Multimeters

Multimeters - Precise measuring devices for electronics and electrical installations

Definition and function of a multimeter

A multimeter is an essential measuring device that is able to measure various electrical quantities. These include voltage, current and resistance. Modern multimeters also often offer additional functions such as measuring capacitance, frequency or temperature. A multimeter can be available in both analog and digital versions, with digital versions dominating these days.

The functionality of a multimeter is based on the use of measuring probes that are plugged into the corresponding sockets of the device. By adjusting the rotary switch, you can select the desired type of measurement. The device then shows the measured value on a display, which enables precise and easy reading.

Applications of multimeters

Multimeters are extremely versatile and are used by both professionals and amateur electricians. In electrical installations, they are used for checking circuits, troubleshooting and ensuring proper connections. In electronics production and repair, they are also essential for testing the functionality of components and carrying out diagnostic work.

Multimeters are also indispensable tools in electrical engineering training and studies. They enable students to gain practical experience in measuring and analyzing electrical variables. In addition, multimeters are used in many other areas, for example in vehicle technology for testing vehicle electrical systems or in domestic technology for measuring heating controls.

Digital versus analog multimeters

Digital multimeters (DMMs) are the most commonly used today. They offer higher accuracy, better readability of the measured values and often additional functions compared to analog multimeters. A DMM shows the measured values on a digital display, which minimizes possible reading errors and ensures a more precise display.

Analog multimeters, on the other hand, use a moving-coil display instrument that shows the measured values using a pointer on a scale. These devices are more robust and can offer advantages in certain applications, such as monitoring rapidly changing signals. However, due to their lower accuracy and more difficult reading, they are now less common.

Important functions and features

Multimeters are equipped with a variety of functions, which can vary depending on the model. The basic functions include measuring direct and alternating voltage, direct and alternating current and resistance. Many models also offer a diode test, continuity tester and measurement of capacitance and inductance.

In addition, some multimeters have special features such as automatic range selection, true RMS measurement and the option of data logging. Such advanced functions increase the versatility and applicability of the device in various scenarios and industries.

Safety aspects when using multimeters

Safety should always be the top priority when using a multimeter. It is important to follow the manufacturer's instructions and observe the safety instructions provided. Before each measurement, you should ensure that the multimeter is set to the correct measuring function and the appropriate measuring range to avoid damage or incorrect measurements.

Particular care should be taken when measuring high voltages or currents. The use of suitable protective equipment and insulated test leads can reduce the risk of electric shock or short circuits. It is also advisable to regularly check the condition of the test leads and replace damaged components immediately.

Purchasing advice: What to look out for when buying a multimeter

When buying a multimeter, you should pay attention to a few important criteria to ensure that the device meets your requirements. These include the measuring accuracy, the measuring range and the available measuring functions. Another important factor is the robustness and build quality of the device, especially if it is to be used in harsh environments.

Also consider whether the multimeter offers additional functions such as data logging, PC interfaces or extended measurement options. Depending on the area of application, these features can be very important. Finally, you should also check the scope of delivery: Additional accessories such as carrying cases, test leads or hook clamps can extend the multimeter's range of applications and make it easier to use.

Care and maintenance of multimeters

The service life and reliability of a multimeter can be significantly extended through regular care and maintenance. After each use, the multimeter should be cleaned and inspected for visible damage. Store the device in a dry and clean place to prevent corrosion or other damage

Digital multimeter for various electrical measurements

The multimeter is the Swiss Army knife among electrical measuring instruments and is used to measure various electrical values. While inexpensive models can usually only measure AC/DC voltage (V), AC/DC amperage (A) and resistance (Ω), more expensive models often also have functions for measuring capacitance, frequency, duty cycle or temperature. Accordingly, when selecting a multimeter, first determine which measurement functions are needed. Likewise, one should consider the measuring range as well as the measuring accuracy of the individual measuring functions.

Finding the right multimeter based on (additional) functions

An important decision factor in selecting the right model is the screen resolution (counts). The higher the number of counts, the more precise the measurements. Digital multimeters also differ in the measuring range selection. While the measuring range must be determined manually in the case of manual range selection, the measuring range is determined by the multimeter itself in the case of automatic range selection.

The models also differ in terms of the other functions. For example, the non-contact voltage measurement (NCV) can be used to detect electrical voltages, the data hold function freezes measured values and the RMS measurement (True RMS) can be used to determine the equivalent DC value of an AC signal. Thus, True RMS instruments can correctly measure both sinusoidal and non-sinusoidal AC voltage signals. Many multimeters also have other features such as a continuity and diode test function, an LED work light, an auto power off function, or a battery test function. Likewise, additional features such as a rubber sheath to protect against drop damage, water and dust resistance (e.g. IP65) or the dimensions and operating concept of the multimeter can influence the final purchase decision.

Finding the right multimeter based on the CAT measurement category

As diverse as the functions of the multimeter, are also its areas of application. The areas in which a multimeter can be used depend on the CAT measurement category.

• Cat I: Measurement on devices without connection to the mains (e.g. battery operation). 
• Cat II: Measurement on devices connected to the normal, single-phase household mains. 
• Cat III: Measurement in the area of distribution boxes and three-phase installations. 
• Cat IV: heavy current applications.

Therefore, to find the perfect multimeter for you, you should consider both the application areas and the features you need when making your selection decision.

Our digital multimeter brands

Whether you are looking for a digital multimeter for occasional measurements at home or for daily professional use, you are sure to find the perfect device for your needs in our range of different brands and models. We also carry special multimeters for specific applications (e.g. optimized for field use in harsh working conditions). We are constantly expanding our selection of multimeters and have our finger on the pulse of time. Thus, in addition to the classic models, we can offer you directly as one of the first dealers the latest innovations.

Innovative digital multimeters from PCWork

Our own brand PCWork stands for innovative quality products at attractive prices. Our product team for PCWork loves to work with electronics themselves and has transferred this passion to the devices of PCWork. PCWork covers everything from the low-priced entry-level model PCW01A, to the all-round model PCW02A, to our top model PCW03A with extensive functions and an innovative design. We are one of the first brands to offer our customers intelligent multimeters in smartphone design, which means that you can already purchase future multimeters of the next generation from us. Whether for teaching physics, for hobby use or for professional application, PCWork offers a suitable multimeter.

Premium Digital Multimeter from UNI-T (UNI-TREND)

For more than 30 years UNI-T, as one of the most renowned manufacturers in the world, has been producing high-quality premium measuring instruments in various price categories. UNI-T offers affordable entry-level models such as the UT131C, all-round classics such as the UT139C, innovations such as the UT60EU, UT60BT or UT123D and absolute professional devices such as the UT161E. The digital multimeters offer a wide range of functions, are of premium quality and stand out from the crowd with innovative as well as high-quality designs. End users from all over the world appreciate UNI-T for their reliable measuring instruments at a reasonable price.