Anritsu Series MS278XB - Manual (Page 241)

Measurements Operation Verification
MS278XB OM 5-85
5. Press the Sweep button from the Sweep menu and allow averaging to complete.
The display should look similar to that below:
6. Record the average displayed noise level in Table 5-9 and verify that it meets the specification.
7. Set the Center Frequency of the MS2781B to the next Center Frequency listed in Table 5-9.
8. Press the Sweep button on the Sweep menu and allow averaging to complete.
9. Record the displayed noise level in Table 5-9 and verify that it meets the specification.
10. Repeat steps 7 through 9 for the rest of the center frequencies in Table 5-9.
Figure 5-54. Displaying the Average Noise Level