Agilent Technologies HP 8566B Spécifications télécharger pdf (Page 269)

14. 100 MHz VCXO Adjustments

TRACE A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CLEAR-WRITE

TRACE B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BLANK

8. Adjust

A7A2C4

100 MHz slowly through its full range while

monitoring the display of the second spectrum analyzer. The

output of the 100 MHz VCXO should be a single output signal

near 100 MHz, with no spurious oscillations at other frequencies.

If spurious oscillations are present, increase the value of

factoryselected component

A7A2R3

by one standard value and

check again for spurious oscillations. Refer to

‘lhble

3-3 for the

acceptable range of values, and to Table 3-4 for HP part numbers;

refer to Figure 3-65 for the location of

A7A2R3.

9. Disconnect the second spectrum analyzer from

A7A2J2

100 MHz

OUT, and connect the frequency counter to

A7A2J2.

10. Adjust

A7A2C4

100 MHz for a frequency counter indication of

100.0000 fO.0001 MHz

(f100

Hz).

11. Disconnect the dc power supply from the

A7A2TPl

TUNE test

point, and jumper

A7A2TPl

TUNE to ground.

12. Verify that the frequency counter indication is less than 100.0000

MHz. If it is not, repeat, steps 3 through 11.

13. Disconnect, the jumper from

A7A2TPl

TUNE and ground. Set the

dc power supply for an output of -25 Vdc, and connect the -25

Vdc output of the dc power supply to

A7A2TPl

TUNE.

14. Verify that the frequency counter indication is greater than

100.0000 MHz. If it is not, repeat steps 3 through 13.

15. Disconnect the dc power supply from

A7A2TPl

TUNE, and

reconnect the cable 83 (gray/orange) to

A7A2J2

100 MHz OUT.

400

MHz

output

16. Disconnect the cable 96 (white/blue) from A7A3Jl 400 MHz IN,

Adjustment

and connect this cable to the RF INPUT of the second spectrum

analyzer using a BNC-to-SMB snap-on test cable and an SMB

male-to-male adapter.

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

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

.500

MHz

FREQUENCY SPAN

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

GHz

REFERENCE LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7

dBm

RES BW

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AUTO

LOG SCALE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 dB/div

TRACE A

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CLEAR-WRITE

18. The 400 MHz output signal should be visible on the display of

the second spectrum analyzer, along with other harmonics of

100 MHz. Adjust the

A7A2C3,

A7A2C2,

and A7A2Cl 400 MHz

adjustments in sequence to maximize the power level of the 400

MHz output signal and minimize all other harmonics of 100 MHz.

Be sure to perform the adjustments in the proper sequence; it

might be necessary to repeat the sequence more than once.

19. Note the level of any 100 MHz harmonics displayed on the second

spectrum analyzer relative to the power level of the 400 MHz

Adjustments 3-129

1 2 ... 264 265 266 267 268 269 270 271 272 273 274 ... 404 405

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Agilent Technologies HP 8566B Spécifications Page 269

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