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S:\Hp8960\E1962B CDMA 2000\Pi Release\Reference Guide\Chapters\cdma2000_conf_meas.fm
Measurement Related Configuration
Measurement Related Configuration
Description
Amplitude offsets compensate for loss or gain between the test set’s RF IN/OUT front panel connector and the
mobile station’s RF connector.
To access the amplitude offset feature, press the SYSTEM CONFIG key, followed by the RF IN/OUT Amptd
Offset key, F5.
Amplitude offset settings are preserved during power cycles or instrument preset.
Setting Up Amplitude Offsets and Frequency Points
Up to 20 frequency points can be assigned an amplitude offset. Negative amplitude offset values should be
entered when there is a loss through the RF cabling and test fixtures and positive values should be entered
when there is a gain.
The RF IN/OUT Amplitude Offset table displays the current (on/off) state of the amplitude offset feature.
There are also 20 rows for entering frequencies and 20 rows for entering corresponding offset values. To enter
values in the table use the RF IN/OUT Amplitude Offset Setup menu.
To set up amplitude offsets remotely, one comma-separated string is sent to set up frequency points and
another comma-separated string assigns the corresponding amplitudes.
GPIB Commands
OUTPUT 714;”SYSTEM:CORRECTION:SFREQUENCY 1710.2 MHZ,1805.2 MHZ,1784.8
MHZ,1879.8 MHZ”
!sets the first 4 frequencies in the amplitude offset table.
OUTPUT 714;”SYSTEM:CORRECTION:SGAIN -2.55,-3.12,-3.68,-4.23”
!sets the first 4 amplitude offsets in the amplitude offset table.
Turning amplitude offsets on/off
When the RF IN/OUT Amplitude Offset State is on, all offsets that are not individually turned off are applied
and the word “Offset” appears in the Instrument Status Area of the test set’s display.
If the RF IN/OUT Amplitude Offset State is off, none of the amplitude offsets are applied.
GPIB Command
OUTPUT 714;”SYSTEM:CORRECTION:STATE ON”
!Sets the RF IN/OUT Amplitude Offset State to On
NOTE If the RF IN/OUT Amplitude Offset State is turned off , none of the amplitude offsets are on,
even if values are entered for the individual offsets.
Examples of Amplitude Offset Behavior
When the amplitude offset table entries accurately represent the loss in all components (cabling, connectors,
and test fixturing) in the signal path between the test set and the mobile station, the test set will make the
necessary adjustments in both receiver and transmitter measurements.
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