The method of measuring voltage with multimeter
The method of measuring voltage with a multimeter first aligns the range switch within the range of the five gears marked with V (to test the AC voltage, align it with the gear of the AC voltage, and when testing the DC voltage, align it with the gear of the DC voltage). When measuring the voltage, the ammeter pen should be connected to the circuit under test. According to the approximate value of the circuit under test, select an appropriate range position. The maximum value of each dry battery is 1.5V, so it can be placed in the 5V range.
At this time, the 500 of the full scale reading of the hands on the panel should be read as 5. i.e. scaled down by a factor of 100. If the needle is at the 300 mark, it reads 3V. Note that the value indexed by the tip of the range switch is the corresponding value of the full-scale reading of the needle on the meter head. When reading the meter, you only need to convert it accordingly to read the real value. Except for the resistance range, all range switch ranges can read the measurement results in this way.
In actual measurement, if you cannot determine the approximate value of the measured voltage, you can turn the switch to the maximum range first, and then reduce the range step by step to a suitable position. Pay attention to the positive and negative polarity when measuring DC voltage. If the test leads are reversed, the test needles will reverse. If you don't know the positive and negative polarity of the circuit, you can set the range of Wantian meter to the maximum range, test it quickly on the circuit under test, and see how the pen needle deflects, you can judge the positive and negative polarity.
Measure 220V AC. Turn the range switch to AC 500V. At this time, the full scale is 500V, and the reading is read according to the scale 1:1. Insert the two test leads into the power socket, and the measured voltage value is at the scale where the hands point to. When measuring AC voltage, there is no difference between positive and negative test leads.
1. Measurement of DC voltage, such as battery, Walkman power supply, etc. First insert the black test lead into the "com" hole, and the red test lead into the "V Ω". Select the knob to a range larger than the estimated value (note: the values on the dial are the maximum range, "V-" means DC voltage range, "V～" means AC voltage range, "A" means current range), and then put Connect the test lead to the power supply or both ends of the battery; keep the contact stable. The value can be read directly from the display screen, if it is displayed as "1.", it indicates that the measuring range is too small, so it is necessary to increase the measuring range before measuring. If "-" appears on the left side of the value, it means that the polarity of the test lead is opposite to that of the actual power supply. At this time, the red test lead is connected to the negative pole.
2. Measurement of AC voltage. The test lead jack is the same as the measurement of DC voltage, but the knob should be turned to the required range at the AC gear "V~". There is no difference between positive and negative AC voltage, and the measurement method is the same as before. Regardless of measuring AC or DC voltage, pay attention to personal safety, and do not touch the metal part of the test lead with your hands.
