QuantAsylum QA401, Руководство пользователя

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QuantAsylum QA401 User ’s Manual
Page
45
Generators
The QA401 has two tone generators. Each tone generator has knobs so that the mouse can control the
amplitude and frequency settings. This is useful when you are interactively looking at circuit
performance and want to change values on the fly.
The generators are enabled using the Gen1 and Gen2 buttons. Each generator also has a context menu.
From the context menu, you can set a precise frequency. If you select “Round to Eliminate Leakage”,
then the frequency you select will be nudged a bit higher or lower to ensure that it sits precisely in the
center of a frequency bin. This will dramatically reduce the amount of leaking you are seeing. Generally,
the amount the frequency will be nudged will be no more than the resolution of your current FFT size
and sample rate.
When the rounding occurring, you will see the rounded frequency in the Generator display at the top of
the waveform window. In the picture below, we specified a 1 KHz waveform, enabled rounding, and the
frequency was adjusted automatically to 996.0938 Hz.