Agilent Technologies 8753ET User Manual page 194

Making Time Domain Measurements
Transforming CW Time Measurements Into the Frequency Domain
Figure 3-19 Separating the Amplitude and Phase Components of
Test-Device-Induced Modulation
Forward Transform Range
In the forward transform (from CW time to the frequency domain), range is defined as the
frequency span that can be displayed before aliasing occurs, and is similar to range as
defined for time domain measurements. In the range formula, substitute time span for
frequency span.
Number of points
Range = --------------------------------------------------------------
time span
201 1 –
Range = ------------------------- -
3 –
×
200 10
Range =
1000 Hertz
For the example, a 201 point CW time measurement made over a 200 ms time span, choose
a span of 1 kHz or less on either side of the center frequency (see
choose a total span of 2 kHz or less.
3-24
– 1
Figure 3-20). That is,