Agilent Technologies HP 8566B Spécifications télécharger pdf (Page 274)

15. M/N Loop Adjustments

14.

Adjust the AMPTD CAL control on the second spectrum analyzer

for a -10.00

dBm

displayed signal, and then press (SHIFT)

(FREQUENCY SPAN]~.

15.

Set the controls of the second spectrum analyzer as follows:

16.

17.

Set the RF Section LINE switch to ON.

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

.375

MHz

FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 MHz

REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5

dBm

LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

dB/DIV

Disconnect the cable 9 (white)

A7A4AlA2Wl

from

A7A4A2J3

on the

A7A4

M/N Output Assembly. Refer to Figure 3-68 for

the location of

A7A4AlA2Wl

and

A7A4A2J3.

Use an SMB

male-to-male adapter and a BNC to SMB Snap-on Test Cable to

connect the white cable to the input of the second spectrum

analyzer.

Caution

Damage might occur to the M/N VCO tuning diodes on

A7A4

M/N

Output Assembly if a positive voltage is applied to A7A4TPl TUNE

test point.

18. Set the dc power supply for an output of -35.0

0.5 Vdc.

Connect the positive lead of the dc power supply to the RF

Section chassis (ground). Then, connect the negative lead to

A7A4TPl TUNE test point.

19. Adjust A7A4AlAlC5 PWR for an M/N VCO output level of 0.0

dBm

2.0

as indicated on the second spectrum analyzer

display. Refer to Figure 3-68 for the location of

A7A4AlAlC5

PWR adjustment.

20. Slowly reduce the output voltage of the dc power supply from

-35.0 Vdc to -2.3 Vdc while monitoring the M/N VCO output

level displayed on the second spectrum analyzer. The M/N VCO

output level at

A7A4A2J3

should be greater than -2.0

dBm

between 355 MHz (-2.3 Vdc) and 395 MHz (-35 Vdc).

21. Set the RF Section LINE switch to STANDBY.

22. Reconnect the white cable to

A7A4A2J3

on the

A7A4

M/N Output

Assembly, and then reinstall the

A7A4

M/N

Output Assembly in

the RF Section. Reconnect the cable 92 (white/red) to A7A4Jl

355-395 OUT.

23. Repeat steps 5 through 11.

24. Reconnect the cable 93 (white/orange) to

A7A4J2

M/N OUT.

25. Remove the LOCK INDICATOR DISABLE jumper from

A12TP2

and

A12TP3.

Disconnect the frequency counter from the RF

Section rear-panel FREQ REFERENCE INT connector, and

reconnect the short jumper cable between the FREQ REFERENCE

INT and EXT connectors. Set the RF Section rear-panel switch to

INT.

3-134 Adjustments

1 2 ... 269 270 271 272 273 274 275 276 277 278 279 ... 404 405

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Agilent Technologies HP 8566B Spécifications Page 274

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