100/180 MM GRAPHICS RECORDER: USER GUIDE
HA261742
Issue 16 Nov 04
User Guide
Page 86
4.3.9 User Linearisation Tables
The Channel configuration item 'Lin Type' includes four linearisation tables called, initially, UserLin1 to UserLin4.
This User Linearisation part of the instrument configuration allows the user to enter a linearisation look-up table of
between two and 66 pairs of points.
The pairs of points are entered as X1Y1, X2Y2... ...XnYn,
where 'n' is the specified number of points.
X1 to Xn represent the inputs to the function.
Y1 to Yn represent the corresponding outputs from the function.
Notes:
1.
Each Y value must be unique - i.e. there cannot be more than one X value with the same Y value assigned
to it.
2.
Each X value (other than the first) must be greater than the previous one.
3.
Each Y value (other than the first) must be greater than the previous one.
4.
To specify units other than temperature units, the channel '
' facility must be used. The scale low/
high values should be set to be the same as the range low/high values, and the required units entered
The import/export Linearisation tables feature described in 'Save/Restore' (
) offers an alternative way of
entering linearisation tables.
Figure 4.3.9a shows the default configuration page. Figure 4.3.9b shows a simple table for relating water depth to
water volume for a cylindrical tank with a conical bottom.
User Linearisation
Descriptor
Format
Number of Points
X1
Y1
X2
3) UserLin3
Numeric
2
0
0
1
Apply
Discard
Y2
1
UserLin3
Select Numeric
or Scientific
Figure 4.3.9a User linearisation configuration page
CONFIGURATION PARAMETERS
User Linearisation
Allows one of the four user linearisation tables to be selected for configuration.
Descriptor
Allows the user to enter a name of up to 20 characters (including spaces) for the table.
Format
This allows the point pair values to be entered as normal numeric values (Numeric) or in
'Scientific' format (Scientific). When 'Scientific' is selected, values are displayed and entered
as a decimal number between 1 and 10† (the mantissa), followed by a multiplier (the expo-
nent). E.G. to enter a value of 1244.5678, the value entered would be 1.2445678E3, where 3
represents the number of places that the decimal point must be shifted to the left in order to
convert the value to a number between 1 and 10†. To enter a value of 0.0004196, the entry
would be 4.196E-4. Figure 4.3.9b, below, gives further examples.
† Notes
1.
Strictly this is a number less than 10, as 10 would be 1.0E1.
2.
There must be at least one number after the decimal point.
