Device testing
Variable speed
48
7.2
Variable speed
Testing of variable speeds, e. g. for:
•
tests at a defined speed
•
function checks of the road speed limiter.
Digital tachographs display the speed at which a vehicle is
being driven.
The "Variable Speed" function enables you to check the
digital tachograph's display function and the adherence to
legal limits of error.
1
Press
to start the "Test device" menu.
The CTC II reads the tachograph type and the K value.
2
Confirm the current K value or use
...
to enter the new
value.
Press or to increase or decrease the value in
increments of 1 km/h (and or in increments of 0.1 km/h).
Remark:
The CTC II sets the three measuring speeds for a tachograph
with a measuring range upper limit of 125 km/h.
3
–
Adopt the predefined speed value or
–
use
...
to enter the new value and confirm.
Press or to increase or decrease the value in
increments of 1 km/h (and or in increments of 0.1 km/h).
4
Check speed indicator and display value.
Waiting time is roughly 120 seconds.
5
Repeat the test for all three measuring points.
Please take note of the table's measuring range upper limit.
6
Check speed recording.
The value must lie within the given tolerance.