Casio CFX-9850G User Manual page 57

Chapter 3: Commands and Programming
Coefficient Parameter
This parameter specifies the coefficients of the calibration equation being
used. Two coefficients (a, b) are specified for the linear equation (ax + b),
while three coefficients (a, b, c) are specified for a quadratic equation (ax
+ c).
CALIBRATE PROBE Examples
Example 1: Calibrating the light probe to a reference value
The light probe can perform sampling at a distance of one to four meters
from a light source. The following example uses a light source with a bright-
ness of 800 at one meter and 200 at four meters, to produce calibration
values based on changes in brightness between those two points.
{1,0}"List 6!
Send(List 6)!
{1,1,1}"List 6!
Send(List 6)!
ClrText!
"HOW MANY POINTS"?"N!
Seq(0,X,1,N,1)"List 2!
Seq(0,X,1,N,1)"List 3!
For 1"I To N Step 1!
ClrText!
"ENTER BASE VALUE"?"B!
B"List 2[I]!
{3,0.01,5,0,0}"List 6!
Send(List 6)^
Receive(List 4)!
(Sum List 4-Min(List 4)-Max(List 4))÷3"List 3[I]!
Next!
LinearReg List3,List2!
"FINISHED"!
"A=":a^
"B=":b!
Values a and b obtained by this program can be set using Command 9 before
performing actual sampling.
{9,Channel,1,a,b}"List 6
Send(List 6)
58
Specifies light probe connected to Channel
1 (CH1).
Calibration of probe for two-point data for
this example.
Input of reference value. At this time, light
probe should be in state that will be experi-
enced during sampling.
(display halt)
(display halt)
("Channel" is the specification of the chan-
nel to be used for sampling.)
2 + bx