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Performance Tests
1. Conversion Loss
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:
CL = Power Meter Reading − 10 × log (Cal Factor) − SA Marker Amplitude − Coupling Factor
If the power meter correction factor is given in dB, then:
CL = Pwr Mtr Reading + Pwr Mtr Correction Factor − SA Marker Amplitude − Coupling Factor
For Example:
Power Meter Reading =
Cal Factor =
or
Correction Factor =
Spectrum Analyzer Reading =
Coupling Factor =
then:
Conversion Loss = ( − 0.03) − 10 × log(.948) − ( − 44.78 dBm) − 8.93 dB = 36.05 dB
or
Conversion Loss = ( − 0.03) + (0.23 dB) − ( − 44.78 dBm) − 8.93 dB = 36.05 dB.
Record the conversion loss in
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
22.Turn off the RF power on the synthesized sweeper by pressing
Power Meter, then turn the synthesized sweeper RF power back on again.
23.On the spectrum analyzer, press
analyzer frequency.
112
− 0.03 dBm
94.8%
0.23 dB
− 44.78 dBm
8.93 dB
Table 4-7
on page 140.
CENTER FREQUENCY ⇑
CW ⇑
.
and zero the 432A
RF
to increase the spectrum
Chapter 4
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