Starting from scratch and using a multimeter correctly, a white person can easily measure circuits!

Proper measurement will make your maintenance more efficient. Have we ever measured 5V to 6V or 7V with a multimeter when repairing? Measured 12V to 14V?

The main problem is because your multimeter for the use of network operation and management is not appropriate, on the one hand, the man-made operation of their own ways and means of reason, there is also the enterprise on the one hand, our multimeter gear selection of the reasons for the analysis as well as the multimeter's own reasons,how to test pcb board with a multimeter？ so that in the maintenance of the need for reasonable measurements, as well as selecting the right gear for your instrument is very important and critical.

Today we use the digital multimeter as a reference

The multimeter consists of a multimeter body and measuring stylus, the stylus is black and red, connected to the negative and positive terminals of the unit under test respectively.

The black meter stylus is permanently connected to the COM hole, and the red meter stylus is connected to the corresponding jack according to the measurement needs. 20A under the measurement object The red meter stylus is connected to 20A, and the measurement time should not exceed 3 seconds, otherwise the multimeter will be damaged. When measuring current below 20A, the red meter pen connects to the MA jack, when measuring voltage resistance and line on-off, the red meter pen connects to the V ω jack.

When measuring current with a multimeter.

Rotate to the system current gear, the measured current from the red and black stylus for both ends at the same time to access the

1. Insert the stylus into the appropriate hole

2. Estimate the current and rotate to the appropriate gear. If unsure, select a larger range and then choose the exact gear according to the measured value.

3. When measuring, the digital meter connected in series with the measured device displays the corresponding measured value. The selected gear is too large when it is 0, and too small when it is 1. The symbol in front indicates that the direction of the current is opposite to that of the measuring stylus. If there is no response, check that the links and gears are correct.

Note the difference between measuring AC and DC gears. Generally only DC gears are needed for on-board circuits.

Four gears on the digital technology on behalf of China these four gears can flow through the maximum value of the operating current, pay attention to the measurement of the current through the table is strung into the circuit to be measured, the meter pen usage, the black pen does not move, the red pen, respectively, according to the students to estimate the size of a current capacity, pcblink 1oz vs 2oz Copper inserted into the mA or A holes, the conversion relationship between the formula 1A = 1,000mA.

When measuring voltage with a multimeter:

Multimeter shift rotate to voltage shift, red and black pens are connected to the ends of the device under test.

1. Insert the needle into the corresponding hole.

2. Estimate the voltage, select the appropriate gear, can not determine the priority is to choose a large, to choose the exact gear according to the measurement

3. Measurement, it will be connected in parallel with the measured equipment, digital recognition of the corresponding measured value. When it is 0, the gear is selected too large, and when it is 1, the gear is selected too small. The symbol indicates that the actual direction of the voltage is opposite to the direction of the measuring probe.

Measurement of the same first distinguish to carry out AC / DC, 6 gears on the digital technology on behalf of these 6 gears can control the flow of the maximum operating voltage value, pay attention to the measurement of the safety voltage is the table and into the circuit under test, the red pen was inserted into a labeled VΩ holes, the unit can be converted, the conversion relationship between the formula 1000V=1000V,1V=1000mV .

When measuring resistance with a multimeter:

Turn the multimeter to the ohm position.

1. Insert the stylus into the corresponding hole

2. Estimate the resistance and select the corresponding stop. It is uncertain whether a larger stop is selected for the initial measurement and then adjusted according to the measurement results.

3. The measuring device must be in the power-off state, otherwise the measurement results are provided by other devices

4. The numerical identification corresponding to the measured value. When it is 0, the gear selection is too large, and when it is 1, the gear selection is too small.