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Appendix B
Press the [Filter Slope] key once to increase the
filter slope to 12 dB/oct.
The FFT Display
constant acts like a bandpass filter in the
spectrum centered at f
ref
The peak amplitude at 99.000 kHz is
diminished even further. This is the effect of the
steeper time constant filter.
At the lock-in output, the 1 kHz output is
attenuated further by this filter.
This example has provided a quick overview of
the FFT display in the SR865A.
SR865A DSP Lock-in Amplifier
167
(center).
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