HP 8642A - Page 117

Operation
Model 8642A/B
Amplitude Sweep (cont'd)
Example for Calculation #4
Set an amplitude sweep from -1 0 to +10 dBm with a sweep step size of 0.8 dB.
Calculate the required sweep time setting for a 0.8 dB step size using calculation #4:
Ensure that an integer results when the amplitude span (of 20 dB) is divided by the
step size of 0.8 dB.
20 dB
0.8 dB
= 25
Minimum step size is equal to 0.1 dB.
Maximum step size is equal to the maximum of:
0.1 dB
or
|-10 dBm - 10 dBm\
= 4 dB
Since 4 dB is greater than 0.1 dB, the maximum step size is 4 dB.
Therefore, it should be possible to select a 0.8 dB step size since that value is between
the minimum value (0.1 dB) and maximum value (4 dB).
To obtain a step size of 0.8 dB, you can set the sweep time between the results of the
following calculations:
|-10 dBm - 10 dBm\
0.8 dB
|-10 dBm - 10 dBm\
0.8 dB
+ 1
+ 2
X 3 ms = 78 ms
X 3 ms = 81 ms
LOCAL
(keys)
SWEEP
SWEEP
SWEEP
DATA
Qmcn
SWEEP
SWEEP
DATA
X) X] r^
DATA
XJX
(program
codes)
AASA ST 80 MS AA -10 DM AB 10 DM
3-90