03) Hook Up
03.1) RPM pickup with Dispeed probe
03.2) RPM pickup with trigger clamp
03.3) RPM pickup through OBD connector
03.4) Engine temperature sensing
03.5) EOBD temperature sensing
3.1) RPM pickup with Dispeed probe
The DiSpeed 492 is a magnetic RPM sensor that is attached to any steel part of the engine with a magnet.
The sensor measures vibrations and sounds. The LED in the magnet is red when there are no vibrations (engine off) or when the automatic calibration has not been performed yet. The electronics will automatically filter out and focus on one repetitive pulse and take that as one revolution.
As soon as the sensor picks up a pulse its LED will turn orange indicating that a single point calibration has been performed. The tester's display (computer screen) will indicate an RPM figure. (see picture below)
The screen displays the engine speed.
To have accurate RPM’s displayed a two point calibration is necessary, for this the engine speed needs to be raised to about ¾ of maximum speed.
The LED will turn green when the calibration has been completed.
Please note:
It is important to know that no cylinder quantity selection is necessary and that the calibration process takes only about 10 seconds or so.
The last selected type of RPM measurement will reappear, until it is being changed.
In this screen are selectable 4 wheel vehicle and 2 wheel vehicle (motor bike) as the sensitivity (engine inertia) for both vehicles are very different.
Also in this screen a different type of RPM measurement can be selected, see: Chapter 3.2) Trigger clamp, or Chapter 3.3) OBD connector.