What are the methods of handling problems encountered during using pointer multimeters?

Some practical problems associated with detection are sometimes encountered when using an pointer multimeter. The common problems are dealt with as follows.

1. handling of difficulties in pointer zeroing.

After a long time of use, pointer zeroing is sometimes encountered. The concrete performance is that the pointer is either ahead or lagging. When faced with this situation, you can use the following methods to deal with.

First, the processing method.

Remove the back cover of the pointer multimeter, dip proper amount of anhydrous alcohol (95% or more) in the soft velvet cloth that does not shed hair, scrub the zero wire around the resistor arc top and slide on the surface, then rotate the knob contact arm a few times, the problem can be solved by making the contact reliable.

Second, fault cause.

This is mainly due to the prolonged and frequent adjustment of the multimeter, which increases the contact roughness between the contact arm of the zero regulator and the resistance wire surface or is tainted. Causes the gauge needle to appear in the contact jump in the small range following the contact arm at zero to make the gauge needle indication wrong.

2. methods of preventing the breakage of the line of the watch pen.

Although the wire used in the pointer multimeter looks thicker, its internal copper core is often less, and the texture is often hard. In repeated use, the two pencil wires are easily wound, and easily broken at the connection between the wire and the watch pen.

First, the use of speaker lines to prevent the breakage of the pen line.

Replace the dial line of the pointer multimeter with a sound box line of the appropriate length to prevent the pen line from breaking. Because the front line of sound is two groups of parallel and more than 50 strands of flat conductors in each group, the conductance of the wire is good, the elasticity and toughness of the wire body are better, and the insulation strength is also high.

Second, production method.

 Take a certain length of the speaker line according to the need, then pull the two wires at one end of the speaker line about 100mm, then weld the plug that the original watch pen is connected with the socket of the multimeter, and then use a little silica gel to fix it. Tear the other end of the speaker line at about 200m―300 mm and weld it firmly with the original multimeter bar.

This article is from Allicdata Electronics Limited. Reprinted need to indicate the source.