Internal calibration requires that the engine is running at a speed of 2000 rev/min, as shown on the tachometer in
the vehicle (ideally calibration should be carried out when the vehicle is being driven, that is, moving). When this
speed is reached, press and hold “Cal. Int.” button until the red LED stops flashing and is permanently illuminated.
Calibration is than completed and the calibration value is stored permanently in the device even after power is
turned off. The calibration value is only deleted if the “Cal. Int.” button is pressed again: the old calibration value is
then replaced by the new value. (The same applies to external calibration). The actual engine speed appears on the
screen and the analog output returns 1V per 1000 rev/min.
During calibration and during the entire test you should turn on all resistive loads such as lights and rear window
heater; and turn off all inductive loads such as the air conditioning system, sliding roof, power windows and
ventilation. You shouldn't use an external laser tachometer during internal calibration!!.
When a constant speed of
2000 rev/min is registered
by the vehicle tachometer,
press the Cal. Int. button
until the red LED stops
flashing, and remains
constantly illuminated.
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