Electromagnetic Field (EMF) MeasurementsOption 444 : W-CDMA OTA : W‑CDMA EMF Menu
Key Sequence: Measurements > OTA > EMF
W-CDMA EMF Menu (1 of 2)
Measurement On/Off: Starts the EMF Measurement and removes access to all other menu buttons. The measurement turns On only if the Center Frequency is set within the valid range and the Anritsu Isotropic Antenna is connected.
Note that the Measurement Time and other related parameters must be set before starting the measurement. This button is useful for stopping or restarting measurements when settings need to be changed. When the measurement is in progress, access to other menus and key presses are blocked.
Measurement Time: Sets the duration of each EMF measurement from one minute up to 30 minutes. The default is 6 min. The instrument captures over-the-air data for the X axis when a sync signal is found and there is a valid scrambling code, then moves to the Y and Z axes. There is no axis dwell time parameter. You will get as many isotropic results for the set of three axes as can be obtained within the specified Measurement Time.
When no valid sync signal is found for the current axis, data captured for this axis will be excluded from the measurement results and the instrument moves to the next axis. Refer to Measurement Results (W-CDMA).
Number of Measurements: Sets the number of EMF measurements to complete from 1 up to 10,000. The EMF test is fully executed when the specified number of measurements have completed.
W-CDMA EMF Menu (2 of 2)
Auto Logging On/Off: Auto Logging is On by default. This must be selected prior to starting the measurements for the results to be logged. The PCPICH (Primary Common Pilot Channel) and Field Strength actual and average values of the current measurement are stored. The maximum, minimum, and total average values stored are not per measurement, but for all the values captured until that point.
The location of the saved log file is a new folder named with the current time stamp followed by _1, and created in “/Internal Memory/EMF/”. The folder can hold 100 files. Each file holds five measurements. The 101st file and the files created thereafter are stored in a new folder with the same time stamp as the first, followed by _2 (then _3, and so on). Each file has its own time stamp.
Measurement Parameters: Opens the Meas Params Menu (W‑CDMA).
EMF Units: The unit choices are dBm/m2, V/m, W/m2, % of Limit (V/m), and % of Limit (W/m2). V/m is the default unit.
% of Limit (V/m) and % of Limit (W/m2) display the measured numbers as a percentage of the selected limit. The submenu key shows the currently selected EMF unit. If the selected base unit is in V/m or % of Limit ( V/m), the averaging over the selected period is done in Volt units; if any of the other units are selected, the measurements are performed in power (Watt) units. If you change the EMF units at the end of the measurement, the values displayed are converted from the base units used during the measurement.
Limits: A single number can be entered. The Field Strength (Avg) value should stay below this limit (default 6 V/m) for the test to pass.
Back: Returns to the previous menu.
Meas Params Menu (W‑CDMA)
Key Sequence: Measurements > OTA > EMF > Measurement Parameters
W-CDMA Meas Params Menu
Scrambling Code: Press this key to toggle between Auto or Manual scrambling code. Auto scrambling code determines the scrambling code automatically.
The choice of Auto or Manual scrambling codes and the code lock/reset options function in the same manner as Scrambling Code in W‑CDMA OTA measurement mode.
Manual Code: Press this submenu key to select a scrambling code index, 1 through 6. The key is active only in Manual mode, which is selected using the Scrambling Code submenu key.
On Off: Switches On/Off the manual codes.
Display Params: Opens the Display Menu. Enter this submenu to select the parameter you want displayed in the rightmost column of the measurement results table.
Extr Factor: The extrapolation factor, when turned On (> 1), displays the extrapolated P‑CPICH numbers. The field strength values are not extrapolated.
This parameter can be set between 1 and 100 (the network operator can provide this number). It can be used to provide a safety margin in case of an increase in transmit power from an LTE station. The fine tuning may be based on operator input (system setup/power ratio) and/or per regulatory requirements (margins). Refer to Measurement Results (W-CDMA).
Back: Returns to the W‑CDMA EMF Menu.
Display Menu
Key Sequence: Measurements > OTA > EMF > Measurement Parameters > Display Params
W-CDMA Display Menu
Press one of the keys in this submenu to select which parameter is displayed in the rightmost column of the measurement results table. The default selection is Total Avg. See Figure: W-CDMA EMF Measurement Results.
The parameter to be displayed can be changed at the start or at the end of the measurement cycle. All the parameters are always computed and stored. Once the measurement is complete, any parameter can be viewed in the desired units and with the desired extrapolation factor.
Total Min is the minimum value computed from all measurements completed thus far within the measurement period (Measurement Time × Number of Measurements).
Total Avg is the average value computed from all measurements completed thus far within the measurement period.
The remaining choices are coverage measurements computed as a ratio of common pilot signal to the channel power (5 MHz bandwidth):
Actual/Field Str
Max/Field Str
Avg/Field Str
Min/Field Str
Total Avg/Field Str
Back: Returns to the Meas Params Menu (W‑CDMA).