First, the disassembly tool
1, the screwdriver (also called a screwdriver or a screwdriver):
Cross screwdriver
A screwdriver
Other shapes (depending on the screw)
2, pliers
Pliers: mainly used for clamping small cap screws, steel wire strands, the sharp mouth made for cutting wire
Tiger: the main role and clamp pliers are basically the same
Diagonal pliers: used to cut thin wire or welding the excess thread trimming
Stripping pliers: the main tool used to quickly strip the wire outside plastic bag line, used to note the selected aperture, do not make knife cut inside the metal core wire
Two, measuring tool
1, test pencil: to test the measured object is electrified, if the object is charged in pencil will make the neon light, used shidianbi test charged object, such as a neon bulb inner electrode end glow, the direct current is a current, such as a neon bulb, both ends of the inner electrode are glow. The electric current.
2, ten thousand meters: mainly used to measure the AC DC voltage, current, DC resistance and transistor current amplification. There are now a common digital universal meter and mechanical two meters.
(1) digital universal meter
In the universal table will see the conversion knob, knob refers to the amount of the file:
V~: that is the test of the AC voltage profile
V-: that is the measurement of DC voltage stalls
MA: indicates the position of the DC voltage.
(R): indicates the position of the measured resistance
HFE: represents the number of transistors to measure the current amplification
The red pen of the universal meter is connected with the positive electrode of the external circuit, and the black pen indicates the negative electrode of the external circuit. Advantages: antimagnetic, convenient and accurate readings (digital display
(2) mechanical Wan
There are some differences between the appearance and the digital table of mechanical type, but they are similar to the rotary knob, and the gear position is basically the same. On the mechanical watch, there is a dial, and there are eight scales on the dial:
The scale used for measuring resistance is marked with "ohm".
Marked "~" mark is the measurement of AC and DC voltage.
Marked "HFE" is used to measure the size of the measuring tube.
Marked "LI" is a measure of the current of the load.
Marked with "DB" mark is the scale of the measurement scale
(3) the use of a table
Digital universal meter: measurement before the first hit to the measurement of gear, to pay attention to the gear is the subject of the range, that is, the maximum value
Mechanical type universal meter: measuring current and voltage method and mathematical formula, but the measurement of Yin, the reading should be multiplied by the value of the gear is measured value. For example: now hit gear is "X100" reading is 200, the measurement is =20K 200X100=20000, dial on the "ohm" is from the left to the right, from large to small, and the other is from the left to the right, from small to large
(4) note
Adjust the "zero" (mechanical table only), used in the table, we see the pointer refers to the left of "zero", if not, it should be slowly rotating screwdriver case central "zero starting point" calibration screw, so that the pointer refers to zero.
When using the table should be placed horizontally (mechanical only)
To determine the content before the test, the range switching knob to the corresponding measurement shown in position, so as not to burn the header, if you do not know the size of the measured physical quantity, must start from the large range test.
To correct the pen inserted in the corresponding socket
During the test, do not rotate the shift knob
After use, be sure to change the gear shift knob to the maximum range of the AC voltage range.
The measured DC voltage and current, should pay attention to the positive and negative voltage and current flows, and connected with the pen (when) right
Three, welding tools
1, for the original welding clamp forceps
2, knife with dry remove oxide layer on the original and dirt
3, tin suctioner: the role of the excess tin removed, there are two common: (1) with heat source; (2) without heat source
4, the electric iron melting tin welding: Tools
(1) generally divided into external heat type, heat type two
(2) the purchase of new iron plating a layer of tin in iron
(3) matters to be noted in welding:
Good command of the electric iron with temperature, when the incense smoke in birch ferrochrome supple white smoke, and not creak when welding best
Control welding time, do not be too long, it will damage the components and circuit boards
Remove the dirt on the welding joints, the original in the process of removing the oxide layer and the rosin and tin tin in advance
Four, other supplies
1, solder: welding supplies, in the middle of the tin with rosin
2, rosin: remove oxide welding supplies
3, the flux effect and rosin, but better than good but because of rosin, flux containing acidic, so use the original should use alcohol wipe, to prevent corrosion.
