Hello everyone, the classroom class has started again.

Earlier, we learned in detail the tips of the digital multimeter, so let’s talk about the pointer -type multimeter today.

Some friends may say that now the era has developed so fast, digital multimeter has been widely used, and pointer -type multimeter is meaningless, but in fact, pointer -type multimeter still has its unique advantages and is still in use.

For example, test pulse data, or it takes a short time test, or a pointer -type multimeter will be better. Digital reactions are too slow. The advantage of the pointer universal meter is that its pointer swings, which can very intuitive reflection of changes in the attributes of the measured objects.

In addition, for the small partners who want to understand the principle of multi -meter table, the study of pointer -type universal meters is clear and thorough.

Let’s explain the operating guide in detail with the pointer -type multimeter of the MF47 model.

Instrument model

: MF47 (MF500)

Manufacturer : Nanjing Tianyu Instrument Company

Operation refers to South:

one,

effect

The

It is used to measure AC voltage, AC current, DC voltage, DC current, resistance, and triode polarity.

Figure 1 pointer -type multimeter

How to use

Measured resistance 1. Insert the red wire form of the multimeter to the positive polarity ” +” holes, insert the black wire pins to the negative polarity ” -” hole, and hit the multimeter to the Om (ω) file.

2. Choose a multimeter range. From small to large, the Ohm file is: pitch, × 1, × 10, × 100, × 1k, × 10K.

3. Check the universal watch Ohm file status before measuring. When the popular black table is open, the universal table needle is not moving, indicating in the “∞” position, indicating infinitely large; At this time, adjust the “0Ω · adj” knob on the upper right corner of the surface to 0 (as shown in the figure below). 4. During the measurement, the red and black table pens are point to both ends of the measured lines or components, and the readings indicate by the pointer (the first row of ω scale).

5. Measure the resistor r = dial read × selected gear resistance power.

Measure AC voltage 1. Insert the red wire meter of the multimeter to the positive polarity ” +” holes, insert the black wire pins to the negative polarity ” -” hole, and hit the multimeter to the AC voltage (ACV ~) gear.

2. Select the range, and the AC voltage range is from small to large.

3. During the measurement, the volume range must be greater than the measurement voltage. When the voltage level is not clear, the maximum voltage voltage range (1000V) should be selected for testing, and then the accurate range should be selected according to the reading.

4. Point the red and yellow tabs to the naked parts of the tested line or equipment, and read the pointer indicating the voltage value (the dial is scaled from top to bottom).

5. The voltage scale is 10, 50, and 250, respectively. When the selection of these three gears, you only need to read directly from the dial scale; The magnification (such as 500/10 or 500/50 or 500/250) is the actual real voltage value. If you use a 500V voltage gear to test 250V voltage, the pointer indicates the scale line 125 in the middle of 100 and 150, the measured voltage value = 125 × (500/250) = 250V, or indicates that from the 20 and 30 intermediate scale line 25, the measured measurement is measured. Voltage = 25 × (500/50) = 250V.

Measure DC voltage

1. Insert the red wire meter of the multimeter to the positive polarity ” +” holes, and insert the black wire pins to the negative polarity “-” hole, and the multimeter is hit to the DC voltage (DCV-) gear.

2. Select the range, the DC voltage range from small to large in order: 0.25, 1, 2.5, 10, 50, 250, 500, 1000, five gears.

3. When measured, the volume range must be greater than the measurement voltage. When the voltage level and the positive and negative electrode of the power supply are not clear, the maximum voltage voltage range (1000V) should be selected for testing. After the replacement, the test is tested, and then the accurate range is selected according to the reading.

4. The measurement reading is the same as the AC voltage. Measurement AC current

1. Insert the red wire meter of the multimeter to the “10A” hole, insert the black wire patch to the negative polarity “-” hole, and hit the multimeter to the DC current (DCMA-) gear.

2. Select the range, and the “500” gear in the gear represents the maximum range, 10A.

3. String the multimeter into the circuit during measurement.

4. The reading voltage is the same as the AC voltage.

Measure DC current

1. Insert the red wire form of the multimeter to the polarity “+” holes, insert the black wire pins to the negative polarity “-” hole, and hit the DC current (DCMA-) gear.

2. Select the range, the DC current gear range is: 0.5mA, 10mA, 50mA, and 500mA from small to large.

Third, precautions

1. Be careful when carrying and using the instrument to avoid severe vibration. 2. After the use of the multimeter, the gear should be hit to the maximum gear of the AC voltage.

3. When reading, the eyes are above the surface of the surface, and the number of acupuncture points and dial mirror needles are read.

4. When the multimeter measuring the resistance, the meter pen is slow. It may be that the battery is out of power. The multimeter battery needs to be replaced. 5. When selecting the range, the needle is the most accurate between the read number of 1/5 to 4/5.

6. When measuring the resistance of the line or component, first break the measured line or equipment power supply, and determine that there are obvious disconnection points at both ends. It is strictly forbidden to use the resistance of the measuring line or equipment or whether it is turned on.

7. Before measurement, check the measurement gear and range, and it is strictly forbidden to measure the voltage and current with a multimeter resistance file.

8. During the voltage and current measurement, the multimeter is stable before the measurement. Check whether the acupuncture is in “0”. If it is not 0, gently pat the universal meter to see if the table can be returned to 0 places. When you digit, you must adjust the “zero -position adjustment” knob to the universal meter to return to the “0” line (as shown below).

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3. String the multimeter into the circuit during measurement.

4. The reading voltage is the same as the AC voltage.

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