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Figure 8: WaveVision 5 main window command buttons
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Sampling Rate
- When the signal source panel is selected, the clock frequency is displayed. This is
initially the internal clock. In this example, 1500 MHz is generated by the LMX2541 on the reference
board. The sampling rate is determined by the FPGA when the board is powered up.
The calculation is
accurate to better than 1%. If an external source is in use, confirm that this number corresponds to the
clock reference that is applied. If it is not correct, subsequent data captures and display will not be correct.
•
Resolution
– This will always be set to the ADC0XD1520 resolution which is 8 bits.
•
Acquisition Size
- This setting displays and selects the number of samples captured in each acquisition.
4K samples is the default, with settings up to 32K samples. A larger sample size increases the equivalent
FFT bandwidth resolution, but at the expense of more memory and slower acquisition time.
•
Data Format
- The default data format is
offset binary
for the ADC0XD1520.
•
FFT buffers to average
- The last option is the FFT averaging function. Using this feature, subsequent
samples can be averaged to obtain improved signal to noise. However, this is at the expense of time.
