Theory of Operation
Software
2
2-9
2-6.bmp
Figure 2-6. Menu | Display-Menu
Pressure Reading and Correction
The sensor’s analog output is processed by an analog-to-digital circuit that results in an
output referred to as counts. This output is corrected for the applied effects listed below.
The counts are linearized and the resulting pressure value is corrected for the variations in
head pressure, vacuum, case effect, and oven temperature effects.
The following equations are used by the control algorithm to adjust and correct the
pressure signal.
Zero Coefficients
CsH
Zero correction for High FSR (Full-Scale Resistors) Value is in counts
(7,381,975 = full scale of current sensor).
CsL
Zero correction for Low FSR. Value is in counts (7,381,975 = full scale
of low FSR)
HsZ
Hardware zero correction. (0 to 4095, center is 2048).
SsZ
Zero corrections scaling factor. Ratio of High FSR to Low FSR. Used only when
Case Effect Coefficient or Oven Temperature Coefficient are non-zero.
s=0 for high range sensor, s=1 for low range sensor.
Range Coefficients
KnF 0=Range
Unused
4=Valid High FSR Range
5=Valid Low FSR Range
Kn0, Kn1, Kn2 Calibration constants for range
0
24
1
2
48
2
*
2
*
2
n
n
n
K
A
K
A
K
B
+
+
=
Where A is the zero corrected counts (7,381,975 = full scale of current range) and
B is the calibrated counts (7,381,975 = full scale of current sensor)
Summary of Contents for RUSKA 7050
Page 3: ...7050 Change Language Hold key for 5 seconds mode enter...
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Page 10: ...RUSKA 7050 7050i 7050LP Users Manual vi...
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