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Measurements Operation Verification
MS278XB OM 5-77
Frequency Span Accuracy
The following test can be used to verify that the MS2781B is within its Frequency Span Accuracy
specifications.
Test Setup
Connect the equipment as shown in the figure below:
Test Procedure
1. Set up the instruments as shown in Figure 5-50.
2. Turn on both the MS2781B Signal Analyzer and the MG369XB Signal Generator and allow them to
warm up for one hour.
3. Press the Preset key on the MS2781B to reset the instrument to the factory default state.
4. Set the MS2781B to use External Reference signal.
5. Set the output level of the MG369XB to 6 dBm.
6. Set up the MS2781B as follows:
a. Reference Level: 0 dBm
b. Attenuation: 10 dB
c. VBW: Auto
d. Seep Time Coupling: Accy
e. Center Frequency: 4000 MHz
7. Set Span Frequency and RBW on the MS2781B to the values listed in the next row of Table 5-5.
8. Set the output frequency of the MG369XB to the corresponding F1 value per Table 5-5.
9. Turn on Marker and perform a Marker Peak Search. Record the marker readout value as F1’.
10. Set the output frequency of the MG369XB to the corresponding F2 value per Table 5-5.
11. Perform Marker Peak Search. Record the marker readout value as F2’.
Figure 5-50. Equipment Setup for Frequency Span Accuracy Test