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docs/en/test_connection.md

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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](../../assets/startPDBtest.jpg)
+
+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