User`s guide

Chirp
5-64
on page 5-62). The following table describes the characteristics of
unidirectional and bidirectional sweeps.
The following diagram illustrates a linear sweep in both sweep modes. For
information on setting the frequency values in your sweep, see “Setting
Instantaneous Frequency Sweep Values”.
Setting Instantaneous Frequency Sweep Values
Set the following parameters to tune the frequency values of your output
frequency sweep:
•
Initial frequency (Hertz), f
0
Sweep mode
Parameter
Settings
Sweep Characteristics
Unidirectional
•Lasts for one Sweep time, T
sw
•Repeats once every T
sw
Bidirectional
•Lasts for twice the Sweep time, 2
*
T
sw
•Repeats once every 2
*
T
sw
•First half is identical to its unidirectional counterpart.
•Second half is a mirror image of the first half.
0
f
i
(t)
f
0
T
sw
...
Unidirectional Linear Sweep
0
f
i
(t)
f
0
...
Bidirectional Linear Sweep
f
i
(t
g
)
t
g
f
i
(t
g
)
2T
sw
t
g
T
sw
2T
sw
3T
sw
4T
sw
time
time
Lasts for 2
*
T
sw
Lasts for T
sw
Repeats every T
sw
Repeats every 2
*
T
sw
Second half is mirror image of first half.
First half is identical to its unidirectional counterpart.