Configuration And Calibration; Configuring Output Signal Damping; Exponential Damping - Vaisala PR-23 Series User Manual

7. Configuration and
calibration
All changes of configuration and calibration are made through the Calibration menu
selected from the Main menu by 5 CALIBRATION.
Password
It may be necessary to enter a password before proceeding to the Calibration menu. The
password is shown in
deactivated using the 6 PASSWORD command in the Calibration menu.
By default the password is deactivated.
7.1 Configuring output signal damping
You can apply signal damping in the Outputs display to diminish the influence of process
noise. Damping is applied to the CONC value (and therefore the output signal) of the
selected sensor (see upper edge of the display to check which sensor is selected). If
necessary, you can change the sensor in the Calibration display.
There are three types of signal damping:
• Exponential signal damping
• Linear signal damping
• Slew rate
You can select the type of signal damping in Calibration > Outputs > Damping type. The
damping time depends on the damping type.
7.1.1 Exponential damping
Exponential (standard) damping works for most processes and is the standard choice for
slow and continuous processes. The factory setting is always exponential damping, access
the 3 DAMPING TYPE command to switch between different damping algorithms. In the
exponential damping (standard damping), the damping time is the time it takes for the
concentration measurement to reach half of its final value at a step change. For example, if
the concentration changes from 50 % to 60 % and damping time is 10 s, it takes 10 s for the
DTR to display concentration 55 %. A damping time of 5 ... 15 s works best in most cases, the
factory setting is 5 s. Use the 4 DAMPING TIME menu item to set the damping time. The
following figure shows how exponential damping time affects the measurement.
Product overview (page
Chapter 7 – Configuration and calibration
13). The password function is activated and
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