Time Gating - Agilent Technologies 89410A Operator's Manual

Wideband CDMA Concepts (Options B73, B79, and 080)
You can also display the IQ magnitude error, IQ phase error, or the IQ error vector
trace. These error displays show the error between the IQ measured and IQ
reference signals. IQ magnitude error is the magnitude error between these two
signals; IQ phase error is the phase error between these two signals. The IQ error
vector trace is created by computing the error vector from corresponding points in
the IQ measured and IQ reference signals.
Note
For further details about time-domain displays and error parameters, see online
help (press [Help], then press [Measurement Data] and the appropriate softkey).

Time Gating

The Wideband CDMA instrument mode lets you perform time-gating analysis on
demodulated results. Time gating lets you view selected slots within the
measurement. In other words, time gating lets you view a slice of the measurement
results, called the gate.
You use the [ gate length ] softkey to set the width of the gate (in slots). You use the
[ gate delay ] softkey to determine which slot to use as the first slot in the gated
measurement. A gate delay of zero selects the first slot in the measurement; a gate
delay of one selects the second slot, and so forth.
When time gating is on, time gating applies to all code domain, time domain, and
symbol table/error summary displays. For an example of time gating, see To view
data for one or more slots in the chapter titled ''Using Wideband CDMA''.
Tip
When time gating is on, the analyzer adds the word Gate to the trace title to remind
you that the trace does not include all slots in the measurement but, instead, only
includes the slots selected by the gate.
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