S820E UG PN: 10580-00343 Rev. H 3-33
Cable and Antenna Measurements 3-7 Measurement Setup
Sweep Averaging
This function sets the trace averaging process to use the measurement values
of the same point in a set number of sweeps (refer to “Data Points”
on page 3-30). For settings greater than 1, the Measurement Information
displays the current sweep number (since entering the setting) followed by
the setting value. For example, if you set the averaging value to 100, then you
would see the first number counting from 1 up to 100 as the sweeps are
completed. Thereafter, the values would be displayed continuously as
100/100.
A Sweep Averaging setting of 1 means that only one point is used in the
averaging calculation, which means that no averaging is being done. The
Averaging value that is displayed in the Measurement Information area
(item 14 in Figure 2-6 on page 2-14) is “--” when Sweep Averaging is set to 1.
Source Power
The RF power radiated from Port 1 or Port 2 can be adjusted to be either
High (nominally –3 dBm) or Low (nominally –20 dBm). The High power
setting (default) is optimized in order to maximize the dynamic range of the
measurement. The Low power setting must be used whenever the device
under test cannot be operated with high power input signals, such as with
high gain amplifiers. Care must be taken when making a transmission
measurement on an amplifier in order to prevent damage or excessive
distortion in the amplifier under test. Take extra caution to ensure that the
output of the amplifier under test does not exceed the maximum rated input
to the ports on the S820E analyzer.
IFBW
The Intermediate Frequency Bandwidth (IFBW) setting allows users to
optimize instrument measurement speed versus dynamic range performance.
Lower IFBW values provide higher dynamic range at the expense of
measurement speed. Higher IFBW settings provide faster measurement
speed at the expense of dynamic range. The default setting is 1 kHz,
maximum is 100 kHz, and minimum is 10 Hz.
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