HP 8510, User Manual

Page: 41 / 73

5. Select the maximum n um b er of p oints required for the measuremen t, then p erform the
appropriate measure- men t calibration.
Note that the HP 8510 pulse output is set to the active state (RF alwa ys On) during
measuremen t of the calibration standards. F or external triggering, the pulse mo dulation is
op erating during the calibration, so the pulse width or time span cannot b e c hanged after
calibration.
6. F or the next pulse prole frequency rep eat this sequence.
With sev eral cal sets created in this w a y , y ou can select eac h pulse prole frequency in turn b y
recalling the corresp onding cal set.
Frequency Domain Using Frequency List
In the ab o v e measuremen t calibration pro cedure it is necessary to p erform a separate
calibration for eac h pulse prole frequency . This is not a problem for simple resp onse-only
calibrations, but when accuracy considerations require the use of 1-P ort or 2-P ort calibrations,
connecting the necessary sequence of standards rep eatedly can b e tedious. As an alternative,
the frequency list feature allo ws the standards to b e connected once for all pulse prole
frequencies.
P erform the calibration as follows.
1. Press 4 DOMAIN 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FREQUENCY to select the frequency domain.
If the W annotation is not display ed, the wideband detector m ust b e selected b efore
pro ceeding.
2.
Press 4 SYSTEM 5
NNNNNNNNNNNNNN
MORE
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PULSE CONFIG
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DETECTOR: WIDE BW .
3.
Press 4 STIMULUS MENU 5
NNNNNNNNNNNNNN
MORE
NNNNNNNNNNNNNNNNNNNNNNNNNNNNN
EDIT LIST to display the Edit List men u. Create a segmen t
for eac h pulse prole frequency to b e measured. Eac h segmen t is dened suc h that the
start and stop frequencies are iden tical and the n um b er of p oints in eac h segmen t is the
n um b er of p oints to b e display ed in the pulse prole measuremen t. F or example, the
follo wing sequence creates a frequency list to measure four pulse prole frequencies, of 51
p oints eac h.
a.
Press
NNNNNNNNNNN
ADD 4 ST ART 5 4 3 5 4 G/n 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
NUMBER of POINTS 4 5 5 4 1 5 4 x1 5
NNNNNNNNNNNNNN
DONE .
b.
Press
NNNNNNNNNNN
ADD 4
ST ART
5 4
4
5 4
G/n
5 4
x1
5
NNNNNNNNNNNNNN
DONE .
c.
Press
NNNNNNNNNNN
ADD 4 ST ART 5 4 5 5 4 G/n 5 4 x1 5
NNNNNNNNNNNNNN
DONE .
d.
Press
NNNNNNNNNNN
ADD 4 ST ART 5 4 6 5 4 G/n 5 4 x1 5
NNNNNNNNNNNNNN
DONE .
e.
Press
NNNNNNNNNNNNNN
DONE
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FREQUENCY LIST . The frequency list will b e measured.
Figure 7-1 sho ws the resulting display . Pro ceed with the appropriate measuremen t
calibration.
7-2 Pulse Profile Domain Measurements