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M400E Ozone Analyzer Operator’s Manual Theory of Operation
11.5.2. CALIBRATION - SLOPE AND OFFSET
Calibration of the analyzer is performed exclusively in software. During instrument calibration, (see Chapters 9
and 10) the user enters expected values for zero and span via the front panel keypad and commands the
instru
ment to make readings of calibrated sample gases for both levels. The readings taken are adjusted,
linearized and compared to the expected values. With this information, the software computes values for
instrument slope and offset and stores these values in memory for use in calculating the O
3
Concentration of the
sample gas.
The instrument slope and offset values recorded during the last calibration can be viewed by pressing the
following keystroke sequence:
SAMPLE RANGE = 500.0 PPB O3 =XXX.X
< TST
TST > CAL SETUP
SAMPLE
TIME = 16:23:34
O3 =XXX.X
< TST
TST > CAL SETUP
SAMPLE
OFFSET = 0.000
O3 =XXX.X
< TST
TST > CAL SETUP
SAMPLE
SLOPE = 1.000
O3 =XXX.X
< TST
TST > CAL SETUP
USER NOTES:
04315 Rev. C1 217