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SR1 Operation 279
© 2014 Stanford Research Systems
2.9.1 Analog-Analog
The Analog-Analog selection lists basic Audio Analyzer measurements in the analog domain. All the
Analog-analog setups default the A and B input channels to the BNC inputs, DC coupled, autoranged.
What you'll need to configure for all these setups:
Change the analog input connector and coupling settings on page 1 to match the type of equipment
you're using,
28 kHz FFT
This setup configures SR1 for a basic audio band FFT. The Hi-resolution converter is selected for
maximum dynamic range. The A0 analyzer is configured as a dual channel FFT analyzer with a span of
28.8 kHz and continuous averaging.. The Analog Generator is loaded with a low-distortion sine waveform
set to a default frequency of 1 kHz and an amplitude of 1 Vrms. Page2 contains a graph displaying the A
and B channel power spectra while Page 3 contains a graph displaying the A and B channel time
records.
What you'll need to configure:
If your'e using the analog generator, adjust the amplitude and frequency of the signal to match your
requirements. Otherwise you can turn the analog generator off. The amount of
averaging in the FFT
analyzer can be adjusted to suit the noise level of your signal. The FFT resolution is defaulted to 4k
points, this can be adjusted.
Frequency Response
This setup configures SR1 for a stereo audio-band frequency response sweep. The Hi-resolution
converter is selected for maximum dynamic range. The Time Domain Detector is selected for the A0
analyzer. The Analog Generator is loaded with a sine waveform. Page2 contains a graph displaying the
A and B channel frequency response. The sweep controller is programmed to sweep the sine frequency
from 20 Hz to 20 kHz in 22 logarithmic steps.
What you'll need to configure:
Adjust the the sine amplitude to match the equipment being tested. The number of points in the sweep
can be changed to give faster sweeps or higher resolution sweeps. The
settling parameters can be
adjusted to fit the noise levels of the signals being measured.
Wideband FFT
This setup is similar to the audio-band FFT setup described above except that the FFT frequency range
is set to the maximum 200 kHz value. The A0 analyzer is configured as a dual channel FFT analyzer
with a span of 28.8 kHz and continuous averaging.. The Analog Generator is loaded with a low-distortion
sine waveform set to a default frequency of 1 kHz and an amplitude of 1 Vrms. Page2 contains a graph
displaying the A and B channel power spectra while Page 3 contains a graph displaying the A and B
channel time records.
What you'll need to configure:
If your'e using the analog generator, adjust the amplitude and frequency of the signal to match your
requirements. Otherwise you can turn the analog generator off. The amount of
averaging in the FFT
analyzer can be adjusted to suit the noise level of your signal. The FFT resolution is defaulted to 4k
points, this can be adjusted.