HP 8562E, Service Manual

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16. Use a DVM to monitor the voltage at 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 opens when the sweep time is set to 2 seconds.
21. Check that and close when the sweep time is set to 20 seconds.
Sweep Time
200 ms
2 s
20 s
Table 11-16. Settings for Switches and Comparators
Switch Switch Switch Comparator Comparator
Pin 1
Pin 7
Open Open Closed High High
Open Open Open
High High
Closed Closed Open High High
During multiband sweeps, the sweep ramp at pin 15 should go from 0 V to V
for each band or portions of a band covered. See function block A of Al4 frequency control
schematic in the
HP 8560 E-Series Spectrum Analyzers Component Level Information
binder.
However, the scan ramp at 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
to
13.2 span with instrument preset conditions.
Synthesizer Section 11-41