Agilent Technologies 53151A, 53152A, 53150A Increasing Profile Accuracy, Power Correction Examples

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Chapter 2 Operating Your Frequency Counter

Using Power Correction

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.

Power Correction Examples

The procedures for using Power Correction and entering loss (or gain) and frequency values in power-correction profiles are demonstrated in the Power Correction examples on the following pages. The first example, on page 2-33, shows how to select a power-correction profile and enable Power Correction and also shows how to disable Power Correction.

The second example, on page page 2-35, shows how to enter data in the power-correction profiles.

2-32 Operating Guide