National Instruments DAQ M Series - Manual (Page 41)

Chapter 4 Analog Input
© National Instruments Corporation 4-17 NI 6236 User Manual
Figure 4-11 shows the relationship of ai/SampleClock to ai/StartTrigger.
Figure 4-11. ai/SampleClock and ai/StartTrigger
AI Sample Clock Timebase Signal
You can route any of the following signals to be the AI Sample Clock
Timebase (ai/SampleClockTimebase) signal:
• 20 MHz Timebase
• 100 kHz Timebase
• PXI_CLK10
• RTSI <0..7>
• Input PFI <0..5>
• PXI_STAR
ai/SampleClockTimebase is not available as an output on the I/O connector.
ai/SampleClockTimebase is divided down to provide one of the possible
sources for ai/SampleClock. You can configure the polarity selection for
ai/SampleClockTimebase as either rising or falling edge.
AI Convert Clock Signal
Use the AI Convert Clock (ai/ConvertClock) signal to initiate a single A/D
conversion on a single channel. A sample, controlled by the AI Sample
Clock, consists of one or more conversions.
You can specify either an internal or external signal as the source of
ai/ConvertClock. You also can specify whether the measurement sample
begins on the rising edge or falling edge of ai/ConvertClock.
ai/SampleClockTimebase
ai/StartTrigger
ai/SampleClock
Delay
From
Start
Trigger