Agilent Technologies HP 70910A Guide de l'utilisateur télécharger pdf (Page 112)

112 Chapter 4

Performance Tests

1. Conversion Loss

Performance Tests

20.Calculate the conversion loss (CL) of the 11974 with the equations given below.

If the power meter calibration factor is given in % or decimal form, for example, 93% or

0.93, then:

If the power meter correction factor is given in dB, then:

For Example:

then:

Record the conversion loss in Table 4-7 on page 140.

NOTE The conversion loss indicated on the 11974 calibration label includes the loss

in the IF cable. If another cable other than the specified cable is used, then

the loss in that cable must be compensated for when making amplitude

measurements.

21.Increase the frequency of the synthesized sweeper 500 MHz by pressing

CW ⇑.

22.Turn off the RF power on the synthesized sweeper by pressing

RF and zero the 432A

Power Meter, then turn the synthesized sweeper RF power back on again.

23.On the spectrum analyzer, press

CENTER FREQUENCY ⇑ to increase the spectrum

analyzer frequency.

CL = Power Meter Reading − 10 × log (Cal Factor) − SA Marker Amplitude − Coupling Factor

CL = Pwr Mtr Reading + Pwr Mtr Correction Factor

− SA Marker Amplitude − Coupling Factor

Power Meter Reading =

−0.03 dBm

Cal Factor = 94.8%

Correction Factor = 0.23 dB

Spectrum Analyzer Reading =

−44.78 dBm

Coupling Factor = 8.93 dB

Conversion Loss = (

−0.03) − 10 × log(.948) − (−44.78 dBm) −8.93 dB = 36.05 dB

Conversion Loss = (

−0.03) + (0.23 dB) − (−44.78 dBm) −8.93 dB = 36.05 dB.

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Agilent Technologies HP 70910A Guide de l'utilisateur Page 112