HP 8753D - Page 404

R
ang
e
=
Number
of points
0 1
time
span
=
201 0
1
200
2 10
0
3
=
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