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S:\Hp8960\E1962B CDMA 2000\Pi Release\Reference Guide\Chapters\cdma2000_hpib_calibration_description.fm
CALibration Subsystem
CALibration Subsystem
Description
There are three calibrations that must be performed periodically on the test set:
• I/Q calibration
• Channel Power calibration
• Digital Average Power calibration
Calibration Procedures
• I/Q calibration
This calibration is required if the Baseband Generator or the Vector Output modules are serviced or
swapped. The CALibration:IQ subsystem should not be used as part of frequent (i.e. daily, weekly or
monthly) test set calibration.
• Channel Power calibration
This calibration generates calibration data for channel power measurements (see “Channel Power
Measurement Description” ), access probe power measurements, and other test set functions.
During calibration the internal temperature of the test set will be measured and calibration data will be
generated that covers the measurement amplitude range of the available frequency bands. During channel
power measurements, the test set will once again measure the internal temperature and calibrate the
temperature measurement that was made when calibration data was generated.
NOTE Channel power calibration data is also used when performing test set functions other than
channel power measurements. Waveform quality measurements are one such function.
• Digital Average Power calibration
Digital average power measurement (see “Digital Average Power Measurement Description” ) calibration
loops back a CDMA signal from within the test set to the average power meter to generate a table of
calibration values.
Digital Average Power measurement calibration takes about ten minutes.
During Digital Average Power calibration no power should be applied to the front panel RF IN/OUT
connector.
Power must be cycled off then back on after this calibration routine has completed.
Channel Power calibration takes about two minutes.
During Channel Power calibration no power should be applied to the front panel.
Remotely initiating any of the calibration routines is accomplished through the use of single query-only
header. The test set returns a numeric value indicating the outcome of the calibration attempt.
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