Operating Your Frequency Counter 2
Keysight 53150A/151A/152A Operating Guide 93
Power Correction Theory of Operation
When the Counter interpolates between data points to determine the amount of
correction to apply to the current measurement, it computes the correction based
on a straight line plotted between the frequency values in the two closest data
points. Therefore, a graph of a power-correction profile would show a “curve” that
consists of two to nine straight-line segments, rather than a true curve, as shown
below.
As the graph above shows, the Counter never computes power-correction values
for loss above the zero axis. Conversely, corrections are never computed for gain
below the zero axis. When the Counter interpolates for frequencies that are above
or below the range of frequencies specified in the currently selected profile, it
never computes a value that would fall on the opposite side of the zero axis from
the closest specified frequency. In other words, if there are two or more data
points that contain loss values, the Counter never computes or applies a
correction that would be indicative of gain. Conversely, if there are two or more
data points that contain gain values (negative loss values), the Counter never
applies a correction that would be indicative of loss.
P
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F r e q u e n c y
NOTE
When the frequency value of a signal is beyond either end of the curve specified
by the values in the currently selected profile’s data points, the Counter
computes a correction by extending the straight line defined in the last two data
points in the profile.
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