Vaisala FS11, Руководство пользователя

Страница: 132 / 176

USER'S GUIDE ____________________________________________________________________
130 __________________________________________________________________ M211187EN-C
3. Stay away from the unit to avoid stray scattering into the receiver,
and give command
CALIBRATE VISIBILITY calibrator_value
For example:
CALIBRATE VISIBILITY
0.790
NOTE Check the correct calibrator value from the opaque glass plates.
The calibrator value is printed on the labels of the glass plates. When
command execution has finished, the FS11 responds DONE and
calculates a new scaling factor and stores it in the non-volatile FLASH
memory.
4. Leave the opaque glass plates in place and continue with section
FSM102 Mechanical Alignment Check Procedure below to
discover if the calibration check failed due to a mechanical
misalignment.
FSM102 Mechanical Alignment Check Procedure
The mechanical alignment check procedure is performed as follows:
1. Perform the calibration check as instructed in section FSM102
Calibration Check Procedure on page 128 (if not yet done).
2. Install the mask plates onto the calibrator plates by opening the
thumbscrews holding the glass plates and sliding the mask plates
under the thumbscrews as shown in Figure 42 on page 131. Secure
the mask plates in place by tightening the thumbscrews.
NOTE The mask plates are marked "RX" and "TX," and they should face the
receiver and transmitter, accordingly.
NOTE The tape stripes on the mask plates should be placed against the glass
plates to prevent the plates from scratching the glass plates.
3. Move away from the optical path.
4. Give the CALIBRATE CHECK command. The command takes
about 90 seconds to complete.