Bosch MMD 540H Instruction Manual page 26

MMD 540H Hybrid Multimeter | Meter Functions | 25
Meter Functions – RPM/×10RPM
Ñ
Select the RPM range with the rotary
switch.
OR
Ñ
Select the×10RPM range with the rotary
switch (1,000 to 12,000 RPM). Multiply
the displayed reading by ten to get
actual RPM.
Press STROKE
through RPM
2-stroke and DIS ignitions.
Insert the inductive pickup connecting
terminals into the meter.
Ñ
Black lead in COM terminal.
Ñ
Red lead in V-Ω-RPM terminal.
Connect the inductive pickup to a spark
plug wire. If no reading is received, unhook
the clamp, turn it over and connect again.
NOTE:
Ñ
Position the inductive pick-up as far away from the distributor
and the exhaust manifold as possible.
Ñ
Position the inductive pick-up to within six inches of the spark
plug or move it to another plug wire if no reading or an erratic
reading is received.
RPM 4: For RPM of 4-stroke engines which have 1 ignition on every
4 engine strokes
RPM 2: For RPM of DIS ( Distributorless lgnition System) & 2-stroke
engines which Have 1 ignition on every 2 engine strokes
NOTE: The rpm pick-up has an adjustable sensitivity switch that
can also be used to correct an unstable reading.
MMD 540H Instruction Manual | Version 1 | February 2008
/ DIS button to select
for 4-stroke, RPM
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Robert Bosch LLC