Performance Verification
9. Record the gene
rator signal amplitude in the Test Record:
a. Select the Reference Marker (MR) and then click the To Center key to
center the MR marker on the peak of the 1000 MHz signal.
b. Record the MR Marker amplitude (upper-left corner of the screen). This
value is called Carrier Power and is used below.
10. Obtain the phase noise at 1 MHz offset. Start by setting the RSA5100B to the
settings listed below:
a. Center Frequency (Freq key): 1001 MHz
b. Span (Span key): 10 kHz
c. Reference Level Offset: -30 dBm (This is the amplitude control in the
upper left of the display.)
d. Set input attenuation for manual control:
Select Setup > Amplitude > Internal Settings.
Deselect the Internal Attenuator Auto check box.
Set Internal Attenuator to 0 dB.
11. Select Run > Run Single.
12. Center the M1 marker in the middle of the screen:
Select Marker 1 (M1).
Select Readouts > Power in the Define Markers control panel.
Set the M1 frequency to 1001 MHz using the Frequency field on the
Marker control bar.
The marker is now located at the center frequency position.
13. Read the noise amplitude on Marker M1 in dBm/Hz.
14. Subtract the value of MR obtained in step 9 to obtain the phase noise
amplitude at 1 MHz.
Forexample,ifMR=4.7dBmandM1=–129.6dBm/Hz,thenM1-MR
=
–134.3 dBc/Hz.
15. Enter the value obtained at 1 MHz in the test record for phase noise at 1 MHz.
16. Obtain the phase noise at 6 MHz offset. Start by setting the RSA5100B to the
settings listed below:
a. Center Frequency (Freq key): 1006 MHz.
b. Span (Span key): 10 kHz.
c. Select Run > Run Single.
d. Set the Marker M1 Frequency to 1006 MHz.
RSA5100B Series Technical Reference 83
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