Performing calibration check - FD70

FD70 Configuration and Maintenance Guide
Document code
M212222EN
Revision
J
Language
English
Product
FD70
Document type
User guide
  • Field calibrator kit for FD70 (FDA701)
  • Maintenance laptop with terminal software

FD70 has a transmitter, a main receiver and a side receiver, depending on the configuration you have chosen. The following procedure describes the general calibration checking steps. Perform calibration for the main receiver and transmitter, and then perform the same calibration steps for side receiver and transmitter.

Before you start, clean the windows as instructed in section Cleaning windows.

During window cleaning, measurement data is invalid.
Calibration check (mode calcheck, mode calcheck 2) does not change any values.
Requirements for calibration check
Property Requirement
Visibility > 2000 m (6560 ft)
Present weather Calibration is not recommended to be carried out in heavy rain or in bright sunshine

Perform calibration check:

  • At least every 12 months.
  • In case of severe physical or mechanical impact.

Calibration check has the following phases:

  • Preparation
  • Zero signal calibration check
  • Scatter signal calibration check

The result of the calibration check is one of the following:

  • Pass: the calibration is valid
  • Fail: calibration adjustment is needed

You can cancel the process at any point.

  1. Before you start, check the opaque glass of the calibrators and clean them if necessary.
    1
    Calibrator
    2
    Opaque glass
    Be careful not to scratch the calibrators, especially the opaque glass. Damaged calibrators have a negative effect on the calibration.
  2. Establish a maintenance connection to FD70.
  3. Type the following commands: 
    level 2
    mode calcheck

    For the side receiver, type the following command:

    mode calcheck 2

    Follow the onscreen instructions.

  4. When prompted for Calibrator Signal Value, type the 4‑digit value.

    The same value is printed on the calibrator certificate, on the calibrator labels, and the calibrator case.

  5. When prompted to install the calibrators with zero signal plates, remove the protection caps from the transmitter and receivers.
  6. Attach the calibrators with zero signal plates on the transmitter and receiver.

    There is a dedicated calibrator for the transmitter and one for the receivers. Check the labels on the calibrators to make sure that you attach them correctly. The following figures show the calibrator attachment process for the main receiver and the side receiver.

    1
    Transmitter
    2
    Side receiver
    3
    Main receiver
    4
    Calibrator for transmitter (labeled)
    5
    Calibrator for receivers (labeled)
    6
    Zero signal plate (2 pcs)
    7
    Thumb screw (2 pcs / calibrator)
    1
    Transmitter
    2
    Side receiver
    3
    Main receiver
    4
    Calibrator for transmitter (labeled)
    5
    Calibrator for receivers (labeled)
    6
    Zero signal plate (2 pcs)
    7
    Thumb screw (2 pcs / calibrator)

    The system performs zero signal calibration.

    • The zero signal calibration passes if the zero signal value is within ±0.012.

    • If the zero signal calibration fails, eliminate all possible reflections and external light sources.

  7. When prompted, remove the zero signal plates.

    The system performs scatter signal calibration. Keep the measurement area clear to avoid interference.

    • The scatter signal calibration passes if the scatter signal value is within 3 % of the calibrator signal value.

    • If the scatter signal calibration fails, calibration adjustment is needed (mode adjust, mode adjust 2).

  8. When done, remove the calibrators, reattach the protection caps on the transmitter and receiver, and close the maintenance connection. 
    close
Write down the calibration check date.