HP 8642A Operating Manual page 116

Model 8642A/B Operation
Amplitude Sweep (cont'd)
Example for Calculation # 3 (cont'd)
Display
CRuncH CRuncH in HI CT m CT HI m . I G B
The display shows that the amplitude values are possible and are currently being set.
i pi p ni pi ni pi p p m ~? .. i nt ni n m „ —j i pi
TI
m
FREQ SWPNG STAHT AMPTD 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
| Start Amplitude (in dBm) - Stop Amplitude (in dBm) \
5
The minimum step size is equal to 0.1 dB.
4b) When the sweep step size equals the minimum, use a sweep time setting (in ms)
equal to or greater than the result of the following calculation.
/1 Start Amplitude (in dBm) — Stop Amplitude (in dBm) \
\ 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 than the result of
the following calculation:
/1 Start Amplitude (in dBm) - Stop Amplitude (in dBm) \
\ Step Size (in dB)
+ 1 X 3 ms
+ 2 X 3 ms
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