National Instruments DAQ X Series User Manual

Chapter 4 Analog Input
© National Instruments 4-27 X Series User Manual
If an AI Reference Trigger (ai/ReferenceTrigger) pulse occurs before the
specified number of pretrigger samples are acquired, the trigger pulse is
ignored. Otherwise, when the AI Reference Trigger pulse occurs, the
sample counter value decrements until the specified number of posttrigger
samples have been acquired.
MIO X Series devices feature the following analog input timing signals:
• AI Sample Clock Signal
*
• AI Sample Clock Timebase Signal
• AI Convert Clock Signal
*
• AI Convert Clock Timebase Signal
• AI Hold Complete Event Signal
• AI Start Trigger Signal
*
• AI Reference Trigger Signal
*
• AI Pause Trigger Signal
*
Signals with an
*
support digital filtering. Refer to the PFI Filters section
of Chapter 8, PFI, for more information.
Aggregate versus Single Channel Sample Rates
MIO X Series devices are characterized with maximum single channel and
maximum aggregate sample rates. The maximum single channel rate is the
fastest you can acquire data on the device from a single channel and still
achieve accurate results. The maximum aggregate sample rate is the fastest
you can acquire on multiple channels and still achieve accurate results. For
example, NI 6351 devices have a single channel maximum rate of
1.25 MS/s and aggregate maximum sample rate of 1 MS/s so they can
sample one channel at 1.25 MS/s or two channels at 500 kS/s per channel,
as shown in Table 4-4.
Table 4-4. Analog Input Rates for MIO X Series Devices
MIO X Series Device
Analog Input Rate
Single Channel
Multi-Channel
(Aggregate)
NI 632x 250 kS/s 250 kS/s
NI 634x 500 kS/s 500 kS/s
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National Instruments DAQ X Series Specifications

General

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