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90003749(1) [NGA-e (Software CLD 2.3/MLT 3.1.X)] 04/98
NGA 2000
5 - 57
4) Spanning:
• Change to the submenu "Analyzer span" with the F4 key (SPAN).
• Pay attention to the notes on the screen !
• Flow enough span gas through the CLD.
• Wait for a stable signal (look at the headline of the display). Then, start the span gas
calibration with the F4 key (SPAN). The running procedure will be the same as it is
described detailed in chapter 4.2.2 of the basic controls (p. 4-26pp).
• Go back to the menu "Zero/span calibration" with the F2 key or the ←← -key after the
span gas calibration will be done (Messages on the display: READY/CAL OK).
Alternative: Go back to the "Main Menu" with the F1 key (HOME).
5) Check the calibration results:
• You can change to the submenu "Zero/span diagnostic data" via the line "Result..." of
the menu "Zero/span calibration". There you can control the results of the last zero
and span calibration. You can go back to the menu "Zero/span calibration" with the F2
key or the ←← -key.
Manual input of calibration factors:
The calibration may be wrong because of a trouble in the gas flow. If a calibration was not
successful, you have to repeat it. It is possible that a new start of calibration will not solve
the problem, if the measured zero or span gas value will differ from normal signals largely.
In that case you have to put in the calibration factors manually:
♦ From the menu "Zero/span calibration" you can change to the submenu "Calibration
Factors" with the F2 key (FACTORS):
♦ Select the range you want in the line "Measurement range number" and change via the
line "Range 1/2/3/4 factors..." to the corresponding submenu:
HOME ESCAPE INFO
CLD
F1 F2 F3 F4 F5
95.0 ppm
Calibration Factors
Only those factors appropriate for the current range
Make sure you are using the right ones!
Measurement range number: 3
Range 1 factors...
Range 2 factors...
Range 4 factors...
will affect the reading on the current range.
Range 3 factors...