AC voltage measurement: put one switch of the multimeter in the AC and DC voltage, and the other switch is placed on the appropriate range of the AC voltage. The multimeter's two test leads and the circuit under test or load can be connected in parallel. DC voltage measurement: put one switch of the multimeter in AC and DC voltage, the other switch is placed on the appropriate range of DC voltage, and the “+†meter (red meter) is connected to the high potential, “-†The test pen (black pen) is connected to the low potential, that is, the current flows from the "+" meter pen and flows out from the "-" meter pen. If the test leads are reversed, the pointer of the watch will deflect in the opposite direction, which is easy to bend the pointer. 2. Measuring current: When measuring DC current, put one switch of the multimeter in the DC current block, and the other switch is placed on the appropriate range of 50uA to 500mA. The range selection and reading method of the current is the same as the voltage. The circuit must be disconnected first, and then the multimeter is connected in series to the circuit under test according to the current from "+" to "-", that is, the current flows from the red meter pen and flows out from the black meter pen. If the multimeter is connected in parallel with the load, the internal resistance of the meter head is small, which may cause the short circuit to burn the instrument. The reading method is as follows: Actual value = indication value × range / full deviation 3. Measuring resistance: When measuring resistance with a multimeter, it should be operated as follows: Choose the right override. The scale of the multimeter's ohmic gear is not uniform, so the selection of the override gear should be such that the pointer stays in the thinner part of the scale, and the closer the pointer is to the middle of the scale, the more accurate the reading. Under normal circumstances, the pointer should be pointed between 1/3~2/3 of the scale. Ohm zero adjustment. Before measuring the resistance, short the two test leads and adjust the “ohmic (electrical) zero adjustment knob†so that the pointer just points to the zero position to the right of the ohmic scale. If the pointer cannot be adjusted to zero, the battery voltage is insufficient or there is a problem inside the meter. And every time you change the override gear, you must perform ohms zero again to ensure accurate measurement. Reading: The reading of the meter is multiplied by the magnification, which is the resistance of the measured resistance. AC voltage measurement: put one switch of the multimeter in the AC and DC voltage, and the other switch is placed on the appropriate range of the AC voltage. The multimeter's two test leads and the circuit under test or load can be connected in parallel. DC voltage measurement: put one switch of the multimeter in AC and DC voltage, the other switch is placed on the appropriate range of DC voltage, and the “+†meter (red meter) is connected to the high potential, “-†The test pen (black pen) is connected to the low potential, that is, the current flows from the "+" meter pen and flows out from the "-" meter pen. If the test leads are reversed, the pointer of the watch will deflect in the opposite direction, which is easy to bend the pointer. 2. Measuring current: When measuring DC current, put one switch of the multimeter in the DC current block, and the other switch is placed on the appropriate range of 50uA to 500mA. The range selection and reading method of the current is the same as the voltage. The circuit must be disconnected first, and then the multimeter is connected in series to the circuit under test according to the current from "+" to "-", that is, the current flows from the red meter pen and flows out from the black meter pen. If the multimeter is connected in parallel with the load, the internal resistance of the meter head is small, which may cause the short circuit to burn the instrument. The reading method is as follows: Actual value = indication value × range / full deviation 3. Measuring resistance: When measuring resistance with a multimeter, it should be operated as follows: Choose the right override. The scale of the multimeter's ohmic gear is not uniform, so the selection of the override gear should be such that the pointer stays in the thinner part of the scale, and the closer the pointer is to the middle of the scale, the more accurate the reading. Under normal circumstances, the pointer should be pointed between 1/3~2/3 of the scale. Ohm zero adjustment. Before measuring the resistance, short the two test leads and adjust the “ohmic (electrical) zero adjustment knob†so that the pointer just points to the zero position to the right of the ohmic scale. If the pointer cannot be adjusted to zero, the battery voltage is insufficient or there is a problem inside the meter. And every time you change the override gear, you must perform ohms zero again to ensure accurate measurement. Reading: The reading of the meter is multiplied by the magnification, which is the resistance of the measured resistance. Class 2 Power Adapter 15V,Ac Dc Adapter 15V,15V 2A Ac Dc Adapter,Ac/Dc 15V 2A Power Adapter ShenZhen Yinghuiyuan Electronics Co.,Ltd , https://www.yhypoweradapter.com
1. Measurement voltage: When measuring voltage (or current), select a good range. If you use a small range to measure large voltage, there is a danger of burning the watch. If you use a large amount of process to measure small voltage, the pointer deflection is too small. reading. The range should be chosen to deflect the pointer to about 2/3 of the full scale. If you do not know the magnitude of the voltage to be measured beforehand, you should first select the highest range and then gradually reduce it to the appropriate range.
1. Measurement voltage: When measuring voltage (or current), select a good range. If you use a small range to measure large voltage, there is a danger of burning the watch. If you use a large amount of process to measure small voltage, the pointer deflection is too small. reading. The range should be chosen to deflect the pointer to about 2/3 of the full scale. If you do not know the magnitude of the voltage to be measured beforehand, you should first select the highest range and then gradually reduce it to the appropriate range.
Method for measuring voltage, current and resistance by multimeter
The multimeter uses a sensitive magneto-electric DC ammeter (micro-ampere meter) to make the meter. When a small current passes through the meter, there is a current indication. However, the meter head cannot pass a large current, so it is necessary to shunt or step down some resistors in series with the series head to measure the current, voltage and resistance in the circuit. Next, Xiaobian will tell you how to measure voltage, voltage and current with a multimeter: