Chapter Four: Functional Overview
The [SETUP] Key
51
Averaging
Ch 1
760 Torr
Averaging: 20
This screen displays the averaging entry that defines number of readings the 670 instrument will
average to establish the pressure reading. By averaging multiple data points, you can smooth the
pressure signal from an unstable system.
Note
The averaging feature only effects the displayed pressure reading and the
value reported by the remote communications. It does not effect the
pressure output signal.
To utilize averaging for the remote communications, refer to Chapter Six: RS-232
Communications Option, page 85, for more information about RS-232 commands, or Chapter
Seven: IEEE-488 Communications Option, page 103, for information on the IEEE-488
command.
How Averaging Works
The averaging feature employs a moving average, continually dropping the oldest data point and
adding the latest data point. The sampling rate is fixed at 10 samples per second. Figure 11
shows how the 670 instrument computes an average of 5 data points.
Figure 11: Averaging with 5 Data Points
A new data point is read every tenth of a second (a fixed sampling rate of 10 samples per
second). The first average represents the average of the following 5 data points:
52
53
52
57
53
267 ÷ 5 = 53.4
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