QuantAsylum QA401, Руководство пользователя, Страница: 44 / 70

QuantAsylum QA401 User ’s Manual
Page
44
Zooming in a bit more, we can see the response at 20 Hz is roughly 0.05 dB and the response at 20 KHz
is roughly down 0.1 dB, both relative to 1 KHz.
Similar procedures can be followed for the white noise stimulus. The white noise stimulus can be a bit
noisy, and is best used with heavy averaging
— both large FFT sizes and signal averaging. As discussed
above, the impulse measurements are most helpful when characterizing circuits wired directly to the
QA401. The white noise might be more useful when playing the stimulus through a speaker and
capturing it with a microphone.
All of the chirp stimuli are considered experimental at this point. The way these would be used now
would be to capture the input waveforms using an external application and then using the external
application to process the captured waveform.