Hach 8450, Instrument Manual

Page: 44 / 66

Page 44
Optional Data Logger
16116Operation.fm
Section 3
Figure 30 Damping Curve Response (Example)
For other examples, a Damping value of 1 second would cause the reading to
reach 63% of its maximum value in 1 second; a Damping value of 300
seconds would cause the reading to reach 63% of its maximum value in 300
seconds. Thus low damping values cause the reading to respond less quickly
to changes in concentration than no (zero) damping; higher damping values
cause an even slower response. The complete range of the damping
parameter values is 0 to 300 seconds.
Note that maximum value as discussed above is more specifically the
maximum value of change in magnitude. Thus the percent of (signal)
magnitude reached for a given number of time constants is equally applicable
to reductions in magnitude as well as increases in magnitude. The overall
affect of increased damping is a smoothing of the meter’s response to
changes in concentration (
Figure 31 ).
Figure 31 Output Damping Relative to Input (Example)
3.23 Optional Data Logger
The data logger option permits the 8400 Series instruments to sample and
store concentration readings internally. To access the data logging menu,
enter the “> GEN” menu and select “LOG”.
99% Final = 8.22 ppm
98% Final = 8.15 ppm
95% Final = 7.88 ppm
86% Final = 7.16 ppm
63% Final = 5.23 ppm
Time (seconds)
Time Constants 1 2 3 4 5
FINAL VALUE = 8.3 ppm
Magnitude
Input
Output
Damping Time
Time