Agilent Technologies HP 8566B Spécifications télécharger pdf (Page 322)

2 1. Frequency Response Adjustments

clockwise to increase the level of the displayed signal responses

above 500 MHz.

Note

It might be helpful to increase or decrease the spectrum analyzer

[SWEEP TIME) setting while adjusting A6AllR66 A2 and A6AllR48 Al,

particularly when making fine adjustments. An increase in spectrum

analyzer sweep time results in closer spacing of the displayed

responses, but slows the adjustment.

36.

37.

38.

39.

On the synthesized sweeper, key in

(jZ%?]

LEVELING,

[SWEEP

TIME_)

150s,

SWEEP

Cm],

SWEEP

(SINGLEI).

On the spectrum analyzer, key in SWEEP TIME

m),

TRACE B

(CLEAR-WRITE], TRACE B

[NlAXj.

On the synthesized sweeper, press SWEEP

L-1

and wait for

a sweep to complete (150 seconds) and the SWEEP LED to turn

off. As the synthesized sweeper tunes from 10 MHz to 2.5

GHz,

the input signal should be displayed as a TRACE A response, and

the spectrum analyzer frequency response should be displayed as

TRACE B, as shown in Figure 3-93.

PO!

START

MHZ STOP 2

GHZ

RES

3 MHZ “SW 3 MHZ SWP 52.3

msec

Figure 3-93.

Typical Frequency Response (10 MHz

2.5

GHz)

On the spectrum analyzer, key in TRACE B

TRACE A

(ml,

MARKER

(j-1

and use the DATA knob to position a

marker on the lowest point on the TRACE B waveform. Then,

press MARKER

Ia],

MARKER

(

PEAK SEARCH

)

to position a second

marker on the highest point on the TRACE B waveform. Total

peak-to-peak deviation of the displayed trace should be less than

1.20

dB.

Note

To provide the spectrum analyzer with a 10 MHz to 2.5

GHz

input

signal of sufficient flatness for measuring frequency response, the

synthesized sweeper must be leveled externally with a power meter

with a relatively slow sweep time (at least 40 seconds). However,

relative flatness adjustments are made with the synthesized sweeper

3-l

82 Adjustments

1 2 ... 317 318 319 320 321 322 323 324 325 326 327 ... 404 405

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Agilent Technologies HP 8566B Spécifications Page 322

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