Amprobe AU92 Automotive-Multimeter - Manual (Page 10)

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RPM ➊ ➋ Button: In the RPM function the meter defaults to RPM ➋ for conventional
4-Cycle engines. Press the RPM button to toggle to RPM ➊ for 2-Cycle engines or waste
spark (DIS) 4-Cycle engines.
RPM Measurements (fig. 1)
1. Set the Function/Range switch to the desired RPM range.
2. Connect the red inductive pick-up to the “VΩ” jack and the black inductive pick-up
to the “COM” jack.
3. Connect the inductive pick-up to a spark plug wire. If no reading is received, unhook
the clamp, turn it over and connect again.
4. Press the RPM button to toggle between RPM ➊ for 2-Cycle engines or Distributorless
Ignition System (DIS) or RPM ➋ for 4-Cycle engines.
Dwell (fig. 2)
1. Set the Function/Range switch to the desired Dwell range.
2 Connect the red test lead to the “VΩ" jack and the black test lead to the "COM" jack.
3. Connect red lead to coil “-“ and black lead to ground
Voltage Measurements (see fig. 3)
1. Set the Function/Range knob to Voltage V
. Use the Function button to select AC or
DC voltage
2. Connect the test leads to the device or circuit being measured.
3. For DC, a (-) sign is displayed for negative polarity; positive polarity is implied.
Current Measurements (see fig. 4)
1. Set the Function knob to uA, mA, 10A. Use the function button to select AC or DC
current.
2. Connect the red test lead to the (uA, mA or 10A) jack and the black test lead to the
“COM” jack.
3. Remove power from the circuit under test and open the normal circuit path where
the measurement is to be taken. Connect the meter in series with the circuit.
4. Apply power and read the value from the display.
Resistance Measurements (see fig. 5)
1. Set the Function knob to the Ω
. Use Function button to select ohms Ω.
2. Connect the red test lead to the “VΩ" jack and the black test lead to the "COM" jack.
3. Remove power from the equipment under test.
4. Connect the test leads to the points of measurements and read the value from the
display.