Maximum/Minimum Power Measurement Description

Last updated: October 28, 2004

How is a Maximum/Minimum Power Measurement Made?

The Maximum/Minimum Power measurement, which is actually a firmware routine programmed into the test set, provides an automated way of measuring both the maximum and minimum output power of a CDMA mobile station. It is implemented using a combination of the capabilities of the Average Power measurement (see Digital Average Power Measurement Description ) and the Channel Power measurement (see Channel Power Measurement Description ). The Average Power measurement is used to measure the maximum power of the mobile station, and the Channel Power measurement is used to measure the minimum controlled output power of the mobile station. Both open loop and closed loop power control drive the mobile station's power level up and down. Two power measurement results will be displayed when the measurement is complete.

Maximum/Minimum Power Measurement Parameters

Measurement Timeout - (see Timeouts ).

Maximum Power Setup:

Max Power Meas Cell Power(dBm/1.23 MHz) - (see SETup:CMMPower:POWer:AMPLitude:MAXimum ).
Max Power Meas F-FCH/Traffic Level - (see SETup:CMMPower:TRAFfic:LEVel:MAXimum ).
Max Power Meas Pilot Level - (see SETup:CMMPower:PILot:LEVel:MAXimum ).
The test set will automatically send continuous '0' power control bits (All Up bits) during the maximum power measurement.

Minimum Power Setup:

Min Power Meas Cell Power (dBm /1.23 MHz) - (see SETup:CMMPower:TRAFfic:LEVel:MINimum ).
Min Power Meas F-FCH / Traffic Level - (see SETup:CMMPower:TRAFfic:LEVel:MINimum ).
Min Power Meas Pilot Level - (see SETup:CMMPower:PILot:LEVel:MINimum ).
Min Power Meas Receiver Power Control - (see SETup:CMMPower:RFANalyzer:AUTO:MINimum ).
Min Power Meas Receiver Power - (see SETup:CMMPower:RFANalyzer:POWer:MINimum ).
The test set will automatically send continuous '1' power control bits (All Down bits) during the minimum power measurement.
The test set will automatically set the Call Drop Timer to Off during the minimum power measurement.

NOTE

The test set will temporarily use the parameters set from the Maximum Power Setup menu ( Maximum Power Setup: ) for the maximum power measurement, use the parameters set from the Minimum Power Setup menu ( Minimum Power Setup: ) for the minimum power measurement. When the measurement is finished, the test set returns to its pre-measurement settings (including Cell Power, F-FCH/Traffic Level, Pilot Level, Receiver Power Control, Reverse Power Control mode, and Call Drop Timer) which are set from the


Call Parms

menu (see How Do I Change Call Parameters? ).

Maximum/Minimum Power Measurement Results

Integrity Indicator - (see Integrity Indicator and FETCh:CMMPower[:ALL]? ).
Maximum Power Result (dBm) - (see FETCh:CMMPower:MAXPower? )
Minimum Power Result (dBm/1.23MHz) - (see FETCh:CMMPower:MINPower? )

A typical measurement result is shown below:

Input Signal Requirements

The Maximum/Minimum power measurement meets specifications when the following input signal requirements are met:

The frequency of the signal being measured must be within the range of 412 MHz to 483 MHz, 800 MHz to 960 MHz, or 1.7 GHz to 2.0 GHz, and be within 100 kHz of the expected frequency.
The signal level into the test set's RF IN/OUT connector must be between -61 dBm to +37 dBm. The test set can autorange to a signal that is within +/- 9 dB of the expected input level (see RFANalyzer:AUTO:POWer[:SELected]? ).

Key TIA/EIA-98-E Tests Performed Using the Maximum/Minimum Power Measurement

Testing 4.4.5 Maximum RF Output Power and 4.4.6 Minimum Controlled Output Power

Calibrating the Maximum/Minimum Power Measurement

The maximum power measurement is automatically calibrated during a digital average power calibration. The minimum power measurement is automatically calibrated during a channel power calibration.

To properly calibrate the maximum/minimum power measurement, you need to perform the digital average power calibration first, then make the channel power calibration. Refer to Calibrating the Test Set for details of digital average power calibration and channel power calibration.