Multimeter mechanical zero adjustment methods and steps
How to mechanically adjust a multimeter to zero
How to mechanically zero an electronic multimeter. I don't know how to mechanically zero an electronic multimeter. A simple mechanical zeroing method for an analog multimeter:
First open the back cover of the multimeter, you can see: pointer, moving coil, hairspring, etc. The end point of the outer ring of the hairspring is welded on the downturned column, and the upper part of the downturned column is a rotatable ring. Zero adjustment is to turn the fork left and right. Use a blade or screwdriver to turn the knob. (If it is detached, it cannot be mechanically zeroed.) Just reset it.
There is a circular plastic in the center under the glass surface of the multimeter, which can be adjusted with a flat-blade screwdriver so that the pointer can be adjusted to the static zero position when the multimeter is not in use. This is called mechanical zero adjustment.
Multimeter mechanical zero calibration
Place the multimeter flat on a relatively horizontal surface, not on plexiglass or a table with static electricity. Use a flat-blade screwdriver to slowly adjust the plastic screw under the dial, and adjust the needle to the zero position on the left. It is best to shake it. Three times, adjust it three times, and it will return to zero after each shake.
Multimeter, also known as multiplex meter, multimeter, three-purpose meter, multimeter, etc., is an indispensable measuring instrument in power electronics and other departments. It is generally used to measure voltage, current and resistance as its main purpose.
Multimeters are divided into pointer multimeters and digital multimeters according to their display modes. They are multi-functional and multi-range measuring instruments. Generally, multimeters can measure DC current, DC voltage, AC current, AC voltage, resistance and audio level. Some can also measure DC current, DC voltage, AC current, AC voltage, resistance and audio level. Measure AC current, capacitance, inductance and some parameters of semiconductors (such as β).
Place the multimeter flat on a relatively horizontal surface, not on plexiglass or a table with static electricity. Use a flat-blade screwdriver to slowly adjust the plastic screw under the dial, and adjust the needle to the zero position on the left. It is best to shake it. Three times, adjust it three times, and it will return to zero after each shake.
What should I do if my multimeter cannot be set to zero mechanically?
The pocket multimeter I just bought cannot be mechanically adjusted to zero. After adjusting it for a while, it is still at 25 volts and cannot go to 0 volts.
Solution:
1. Replace the multimeter with a new one.
2. Repair by yourself: Open the upper cover of the watch and you can see: hands, moving coil, hairspring, etc. The end point of the outer ring of the hairspring is welded to the hanging column, and the upper part of the hanging column is a rotatable ring with a fork at the end. The watch is linked to each other, and zeroing is to turn the forked watch left and right. There is a zero-setting button on the watch cover. There is an eccentric protrusion at the bottom of the zero-adjusting button. The eccentric protrusion should be inserted into the fork with the fork. If it is disconnected, mechanical zero adjustment cannot be performed. Just reset it.
