Aggregate Versus Single Channel Sample Rates; Ai Sample Clock Signal; Analog Input Rates For Ni Pxie-4300 Modules - National Instruments SC Express NI PXIe-4300 User Manual

NI PXIe-4300 modules feature 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

Aggregate versus Single Channel Sample Rates

NI PXIe-4300 modules have one ADC per channel so the single channel maximum sample
rate can be achieved on each channel. The maximum single channel rate is the fastest you can
acquire data on the device from a single or multiple channels and still achieve accurate results.
The total aggregate determines the maximum bus bandwidth used by the device. The total
aggregate sample rate is the product of the maximum sample rate for a single channel
multiplied by the number of AI channels that the device support.
Table 2-4 shows the single channels and total aggregate rates for NI PXIe-4300 modules.
AI Sample Clock Signal
Use the AI Sample Clock (ai/SampleClock) signal to initiate a set of measurements. Your
NI PXIe-4300 module samples the AI signals of every channel in the task once for every
AI Sample Clock. A measurement acquisition consists of one or more samples.
You can specify an internal or external source for AI Sample Clock. You also can specify
whether the measurement sample begins on the rising edge or falling edge of AI Sample
Clock.
© National Instruments Corporation
Table 2-4. Analog Input Rates for NI PXIe-4300 Modules
Analog Input Rate
Single Channel
250 kS/s
Total Aggregate
2-11
Chapter 2 Using the NI PXIe-4300
2 MS/s
NI PXIe-4300 User Manual