Agilent Technologies HP 8566B Especificações descarregar pdf (Página 288)

17. 20/30 Loop Phase Lock Adjustments

3. Set the frequency synthesizer for a 20

kHz,

dBm

output.

Connect the frequency synthesizer 50-ohm OUTPUT to

AlOAlTP3

using a BNC to Alligator clip adapter. Connect the ground lead of

the adapter to the metal cover of the

AlOAl

PLLl

VCO Assembly.

4. Connect the high-frequency active probe to the RF INPUT of

the second spectrum analyzer and to the probe power supply, as

shown in Figure 3-77.

5. Press

@ZZZJ

on the second spectrum analyzer. Connect the

active probe tip to the CAL OUTPUT signal, and press (RECALL].

6. Adjust the AMPTD CAL control on the second spectrum analyzer

for a -10.00

dBm

displayed signal, and then press

ISYIFT)

[FREQUENCY

wAN)~.

7. Set the controls of the second spectrum analyzer as follows:

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

.35

kHz

FREQUENCY SPAN

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 kHz

REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0

dBm

LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 dB/DIV

VIDEO BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.300

8. Connect the active probe tip to the lead of A10AlL7 closest to

AlOAlC22,

as indicated in Figure 3-78. The 20

kHz

signal (from

the 40

kHz

LPF) should be visible on the display of the second

spectrum analyzer.

9. Press MARKER [PEAK SEARCH],

~MKR

REF

LVL]

on the second

spectrum analyzer to position the peak of the 20

kHz

signal at the

top graticule line. Press MARKER la] on the second spectrum

analyzer.

10. Set the frequency synthesizer for an output frequency of 50

kHz.

Note

Adjustments

AlOAlL7

and

AlOAlL8

are sealed at the factory and

normally do not require readjustment unless a component failure has

occurred. To verify their proper adjustment, skip to step 12.

11. Adjust

AlOAlL7

and

AlOAlL8

kHz

NULL adjustments to

minimize the amplitude of the 50

kHz

signal displayed on the

second spectrum analyzer. Refer to Figure 3-78 for the location of

AlOAlL7 and AlOAlL8 50

kHz

NULL adjustments.

3-148 Adjustments

1 2 ... 283 284 285 286 287 288 289 290 291 292 293 ... 404 405

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