Chapter2 HardwareOverview
©NationalInstruments Corporation 2-7 NIPXI-562x User Manual
Figure 2-4 showsa timi ng diagram of a multiple-record acquisition.
Figure2-4. Multiple-RecordAcquisition Timing Diagram

Triggering

You can externally trigger the NI 562xthrough the digital line, PFI1.
You can also usesoftware to trigger the NI 562x. Figure 2 -5 shows the
differenttrigger sources. The digital triggers are TTL-level signals with
am inimum pulse-width requirement of 100 ns or 16 ns times the DDC
decimation.
Figure2-5. DigitalTrigger Sources
Calibration
Although the NI 562xis factory calibrated, it needs periodic calibration to
verifythat it is still within the specified accuracy. For more information o n
calibration, contact NI or visit the NI Web site at
ni.com/support/calibrat.
Trigger
Acquisition
InProgress
Buffer
=Trigger Not Accepted (Pretrigger Points Not Acquired)
=Trigger Not Accepted (500 ns Dead Time)
=Trigger Not Accepted (Acquisition in Progress)
=Trigger Accepted
12
1
1 2 3
2
3
500ns
Trigger
Software
RTSI<0..7>
PFI1
8
PXIStar