The basic functions and usage of a multimeter
MF47 type multimeter is a portable multi-range multimeter of magnetoelectric rectification system. It is novel in design and easy to use. It can be used to measure DC current, AC and DC voltage, DC resistance, etc. It has 26 basic ranges and levels, capacitance, inductance, 7 additional reference ranges such as transistor DC parameters. The multimeter uses a magneto-electric high-sensitivity meter head with stable working performance; the entire test circuit is reliable, wear-resistant and easy to maintain; the measuring mechanism is protected by silicon diodes, which will not damage the meter head when overloaded, and the circuit is equipped with a 0.5 A melting point. The wire prevents the circuit from being burned out during misoperation; it has the function of humidity and frequency compensation; the low-power blocking selects No. 2 dry battery, which has large capacity and long life; equipped with a transistor static DC amplification factor detection device; dial scale scale line and block The position switch knob indicator discs are all red, green and black, respectively made according to AC red, transistor green, and the rest black. There are 6 dedicated scale lines, which are separated for easy reading; equipped with reflective aluminum film to eliminate parallax , Improve the accuracy of readings. Except for the separate sockets for AC and DC 2 500 V and DC 5 A, the others only need to turn the selector switch, which is easy to use; the handle is easy to carry and can be tilted when necessary for easy reading.
1. The composition of an analog multimeter
The multimeter is composed of three parts: mechanical part, display part and electrical part. The mechanical part includes the housing, gear switch knobs and brushes, etc. The meter head is the display part, and the electrical part is composed of measuring circuit boards, potentiometers, resistances, diodes, capacitors and other parts. The display meter of the PCB physical pointer multimeter of the MF47 type multimeter is a DC meter, and the WH potentiometer can adjust the current in the meter loop, 0 and D, two diodes are connected in parallel with the capacitor after anti-parallel connection, which is used to limit The voltage overload at both ends of the meter head protects the meter head so that the meter head will not be burnt out due to excessive voltage and current. The other components of the multimeter are the public display part, the DC current part, the DC voltage part, the AC voltage part, and the resistance part. The schematic diagram of the structure distribution of each gear is shown in Figure 1-1.4: AC voltage block, DC voltage block, DC mA block, electrical barrier (electric barrier is divided into X1., xlO., xlOO., xlkO, x 10 kfl 5 ranges) When the switch is set to a certain range, it forms a loop with a certain resistance to deflect the meter head, and then the resistance value of the resistance can be measured. When the transfer switch is set to the DC current block, it can be connected to 5 contact points respectively, and can measure the DC current of 500 mA, 50 mA, 5 mA and 500 jxA, 50 |xA range; when the transfer switch is set to the DC voltage block It can measure DC voltages in the ranges of 0.25 V, 1 V, 2.5 V, 10 V, 50 V, 250 V, 500 V, and 1000 V; AC voltage of 50 V, 250 V, 500 V, 1 () 00 V range.The basic functions and usage of a multimeter
MF47 type multimeter is a portable multi-range multimeter of magnetoelectric rectification system. It is novel in design and easy to use. It can be used to measure DC current, AC and DC voltage, DC resistance, etc. It has 26 basic ranges and levels, capacitance, inductance, 7 additional reference ranges such as transistor DC parameters. The multimeter uses a magneto-electric high-sensitivity meter head with stable working performance; the entire test circuit is reliable, wear-resistant and easy to maintain; the measuring mechanism is protected by silicon diodes, which will not damage the meter head when overloaded, and the circuit is equipped with a 0.5 A melting point. The wire prevents the circuit from being burned out during misoperation; it has the function of humidity and frequency compensation; the low-power blocking selects No. 2 dry battery, which has large capacity and long life; equipped with a transistor static DC amplification factor detection device; dial scale scale line and block The position switch knob indicator discs are all red, green and black, respectively made according to AC red, transistor green, and the rest black. There are 6 dedicated scale lines, which are separated for easy reading; equipped with reflective aluminum film to eliminate parallax , Improve the accuracy of readings. Except for the separate sockets for AC and DC 2 500 V and DC 5 A, the others only need to turn the selector switch, which is easy to use; the handle is easy to carry and can be tilted when necessary for easy reading.
1. The composition of an analog multimeter
The multimeter is composed of three parts: mechanical part, display part and electrical part. The mechanical part includes the housing, gear switch knobs and brushes, etc. The meter head is the display part, and the electrical part is composed of measuring circuit boards, potentiometers, resistances, diodes, capacitors and other parts. The display meter of the PCB physical pointer multimeter of the MF47 type multimeter is a DC meter, and the WH potentiometer can adjust the current in the meter loop, 0 and D, two diodes are connected in parallel with the capacitor after anti-parallel connection, which is used to limit The voltage overload at both ends of the meter head protects the meter head so that the meter head will not be burnt out due to excessive voltage and current. The other components of the multimeter are the public display part, the DC current part, the DC voltage part, the AC voltage part, and the resistance part. The schematic diagram of the structure distribution of each gear is shown in Figure 1-1.4: AC voltage block, DC voltage block, DC mA block, electrical barrier (electric barrier is divided into X1., xlO., xlOO., xlkO, x 10 kfl 5 ranges) When the switch is set to a certain range, it forms a loop with a certain resistance to deflect the meter head, and then the resistance value of the resistance can be measured. When the transfer switch is set to the DC current block, it can be connected to 5 contact points respectively, and can measure the DC current of 500 mA, 50 mA, 5 mA and 500 jxA, 50 |xA range; when the transfer switch is set to the DC voltage block It can measure DC voltages in the ranges of 0.25 V, 1 V, 2.5 V, 10 V, 50 V, 250 V, 500 V, and 1000 V; AC voltage of 50 V, 250 V, 500 V, 1 () 00 V range.
