Signal Acquisition and Regeneration Example
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Filename: ack-gen-ex.zip
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This example is based on three other National Instruments example programs. The NI-SCOPE EX Configured Acquisition.vi example that is included with NI-SCOPE, the NI-FGEN Arbitrary Waveform Example.vi example that is included with NI-FGEN, and the Interpolation Solver.vi example that is include with NI LabVIEW 6.0.
The purpose of the example is to show how to acquire a signal using the NI 5112 High Speed Digitizer sampling at 100 MHz and how to generate a simulation of this acquired signal with the NI 5411 Arbitrary Waveform Generator at 40 MHz. The difference in acquisition/sampling rates requires that the signal be both interpolated and decimated in order for the final output signal to appear as the acquired signal. To do this, the Interpolation Solver.vi example was modified to accept very large waveforms and interpolate for samples that correspond to the timing of the NI 5411.
Another feature of the NI 5411 and the NI 5112 is that they are synchronized so that the clocks are running in step by being phase locked looped (PLL) together. Without phase locked looping the boards together, the NI 5112 would acquire at it's clock’s rate, and the NI 5411 will generate a signal with the update rate at another rate. If the clocks are slightly off, even though both cards are within specification, the waveform’s timing may be slightly off. For example, if the NI 5112 samples at a 99 KHz rate and the NI 5411 updates at 101 KHz rate, the waveforms that are output have lengthened in time by about 2 KHz. The actual clock times of the devices in specification are much smaller, but if the best clock time is required, PLL helps immensely.
There are also options to save the acquired waveforms as a datalog file, open the file later, and generate the acquired data.
Requirements
Filename: ack-gen-ex.zip
Software Requirements
Application Software: LabVIEW Full Development System 6.0
Language(s): LabVIEW
Hardware Requirements
Hardware Group: High-Speed Digitizers (Scopes), Signal Source (AWG/FG/AO)
Driver: NI-SCOPE 2.0, NI-FGEN 1.5
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