Agilent Technologies E8285A manual Mic Pre-Emp, Queries the Min Power measurement value

Chapter 4, Description of Fields

Fields

Mic Pre-Emp

Microphone pre-emphasis determines whether the modulating signal from the MIC/ACC connector goes through or bypasses the 750 ms pre-emphasis network. Two fields are used:

•The upper field is used to specify whether you want the instrument to automatically turn pre-emphasis on during FM operation and off for other modulations (Auto), or to leave the pre-emphasis switching to the user’s operation (Hold).

•The lower field tells you whether pre-emphasis is on or off (when Auto operation is selected), or allows you to manually turn pre-emphasis on or off (if Hold is selected).

Screens Where Field is Present

RF GENERATOR

Min Power

The value shown under the Min Power label in the upper left portion of the display is the minimum power measurement result obtained the last time a Min/ Max Power measurement was executed.

GPIB Example

“DISP CTXR;MEASure:CDManalyzer:MMPower:[EXECute]”

executes a Min/Max Power measurement.

“DISP CCNT;CDMA:MOBile:POWer:MINimum?“

queries the Min Power measurement value.

Operating Considerations

While a mobile station is on a call, the mobile station’s range of power levels can be obtained by selecting the Execute field under the Min/Max Pwr label. Before Min/Max Power is executed, make sure that the Average Power measurement is zeroed, and the Channel Power measurement is calibrated. (Refer to “Calibrating the Test Set” chapter in the E8285A Application Guide, if you do not know how to zero Average Power measurements and calibrate Channel Power measurements).

The Test Set will measure the mobile station’s minimum power first. Using a procedure that closely follows the EIA/TIA IS-98 test “Minimum Controlled Output Power”, the Test Set sets Sector A power to -3535 dBm/BW and Traffic Ec/Ior to -7.4, then sends “Always Down” power control bits to drive the mobile station to its minimum power level. A Channel Power measurement is made, and the Test Set is returned to closed loop power control mode.

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