Hach-lange DR 3900 User Manual User Manual download pdf (Page 88)

Expanded programs

Table 11 Description of the keys for the editing of formulae

Screen Key Description

Abs/Variables

Press the Abs/Variables key to select, from the

displayed list, the required element of the defined

measuring sequence and therefore the corresponding

reading wavelength, so that this can be taken into

account in the formula.

New Number Press New Number to enter a new factor or constant.

+ –

÷ ×

Press + –

÷ × to enter a mathematical operation.

Select the operation and press OK to confirm.

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 the basic

mathematical operations).

The following mathematical operations are available:

• + (Addition)

• - (Subtraction)

• ÷ (Division)

• × (Multiplication)

• ^ (Exponent)

• Ln (Natural logarithm)

• Log (Common logarithm)

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Hach-lange DR 3900 User Manual User Manual Page 88