Digital display multimeter, I want to get started and learn to use?

How to use a multimeter, how to use a multimeter, and a tutorial to get started with a multimeter.

What is the use of a digital multimeter.

A digital multimeter is a relatively simple measuring instrument. In this article, the author will teach you the correct way to use a digital multimeter. Start with the measurement methods of voltage, resistance, current, diode, transistor, MOS FET and other measurement methods of the digital multimeter, so that you can better grasp the measurement methods of the multimeter.

Before use, you should carefully read the relevant instruction manuals and be familiar with the functions of power switches, range switches, jacks, and special sockets.

Put the ON OFF switch to the ON position, check the 9V battery, if the battery voltage is insufficient, it will be displayed on the display, then the battery needs to be replaced. If your display doesn't show up, follow these steps.

The symbol next to the test pen jack indicates that the input voltage or current should not exceed the indicated value, which is to protect the internal wiring from damage.

Before the test. The function switch should be set to your desired range.

Digital multimeters are displayed in numbers.

parameter value. Figure 9-11 shows the general outline of the digital multi-purpose return table. The DMM has a clear and intuitive display, stable performance, and high sensitivity and accuracy. Here's how to use it:

Figure 9-11 Digital multimeter.

When measuring DC current with a digital multimeter, first insert the black watch pen into the "com" hole, when the measured current is greater than 200mA, the red watch pen should be inserted into the "10A" jack, and turn the knob to the DC "10A" block; When the current to be measured is less than 200mA, insert the red watch pen into the "200mA" jack and turn the knob to the appropriate range within "200mA" DC.

Once the range is selected, the multimeter is threaded into the circuit and the reading is made when it is stable. If the value on the screen is "1", the range should be increased and then measured; If there is a "—" on the left side of the value, it means that the current flows from the black pen to the multimeter, and the two pen pens can be swapped. When measuring AC voltage with a digital multimeter, the gear should be hit to the AC block, and the connection method is the same as measuring DC voltage.

Here's how to use it:

Let's take a look first. 2.In the resistance mode, the red pen is inserted in the V socket and the black watch pen is inserted in the COM socket. Measure both ends of a circuit or device.

It must not be electrified, otherwise the multimeter will be burned out. ）

3.DC voltage level, the same resistance level measurement method.

4.AC voltage range, the same resistance level measurement method.

5.AC current setting, red pen plugged in MA or 10A socket, black pen plugged in COM socket. String a multimeter into the circuit for measurement.

6.DC current gear, red pen plugged into MA or 10A socket, black gauge pen plugged into COM socket. String a multimeter into the circuit for measurement.

7.Diode level, same resistance level measurement.

1: Measure the diode, such as the multimeter shows 1, exchange the meter pen to measure again, then the multimeter shows a few tenths of a day, indicating that the diode is good. This value is the positive pressure drop of the tube.

Silicon around, germanium material around. If the two measurements are the same, then the tube is bad.

2. Measure the on-off or short-circuit of the line. If there is a short circuit or path, the buzzer emits a sound.

Note: During the use of the multimeter, you should not touch the metal part of the watch pen with your hands, so that on the one hand, you can ensure the accuracy of the measurement, and on the other hand, you can also ensure personal safety.

It is not possible to shift gears at the same time as the measurement, especially when measuring high voltages or currents. Otherwise, the multimeter will be destroyed. If you need to change gears, you should disconnect the watch pen first, and then go to measure after changing gears.

Be sure to estimate the measured value before measuring, if you can't estimate it, start with the maximum gear and then decrease the gear measurement.

After use, turn the gear knob to the highest voltage to prevent the next use, the gear is incorrect and damages the multimeter. and turn off the power.

How to use a DMM:

Tool: Digital multimeter.

1. In the AC gear, turn the transfer switch to the V gear, and the pen is divided into red and black.

2. The red is connected to the positive pole, the black is connected to the negative pole, and the voltage value can be displayed by inserting the two meter pens into the power socket hole.

3. DC gear, DC voltage is the voltage rectified by electronic components, and the common DC voltages are: +5V, +12V, +24V, -12V, etc.

4. When measuring, turn the transfer switch to V, connect the red pen to the measurement point and the black pen to the ground, and the current DC voltage is displayed on the screen.

5. Ohm gear, this gear is to measure the resistance, turn the switch to, the red and black touch the metal parts at both ends of the resistance, and the screen can display the resistance value.