Eurotherm 6100, User Manual

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100/180MM DISTRIBUTED GRAPHIC RECORDER: USER GUIDE
HA029324
Issue 11 Oct 14 Page 89
4.3.9 User Linearisation Tables
Note: The User Linearisation confi guration menu appears for all versions of the recorder, but not every
version has a ‘Lin Type’ fi eld in
Channel confi guration allowing such tables to be selected for use.
The Channel confi guration item ‘Lin Type’ includes 12 linearisation tables called, initially, UserLin1 to
UserLin12. This User Linearisation part of the instrument confi guration allows the user to enter a linearisa-
tion 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 specifi ed 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 fi rst) must be greater than the previous one.
3. Each Y value (other than the fi rst) must be greater than the previous one.
4. To specify units other than temperature units, the channel ‘
scaled ’ facility must be used. The
scale low/high values should be set to be the same as the range low/high values, and the re-
quired units entered
The import/export Linearisation tables feature described in ‘Save/Restore’ ( section 4.2 ) offers an alterna-
tive way of entering linearisation tables.
Figure 4.3.9a shows the default confi guration 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
1
UserLin3
Apply Discard
Y2
Select Numeric
or Scientific
Figure 4.3.9a User linearisation confi guration page
CONFIGURATION PARAMETERS
User Linearisation Allows a user linearisation table to be selected for confi guration.
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
‘Scientifi c’ format (Scientifi c). When ‘Scientifi c’ is selected, values are displayed and en-
tered as a decimal number between 1 and 10† (the mantissa), followed by a multiplier (the
exponent). 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 has been 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.