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Chapter 1 Getting Started
Operating the Counter
Operating Guide 1-27
1
NOTE As the graph 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. Once the correction value reaches the zero
axis, no further corrections are applied.
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.
Since there can be no further change in the loss or gain values once the
zero axis is reached, no power corrections are applied when the input
frequency reaches or passes a point in the profile that intersects the zero
axis. Effectively, the Counter computes only loss-correction values or
gain-correction values—never both within the same profile.
When you enter values in power-correction data points and then exit the
data-point display (using either the left-arrow key or the Enter key), the
Counter immediately sorts all of the data-points into order by the
frequency values. Therefore, if you enter a pair of values in a data point,
exit the data-point display, and then immediately return to the display for
that data point, you may see different values than the ones you just
entered. The values you entered may now be contained in a differently
numbered data point in the same profile, if they were previously entered
out of order by frequency.
Increasing Profile Accuracy
To increase the accuracy of a power-correction profile, you can add data
points between the existing data points in the profile (if less than 10 data
points are in use), thus bringing the data points closer together and
shortening the straight-line segments. If all ten data points are in use,
you can add data points by using two or more profiles for a single test
configuration. If you do this, you must select the profile you need (from the
Menu) for the range of frequencies being measured. This means that you
must select a different profile whenever the measured frequency moves
outside the range of frequencies defined by the data points in the
currently selected profile.