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42 lines
1.7 KiB
Markdown
42 lines
1.7 KiB
Markdown
# How to use a multimeter?
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## Check the circuits (continuity test)
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> **Warning** The tested object should be disconnected from the power supply (de-energized)!
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Using a multimeter, check the absence of a short circuit (check the loop):
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* Set the multimeter to the loop check mode.
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* Test the multimeter by shorting the probes. A unit that operated properly makes a distinctive sound.
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* The red probe is connected to the “+ ”pin, the black probe — to the “-” / ”GND” pin. If the circuit is short, a sound is heard.
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1\. Check OPEN CONDITION of the following circuits (absence of the multimeter sound signal):
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* “BAT+” and “BAT-”
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* “12V” and “GND”
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* “5V” and “GND”
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2\. Check CLOSED CONDITION of the following circuits (presence of the multimeter sound signal):
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* “BAT-” with every contact marked “-” and “GND”
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* “BAT+”, with every contact marked “+”
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## Checking for voltage
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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.
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* Switch the multimeter to the "Measuring DC voltage" mode
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* Select the upper limit of the measured voltage (in our case, not more than 20)
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* Make sure the battery is connected
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* Make the following measurements:
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1. Measure the battery voltage (between BAT+ and BAT-). It should be between 14.0 V to 16.8 V
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2. Measure the voltage at the 5V output. It should not exceed 5.5 V
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3. Measure the voltage at the 12 V output. It should not exceed 12.5 V
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After measurement:
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* disconnect the battery
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* turn off the multimeter
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