1.4 The principle of measurement
The measurement is based on simultaneous recording of vehicle brake deceleration
and the controlling force applied to the brake pedal, or recording of the vehicle
deceleration and the air pressure in the air pressure braking system. All data are stored
in the internal memory after the button Start has been applied. The measurement of the
deceleration, the controlling force applied to the brake pedal and the air pressure in the
air pressure brake is realised with the build-in deceleration sensor, the force sensor or
the pressure sensor. At the end of the measurement the maximal values are shown at
the display. A detailed report is printed. During the printing the average value of the
overall deceleration, the average value of control force or the average value of the air
pressure is calculated.
At the beginning of the measurement, the recording interval has to be set. The range of
setting is from 1 to 50 seconds (5 to 300 seconds for CT3010XL). An averaging filter is
available with a filtering constant from 0 (no filter) to 10 (long time constant).
There are more possibilities to start the measurement and the recording:
Starting button
MEAS
External starting button
Setting the threshold value
or combination of the these above.
The recording clearly shows whether the measured smallest average value of the
overall deceleration is as prescribed, and whether the controlling force applied to the
brake pedal or the air pressure have achieved the required values.
The results of measurements (up to 128 data sets) will be stored in its flash memory
and may be printed. With the help of the supplied program, the records may be
transferred to the PC.
After each measurement the hydro sensor or the weight sensor can be connected and
used. Press the button
MEAS
again. After the display shows steady reading, press
MEAS
again. The pressure or weight measurement are stored.
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