how to measure 4-20 ma using multimeter

| |

If you’re working with 4-20 ma current loops, you’ll need to know how to measure the current using a multimeter. Here’s a quick guide on how to do it.

Introduction

An ammeter is a device used to measure the current in a circuit. An ammeter must be connected in series with the circuit to be measured. A multimeter is an instrument that can measure multiple electrical properties, including current. To use a multimeter to measure current, you must first set it to the “amps” or “current” setting.

What is a multimeter?

A multimeter is a device that can measure multiple electrical properties, including voltage, current, and resistance. Multimeters are often used to troubleshoot electrical problems in a circuit.

How to use a multimeter to measure 4-20mA

To measure 4-20mA current you need a multimeter that can read tailored to this range. You also need to know which terminal of your current loop you’re looking at. You will also need a barrel connector or another means of connecting your multimeter leads to the terminals you’re testing.

1) Set your multimeter to the mA range. On some models, there is a dedicated mA setting. Others may have an AC/DC current selection with an mA knob below it.
2) Connect the black lead of the multimeter to the common/ground terminal of your 4-20mA loop. This is typically labeled “-” or “COM.”
3) Connect the red lead of the multimeter to the live/hot/high terminal of your 4-20mA loop. This is typically labeled “+” or “V.” If using a barrel connector, make sure the male end is connected to this terminal and that the ground wire from your 4-20mA loop is terminated on this end as well
4) Note the reading on your multimeter display

Why measure 4-20mA?

4-20mA is the standard signal used in process control and manufacturing to measure variables such as pressure, flow, level, and temperature. It is easy to install, use, and maintain because it is a low voltage signal that can be run over long distances without the need for expensive wiring or repeaters. Multimeters are often used to measure 4-20mA signals because they are designed to measure current.

Advantages of using a multimeter

Advantages of using a multimeter
-You can use a multimeter to measure current, voltage, and resistance.
-A multimeter can also be used to test continuity, or whether a circuit is complete.
-Multimeters are relatively inexpensive and easy to use.

Disadvantages of using a multimeter

One of the main disadvantages of using a multimeter is that they are not always accurate. This is because they measure the average voltage or current over a period of time, and this can cause fluctuations in the readings. Another disadvantage is that multimeters can be damaged easily by static electricity, so they need to be handled with care.

Conclusion

It is important to know how to measure 4-20 ma current loops with a multimeter because this is a common type of signal used in industrial applications. Many devices that use 4-20 ma current loops are not properly calibrated, so it is important to be able to measure the actual current flowing through the loop.

There are two ways to measure 4-20 ma current loops with a multimeter. The first way is to use the multimeter in its ammeter mode by attaching the multimeter leads in series with the loop. This will give you a direct reading of the current flowing through the loop. The second way is to use the multimeter in its voltmeter mode by attaching the multimeter leads in parallel with the loop. This will give you a reading of the voltage across the loop, which you can then convert to a current value using Ohm’s Law.

Previous

how to measure amps with a multimeter

how to find a short circuit with a multimeter

Next

Leave a Comment