Atek HP 8753D, User Manual, Page: 403 / 677

R ang e =
N umber of points 0 1
time span
=
201 0 1
200 2 10
03
= 1000 H er tz
F or 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 6-79 ).
That is , choose a total span of 2 kHz or less .
Figure 6-79. Range of a F orward Transform Measurement
T o increase the frequency domain measurement range , increase the span. The maximum
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 maximum range is 2 kHz on either side of the selected CW
time measurement center frequency (4 kHz total span). T o display a total frequency span of
4 kHz, enter the span as 4000 Hz.
Application and Operation Concepts 6-137