Agilent Technologies Microwave Oven 53150A 用户手册

Chapter 2  Operating Your Frequency Counter

Operating Guide

2-17

Setting the Number of Averages

You can set the Counter to take a variable number of frequency, power, 
or voltage measurements and average them mathematically before 
displaying the result. You can use this feature to determine the effective 
measurement of a signal that is fluctuating. When measuring the 
frequency of a fluctuating signal, you can also use averaging to retain 
some of the precision of a maximum-resolution measurement. 

The default number of averages is 1, which means that no averages are 
performed, and the maximum setting is 99. Note that the tens position 
(10 through 90) and the units position (0 through 9) are adjusted 
separately, and that it is not possible to set the number of averages to 0.

When a large number of averages is selected for a frequency measurement 
in combination with a high resolution setting (e.g., 1 Hz), it takes a 
considerable amount of time for the Counter to take the measurements, 
compute the averages, and display an initial reading. For example, when 
the number of averages is set to 60, and the resolution is set to 1 Hz, the 
first reading is displayed after 60 seconds (approximately). Subsequent 
computations do not require as much time, since the averaging function 
computes a running average. However, the rate at which the display is 
updated after the initial average computation is also slower than at lower 
resolution settings.

The current averages setting is displayed (the current value and the 
indicator between the arrow keys are flashing to indicate that you can use 
the up- and down-arrow keys to change the setting).

Pwr
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Avg