The voltmeter is a kind of instrument for voltage measurement. It has the advantages of stable performance, high measurement accuracy, easy maintenance, high reliability and flexible use. Users need to master the correct use method when using the product. The following small series will introduce the correct use of the voltmeter. I hope it can help everyone.
How to use the voltmeterFirst, the connection method of the voltmeter:
(1): Observe whether the pointer points to the “zero†scale line. If not, you need to adjust the zero adjustment button to first adjust the pointer to “zeroâ€.
(2): The voltmeter must be connected in parallel with the appliance under test.
note
1. If the voltmeter and the device under test are connected in series, the voltmeter display will be equal to the power supply voltage, and the small bulb will not illuminate.
2. The voltmeter can be directly connected between the two levels of the power supply so that the voltage value of the power supply can be measured.
(3) The current must be allowed to flow from the positive side of the voltmeter (red terminal) and then out of the negative (black terminal).
Note: If the positive and negative poles of the voltmeter are reversed, the pointer will be reversed.
(4): The range of the voltmeter must be correctly selected.
note:
1: Can estimate the voltage level again, first estimate, choose the appropriate range.
2: When it is impossible to estimate, use the test method to select the range.
The specific operation method of the test touch range:
(1): Firstly connect the range of 0-15v, quickly close and open the switch, and observe whether the pointer exceeds the scale of the maximum range. If it exceeds the need to switch to a larger range of voltmeters.
(2): If the deflection of the pointer does not exceed the range, but the voltage representation is greater than 3v, it should be connected to the range of 0-15v. (3): If the voltage representation is less than 3v, it should be connected to the range of 0-3v.
Second, the voltmeter reading:
(1): Defining the range of the selected voltmeter. (According to the wiring)
(2): See the scale value of each range: the range of 0-3v, the scale value is 0.1v.
The range of 0-15v, the division value is 0.5v.
(3): Read the readings. (clear the number of grids where the pointer is deflected to the right)
Note: The range of the range from 0 to 3v = 0.1 v × the number of grids deflected.
The range indication of 0-3a = 0.5 v × the number of grids deflected.
Reminder: At the same scale line, the display of a large range is equal to 5 times the display of a small range.
The voltmeter is used. The voltmeter is an instrument that we usually measure voltage. We need to correctly understand the voltage and its unit and voltmeter readings and how to use it. Through the experimental operation, the voltage law in the series and parallel circuits is obtained, and the knowledge and safe operation of using these laws are strengthened.
1. Let us first understand the digital voltmeter. Generally, the voltmeter has 3-4 terminals, one negative terminal (red wire column), and two -3 positive terminals (black wire column).
2. When measuring voltage, we must connect the voltmeter to the two ends of the circuit to be tested; the positive and negative terminals must be connected correctly; to select the appropriate range, confirm the voltmeter range to be measured in advance, and cannot exceed Limited. Parallel in the circuit.
3. In the parallel connection test, the value obtained is displayed on the small window of the display with a value of 1.570V. as the picture shows.
4, we have already seen the appearance and usage of the digital voltmeter above, here we will come to understand the appearance of the ordinary scale voltmeter, as shown.
5, we take the test dry battery as an example to test the use of the ordinary scale voltmeter: here is still a parallel method to do experiments to see the changes in the value.
6. The positive and negative poles should be connected correctly, and the method of connecting the positive and negative terminals of the digital voltmeter is similar; the range should be correctly selected, and the voltmeter range to be measured should be confirmed in advance, and the limit should not be exceeded. Let's take a look at the last change in the value on the dial is not obvious, as shown.
7, we will choose the voltage range 15V positive terminal test to see, at 15V, each large grid on the dial is 5V, each small grid is 0.5V; let us look at how many grids on the dial , you know, as shown.
8. When we select the voltage range of 3V, each large grid on the dial is 1V, and each small grid is 0.1V. Let's see how many grids have passed on the dial, and we will know. The resulting value is 1.5V as shown. If it is a series connection, the final result is the power supply electromotive force. The method of using the series and parallel methods is similar, so I won't say it here.
Things to watch out for when using a voltmeter
When measuring the voltage, we must connect the voltmeter to the two ends of the circuit to be tested; the positive and negative terminals must be connected correctly; to select the appropriate range, confirm the voltmeter range to be measured in advance, and not exceed the limit.
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