How can a faulty multimeter's electric barrier be fixed?
If the multimeter is damaged, another multimeter should be checked and repaired according to the inspection results.
The faults of the multimeter's electric barrier damage are usually: resistance burnout, value change, 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.
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.
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 resistance gear pointer of mf47 multimeter
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.
