HP 8642A Operation And Calibration Manual page 125

Model 8642A/B
Operation
Amplitude Sweep (cont'd)
Example for Calculation #3 (cont'd)
Display
CRunCH rRJlnru
L ' U I f L rl
mmmmmmm
T r - " ,
III I. I III III III III III
• ..L
0
ILl
The display shows that the amplitude values are possible and are currently being set.
I ' " ' " '" f7I f7I f7I f7I f7I
m
7
f ILl 1Ll.1Ll ILl ILl ILl ILl ILl II I L
fREQ SWFNG
....
/ f7I f7I Tl
m __
(_J
117fT/
m
I
1Ll.1LI ..LI III 1.1Ll ..LI
III
START AMPTO STOP
The display usually shows the start amplitude and the stop amplitude settings
If
another active function is selected, the display could indicate amplitude sweep with
the SWPNG annunciator or by displaying SWEEP in the right portion of the display
above the AMPTD annunciator.
4)
Calculate a sweep time setting that could be selected for a desired step size.
4a) You need to choose the step size so the amplitude span divided by the step size is
an integer. You must also ensure that the desired step size is between the maximum
and minimum step size possible
The maximum step size is equal to the maximum of:
0.1 dB
or
1
Start Amplitude (in dBm) - Stop Amplitude (in dBm)
I
5
The minimllfll step size is equal to 01 dB
4b) When the sweep step size equals the nmumum, use a sweep time setting (in ms)
equal to or greater than the result of the following calculation.
[( I
Start Amplitude (in dBm) - Stop Amplitude (in dBm)
I)
+
1J
X
3 ms
Step Size (in
dB)
When the sweep step size is greater than the minimum, use a sweep time setting
greater than or equal to the result of the above calculation, but less thall the result of
the following calculation
[( I
Start Amplitude
(ill dBm) -
Stop Amplitude
(in dBm)
I)
+
2]
X
3 ms
Step Size (in dB)
3-89