How does the universal meter use drops, how to use the universal meter?

Place one transfer switch of the universal meter in the AC and DC voltage block, and the other transfer switch in the appropriate range of the AC voltage, and the two meter pens of the universal meter can be connected in parallel with the circuit or load under test.

One of the most critical steps in using a multimeter is to turn the dial and select the appropriate range. The dial of a multimeter is generally divided into two circles, the inner ring is marked with the exact range, and the outer ring is marked with the measurement gear. When turning the dial, you need to select the measuring gear first.

Novice electricians use the universal meter method:

1. Measure the current.

Select the range according to the current in the circuit, test from large to small, insert the black watch pen into the "com" jack, insert the red watch pen into the appropriate gear jack, and finally connect to the circuit for measurement.

However, it is important to note that when measuring current, the multimeter and the circuit under test should be connected in series.

2. Measure the voltage.

First of all, you should judge whether it is DC voltage or AC voltage, insert the black watch pen into the "com" jack, and the red watch pen into the "V" jack, select the corresponding gear and range, and then connect the watch pen to the power supply or both ends of the battery to measure the voltage value.

To measure the voltage with a multimeter, the multimeter should be connected in parallel with the measured lines and equipment. The red pen is connected to the positive pole, and the black pen is connected to the negative pole, if it is reversed, the voltage value will be displayed as a negative value.

3. Measure the resistance.

Select the resistance gear and appropriate range, connect the red pen to the "V" jack, and the black pen to the "COM" jack, and use the pen to connect the metal parts at both ends of the resistance to complete the measurement.

4. Measure the capacitance value.

Turn the selector switch to "Capacitor Profile", insert the two pins of the discharged capacitor directly into the "C-X" jack of the meter board, select the appropriate range, and read the display data.

5. Measuring diodes.

The method of measuring the diode is the same as measuring the voltage, dial the dial of the multimeter to the diode gear, connect the red watch pen to the "V" jack, and connect the black watch pen to the "COM" jack, and select the measurement file.

When the red watch pen is connected to the positive electrode and the black watch pen is connected to the negative electrode, the multimeter reading is generally about the same; The reading is 0L when reversed, and the positive and negative poles of the diode can be judged from this.

If the positive and negative readings of the diode are both "or "0L", it means that the diode is damaged.

Pay attention to the use of multimeters

1) Before using the multimeter, "mechanical zeroing" should be carried out, that is, when there is no measured annual pin capacity, the multimeter pointer should be pointed at the position of zero voltage or zero current.

2) In the process of using the multimeter, do not touch the metal part of the meter 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.

3) When measuring a certain amount of electricity, it is not possible to shift gears at the same time as the measurement, especially when measuring high voltage or high current, more attention should be paid to it. 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.

4) When the multimeter is in use, it must be placed horizontally to avoid errors. At the same time, care should be taken to avoid the influence of external magnetic fields on the multimeter.

5) After the multimeter is used, the transfer switch should be placed in the maximum gear of AC voltage. If it is not used for a long time, the battery inside the multimeter should also be removed to avoid the battery from corroding other devices in the meter.

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.