Hach Lange DR 3900 User Manual page 89

Table 11 Description of the keys for the editing of formulae(Continued)
Screen Key Description
Press >=< to include logic statements/links/conditions in
the formula. The following functions are available:
= (Equal to), < (Less than), > (Greater than), <= (Less
than or equal to), >= (Greater than or equal to), IF,
THEN, ELSE
When the evaluation formula C1 has been entered
>=<
completely, press OK to confirm. Press OK again to
return to the Formula display.
When the formula C1 has been entered and confirmed,
the parameter name, upper and lower limits of the
measuring range and display result (yes, no) can be
entered.
Entering the next calibration formula (C2 or Cn)
1. Mark C2: Out.
2. Press Edit.
3. Mark C2: Out.
4. Press Edit.
The display switches to C2: On.
5. Mark the next row C2= to define the formula.
6. Press Edit.
In addition to the keys described in
function is available:
Select Conc. key
1. If an already defined formula, in this case C1, is to be taken
into account in the formula for C2, press Select conc.
2. Enter the numbering of the equation (e. g. 1 for C1).
3. Press OK to confirm the entry.
Cn can now be linked with a mathematical operation.
Note: The Cn concentrations that are to be calculated are numbered in
sequence: C1, C2, C3, etc.
Note: When the first Cn formula has been defined, the Formula list is
automatically extended by Cn+1.
Expanded programs
Table 11, only one other
89