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Keysight E4990A
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Measurement
87
2. Press Meas Time and select the desired measurement speed time.
The available options are 1|2|3|4|5 with 1 being the fastest time
(maximized speed) and 5 being the most precise (accuracy
maximized).
Setting a greater measurement time will improve
measurement accuracy, but keep in mind that this requires a
longer measurement time.
Averaging Between Sweeps (Sweep-to-Sweep Averaging)
Sweep-to-sweep averaging computes each data point (vector value) based
on an exponential average of consecutive sweeps weighted by a user-
specified averaging factor. The sweep-to-sweep uses the algorithm shown
below:
Perform the averaging factor setup as follows:
1. Press Avg to display the Averaging menu.
2. Press Avg Factor and input the desired averaging factor value.
The sweep-to-sweep averaging can be set to any
natural number from 1 to 999. Setting the sweep-to-sweep
averaging to 1 is equivalent to turning the averaging OFF
(Averaging > OFF).
3. Press Averaging and toggle between the ON|OFF selection to turn
ON/OFF the sweep-to-sweep averaging factor.
When the sweep-to-sweep averaging is turned ON,
the value of sweep-to-sweep averaging that has been
performed for the trace is shown on the instrument status bar.
The sweep-to-sweep averaging starts once its turned ON
(Averaging > ON) or after pressing the Averaging Restart key.
When the averaging starts, “0” is displayed for the averaging
count because the number of traces (sweep data) to be swept
is always set to 0 at the initial state. Then the count increases
by 1 as each sweeping ends. After the count reaches the

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