Forward Transform Range - HP 8753E User Manual

Forward transform range. In the forward transform (from CW time to the frequency domain),
range is delIned as the frequency span that can be displayed before aiiasing occurs, and is
time span for frequency span.
Example:
For the example given above, 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 Figure 6-80).
That is, choose a total span of 2 kHz or less.
Figure 6-80. Range of a Forward Transform Measurement
range is inversely proportional to the sweep time, therefore it may be necessary to increase
the number of points or decrease the sweep time. Because increasing the number of points
increases the auto sweep time, the maximm range is 2 kHz on either side of the selected CW
time measurement center frequency (4 kHz total span). lb display a total frequency span of
4 kHz, enter the span as 4000 Hz.
Number of points -
Range =
time span
= 200 x 10-S
= 1000
Hertz
1
Application and Operation Concepts