Agilent Technologies HP 8566B Specifikace stáhnout pdf (Strana 242)

11. Down/Up Converter Adjustments

21.4

MHz

Gain

18.4

MHz

Null

Adjustment

10.

11.

12.

13.

14.

15.

16.

17.

18.

19.

20.

21.

22.

~CENTER

FREQUENCY) 21.4 MHz,

CFREQUENCY

SPAN]

kHz,

fj’j]

kHz,

[REFERENCE LEVEL) -30

dBm.

Connect the tip of the active probe to

A4A6A2TP4.

On the

second spectrum analyzer, press

CREFERENCE

LEVEL] and use the

DATA knob to position the peak of the displayed 2 1.4 MHz signal

near the top CRT graticule line.

On the second spectrum analyzer, key in

(jj’

dB,

MARKER (PEAK SEARCH] and record the level of the displayed 21.4

MHz signal:

Signal level at

A4A6A2TP4:

dBm

On the second spectrum analyzer, key in MARKER [al,

~CENTER

FREQUENCY] 3 MHZ.

Connect the tip of the active probe to

A4A6A2Pl-9.

On the

second spectrum analyzer, key in MARKER [PEAK SEARCH] and

record the level of the displayed 3 MHz signal:

Signal level at A4A6A2Pl-9:

The 3 MHz signal level at A4A6A2Pl-9 measured in step 12

should be 10.0

f0.6

lower than the 21.4 MHz signal level

A4A6A2TP4

measured in step 10. If not, change the value

of factory-select resistor

A4A6A2R33.

A 10% decrease in the

value

A4A6A2R33

increases the signal level at

A4A6A2Pl-9

approximately 0.6

dB.

Refer to Table 3-3 for the acceptable range

of values for

A4A6A2R33

and to

Table

3-4 for HP part numbers.

Set the spectrum analyzer LINE switch to STANDBY.

Remove

A4A6

Down/Up Converter Assembly from the two

extender boards and reinstall in the IF-Display Section.

Set the spectrum analyzer LINE switch to ON and press

C-1.

On the spectrum analyzer, key in [CENTER FREQUENCY) 100 MHz,

~FREQUENCY

SPAN_)

kHz,

(RES]

kHz,

[REFERENCE

LEVELS

-7

dBm,

and press the LIN pushbutton.

On the spectrum analyzer, key in MARKER (PEAK SEARCH),

MARKER

Ia],

(jj-

1 MHz.

Adjust A4A6AlR29 WIDE GAIN for a MKR A indication of 1.00 X,

aligning the two markers on the CRT display. See Figure 3-51 for

the adjustment location.

Disconnect the spectrum analyzer CAL OUTPUT from the RF

INPUT.

On the spectrum analyzer, key in (REFERENCE

LEVELI)

-70

dBm,

(jj)

1 kHz, MARKER (OFF).

On the second spectrum analyzer, key in

c-1,

[START

FREQ]

MHz,

CsTopFREQ)

50 MHz,

IjREs)

100

kHz.

3-102

Adjustments

1 2 ... 237 238 239 240 241 242 243 244 245 246 247 ... 404 405

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