How to maintain a multimeter from getting wrong reading

How to maintain a multimeter from getting wrong reading

A technician is only as accurate as the measuring equipment he uses. If the equipment is used incorrectly or is defective, the measurements will be inaccurate. If the measurement is inaccurate, the technician will draw the wrong conclusions. To avoid inaccurate readings, handle, use and store the measuring equipment correctly. Always turn off the multimeter when not in use to prolong battery life.

Precautions when handling and using the meter.

These precautions apply to both digital and analog meters.

Do not drop the meter.

Do not overload the meter. If in doubt, choose a higher range that you know will not overload. If necessary, you can always switch to a lower range.

Do not move precision instruments around. Have precision instruments serviced by a qualified technician.

Make sure that the range switch is in the correct position before connecting the instrument to the circuit.

Carefully check the circuit connections before opening the meter.

Be careful not to touch any other electronic components inside the meter.

Be careful not to touch the probe tips while they are connected to something else.

Never change the configuration (e.g., from voltage to current) when the probe is connected to a circuit.

The two main types of meters are analog and digital (Figure 1). Although these two types of meters have the same function, they look different.

Analog and digital multimeters Figure 1: Analog and digital multimeters.

As you can see, the difference is in the display. Digital multimeters are usually easier to use and more accurate than analog multimeters, which is why they are becoming more and more popular. We will focus on the digital multimeter (DMM), as it is the most commonly used, although in some cases an analog multimeter is preferred, for example when monitoring rapidly changing values.

Handling the multimeter

Multimeter securely attached to the pipe When handling a multimeter it is best to ensure that it is securely attached. Multimeters, especially analog multimeters, can be dropped from even a small height, which can affect future readings and the accuracy of the multimeter. When reading data, the user will likely have to use both hands to complete the task. Therefore, care should be taken to ensure that the meter is placed in a safe location where it can be read without the user having to change position. If a suitable location is not available, a second person may be required to hold the meter and/or record the readings. Some meters may also be equipped with a magnetic strip or belt to facilitate use by a single technician.

Storage

The multimeter should be stored in a dry place where it will not be physically damaged. Most multimeters are supplied with a carrying case. This case not only keeps all components in one place (meter, cables, batteries, batteries, tape, etc.), but also protects sensitive components, such as the display, from damage.

If you store your multimeter for a long time, you should remove the batteries to prevent corrosion from forming on the battery terminals.

Cables for multimeters can be of different lengths. Be especially careful not to damage the internal connections of the cables when coiling them tightly.