How to repair the electric barrier of the multimeter is broken?
How to repair the electric barrier of the multimeter is broken?
If the multimeter is damaged, another multimeter should be checked and repaired according to the inspection results.
The failure of the multimeter's electric barrier damage is usually: resistance burnout, variable value, poor contact of the gear position, poor contact of the fine-tuning resistor, poor battery contact, etc.; after opening the back cover, use the multimeter to test all relevant parts that affect the resistance gear. The fault can be found by measuring. If there is a circuit diagram, it is best to find it according to the circuit diagram. After the problem is found, the replacement of the damaged parts is completed.
How to repair the electric resistance of the pointer multimeter?
The damage of the electric barrier of the multimeter is generally caused by the damage caused by the wrong measurement of the voltage with the electric barrier.
The damaged component is generally the resistor on the relevant resistance file. You can take a look at the multimeter, and you will generally see that the color of the resistor on the file where the voltage has been measured with the resistor file has changed. Just change the resistor. up.
How to repair the burnout of the resistance file of the digital multimeter
If the other files of the watch are still working, it means that you burned it when you used the low-resistance file. The problem is not big, just find the voltage dividing resistor of the electric cathode in the meter and replace it with a high-precision resistor with the same resistance value.
This resistor is easy to spot:
1. It should be visible from the appearance that it is burned
2. Turn the gear position of the watch to the position where you were burning at that time, and find it along the contact of the switch, it is nearby
How to repair the multimeter resistance file pointer does not move
If the pointer multimeter can measure other measurements, but the pointer of the resistance gear does not move, you should check:
1. The resistance gear band switch is in poor contact.
2. The adjustable resistor (zero-adjustment fine-tuning, and some wire-wound fine-tuning) is short-circuited.
3. The shunt and step-down resistors are desoldered or burned.
The following is the circuit schematic diagram of the multimeter:
The ohm gear of the multimeter is broken, how to repair it
1. The first is to directly measure the resistance, let's talk about the traditional multimeter first. Turn the pointer to the gear as shown in the picture (ohm gear Ω). This is the gear for measuring resistance.
2. The starting position 0 of the current and voltage readings is on the left, and the starting position 0 of the resistance is on the right. Find the dial line of the resistance reading, and the reading will be read from here later.
3. Connect the two nibs of the multimeter and see if the pointer points to the 0 position. If the multimeter does not have a mechanical adjustment, turn it to zero (if it cannot be adjusted to 0, the battery is dead)
4. Place the two nibs at both ends of the resistance to measure the reading. At this time, the resistance value is read out. This method cannot measure the insulation resistance. Resistance value = gear position × reading For example, the gear position is 100Ω and the reading is 30, which is 3K ohms.
5. The digital type is simpler, just set the gear to the ohm range and read.
