Agilent Technologies HP 8566B Spécifications télécharger pdf (Page 290)

17. 20/30 Loop Phase Lock Adjustments

20. Press

CmGHz_

on the second spectrum analyzer. Set the controls

of the second spectrum analyzer as follows:

CENTER FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.300

MHz

FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.500

MHz

REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

dBm

21. Set the dc power supply for an output of + 16.0

0.1 Vdc.

Connect the positive lead of the dc power supply to

AlOAlTP3

and the negative lead to the RF Section chassis (ground).

22. Press MARKER (PEAK SEARCH) on the second spectrum analyzer.

The output frequency of the PLLl VCO should be 310 MHz

MHz as indicated by the marker on the display of the second

spectrum analyzer. If it is not, remove the metal shield from

AlOAl

PLLl

VCO Assembly and increase or decrease the spacing

between turns of coil

AlOAlL4.

The

PLLl

VCO frequency is increased by spreading the turns

of A10AlL4 apart (decreasing the inductance), and decreased

by compressing the turns of

AlOAlL4

together (increasing the

inductance). Adjust

AlOAlL4

for a

PLLl

VCO output frequency

of approximately 308 MHz, since the metal shield increases the

PLLl VCO frequency approximately 2 MHz when reinstalled.

23. Set the dc power supply for an output of +4.0

0.1 Vdc.

24. Press MARKER [PEAK SEARCH] on the second spectrum analyzer.

The frequency of the

PLLl

VCO output signal should drop below

200 MHz, and the power level should be at least -7

dBm,

indicated by the marker on the display of the second spectrum

analyzer.

25. Repeat steps 21 through 24 as necessary until no further

adjustment is required.

26. Set the RF Section LINE switch to STANDBY. Replace the metal

shield on AlOAl

PLLl

VCO Assembly if it was removed, and

reinstall AlOAl PLLl VCO Assembly in the RF Section. Reconnect

the cable 1 (brown) to

AlOA5J5

SCAN .l-5 MHz OUT and the

cable 5 (green) to

AlOAlJ2

OUT 20-30 MHz.

27. Remove

AlOA3

PLLl

IF Assembly from the RF Section, and

install it on an extender board. Reconnect the cable 6 (blue)

to AlOA4J2 OUT 160-166 MHz. Leave the cable 4 (yellow)

disconnected from

AlOAlJ3

OUT 200-300 MHz, and the cable 3

(orange) disconnected from AlOA3J3 OUT PLLl IF.

28. Use a BNC to SMB Snap-on Test Cable to connect the RF INPUT of

the second spectrum analyzer to

AlOA3J3

OUT

PLLl

3-150 Adjustments

1 2 ... 285 286 287 288 289 290 291 292 293 294 295 ... 404 405

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Agilent Technologies HP 8566B Spécifications Page 290

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