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Measurements Operation Verification
MS278XB OM 5-91
Resolution Bandwidth (RBW) Switching Uncertainty
The following test can be used to verify that the MS2781B is within its RBW Switching uncertainty
specifications.
Test Setup
Connect the equipment as shown in the figure below:
Test Procedure
1. Set up the instruments as shown in Figure 5-57. Turn on both the MS2781B Signal Analyzer and
the MG369XB Signal Generator and allow them to warm up for one hour.
2. Press the Preset key on the MS2781B to reset the instrument to factory default state.
3. Set the output level of the MG369XB to 0 dBm.
4. Set the output frequency of the MG369XB to 100 MHz CW.
5. Set up the MS2781B as follows:
a. Center Frequency: 100 MHz
b. Reference Level: 0 dBm
c. Attenuation: Auto
d. VBW: Auto
e. Sweep Time: Auto
f. Sweep Time Coupling: Accy
6. Set the RBW to 30 kHz and the frequency Span to 10 kHz on the MS2781B.
7. Set the MS2781B to Single Sweep mode and press the Sweep button on the Sweep menu.
8. Turn on Marker 1 and set Marker to Peak.
9. Record the marker level readout value on the display in Table 5-12.
10. Set the RBW and frequency span on the MS2781B to the first settings in Table 5-12.
11. Press the Sweep button on the Sweep menu on the MS2781B.
12. Set the Marker to Peak.
Figure 5-57. Equipment Setup for Resolution Bandwidth Switching Uncertainty Test