13. 20 MHz Reference Adjustments

8566AB Spectrum Analyzer (CENTER FREQUENCY_) to 20.34 MHz and SCALE to 10 dB/division.

10.Adjust Al6 20.34 MHz NULL A16C12 for minimum 20.34 MHz signal at A16J3 as indicated by HP 8566A/B Spectrum Analyzer display. With signal nulled, 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 A16Jl and reconnect cable 2 (red) to A16Jl. Connect power meter to rear-panel INT REF OUT connector.

12.Power meter indication should be no more than 5 dB less than that noted in step 3 (A27 Time Base output).

13.Disconnect A16TP4 from ground. Connect power meter to A16J3.

14.Adjust Al6 COMB DRIVE A16R31 for power meter indication of

+10.0 dBm +l.O dB.

15.Connect power meter to A16J4 through cable 3 (orange). Power meter indication should be at least -15 dBm. Reconnect cable 3 (orange) to A6J2.

16.Connect power meter to A16J5 through cable 4 (yellow). Power meter indication should be at least -10 dBm. Reconnect cable 4 (yellow) to A8Jl.

17.On the oscilloscope, key in [RECALL) [mj 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 10432A probe to A16TP3 and the ground to the analyzer’s chassis ground.

20.Set the oscilloscope controls as follows:

Press m):

 

Channel 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . ..on

amplitude scale . . . . . . . . . . . . . . . . . . . . . . . . .

. . 1V / div

offset .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . ..OV

coupling

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . ..dc

probe . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . 1O:l

Channel2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . off

Channel4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . off

Press ITRIG):

 

EDGE TRIGGER . . . . . . . . . . . . . . . . . . . . . .

. . trig’d auto

source

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . 1

level . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

800 mv edge

Press @iKZi%BASE_):

 

time scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . 20 ns

delay .

. . . . . . .._.............................

40ns

reference . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . ..CNTR

Press @KKK]:

 

connect

dots . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . on

DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . .

.......... AVG

Adjustments 3-105