Electric Time Constants (Function 50) - Siemens OXYMAT 64 Operating Instructions Manual

The parameters menu contains all functions which are required for parameterizing the
device.
You can branch to further parameter functions by pressing the fifth softkey, "...continue".
This menu is protected by the code of code level 1.
5.4.5.2

Electric time constants (function 50)

5O Electr. time con
Effective bandwidth in
% of smallest MR: : 6.O: %
Time constant within
bandwidth ti:
Time constant outside
bandwidth ta:
Actual measured
value: O.OO
Figure 5-34
With this function, you set various time constants in order to reduce noise. The noise
reduction is approximately equivalent to a low-pass filter with the corresponding time
constant. The display delay is given as the 90% time.
The time constant "ti" acts within an parameterizable effective interval which is defined in %
of the smallest span. It attenuates small changes in the measurement (e.g. noise) on the one
hand, but becomes ineffective immediately when the measured value exceeds the effective
interval. In this case, the outer time constant "ta" attenuates the measured value.
You can parameterize values up to 100% for the effective interval, and values up to 100 s for
the time constants "ti" and "ta". By cleverly combining these three parameters, you can
achieve a low display delay (90% time) despite high noise suppression.
The effect on the set attenuation parameters can be observed in the bottom line. The "live"
measured value is displayed here.
OXYMAT 64
Operating Instructions, 06/2008, A5E00880383-03
O
2
1O.O s
1.O s
vpm
Electric time constants
Operation
5.4 Operating functions
71