Chapter 3 — Options Verification 3-5 Option 881 WCDMA/HSDPA Signal Analyzer Verification
MS2720T MM PN: 10580-00342 Rev. D 3-21
Error Vector Magnitude (EVM) Verification
The tests in this section can be used to verify the functionality of the WCDMA Demodulator or the HSDPA
Demodulator (or both) of the WCDMA/HSDPA Signal Analyzer in the MS2720T Spectrum Master.
WCDMA EVM Verification Procedure
1. Turn on the MG3700A Vector Signal Generator and the ML2438A power meter.
2. Connect the power sensor to the power meter and zero the sensor.
3. Connect the MG3700A, splitter, attenuator, power meter, and sensor as shown in Figure 3-7.
4. Press the On/Off key to turn on the MS2720T, and wait until the measurement display appears.
Then press the Shift key, and then press 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 submenu key.
7. On the MG3700A, press the Preset key (Yellow key on the upper-left corner).
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) submenu key to select “Load File to Memory”.
11. Press the (F1) submenu key again to select “Select Package”.
12. Using the Down Arrow key, step through the selection list until the WCDMA(BS Tx test) option is
highlighted.
13. Press the Set key.
14. Press the (F6) submenu 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 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 MS2720T, press the Center Freq main menu, enter 1962.5, and then press the MHz submenu key.
23. Press the Measurements main menu key, then press the Demodulator submenu key and press the
Modulation Summary submenu key.
24. Press the Setup main menu key, then press the Auto Scrambling submenu key to turn it On.
25. Press the Max Spreading Factor submenu key to set it to 512.
26. Press the Amplitude main menu key, then press the Adjust Range submenu key.
27. Record the EVM reading into Table A-88, “Demodulation, WCDMA Error Vector Magnitude
(Test Model 4)” on page A-43 and verify that it is within ±2.5%.
HSDPA EVM Verification Procedure
1. On the MG3700A, press the Preset key (Yellow key on the upper-left corner).
2. Press the Down Arrow key to select Yes.
3. Press the Set key (Note that two Set keys are available, and they both do the same thing).
4. Press the (F1) submenu key to select “Load File to Memory”.
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