Calibration

Principle of calibration

1.       Sensors with one output are calibrated to its value at one point with a potentiometer

2.   Sensors with calculated outputs are calibrated via RS 232

2.1   Sensors with RS 232 = via RS 232

2.2   Sensors with Palm = via Palm

2.3   Analog sensors = via an extra cable RS 232

 

Low point always has to be the lowest possible

High point does not need to be the highest it can be lower

 

XML format lettering

First identifying letter is C for calibration

Second letter is                         R for roughness

Second letter is                         P for polarization

Second letter is                         O for rotation

Second letter is                         I   for refractive index

Third letter Low calibration value L = for calibration low point

Third letter High calibration value             H = for calibration high point

 

Definition

Measured value for low calibration point   =           X = reflected / scattered or left / right

Measured value for high calibration point =           Y = reflected / scattered or left / right

Measured value at any point                    =         Z = reflected / scattered or left / right

 

Formula for calibration                Result = L + ( H L ) ( Y X ) / ( Y - Z )

                                               

Data format

Command 19 200 bd, 8 data bits, parity none, stop bit 1, flow control Xon / Xoff

Enter the following text to call the sensor

<device>

   <name>sensor</name>

   <manufacturer>ia</manufacturer>

   <model>XXX</model>    digit a 3 digit no from the sensor

   <serial>123456>/serial>  digit a 6 digit serial no

   <read>call</read>           digit a 3+ 3 digit no. see table

</device>

 

Roughness measurement in micron = 1000 = 100 micron

1.       Calibrate to low value  = CRL123   = store L and X in CRL  and no response

2.       Calibrate to high value = CRH123  = store H and Y in CRH and no response

3.       Measure roughness = L123 + ( H123 L123 ) ( Y123 X123 ) / ( Y123 Z123 )

 

Rotation measurement in degree = + / - 100 degree

4.       Calibrate to low value  = COL123   = store L and X in COL and no response

5.       Calibrate to high value = COH123  = store H and Y in COH and no response

Measure rotation = L123 + ( H123 L123 ) ( Y123 X123 ) / ( Y123 Z123 )

 

Polarization measurement in index %  = 1000 = 100 %

6.       Calibrate to low value  = CPL123   = store L and X in CPL and no response

7.       Calibrate to high value = CPH123  = store H and Y in CPH and no response

Measure polarization = L123 + ( H123 L123 ) ( Y123 X123 ) / ( Y123 Z123 )

 

Refractive index measurement in refractive index = 1.33 = 1330

8.       Calibrate to low value  = CIL123   = store L and X in CIL and no response

9.       Calibrate to high value = CIH123  = store H and Y in CIH and no response

Measure refractive index = L123 + ( H123 L123 ) ( Y123 X123 ) / ( Y123 Z123 )

 

Counter - encoder

000000   = set counter to zero