Agilent Technologies 83236B, Руководство по эксплуатации, Страница: 67 / 164

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Chapter 3, Programming the PCS Interface using GPIB Control
Overview of Programming Issues
Overview of Programming Issues
Features
The basic features of the PCS Interface include:
• A PCS frequency RF generator for receiver testing
• A PCS frequency signal analyzer for transmitter testing
• A power detector for direct power measurements
• A temperature sensor for accuracy compensations
The PCS Interface takes the signal generated by the Test Set (810 to 995 MHz) at
its FROM DUPLEX OUT port and upconverts it to a PCS frequency band
(1710 to 1785 MHz, 1805 to 1910 MHz, or 1930 to 1990 MHz) signal at the unit-
under-test (UUT) port.
Conversely, the PCS Interface takes the UUT’s transmitted signal (1710 to
1785 MHz, 1805 to 1910 MHz, or 1910 to 1990 MHz), downconverts it to a
frequency the Test Set is capable of analyzing (650 to 940 MHz), and applies it to
the Test Set’s ANT IN port. Both the PCS Interface’s generator and analyzer
paths include variable attenuators for controlling signal levels in the Test System.
The power detector inside the PCS Interface provides direct measurements of the
UUT’s transmitter power.
In order to provide the best possible accuracy and confidence in measurements,
the PCS Interface has built-in temperature sensing circuitry which is used to
determine whether re-calibration is needed. Three compensations are available for
re-calibration and will be discussed in detail later in this chapter.