National Instruments NI 5620 用户手册
Chapter 2
Hardware Overview
© National Instruments Corporation
2-7
Figure 2-4. Multiple-Record Acquisition Timing Diagram
Triggering
You can externally trigger the NI 5620 through the digital line, PFI1. You
can also use software to trigger it. 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.
can also use software to trigger it. 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 5620 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
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
.
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