HP 8562E Service Manual page 415

16. Use a DVM to monitor the voltage at A14J18 pin 4. The voltage should measure
approximately -8.45 Vdc.
17. Set the spectrum analyzer sweep time to 100 ms. The voltage at J18 pin 4 should measure
approximately -4.21 Vdc.
18. Set the spectrum analyzer sweep time to 200 ms. The voltage at J18 pin 4 should measure
approximately -2.1 Vdc.
19. The analog switches and comparators should be set as listed in Table 11-16.
20. Check that U312D opens when the sweep time is set to 2 seconds.
21. Check that U312B and U312C close when the sweep time is set to 20 seconds.
Sweep Time
200 ms
2 s
20 s
During multiband sweeps, the sweep ramp at A14J15 pin 15 should go from 0 V to +lO V
for each band or portions of a band covered. See function block A of Al4 frequency control
HP 8560 E-Series Spectrum Analyzers Component Level Information
schematic in the
However, the scan ramp at A14U325A pin 1 is scaled according to the percentage of the total
span that the band is covering. See function block B of Al4 schematic. Also, the sum of the
individual ramps is 10 V. Figure 11-9 illustrates both sweep and the scan ramp for a 0 GHz to
13.2 GHz span with instrument preset conditions.
Table 11-16. Settings for Switches and Comparators
Switch
Switch
Open Open
Open
Open
Closed Closed
Switch Comparator
Closed High
High
Open
High
Open
Synthesizer Section 11-41
Comparator
High
High
High
binder.