Synchronizing a DSA Device with a Pulse Generation
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These examples demonstrate how to synchronize a counter output with the analog input of a DSA device using DAQmx. These programs will work with STC or TIO based counters which are found on most MIO and counter devices.
The DSA device performs continuous analog input while the counter generates a continuous pulse train.
How the synchronization works:
- The DSA device exports its sample clock to the counter.
- The counter uses the sample clock from the DSA board as a timebase for the pulse train generation.
Two examples are attached, but they both do the same thing. In one example, you can specify the frequency of the pulse train and in the other you specify the pulse train in terms of high and low ticks.
Setting the pulse train frequency directly is often more convenient, but it is possible to end up with an actual frequency which is a coerced version of the requested value. There is a boolean on the front panel of the VI which indicates whether a coercion has taken place.
Configuring the pulse train in terms of tick is a little bit lower level, but you are guaranteed that no coercions will take place.
This example will work with both PCI and PXI devices. If using PCI, you will need a RTSI cable to share the sample clock.
Filename: 202880.vi
Application Software: LabVIEW Base Development System 7.1
Language(s): LabVIEW
Hardware Group: Multifunction DAQ (MIO), Dynamic Signal Analyzers (DSA), Counter/Timers (TIO)
Hardware Model: PXI-4472B, PCI-4472, PCI-4474, PXI-4461, PXI-4462, PXI-4472
Driver: NI-DAQmx 7.3
Filename: 202879.vi
Application Software: LabVIEW Base Development System 7.1
Language(s): LabVIEW
Hardware Group: Multifunction DAQ (MIO), Counter/Timers (TIO), Dynamic Signal Analyzers (DSA)
Hardware Model: PCI-4472, PCI-4474, PXI-4461, PXI-4462, PXI-4472, PXI-4472B
Driver: NI-DAQmx 7.3
The DSA device performs continuous analog input while the counter generates a continuous pulse train.
How the synchronization works:
- The DSA device exports its sample clock to the counter.
- The counter uses the sample clock from the DSA board as a timebase for the pulse train generation.
Two examples are attached, but they both do the same thing. In one example, you can specify the frequency of the pulse train and in the other you specify the pulse train in terms of high and low ticks.
Setting the pulse train frequency directly is often more convenient, but it is possible to end up with an actual frequency which is a coerced version of the requested value. There is a boolean on the front panel of the VI which indicates whether a coercion has taken place.
Configuring the pulse train in terms of tick is a little bit lower level, but you are guaranteed that no coercions will take place.
This example will work with both PCI and PXI devices. If using PCI, you will need a RTSI cable to share the sample clock.
Requirements
Filename: 202880.vi
Software Requirements
Application Software: LabVIEW Base Development System 7.1
Language(s): LabVIEW
Hardware Requirements
Hardware Group: Multifunction DAQ (MIO), Dynamic Signal Analyzers (DSA), Counter/Timers (TIO)
Hardware Model: PXI-4472B, PCI-4472, PCI-4474, PXI-4461, PXI-4462, PXI-4472
Driver: NI-DAQmx 7.3
Software Requirements
Application Software: LabVIEW Base Development System 7.1
Language(s): LabVIEW
Hardware Requirements
Hardware Group: Multifunction DAQ (MIO), Counter/Timers (TIO), Dynamic Signal Analyzers (DSA)
Hardware Model: PCI-4472, PCI-4474, PXI-4461, PXI-4462, PXI-4472, PXI-4472B
Driver: NI-DAQmx 7.3
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