measurement

acquisition consists of one or more samples.

The source of the ai/SampleClock signal can be internal or external. You

specify whether the measurement sample begins on the rising edge or

falling edge of the ai/SampleClock signal.

Using an Internal Source

By default, ai/SampleClock is created internally by dividing down the

ai/SampleClockTimebase. Refer to the

AI Sample Clock Timebase Signal

section for more information.

Several other internal signals can be routed to the sample clock. Refer to

Device Routing in MAX in the NI-DAQmx Help or the LabVIEW 8.x Help

for more information.

Using an External Source

You can use a signal connected to any PFI or RTSI <0..6> pin as the source

of ai/SampleClock. Figure 2-24 shows the timing requirements of the

ai/SampleClock source.

National Instruments PCI-6035E User Manual

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