78
Users Manual
24
RPM
tu
How to Measure RPM with the RPM80
Inductive Pickup (Optional)
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:
Warning
Because the ignition system creates a shock
hazard, turn off the engine before connecting
or removing the inductive pickup.
Unplug the RPM80 from the meter before
measuring voltages above 30 V.
1. Insert the pickup plug into the jacks shown in Figure
10. Make sure the + end of the plug is in the RPM
jack.
2. Turn the rotary switch to RPM tu. The meter has
two RPM functions:
• Use RPM(2) for engines that fire once every two
revolutions.
• Use RPM(1) for engines that fire every revolution
or for waste spark, distributorless ignition sys-
tems (DIS) -- ie., 1 RPM count/spark.
3. Spread the spark plug wires apart. Clamp the induc-
tive pickup to a plug wire near the spark plug. (In
general, the longest wire works best.) Make sure that
the jaws are closed completely and the side labeled
SPARK PLUG faces the spark plug.
4. Start the engine.
If 0 RPM is displayed, turn OFF the engine and re-
verse the inductive pickup so that the side labeled
SPARK PLUG faces AWAY from the spark plug. Start
the engine.
5. To toggle between RPM(2) and RPM(1), press R
for two seconds.
The display shows "RPM(2)" or "RPM (1)", depending
on the function selected.
Read RPM on the display.
6. TURN OFF THE ENGINE. Remove the pickup.
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