A device for accurate measurement of the parameters of circuits and electronic equipment, which is one of the measurement products and precision instruments. Due to the high importance of multimeter, usually electronic engineers always carry it with them. Another name of the ohmmeter is the voltmeter, which actually measures resistance, alternating voltage, direct voltage, and current.
is an electronic device that is used to measure electrical characteristics and parameters and is of two general types: 1- Analog (Aqriyyah )
2- digital operation in the second type, considering that most operations of measuring and changing the range are automatic
It is easier and more accurate. The quantities measured by the ohmmeter are generally as follows:
1- direct current DC and alternating AC amperes 2-voltage direct current DC and alternating AC 3-ohm 4- Interruption and continuity of the DC direct current ampere measurement method (such as the output current of the rectifier or the consumption current of the center) This mode is used to measure the current passing through a circuit. In this mode, the rotary selector switch of the ohmmeter is on the symbol. DCA-10 is placed and the wires of the ohmmeter are placed in series in the circuit, the connection point of the wires of the ohmmeter on the ohmmeter inputs (COM) and (+10A) it is necessary to make sure that the ohmmeter is connected in series in the circuit and the passing amperage is not more than ten amperes. If it is connected in parallel with the ohmmeter circuit, it will definitely be damaged. The method of measuring AC alternating current amperes (city electricity) is used to measure the current passing through An alternating current circuit is used as the power supply path of the rectifier. In this case, the rotary selector switch of the ohmmeter is placed on the AC A 10 symbol. And the wires of the ohmmeter are placed in series in the circuit. The connection of the wires of the ohmmeter is on the ohmmeter inputs (COM) and (+10A). Be careful. that the ohmmeter must be connected in series in the circuit and the passing amperage is not more than ten amperes, if it is connected in parallel with the ohmmeter circuit, it will definitely be damaged DC direct current voltage measurement (such as the output voltage of the rectifier or the voltage of the central batteries) this mode is used to measure the voltage of a circuit such as rectifiers Or batteries are used. Ohm meters usually have different ranges to choose from In this case, the rotary selector switch of the ohmmeter is placed on the DC V-signal, on a higher range than the voltage value of the circuit being measured. And the wires of the ohmmeter are placed in parallel in the circuit, that is, they are connected to both ends of the device or battery to be measured. The connection point of the ohmmeter wires on the ohmmeter is the inputs (COM) and (mAΩV) accuracy if the number one is shown