500 Keysight N9927-90001 User’s Guide
ERTA (Extended Range Transmission Analysis) Mode - Option 209
Overview
Overview
ERTA uses two FieldFox units to make long-distance scalar, tracking
transmission measurements. One unit is the source and the other unit is the
Receiver.
Communication takes place between the two units with a LAN connection and
hard-wired trigger signals. Once the two units are synchronized, the Receiver
unit becomes the master and measures the output of a DUT, while the Source
unit responds as follower supplying signal at the DUT input. The two units,
possibly separated by hundreds of meters, step together through the selected
frequency range making measurements such as long cable characterization.
With a power splitter at the Source unit, the SA Receiver can be used to
measure the reference signal to make a true B/R ratio measurement. Because
the reference trace is updated on every sweep, there is no need for static trace
normalization. Accuracy is further enhanced with input and output cable
corrections. Furthermore, the alignment process keeps the SA receivers
calibrated. For information on alignments, refer to the SA mode chapter’s
section, “Alignments” on page 180.
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