What is a plug-in resistor box?How to use plug-in resistor box
A plug-in resistor box is a test device composed of resistor sheets with different resistances. Each resistor sheet has a different resistance, ranging from a few ohms to several megaohms. It realizes the plug-in mode through the gear selector switch, and controls the on and off of resistors with different resistance values. When the plug is inserted into the circuit, it will change the resistance value of the circuit, thereby achieving the purpose of testing the working status of the circuit.
There is a row of copper blocks on the cover of the plug-in resistor box. There are jacks between the copper blocks, and copper plugs are inserted into the holes. There is a resistor wire connecting the two adjacent copper blocks under the jack. When the copper plug is inserted into the hole, it connects two adjacent copper blocks together, and the current passes through the copper block, short-circuiting the resistance wire below, and the current will not flow through the resistance wire below.
When the copper plug is pulled out, current passes through the resistor wire inserted underneath. The more copper plugs you pull out, the greater the resistance you put into the circuit. The resistance value of the resistor wire under each jack is marked next to the jack. Just add the values next to the jacks without copper plugs, which is the resistance value of the circuit the resistance box is connected to. As shown in the figure, the resistance value of the resistor box connected to the circuit is 10Q+20Q=30Q.
Plug-in resistor boxes are very easy to use, you just need to follow these steps:
1. Determine the range of resistor values you require and select the appropriate plug-in resistor box. Plug-in resistor boxes usually have a fixed resistance range, so make sure it matches your needs before choosing one.
2. Insert the plug-in resistor box into the appropriate slot on the circuit board or lab bench. Please make sure you connect it correctly to the positive and negative poles of the circuit when plugging it in.
3. Use control methods such as knobs or toggle switches to adjust the resistance value of the plug-in resistance box. Depending on your needs, adjust the resistor value step by step to get the desired value. Some plug-in resistance boxes may have a display or scale that can be used to show the current resistance value.
4. After adjusting the resistance, use an experimental instrument (such as a multimeter) to measure to confirm the set resistance value.
In addition to plug-in resistor boxes, there are a number of other types of resistor boxes available, including:
1. Knob-type resistance box: This kind of resistance box usually has a knob or toggle switch, and the resistance value is adjusted by rotating or toggle. They are suitable for applications requiring precise adjustment and control of resistor values.
2. Digital resistance box: The digital resistance box is characterized by a digital display screen, which can directly input the resistance value, making the adjustment more accurate and convenient. They often feature high precision and versatility.
3. Precision resistance box: Precision resistance box is specially designed for applications requiring high accuracy and reliability, such as laboratories, calibration and special testing. They typically have lower temperature coefficients and higher accuracy requirements.
4. Surface mount resistor box: Surface mount resistor box is suitable for surface mount technology (SMT) circuits. It is small in size and can be soldered directly to the circuit board.
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