Specifications

Section 4. Sensor Support
4-13
Settling Time
0.036
0.037
0.038
0.039
0.04
0.041
0.042
0.043
0.044
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Time (x100 us)
mV/Volt
85
87
89
91
93
95
97
99
% of Final Value
Series1
Series2
Series3
Series4
Series5
Average %
FIGURE 4.2-2. Settling Time for Pressure Transducer
TABLE 4.2-8. First Six Values of Settling Time Data
TIMESTAMP RECORD PT(1) PT(2) PT(3) PT(4) PT(5) PT(6)
Smp Smp Smp Smp Smp Smp
1/3/2000 23:34 0 0.03638599 0.03901386 0.04022673 0.04042887 0.04103531 0.04123745
1/3/2000 23:34 1 0.03658813 0.03921601 0.04002459 0.04042887 0.04103531 0.0414396
1/3/2000 23:34 2 0.03638599 0.03941815 0.04002459 0.04063102 0.04042887 0.04123745
1/3/2000 23:34 3 0.03658813 0.03941815 0.03982244 0.04042887 0.04103531 0.04103531
1/3/2000 23:34 4 0.03679027 0.03921601 0.04022673 0.04063102 0.04063102 0.04083316
4.2.7 Self-Calibration
The CR1000 is equipped to routinely self-calibrate to compensate for changes
in calibration induced by fluctuating operating temperatures and aging.
Without self-calibration, measurement accuracy over the operational
temperature range is worse by about a factor of 10. That is, over the extended
temperature range of -40°C to 85°C, the accuracy specification of ±0.12% of
reading can degrade to ±1% of reading with the self-calibration disabled. If the
temperature of the CR1000 remains the same, there will be little calibration
drift with self-calibration disabled.
Unless a Calibrate() instruction is present in the running CRBASIC program,
the CR1000 automatically performs self-calibration during spare time in a slow
sequence (background), with a segment of the calibration occurring every 4
seconds (s). If there is insufficient spare time to do the background calibration
because of a consuming user program, the CR1000 will display the following
warning at compile time: “Warning when Fast Scan x is running background
calibration will be disabled”.