112
Chapter 4
Performance Tests
1. Conversion Loss
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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:
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 R Pwr Mtr Correction Factor
−
SA Marker Amplitude
−
Coupling Factor
Power Meter Reading =
−
0.03 dBm
Cal Factor =
94.8%
or
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
or
Conversion Loss = (
−
0.03) + (0.23 dB)
−
(
−
44.78 dBm)
−
8.93 dB = 36.05 dB.
Summary of Contents for 11974 Series
Page 5: ...4 ...
Page 8: ...7 General Information 1 General Information ...
Page 28: ...27 Installation 2 Installation ...
Page 47: ...46 Chapter2 Installation Returning Equipment for Service Installation ...
Page 48: ...47 Operation 3 Operation ...
Page 97: ...96 Chapter3 Operation Using 8561A 62A 62B Spectrum Analyzers Operation ...
Page 98: ...97 Performance Tests 4 Performance Tests ...
Page 148: ...147 Safety and Regulatory Information 5 Safety and Regulatory Information ...