Valeport 803 - Page 25

Valeport Ltd © 2019
Appendix 4 - Calibration
Page 25
To alter calibration coefficients, the following commands and data entries can be sent:
Code
Followed by “space” and
Operation
#170
X counts at zero flow<cr>
Sets the X channel Zero Offset in counts
#171
Y counts at zero flow<cr>
Sets the Y channel Zero Offset in counts
#174
X gain factor<cr>
Sets the X channel Gain Factor
#175
Y gain factor<cr>
Sets the Y channel Gain Factor
#192
X channel Hydro cal<cr>
Sets the X channel Hydrodynamic Calibration
#193
Y channel Hydro cal<cr>
Sets the Y channel Hydrodynamic Calibration
The format of the Hydrodynamic Calibration is as follows:
Calibration Function No.
OPERATION
1
One straight line fit
2
Two straight line fit
3
Three straight line fit
4
Four straight line fit
5
Five straight line fit
Thus, for example, a three line fit calibration for the X channel will be entered in the format shown below
(note the single space between each value):
#192 3 Coefficient1 Offset1 Max_lt1 Coefficient2 Offset2 Max_lt2 Coefficient3 Offset3 Max_limit3<cr>
1. The Coefficient is the slope of the straight line segment in engineering units per count.
2. The Offset is the Y axis [engineering value output] intercept at zero counts for the straight line segment
3. The Max_lt is the maximum counts [must be a whole number] up to which, but not including, the straight
line operates .
The first straight line starts from 0 up to Max_lt1 in A/D counts, but not including it.
The second straight line starts from Max_lt1 and including it, up to Max_lt2 but not including it.
The Third straight line starts from Max_lt2 and including it, up to Max_lt3 but not including it.