The Code Domain Power (CDP) display includes spreading factor (OVSF codes) 256 or 512 with zoom in on codes. The instrument can zoom to 32, 64 and 128 codes and the user can input the zoom code to start the zoom in from the entered OVSF codes. The demodulator also displays CPICH, P‑CCPCH, S‑CCPCH, PICH, P‑SCH and S‑SCH power in the table format. For W-CDMA/HSDPA Demodulator, the HSDPA codes are also displayed.
Code Domain Power (CDP) Procedure
1. Set the measurement frequency using one of the methods listed in the User Guide.
2. Press the Setup main menu key.
3. Press the Scrambling Code submenu key to select Auto so that the scrambling code is automatically detected.
4. The instrument has automatic external reference frequency detection or, if equipped, activate GPS and synchronize the instrument to High Internal accuracy.
5. Connect the external reference to the RF In BNC connector and wait for the unit to recognize the external reference and lock up to it. Refer to the User Guide for additional information.
6. Press the S‑CCPCH Spread submenu key to manually set the S‑CCPCH spreading. The default S‑CCPCH spreading factor of 256 will be displayed in all the views. Set the S‑CCPCH spreading factor to show accurate results.
7. Press the S‑CCPCH Code submenu key to enter the correct S‑CCPCH code. The default S‑CCPCH code of 3 will be displayed in all the views. Set the S‑CCPCH code to show accurate results.
8. Press the PICH Code submenu key to enter the correct PICH code. The default PICH code of 16 will be displayed in all the views. Set the PICH code to show accurate results.
9. Press the Threshold submenu key to manually set the Threshold level which determines which codes are active. The default value is – 30 dB.
10. Press the Measurements main menu key.
11. Press the Demodulator submenu key to activate the demodulator menu.
12. Press the CDP submenu key to activate the CDP measurement.
13. If needed, press the CDP key again to activate the zoom function.
14. Press the Zoom submenu key to select the appropriate zoom level. The Zoom key toggles between 32, 64, and 128.
15. Press the Zoom Start submenu key to manually enter the zoom start code.
16. Press the Back submenu key to go back to the CDP measurement.
Note
The blue color block on the CDP screen represents the selected zoom codes and the same codes are displayed in the zoom screen.
CDP Measurement Summary
Activating Markers
1. Press the Marker main menu key to display the Marker menu.
2. Press the Marker submenu key to select the appropriate marker (1 through 6). The underlined marker number is the currently selected marker.
3. Press the On/Off submenu key to activate the selected marker.
4. Press the Marker Table submenu key to display the Marker table. The marker table is displayed on the screen below the CDP measurements table.
Note
Markers can be used to read the individual code power, symbol EVM (@ EVM) and type of code and can be activated in all the W-CDMA/HSDPA measurements.
