Instruction Manual VGC301 Controller
InstruTech, Inc.
Page 33
7.8
NONLIN 9V; Non-Linear Analog Output Equations & Table
You may calculate the pressure represented by the NONLIN 9V,
0 to 9 V
non-linear analog output voltage for the “S-curve”
using a multi-segment, n
th
order polynomial function calculation. Use the coefficients listed in the table below to calculate
pressure using the following equation:
P = K
0
+ K
1
(454.67*V
1
)+ K
2
(454.67*V
1
)
2
+ K
3
(454.67*V
1
)
3
Where P=Pressure in Torr, V
1
= Analog output voltage
Coefficients
for voltage segment range of
0 to 1.8457 volts
K
0
K
0
= +0.00
K
1
K
1
= +1.428571E-04
K
2
K
2
= +2.551020E-07
K
3
K
3
= +9.110787E-11
Coefficients
for voltage segment range of
1.8457 to 3.1641 volts
K
0
K
0
= -2.681040E-01
K
1
K
1
= +9.758000E-04
K
2
K
2
= -5.950000E-07
K
3
K
3
= +3.750000E-10
Coefficients
for
voltage segment range of
3.1641 to 4.3945 volts
K
0
K
0
= +1.00
K
1
K
1
= -1.675000E-03
K
2
K
2
= +1.125000E-06
K
3
K
3
= +7.414069E-21
Coefficients
for
voltage segment range of
4.3945 to 6.54785 volts
K
0
K
0
= -3.01
K
1
K
1
= +5.495931E-02
K
2
K
2
= -2.652588E-05
K
3
K
3
= +4.526774E-09
Coefficients
for voltage segment range of
6.54785 to 7.3828 volts
K0
K0 = -7.03
K1
K1 = +7.00
K2
K2 = -2.354167E-03
K3
K3 = +2.604167E-07
Coefficients
for voltage segment range of
7.3828 to 7.6465 volts
K
0
K
0
= -5.04
K
1
K
1
= +4.01
K
2
K
2
= -1.528125E-02
K
3
K
3
= +1.562500E-06
