The RPM80 Inductive Pickup accessory allows the Fluke 78 to measure engine RPM via the secondary ignition impulses in the spark plug wires. It features a selection for DIS or conventional systems.

Fig 16 - Measuring RPM with the RPM80 Inductive Pickup The RPM80 Inductive Pickup converts the magnetic field created by the current in the spark plug wire to a pulse that triggers an RPM measurement. To measure RPM using the pickup, attach the probe to any accessible sparkplug wire and select the normal (1) or DIS (2) setting to read the correct RPM for the engine you are working on.