Agilent Technologies HP 8566B Spécifications télécharger pdf (Page 339)

2 1. Frequency Response Adjustments

Note

SWEEP TIME

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.30

SWEEP

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CONT

148. On the spectrum analyzer, key in TRACE A [CLEAR-WRITE),

(SWEEP

TIME)

2s,

MARKER (OFF),

I=].

As the spectrum

analyzer completes each sweep, a series of approximately 23 new

responses should be displayed. The peaks of these responses

coarsely outline the spectrum analyzer frequency response.

149. Gradually adjust (Band E Lower Segment) A6AllR60 El and

(Band E Upper Segment)

A6AllR78

E2 for maximum flatness of

the displayed signal responses. The adjustments are interactive,

with A6AllR60 El having the most effect on the level of the

displayed signals below mid-band (approximately 20.3

GHz),

and A6AllR78 E2 having the most effect on the level of

the displayed signals above mid-band. Adjust A6AllR60 El

counterclockwise to increase the level of the displayed signal

responses below mid-band. Adjust

A6AllR78

E2 clockwise

to increase the level of the displayed signal responses above

mid-band. See Figure 3-90 for the locations of A6AllR60 El and

A6Al

lR78

E2.

If the displayed signals at the high end of the band drop off by more

than 3-4

dB,

center A6AllR78 E2 and proceed to step 150.

150. On the spectrum analyzer, key in [SWEEP TIME)

5s,

LOG SCALE

ENTER

dB/DIv]

dB,

TRACE B (VIEW),

IsAvE_)

C-1

2s,

TRACE B

[BLANK),

(HOLD].

151. Readjust 17-turn (YTX Diode Bias) potentiometer

A6AlOR95

to maximize the overall level of the displayed signal responses

from 18.6

GHz

to 22.0

GHz

on the spectrum analyzer display.

Then, adjust

A6AlOR95

VE clockwise until signal responses at

the high end of the band drop in amplitude by approximately 1.5

dB.

152. Readjust 22-turn (IF Offset) potentiometer

A6A12R82

E as

necessary to maximize the

overall

level of the displayed

signal

responses from 18.6

GHz

to 22.0

GHz

on the spectrum analyzer

display. If the displayed

signal

responses peak at widely different

settings of

A6A12R82

E, perform the following steps:

a. Adjust 22-turn (YTX Linearity) potentiometers

A6AlOR70

LB4

and

A6AlOR76

LR4 fully counterclockwise if they have not

already been so adjusted; do not readjust

A6A12R40

LBl,

A6AlOR41

LB2,

A6AlOR42

LB3,

A6AlOR31

LRl,

A6A610R34

LR2, or

A6AlOR37

LR3.

b. Readjust 22-turn (IF Offset) potentiometer

A6A12R82

E as

necessary to maximize the overall level of the displayed signal

responses at the low end of the band.

c. On the spectrum analyzer, key in MARKER

(NORMAL)

and

position the marker at the point in the band where the signal

responses begin to fall off from their maximum value.

d. Readjust 22-turn (YTX Linearity) potentiometer

A6AlOR70

LB4 clockwise until the displayed signal responses at the high

end of the band begin to drop. Continue to adjust

A6AlOR70

LB4 until the

rolloff

point aligns with the position of the

Adjustments

3-l

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Agilent Technologies HP 8566B Spécifications Page 339

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