Metrohm IC Net 2.3 Manual do Utilizador descarregar pdf (Página 262)

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IC Net 2.3

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<Off> Turn VIS lamp off.

<Zero> Records a new zero spectrum.

The zero spectrum is a reference spectrum.

It should be recorded at a time at which

there is no sample in the measuring cell. It

is used for calculating the absorption spec-

trum.

<Spectrum> Opens the SPECTRUM window (see Section

6.28.5).

Wavelength, nm Sets the wavelengths at which the chroma-

tograms are to be recorded (for max. three

measuring channels).

Bunching, nm Sets the bunching of the wavelengths de-

fined above.

Channel 1, nm Measuring channel 1.

Channel 2, nm Measuring channel 2.

Channel 3, nm Measuring channel 3.

The relationship between Wavelength and Bunching is ex-

plained by using an example:

Set values: Wavelength = 500 nm, Bunching = 21 nm

An upper and a lower limit for the measured wavelengths of

the corresponding measuring channel are calculated from

these values. For these calculations the following equation

applies: subtract "1" from the Bunching value, divide the new

value by 2, and subtract/add the resulting value from/to the

Wavelength value.

Result: wavelengths between 490 nm (lower limit) and 510 nm

(upper limit) will be included in the chromatogram.

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