5.1.8 Analyzer Module Set up

Linearization Functions

Main Menu — Expert controls and set up

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Analyzer module set up

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Gas measurement parameters

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Linearization functions

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CLD

95.0 ppm

Linearization functions

Polynomial set up...

Midpoint correction set up...

Use the polynomial set up to generate a linearizing polynomial from up to 20 gases. With more than 6 gases it will produce a fourth order polynomial linearizer.

Use the midpoint correction for a piecewise-linear final correction, to bring up to three points precisely onto the curve.

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From the menu "Linearization functions" you can change to several submenus, where you can linearize the ranges and optimize the linearization functions:

¨Change to the line you want with the ↓ -key or the − -key. Note:

Normally, the CLD is working linearly in the whole range. Therefore you do not have to linearize generally ! If you will find deviations from the linearization, you should control the ozone and sample gas supply. Optimize it, if necessary! Usually, the reason for deviations will be a defect in the ozone supply.

Polynomial set up:

Press the ENTER key or the → -key in the line "Polynomial set up..." to change to the corresponding menu:

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NGA 2000

90003749(1) [NGA-e (Software CLD 2.3/MLT 3.1.X)] 04/98