Synchronizing a DSA Device with a MIO Device Using Different Sampling Rates
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This example shows how to perform a continuous acquisition on DSA and MIO devices which are synchronized and sampling at different rates using DAQmx.
How the synchronization works:
- The oversample clock from the DSA device is exported over the PXI Star trigger line to the MIO device.
- The MIO device uses this oversample clock as a timebase for its own sampling rate.
When choosing sample rates and block sizes for this example, try to keep the amount of time it takes to acquire data from each device very similar. For example, if you want to sample at 20kS/s on the DSA board and at 80kS/s on the MIO board, make sure that the block size used for the MIO board is 4x the size of the DSA block size. This will help to guarantee that your program does not experience FIFO overflows.
The DSA device must be the master device and must be in slot 2 of a PXI chassis. This example will not run as is on PCI devices.
Filename: 202878.vi
Application Software: LabVIEW Base Development System 7.1
Language(s): LabVIEW
Hardware Group: Multifunction DAQ (MIO), Dynamic Signal Analyzers (DSA)
Hardware Model: PXI-4461, PXI-4472B, PXI-4472, PXI-4462
Driver: NI-DAQmx 7.3
How the synchronization works:
- The oversample clock from the DSA device is exported over the PXI Star trigger line to the MIO device.
- The MIO device uses this oversample clock as a timebase for its own sampling rate.
When choosing sample rates and block sizes for this example, try to keep the amount of time it takes to acquire data from each device very similar. For example, if you want to sample at 20kS/s on the DSA board and at 80kS/s on the MIO board, make sure that the block size used for the MIO board is 4x the size of the DSA block size. This will help to guarantee that your program does not experience FIFO overflows.
The DSA device must be the master device and must be in slot 2 of a PXI chassis. This example will not run as is on PCI devices.
Requirements
Filename: 202878.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)
Hardware Model: PXI-4461, PXI-4472B, PXI-4472, PXI-4462
Driver: NI-DAQmx 7.3
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