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Operation
5-29
Operating instructions ULTRAMAT 23 gas analyzer
C79000-B5276-C216-03
5.9.3
Parameters: Time Constants
You can use this function to set various time constants to suppress
noise in the measured signal. During processing of the measured
signals, these time constants reduce the noise by delaying the signal.
The time constant ”T90 within” is effective within a parameterized
interval whose threshold values are defined as a percentage of the
smallest measuring range. The time constant dampens small changes
in signal (e.g. noise), but becomes immediately ineffective if a fast
change in signal exceeds a threshold. When this occurs, the signal is
dampened by the time constant ”T90 outside” until it falls below the
threshold value again, whereupon ”T90 within” becomes effective
again.
Upper
threshold
Lower
threshold
Measured value
T90 within
is valid
T90 within
is valid
T90 outside
is valid
t
fast change in signal
Fig. 5-8
Thresholds and time constants
The following values are possible for the time constants:
S
T90 within, outside
: 0.1 to 99.9 (s)
S
Threshold
: Data in %: 0 to 100 % of smallest range
5.9.4
Parameters: Pump/LCD Contrast
You can use this menu to select two dialogs via which the pump
capacity and the contrast of the LCD can be changed.
Time constant SO
2
T90 within:
12 s
T90 outside:
3 s
Threshold:
3 %
593
Adjust pump/flow
Adjust LCD contrast
594
Содержание 7MB2335
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