Agilent Technologies 83236B, Руководство по эксплуатации, Страница: 82 / 164

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Chapter 3, Programming the PCS Interface using GPIB Control
Set Up and Measure
NOTE: Since the level required at the PCS Interface’s FROM DUPLEX OUT port is computed as
a function of frequency, the generator level should be set
after the generator frequency is
set.
Set the analyzer frequency for transmitter testing
The PCS Interface takes the transmitter output signals from the UUT connected to
its RF IN/OUT port and routes the signal to the Test Set’s ANT IN port. Based on
the frequency requested at the PCS Interface’s UUT port, the PCS Interface
automatically determines if the downconversion path or bypass path is used.
1. Use the following command string to set the PCS Interface’s down-converter for the
expected transmitter frequency at the PCS Interface’s UUT port and to query the PCS
Interface for the corresponding frequency to be expected at the Test Set’s ANT IN port.
To the PCS Interface> TX:TSET:FREQ? <test frequency>
( page 120 )
2. Define a local constant for the frequency obtained in step 1.
For example: Ant_freq
3. Use the following command string to tune the Test Set’s RF analyzer frequency to the
UUT’s transmitter frequency.
To the Test Set> RFAN:FREQ <Ant_freq>
NOTE: Table 14 on page 138 in the attached appendix describes the conversions for frequency
automatically made by the PCS Interface.
Set the analyzer attenuation level if you are establishing an active link between the
Test Set and the UUT using over-the-air protocol.
1. If an active link using over-the-air protocol is going to be established between the Test
Set and the UUT, the attenuator may need to be set to a minimum value. This will allow
the Test Set to receive the UUT’s transmitted signal at a high enough level to establish
the link.
Use the following command string to set the attenuator of the PCS Interface’s
analyzer path to 0 dB.
To the PCS Interface> TX:OUTP:ATT 0 dB ( page 118 )