Campbell CS120A, Instruction Manual

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CS120A and CS125 Visibility and Present Weather Sensors
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Menu 9 and 0: Exiting the menu system
Options `9’ and `0’ exit from the menu system. Note that typing `0’ will lose all
changes made including communications settings.
16. Calibrating the sensor
16.1 Visibility calibration
The sensor can be checked and adjusted using the optional sensor high grade
calibration kit part number 010805. The calibration must be run using the
onboard menu system. If you have Campbell Scientific’s Device configuration
program a terminal emulation screen is provided in the sensor screens to let you
access this function. To perform the calibration you will need a sensor calibrator
disk and a computer with a standard serial port compatible with the sensor. If
your sensor is not currently configured for RS-232 communications you can set
the internal switch, switch three, to temporarily set the sensor to RS-232 mode
38400 bps. If the sensor is already set in RS-232 mode it should not be necessary
to change any internal switches. (See Section 10 for more information on the
sensor internal switches.)
The test should ideally be performed in the following conditions:

Ambient temperature should be between 0ºC and 50ºC

The local visibility should be approximately 10,000 metres or higher.
The system is self-regulating. However, it is recommended that the sensor is
calibrated at least every two years.
The calibration is performed from menu item 3 on the main terminal screen.
Please refer to the menu section (Section 13) of this manual for further
information on how to access this menu.
Once you have selected menu item 3 you should be presented with the following
screen.
CS125 CALIBRATION - MENU 3
ID 0
S/N 1006
(1) Perform calibration
(2) Restore the factory calibration
(3) Perform dirty windows zero offset calibration
(4) Restore dirty windows factory calibration
(9) Refresh
(0) Return to main menu
CAMPBELL SCIENTIFIC LTD sensor menu exited.