Performance Verification 2 3-9 WCDMA/HSDPA Signal Analyzer (Options 44, 45, and 65) Verification
MS2721B MM PN: 10580-00177 Rev. D 3-57
Error Vector Magnitude (EVM) Verification (Options 45 and 65)
The tests in this section can be used to verify the functionality of the WCDMA or HSDPA Demodulator (or
both) of the WCDMA/HSDPA Signal Analyzer in the Spectrum Master Model MS2721B.
Procedure:
1. Turn on the MG3700A Vector Signal Generator and the ML2438A power meter.
2. Connect the power sensor to the power meter and calibrate the sensor.
3. Connect the MG3700A, splitter, attenuator, power meter, and sensor as shown in Figure 3-16
on page 3-52.
4. Press the On/Off key to turn on the MS2721B and wait until the measurement display appears. Then
press the Shift key and the Mode (9) key to activate the mode selection menu.
5. Use the Up/Down arrow keys to select WCDMA and press the Enter key.
6. Press the Shift key, the Preset (1) key, and then the Preset soft key.
7. On the MG3700A, press the Preset key (Yellow key on the upper left-hand side).
8. Press the Down Arrow key to select Yes.
9. Press the Set key (Note that two Set keys are available, and they both do the same thing).
10. Press the (F1) soft key to select "Load File to Memory"
11. Press the (F1) soft key again to select "Select Package"
12. Using the Down Arrow key, step through the selection list until the "W-CDMA(BS Tx test)" option is
highlighted.
13. Press the Set key.
14. Press the (F6) soft key, "Return"
15. Press the Set key.
16. Using the Down Arrow key, step through the selection list until the "TestModel_4_opt" option is
highlighted.
17. Press the Set key.
18. Press the MOD On/Off
key and verify that the Modulation indicator on the display is ON.
19. Press the Frequency key, then enter 1962.5 and press the MHz soft key.
20. Press the Level key, then enter –2 and press the dBm key.
21. Use the knob to adjust the power meter to read –20 dBm.
22. On the MS2721B, press the Freq function hard key, press the Center Freq soft key, enter 1962.5, and then
press the MHz soft key.
23. Press the Measurements function hard key, then press the Demodulator soft key and press the
Modulation Summary soft key.
24. Press the Setup function hard key, then press the Scrambling Code soft key to set it to Auto.
25. Press the Max Spreading Factor soft key to set it to 512.
26. Press the Amplitude key, then press the Adjust Range soft key.
27. Record the EVM reading in Table A-108, “WCDMA Error Vector Magnitude (Test Model 4; Option 45 or
Option 65)” on page A-35, and verify that it is <2.5%.
28. This completes the EVM test for an MS2721B with Option 45 and the first EVM test for an MS2721B
with Option 65.
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