National Instruments NI CompactDAQ 9184 User Manual

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Chapter 2 Analog Input
Analog Input Timing Signals
The cDAQ chassis features the following analog input timing signals:
• AI Sample Clock Signal*
• AI Sample Clock Timebase 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 4, Digital
Input/Output and PFI, for more information.
Refer to the AI Convert Clock Signal Behavior For Analog Input Modules section for AI Convert
Clock signals and the cDAQ chassis.
AI Sample Clock Signal
A sample consists of one reading from each channel in the AI task. Sample Clock signals the
start of a sample of all analog input channels in the task. Sample Clock can be generated from
external or internal sources as shown in Figure 2-1.
Figure 2-1. AI Sample Clock Timing Options
Routing the Sample Clock to an Output Terminal
You can route Sample Clock to any output PFI terminal. Sample Clock is an active high pulse
by default.
AI Sample Clock Timebase Signal
The AI Sample Clock Timebase signal is divided down to provide a source for Sample Clock.
AI Sample Clock Timebase can be generated from external or internal sources. AI Sample Clock
Timebase is not available as an output from the chassis.
Programmable
Clock
Divider
AI Sample Clock
Timebase
PFI
Analog Comparison Event
Ctr n Internal Output
AI Sample Clock
Sigma-Delta Module Internal Output
Analog Comparison
Event
20 MHz Timebase
80 MHz Timebase
PFI
100 kHz Timebase

National Instruments NI CompactDAQ 9184 Specifications

General

Brand	National Instruments
Model	NI CompactDAQ 9184
Category	Chassis
Language	English