Siemens VDO modulcockpit II Product Manual page 96

Technical Product Manual
VDO modulcockpit II
5. Testing Instructions
5.8 Electronic Speedometer
Electronic Speedometer With PWM Output
Test of pointer position: test of speed indication
Test at 40 km/h, 80 km/h and 120 km/h or 80% of full pointer deflection if this value is less than 150 km/h .
Connect the instrument per test circuit diagram III with the test cable No. 4 and the measuring cable.
Respect the tolerances per directive 75/443/EEC or your national laws (directives) when testing the
speed indication.
The directive 75/443/EEC says that the following relation must exist between the indicated speed (on the
speedometer) and the effective speed (per test installation):
v = indicated speed
1
Example:
Speedometer with full scale deflection 300 km/h, distance/pulse number (K) = 6000 pulses/km
The maximum tolerance of this speedometer (at full scale deflection = 500 Hz) is:
TU00-0740-0000002
speed x distance/puse number (K)
f =
max
v = effective speed
2
0 ≤ v
- v
1 2
speed x distance/pulse number (K)
f =
max
300
– 300 ≤
[v + 4 km/h] = [v
1
10
[Hz]
3600
v
≤
2
+ 4 km/h.
10
[Hz]
3600
– 300 ≤ + 34 km/h]
1
0904
437-260-980-. . .
437-809-980-. . .
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