Keysight E4990A - Averaging Function

E4990A Help
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number specified by the Avg Factor key, it stays constant while
sweeping continues.
Making Sweep Averaging Measurement with Single Trigger
The averaging trigger function is used to execute the sweep the number of
times specified by the averaging factor with a single trigger when the
sweep averaging function is ON.
Averaging
Trigger
Function
ON
Performs the sweep the number of times specified by
the averaging factor with a single trigger.
OFF
Performs the sweep once with a single trigger.
The averaging factor is cleared before the start of measurement.
When the point trigger function is ON, its setting has
priority, and you need to generate triggers based on "(number
of measurement points) × (averaging factor)". When the
sweep averaging function is OFF, sweep is performed only once
even if the averaging trigger function is set to ON.
Setting Averaging Trigger Function
When the sweep averaging function is ON, follow these steps to set the
averaging trigger function.
1. Press Avg to display the Averaging menu.
2. Press Avg Trigger and select ON to activate the averaging trigger.
Executing Averaging Measurement
1. Press Trigger.
2. Press Single. The averaging factor is cleared before the start of
measurement, the sweep is executed the number of times specified
by the averaging factor, and then the instrument waits for the next
trigger.
Averaging for Each Measurement Point (Point Averaging)
Point averaging averages each data point by a user-specified averaging
factor. The Agilent E4990A repeatedly measures the same point until the
averaging factor is reached. It then divides the vector summation of the
measurement value by the averaging factor and starts measuring the next
point. The sweep time increases in proportion to the averaging factor.
The algorithm used for point averaging is shown below: