Anritsu MT8212E - Page 148

3-5 Demodulator W-CDMA/HSPA+ Signal Analyzer
3-18 PN: 10580-00234 Rev. T 3GPP MG
6. Press the IQ Persistence submenu key and use the keypad or rotary knob to set the
IQ Persistence to 2. The instrument will display the constellation diagram after the
first sample, and then update the constellation diagram after the second sample.
IQ Persistence can be set as high as 48. When the maximum is reached, the first
sample is replaced.
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 measurements table.
Codogram Setup
Codogram displays the code power levels over time. Two graphs are displayed on the screen,
the top one displays all the selected OVSF codes and the bottom one displays the selected
OVSF zoom codes.
Codogram 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. 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.
5. 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.
6. 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.
7. Press the Threshold submenu key to manually set the Threshold level which determines
which codes are active. The default value is –30dB.
8. Press the Measurements main menu key.
9. Press the Demodulator submenu key to list the Demod menu.
Note
The W-CDMA modulation type is QPSK, and the HSPA+ modulation is 16QAM or
QPSK.
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/HSPA+ measurements.