HP 8568B, Performance Tests And Adjustments Manual, Page: 219 / 313

13. 20 MHz Reference Adjustments
Spectrum Analyzer
(
CENTER FREQUENCY
_)
to 20.34 MHz and
SCALE to 10 dB/division.
10. Adjust 20.34 MHz NULL for minimum 20.34 MHz
signal at as indicated by HP Spectrum Analyzer
display. With signal the plates of the NULL adjustment
capacitor should be meshed approximately halfway. If fully
meshed or fully unmeshed, a circuit malfunction is indicated.
11. Disconnect frequency synthesizer from and reconnect cable
2 (red) to Connect power meter to rear-panel INT REF
OUT connector.
12. Power meter indication should be no more than 5 less than
that noted in step 3 Time Base output).
13. Disconnect from ground. Connect power meter to
14. Adjust COMB DRIVE for power meter indication of
+ 10.0
15. Connect power meter to through cable 3 (orange). Power
meter indication should be at least -15 Reconnect cable 3
(orange) to
16. Connect power meter to through cable 4 (yellow). Power
meter indication should be at least -10 Reconnect cable 4
(yellow) to
17. On the oscilloscope, key in to perform a soft
reset.
18. Connect
the
channel 1 probe to the oscilloscope’s rear panel
PROBE COMPENSATION AC CALIBRATOR OUTPUT connector.
Press
[
AUTO SCALE
).
Adjust the channel 1 probe for an optimum
square wave display on the oscilloscope.
19. Connect oscilloscope with the HP probe to and
the ground to the analyzer’s chassis ground.
20. Set the oscilloscope controls as follows:
Press
Channel 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..on
amplitude scale . . . . . . . . . . . . . . . . . . . . . . . . . . .
div
offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..OV
coupling
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..dc
probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . off
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . off
Press
EDGE TRIGGER . . . . . . . . . . . . . . . . . . . . . . . . trig’d auto
source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800 mv edge
Press
time scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 ns
delay . . . . . . .
reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..CNTR
Press
connect dots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . .......... AVG
Adjustments