Agilent Technologies HP 8566B Especificações descarregar pdf (Página 103)

18. Gain Compression Test

OUTPUT LEVEL RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . -20

dBm

Note

Care should be taken to disturb the cable assembly as little as possible,

since flexing may cause a change in the measured power level. The

power sensor should be placed near the spectrum analyzer input to

minimize flexing when the cable is moved.

10.

11.

12.

13.

14.

15.

Connect equipment as shown in Figure 2-32, with output of

synthesizer connected to power sensor. Power is measured at

the end of the cable assembly, not at the synthesizer output

connector. Adjust synthesizer output level for a power meter

indication of -25.00

dBm

f0.05

dB.

Disconnect cable assembly from power sensor and connect free

end to spectrum analyzer RF INPUT as indicated in Figure 2-32.

Key in analyzer settings as follows:

GHz

. . .

OHz

.OdB

-15

dBm

. . .

30 Hz

. . .

3 MHz

Press the SCALE LIN pushbutton, then press (SHIFT)

IREs]

(AUTOY

to obtain amplitude readouts in

dBm.

Turn the AMPTD

CAL control fully clockwise.

Press MARKER (NORMAL)

Connect cable to power sensor and adjust synthesizer output level

for a power meter reading of -15.00

dBm

f0.02

dB.

Reconnect cable to the spectrum analyzer RF INPUT.

Change spectrum analyzer [REFERENCE LEVEL) to -5

dBm.

Record the MKR A amplitude:

dB.

This is the IF

gain error in changing the reference level from -15

dBm

to -5

dBm

with 0

input attenuation.

Set [REFERENCE LEVEL) to -15

dBm.

Adjust AMPTD CAL to place

the signal trace approximately 1 division down from the reference

level line.

Press MARKER

Connect cable to power sensor and adjust synthesizer output level

for a power meter indication of -5

dBm

f0.02

dB.

Reconnect

cable to spectrum analyzer input.

Change [REFERENCE LEVEL) to -5

dBm.

Record the MKR A amplitude:

dB.

Subtract the value obtained in step 9 from the value recorded

in step 13 to find the gain compression:

dB.

The

result should be

>-1.0

(less than 1

compression).

Press

Cm)

on the spectrum analyzer. Press (SHIFT)

1-J)

[SHIFT)

v[o)

0 dBm.

2-76 Performance Tests

1 2 ... 98 99 100 101 102 103 104 105 106 107 108 ... 404 405

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