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HPB\HPA User Manual
4.5 COMMAND ILLUSTRATIONS
The figures below illustrate the commands that affect the pressure output rate. Figure 4.5 shows a varying pressure
signal having a reading integration time of 200 msec. If the small variations on the pressure signal are considered
noise and are undesirable, increase the integration time to time-average the pressure signal, and filter out the noise.
Figure 4.6 shows the same pressure signal with a 1 second integration time reducing the noise variations on
the output readings. Of course, the penalty for doing this is reducing the response time to rapidly changing
pressures that are not considered noise.
Figures 4.7 and 4.8 illustrate rapid pressure changes using the S2 and S5 commands. The Speed Shift
commands (S2, S5) allow the tracking of rapid changes while sampling less often when pressures are slowly
changing. A threshold is set independently for the S2 and S5 commands that tell the HPB when to begin
outputting samples at the higher rate. The S2 command causes the output rate to double. The S5 command
causes the readings to be output at 50 msec intervals synchronous with the normal reading rates.
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Figure 4.5—Integration (I=) Command, Example 1
Figure 4.6—Integration (I=) Command, Example 2
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