OM-550
u
36
u
3. Next, find m & b:
X1
= 0 VDC
ç
minimum expected input
=
0 A/D counts
at Transducer minimum output
X2
= 2.0000 VDC
ç
maximum allowable input
=
20000 A/D counts
at Transducer maximum output
Y1
= 20.00 %RH
ç
choose decimal point
= 2
=
2000 display counts
Y2
= 90.00 %RH
ç
keep decimal point
= 2
=
9000 display counts
[Desired % RH resolution 2 places to right
m
= (Y1 - Y2) / (X1 - X2)
of the decimal point (.01% RH)]
=
(2000 - 9000) / (0 - 20,000)
=
0.35000
b
=
Y2 - (m * X2)
=
9000 - (0.350 * 20,000)
=
002000
4. Programming for the previous example:
Figure 4-10
PRESS
1
PRESS
V
PRESS
YES
PRESS
035000
PRESS
YES
PRESS
002000
PRESS
58
PRESS
2
THE FINAL CHANNEL
DESCRIPTION
PRESS THE
EXIT
KEY AND IT IS ECHOED