Averaging; If Bandwidth - Keysight N9923A FieldFox User Manual

Averaging

Averaging helps to reduce the effects of random noise on a measurement. You
specify the number of measurements to be averaged. The more measurements
averaged, the greater the amount of noise reduction. An average counter is shown in
the left edge of the screen as Avg <n> where <n> is the number of measurements
that are averaged.
Averaging can be set before or after calibration. When set before calibration, each
calibration standard is measured <n> times and averaged. More time is needed to
perform the calibration, but there will be less noise in the resulting error terms which
means that subsequent measurements will also have less noise. In addition, noise is
further reduced by continuing to average after calibration.
How to set Averaging
 Press BW 2.
 Then
 Enter a value using the numeric keypad. Enter 1 for NO averaging.
 Press Enter.
 Then
 While averaging is in process, press Sweep 3 then

IF Bandwidth

The FieldFox converts the received signal from its source to a lower intermediate
frequency (IF). The bandwidth of the IF bandpass filter is adjustable. Reducing the IF
receiver bandwidth reduces the effect of random noise on a measurement. However,
narrower IF bandwidths cause longer sweep times.
How to set IF BW
 Press BW 2.
 Then
 Then choose from the following:
NA (Network Analyzer) Mode
where <n> is the number of measurements to average.
Average <n>
Choose from the following:
Average Mode
Sweep - Each data point is based on the average of the same data point being
o
measured over <n> consecutive sweeps. The average counter shows the number
of previous sweeps that have been averaged together to form the current trace.
When the counter reaches the specified count, then a 'running average' of the
last <n> sweeps is displayed.
Point - Each data point is measured <n> times and averaged before going to the
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next data point. On subsequent sweeps, averaging restarts by measuring each
data point again <n> times. The average counter is not updated because data is
not displayed until all the averages have been applied.
Point averaging is usually faster than sweep averaging. However, you may need
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to increase the Point Average count to obtain the same level of noise reduction
as with sweep averaging.
averaging at 1.
IF BW
Restart
300 Hz | 1 kHz | 3 kHz | 10 kHz | 30 kHz
to restart the
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