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Chapter 8, Programming the Call Processing Subsystem
Using the Call Processing Subsystem’s Remote User Interface
Conditioning the Test Set for Call Processing
It is recommended the control program perform the following steps when first
entering the Call Processing Subsystem (that is, the first time the
CALL CONTROL
screen is selected during a measurement session).
• Zero the RF Power meter to ensure accurate power meter measurements.
There are two reasons for zeroing the RF power meter:
a. When any Call Processing Subsystem screen is displayed (except the ANALOG
MEAS screen) and the Call Processing Subsystem is in the Connect state, the host
firmware constantly monitors the mobile station’s transmitted carrier power. If the
power falls below 0.0005 Watts the error message RF Power Loss
indicates loss of Voice Channel will be displayed and the Test Set
will terminate the call and return to the Active state. Zeroing the power meter
cancels any inherent dc offsets that may be present within the power meter under
zero power conditions. This ensures that the host firmware makes the correct
decisions regarding the presence of the mobile stations’s RF carrier.
b. Zeroing the power meter establishes a 0.0000 W reference for measuring the mobile
station’s RF power at the RF IN/OUT port. This ensures the most accurate RF
power measurements of the mobile stations’s RF carrier at different power levels.
Example
OUTPUT 714;"RFG:AMPL:STATE OFF"
OUTPUT 714;"DISP RFAN;:RFAN:PME:ZERO"
OUTPUT 714;"RFG:AMPL:STATE ON"
NOTE: Ensure that no RF power is applied to the RF IN/OUT port when the power meter is being
zeroed. Set the RFGenerator amplitude to OFF before zeroing the power meter and then
set the RFGenerator amplitude to ON after zeroing the power meter.
• Couple the variable frequency notch filter to AFGen1.
This step is only required if audio testing is to be done on the mobile station. This step
couples the variable frequency notch filter to the output frequency of AFGen1 (audio
frequency generator #1). The notch filter is used when making SINAD measurements.
AFGen1 is used to generate the audio tone for the SINAD measurement. Coupling the
notch filter to the audio source ensures the most accurate measurement.
Commands:
OUTPUT 714;"DISP CONF;:CONF:NOTC ’AFGEN1’"