National Instruments NI PXI-562X - Manual (Page 21)

Chapter 2 Hardware Overview
© National Instruments Corporation 2-7 NI PXI-562x User Manual
Figure 2-4 shows a timing diagram of a multiple-record acquisition.
Figure 2-4. Multiple-Record Acquisition Timing Diagram
Triggering
You can externally trigger the NI 562x through the digital line, PFI1.
You can also use software to trigger the NI 562x. Figure 2-5 shows the
different trigger sources. The digital triggers are TTL-level signals with
a minimum pulse-width requirement of 100 ns or 16 ns times the DDC
decimation.
Figure 2-5. Digital Trigger Sources
Calibration
Although the NI 562x is factory calibrated, it needs periodic calibration to
verify that it is still within the specified accuracy. For more information on
calibration, contact NI or visit the NI Web site at
ni.com/support/calibrat .
Trigger
Acquisition
In Progress
Buffer
= Trigger Not Accepted (Pretrigger Points Not Acquired)
= Trigger Not Accepted (500 ns Dead Time)
= Trigger Not Accepted (Acquisition in Progress)
= Trigger Accepted
1 2
1
1 2 3
2
3
500 ns
Trigger
Software
RTSI <0..7>
PFI1
8
PXI Star