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Operating Manual 1145.1084.12 – 30 529
measure simultaneously. They can also provide accurate results for signals at inaccurate or
unknown frequencies. A typical example is a mixer measurement with an unknown LO signal (and
therefore unknown IF output frequency).
Power calibration: An external power meter can measure the exact signal power at an arbitrary
point in the test setup (reference plane) and thus provide the reference values for a power
calibration. A typical example is a source power calibration for an arbitrary analyzer port.
Configured external power meters can be selected as additional receivers in the Port Configuration and in
the power calibration dialogs.
To control external power meters via LAN or GPIB interface, it is necessary to install the Virtual
Instrument Software Architecture (VISA) library on the network analyzer. VISA provides the programming
interface between the hardware and the analyzer's application environment.
A suitable VISA library is available from Rohde & Schwarz, see Introduction to Remote Control. Use the
USB-to-IEC/IEEE Adapter (option R&S ZVAB-B44) to control devices equipped with a GPIB interface.
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