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S:\agilent\e8285\REFGUIDE\MANUAL\fields.chp
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
E
c
/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.