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How to use a multimeter?

Check the circuits (continuity test)

WARNING

The tested object should be disconnected from the power supply (de-energized)!

Using a multimeter, check the absence of a short circuit (check the loop):

  • Set the multimeter to the loop check mode.
  • Test the multimeter by shorting the probes. A unit that operated properly makes a distinctive sound.
  • The red probe is connected to the “+ ”pin, the black probe — to the “-” / ”GND” pin. If the circuit is short, a sound is heard.

Loop check mode

1. Check OPEN CONDITION of the following circuits (absence of the multimeter sound signal):

  • “BAT+” and “BAT-”
  • “12V” and “GND”
  • “5V” and “GND”

2. Check CLOSED CONDITION of the following circuits (presence of the multimeter sound signal):

  • “BAT-” with every contact marked “-” and “GND”
  • “BAT+”, with every contact marked “+”

Checking for voltage

Using a multimeter, you need to make sure that the voltage converters located on the power distribution board are working properly and provide the voltage of 5V and 12V, respectively.

  • Switch the multimeter to the "Measuring DC voltage" mode
  • Select the upper limit of the measured voltage (in our case, not more than 20)
  • Make sure the battery is connected
  • Make the following measurements:
    1. Measure the battery voltage (between BAT+ and BAT-). It should be between 14.0 V to 16.8 V
    2. Measure the voltage at the 5V output. It should not exceed 5.5 V
    3. Measure the voltage at the 12 V output. It should not exceed 12.5 V

After measurement:

  • disconnect the battery
  • turn off the multimeter