Agilent Technologies 83236B, Operating Manual, Page: 85 / 164

85
Chapter 3, Programming the PCS Interface using GPIB Control
Set Up and Measure
Activate the
UUT
Activate the RX and/or TX functions of the UUT.
NOTE: You need to determine the steps required here. You can either control the UUT with the
Test Set’s call processing capabilities or some other means of direct control.
Set the TX
Attenuator Level
(for TX testing)
The PCS Interface is designed to optimize the level of the signal passed to the
Test Set’s RF analyzer. With a single GPIB command, the PCS Interface will
automatically adjust its analyzer path attenuation. This should be performed after
the active signal is connected to the RF IN/OUT port.
1. Use the following command string to set the PCS Interface’s analyzer path attenuation
to obtain the optimum signal level into the Test Set’s ANT IN port and to query for
completion.
To the PCS Interface> TX:OUTP:LEV:ADJ; *OPC? ( page 119 )
NOTE: Do not have a signal generator level greater than
−
50 dBm at the RF IN/OUT port when
adjusting the attenuator level. This may require that you reduce the level of the signal
generator.
NOTE: This is a one time setting and does not place the PCS Interface in an auto-ranging mode. If
the TX signal level changes, the attenuation setting command should be sent again.
The optimum level out of the PCS Interface’s TO ANT IN port can be modified using the
TX:OUTP:LEV
command, and the
TX:OUTP:RFAN:PATH:IL?
command can return
the path loss from the RF IN/OUT port to the TO ANT IN port
.
These two commands can
be used to develop custom attenuator setting procedures in the controlling software which
can be used if a known signal level will be connected to the RF IN/OUT port.
Since the attenuator setting is a function of frequency, the analyzer’s attenuator should be
adjusted
after the analyzer’s frequency is set.