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NGA 2000
90003482(2) [NGA-e (MLT-Software 3.2.X)] 07/98
If the deviation of the two values is less then the allowed maximum calibration deviation
(see menu "Tolerances", p. 5-7/8), the calibration may start. If not, the stability control is
starting again until a stable measurement is possible. The time in the line "Procedure
times-out after" is the limit for the whole procedure.
The following figure shows the procedure of the stability controlled zero and span gas
calibration:
Note:
The stability time and the averaging time are factory settings and cannot be changed by
the customer. If you want to use other values, ask your service !
Line of variables "Analog output during calibration":
Here, you can determine if you want to hold the analog output and the limits of a local SIO
in the MLT analyzer module during calibration. The set-ups for a platform or MLT analyzer
SIO have to be done in the menu "Analog Outputs" (see 5.2.1 p. 5-87).
♦ Tracking: The analog output signal is following to the signal during the whole calibra-
tion procedure.
♦ Holding: During the whole calibration procedure the analog output signal is fixed to the
last signal before calibration. This adjustment may be used for instance to control limits
with the analog output.
Concentration
Time
Purge
Time
Stability
Time
Stability
Time
Stability
Time
Stability
Time
Start Zero
Calibration
T
i
Averaging
over T
i
Start Span
Calibration
Sample Gas Zeroing Spanning Sample Gas
0V
Analog Output
Tracking
Analog Output
Holding
xV