Agilent Technologies 53152A, 53150A, 53151A manual Setting the Number of Averages

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Ch 12

Rel Freq

Avg On

Chapter 2 Operating Your Frequency Counter

Setting the Number of Averages

For most of the Counter’s settings, when you continue to press either the up-arrow or the down-arrow key when you reach the end of the available settings, the value for the setting “rolls over” to the value at the opposite end of the range. For example, if the GPIB address is set to 31, and you press the up-arrow key, the value changes to 1. However, when you adjust the value in the units position for the number of measurements to be averaged, rollover does not occur. If you press the up-arrow when the value in the tens position is 0 and the value in the units position is 9, or if you press the down-arrow when the value in the tens position is 0 and the value in the units position is 1, there is no change. If the value in the units position could roll over (in either direction), it would allow you to set a value of 0 for the number of averages. Since at least one measurement must be taken, 0 is an illegal value.

3Press the left-arrow key once to move the focus to the tens position, and then use the up- and/or down-arrow key to set the value for the tens position (if desired).

Note that the tens and units values are set separately.

4Press the Enter key to activate your setting and exit the averages- setting mode.

The Avg On annunciator is activated, and the Counter displays AVERAGING while it takes the first set of measurements. The length of time that the AVERAGING message is displayed varies primarily with setting for the number of averages, since this determines the number of measurements that must be made and averaged before displaying a result. When the first set of averages is complete and the result is displayed, the Counter immediately takes another measurement, discards the oldest measurement included in the current average computation, recomputes the average and displays the new result. This continues until you change the setting for the number of averages or disable averaging (by setting the number of averages to 0).

2-18 Operating Guide