Hach-Lange DR 2800 eco - Manual (Page 81)

79
Advanced Operations
Content and use of the keys:
Abs/Variables key:
1. Press the Abs/Variables key to select, from the displayed list,
the required element of the defined measuring sequence and
therefore the corresponding measurement wavelength, so that
this can be taken into account in the formula resp. to use
Variables.
New Number key
1. Press New Number to enter a new factor or constant.
+-/* key
1. Press +-/*, to enter a mathematical operation. Select the
operation and confirm your input by pressing OK.
The available choice of mathematical operations depends on
the defined formula.
This means that functions such as "( )" or "ln"/"log" etc. are
only active if a term in parentheses or the calculation of a
logarithm is mathematically permissible in the defined formula
(this also applies to all further basic mathematical operations).