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Measurements Operation Verification
MS278XB OM 5-81
Single Sideband Phase Noise
The following test can be used to verify that the MS2781B is within its Single Sideband Phase Noise
specifications. A signal source with phase noise performance of at least 10 dB lower than the MS2781B is
required for this procedure.
Test Setup
Connect the equipment as shown in the figure below:
Test Procedure
1. Set up the instrument as shown in Figure 5-52.
2. Turn on both the MS2781B Signal Analyzer and the low noise signal generator, and allow them to
warm up for one hour.
3. Press the Preset key on the MS2781B to reset the instrument to factory default state.
4. Set the MS2781B to use External Reference signal.
5. Set the output level of the low noise signal generator to 0 dBm.
6. Set the output frequency of the low noise signal generator to 1 GHz CW.
7. Set up the MS2781B as follows:
a. Center Frequency: 1 GHz
b. Reference Level: 0 dBm
c. VBW: Auto
d. Sweep Time: Auto
e. Attenuation: 10 dB
f. Trace Mode: Average
g. Averaging Size: 200
h. Detector: RMS
8. Connect the output of the low noise signal generator to the input of the MS2781B with a coaxial
cable and an adapter.
9. Set Span to 250 Hz and RBW to 10 Hz.
Figure 5-52. Equipment Setup for Single Sideband Phase Noise Test