What are the method of judging the probable fault position of the pointer multimeter?

First, fault judgment method

Before repairing, a new battery is put into the meter. The multimeter is placed in the Rx × 1n R × 10 R × 100 or R × 1k block, and the two tables are briefly connected to see if the needle has any indication. If not indicated, it is generally due to an open circuit of the fuse (0.5 A) or the head coil.

Second, the method of judging whether the coil is damaged or not.

An electric soldering iron is used to weld one end of the gauge, and a good multimeter is placed in R × 1k to measure its resistance. At the same time, the deflection of the gauge head is observed. If the internal resistance of the head coil is 0 Ω or ∞ and the gauge head is not deflected, the fault of the gauge head can be judged; the internal resistance is 0 Ω, which indicates the coil short circuit; the internal resistance is ∞, indicating the coil open circuit; The meter does not deflect, indicating that it is open or jammed by foreign bodies, and should be further checked.

Third, the problems that need to be explained.

When the multimeter failure is repaired,, the simple and obvious parts should be repaired first, and then the more complicated parts should be repaired according to the circuit schematic diagram. In addition, check the fuse, battery capacity or any obvious wire breakage, notice whether there are hidden dangers. As long as we can carefully analyze and understand the basic principles and characteristics of the multimeter, we can achieve the goal of quick repair with good will and double the result with half the effort.

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