| Display | LCD display |
| Display type (analog/digital) | Digital display |
| Measurement possibilities | DC voltage DC current Frequency Show all Temperature thermocouple type K Temperature thermocouple type J Temperature thermocouple type E Temperature thermocouple type T |
Multimeter
A multimeter is used to measure various electrical quantities: Voltage, current, resistance, frequency,... . In the classical sense, it is a device equipped with all the necessary operating and display elements to be operated by one person. In order to be used in the seminar as a device for the acquisition and digitization of sensor signals, it must be equipped with an analog to digital converter that is integrated into an internal microcontroller system. This system must also include an interface for external data transfer. Such a device is called a digital multi meter.
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| Type/installation | Handheld instruments |
| Display | Graphic display (monochromatic) |
| Display type (analog/digital) | Digital display |
| Internal measurement value memory size | 100 Messwerte |
| Display | Graphic display (monochromatic) |
| Display type (analog/digital) | Digital display |
With regard to the embedding of a multimeter in a computer-aided measuring system, not only the purely electrical specifications such as sensitivity, measuring range, input impedance ... the properties of the digital system are also a decisive selection criterion. The latter includes, for example, the ability to process even complex measurement cycles independently and only then to transfer the data or results accumulated in the device (for example in pass-fail protocols) in block form. A very important criterion is the possibility of synchronization with other components of the measuring system. Especially in large measurement systems, such capabilities are considered much more important compared to the electrical qualities.
What is a multimeter and what is it used for?
A multimeter is an electronic measuring device used to measure electrical quantities such as voltage, current and resistance. It normally consists of a display on which the measured values are shown, as well as various measuring cables and connections.
A multimeter can be used in various fields, such as electrical engineering, electronics, the automotive industry and household electronics. It can be used to measure the voltage at a socket, to check the current flow through an electrical circuit, to measure the resistance of a component or to check continuity and capacitance. Multimeters are therefore an indispensable tool for electricians, electronics engineers and other professionals who work with electrical systems.
A multimeter can be used in various fields, such as electrical engineering, electronics, the automotive industry and household electronics. It can be used to measure the voltage at a socket, to check the current flow through an electrical circuit, to measure the resistance of a component or to check continuity and capacitance. Multimeters are therefore an indispensable tool for electricians, electronics engineers and other professionals who work with electrical systems.
How does a multimeter work and what measured variables can it record?
A multimeter is an electronic measuring device that can record various measured variables. It usually consists of a display area on which the measured values are displayed and various measuring cables or measuring probes to establish the electrical contacts.
A multimeter can record the following measured variables, among others:
1. DC voltage (DC voltmeter): A multimeter can measure the voltage in a circuit, for example the battery voltage of an appliance.
2. AC voltage (AC voltmeter): It can also measure the voltage in an AC circuit, as used in household sockets, for example.
3. Direct current (DC ammeter): A multimeter can measure the current flow in a circuit, for example the current flowing through a circuit.
4. Alternating current (AC ammeter): It can also measure the alternating current flow in a circuit, as used in household appliances, for example.
5. Resistance (ohmmeter): A multimeter can measure the resistance of an electrical component, for example the resistance of a resistor or a cable.
6. Capacity (capacity meter): It can also measure the capacitance of a capacitor used in electronic circuits.
There are also multimeters that have additional measuring functions, such as measuring frequency, temperature or continuity testing.
To carry out a measurement, the measuring cables or measuring probes of the multimeter are connected to the corresponding contacts or components of the circuit to be measured. The multimeter then shows the measured value on the display area.
A multimeter can record the following measured variables, among others:
1. DC voltage (DC voltmeter): A multimeter can measure the voltage in a circuit, for example the battery voltage of an appliance.
2. AC voltage (AC voltmeter): It can also measure the voltage in an AC circuit, as used in household sockets, for example.
3. Direct current (DC ammeter): A multimeter can measure the current flow in a circuit, for example the current flowing through a circuit.
4. Alternating current (AC ammeter): It can also measure the alternating current flow in a circuit, as used in household appliances, for example.
5. Resistance (ohmmeter): A multimeter can measure the resistance of an electrical component, for example the resistance of a resistor or a cable.
6. Capacity (capacity meter): It can also measure the capacitance of a capacitor used in electronic circuits.
There are also multimeters that have additional measuring functions, such as measuring frequency, temperature or continuity testing.
To carry out a measurement, the measuring cables or measuring probes of the multimeter are connected to the corresponding contacts or components of the circuit to be measured. The multimeter then shows the measured value on the display area.
What types of multimeters are there and what are the differences between them?
There are different types of multimeters, which have different attributes depending on their intended use and functionality. Here are some common types of multimeters:
1. Analog multimeter: This type of multimeter displays readings on a scale and uses moving pointers to read the measurements. They are generally suitable for basic measurements such as voltage, current and resistance.
2. Digital multimeter (DMM): This type of multimeter shows measured values on a digital display. They are generally more accurate and offer a wider range of measurement functions compared to analog multimeters. DMMs can offer additional functions such as capacitance measurement, frequency measurement, temperature measurement and transistor tests.
3. Compact multimeter: This type of multimeter is small and handy, making it ideal for use on the move or in confined spaces. They are usually equipped with the basic measuring functions and can also serve as a flashlight or power source.
4. True RMS multimeter: True RMS multimeters can not only accurately measure the RMS value of sinusoidal signals, but also the RMS value of non-sinusoidal signals. They are therefore more accurate and versatile when measuring alternating current.
5. Industrial multimeter: This type of multimeter is designed for use in industrial environments and has additional functions and protective measures to meet the requirements of these environments. They can have robust housings, shock-resistant attributes and higher measuring accuracy.
6. Wireless multimeter: This type of multimeter enables the wireless transmission of measurement data to a mobile device or computer. They offer a convenient way of carrying out measurements remotely and saving the data for later analysis.
The differences between the various types of multimeters lie mainly in their functions, the accuracy of the measurements, the area of application and the price. Depending on the user's specific requirements, the choice of multimeter may depend on the type of measurements, the environment in which it will be used and the budget.
1. Analog multimeter: This type of multimeter displays readings on a scale and uses moving pointers to read the measurements. They are generally suitable for basic measurements such as voltage, current and resistance.
2. Digital multimeter (DMM): This type of multimeter shows measured values on a digital display. They are generally more accurate and offer a wider range of measurement functions compared to analog multimeters. DMMs can offer additional functions such as capacitance measurement, frequency measurement, temperature measurement and transistor tests.
3. Compact multimeter: This type of multimeter is small and handy, making it ideal for use on the move or in confined spaces. They are usually equipped with the basic measuring functions and can also serve as a flashlight or power source.
4. True RMS multimeter: True RMS multimeters can not only accurately measure the RMS value of sinusoidal signals, but also the RMS value of non-sinusoidal signals. They are therefore more accurate and versatile when measuring alternating current.
5. Industrial multimeter: This type of multimeter is designed for use in industrial environments and has additional functions and protective measures to meet the requirements of these environments. They can have robust housings, shock-resistant attributes and higher measuring accuracy.
6. Wireless multimeter: This type of multimeter enables the wireless transmission of measurement data to a mobile device or computer. They offer a convenient way of carrying out measurements remotely and saving the data for later analysis.
The differences between the various types of multimeters lie mainly in their functions, the accuracy of the measurements, the area of application and the price. Depending on the user's specific requirements, the choice of multimeter may depend on the type of measurements, the environment in which it will be used and the budget.
How do I calibrate a multimeter and how accurate are the measurement results?
To calibrate a multimeter, you need special calibration tools and procedures. It is recommended that this is carried out by a specialist, as calibration can be complicated and requires special knowledge.
The accuracy of the measurement results of a multimeter depends on various factors, such as the quality of the device, the measuring range, the ambient temperature and the calibration of the multimeter. High-quality multimeters can offer an accuracy of around 0.1% to 0.5%. The accuracy of cheaper models may be slightly lower.
It is important to note that the accuracy in the upper range of the measuring range is often lower than in the lower range. It is therefore advisable to use the multimeter in the range that is closest to the quantity to be measured in order to achieve the best results.
It is also important to check the multimeter regularly and recalibrate it if necessary to ensure that the measurement results are reliable and accurate.
The accuracy of the measurement results of a multimeter depends on various factors, such as the quality of the device, the measuring range, the ambient temperature and the calibration of the multimeter. High-quality multimeters can offer an accuracy of around 0.1% to 0.5%. The accuracy of cheaper models may be slightly lower.
It is important to note that the accuracy in the upper range of the measuring range is often lower than in the lower range. It is therefore advisable to use the multimeter in the range that is closest to the quantity to be measured in order to achieve the best results.
It is also important to check the multimeter regularly and recalibrate it if necessary to ensure that the measurement results are reliable and accurate.
What safety precautions should I take when using a multimeter?
The following safety precautions should be observed when handling a multimeter:
1. Before using the multimeter, the condition of the device should be checked to ensure that it is in perfect working order and is not damaged.
2. The multimeter should only be used by qualified persons who are familiar with the basics of electrical engineering.
3. Before measuring, the multimeter should be set to the correct measuring range to avoid overloading.
4. Make sure that the multimeter has the correct category and dielectric strength to withstand the respective measurements.
5. Before connecting the multimeter to a circuit or device, the power supply should be switched off and the plug removed.
6. When measuring voltages, always use the correct connections (e.g. red test lead to the positive terminal and black test lead to the negative terminal).
7. Always wear the appropriate protective equipment such as insulated gloves and safety goggles when measuring voltages and currents.
8. Avoid contact with live parts and insulate them before measuring if necessary.
9. Make sure that the test leads are not damaged or worn, as this can lead to incorrect measurement results or even dangerous situations.
10. Once the measurements have been completed, the test leads should be stored safely to prevent damage.
11. Observe the operating instructions for the multimeter and follow the manufacturer's instructions.
12. If there are any doubts or problems, the multimeter should no longer be used and a specialist should be consulted.
1. Before using the multimeter, the condition of the device should be checked to ensure that it is in perfect working order and is not damaged.
2. The multimeter should only be used by qualified persons who are familiar with the basics of electrical engineering.
3. Before measuring, the multimeter should be set to the correct measuring range to avoid overloading.
4. Make sure that the multimeter has the correct category and dielectric strength to withstand the respective measurements.
5. Before connecting the multimeter to a circuit or device, the power supply should be switched off and the plug removed.
6. When measuring voltages, always use the correct connections (e.g. red test lead to the positive terminal and black test lead to the negative terminal).
7. Always wear the appropriate protective equipment such as insulated gloves and safety goggles when measuring voltages and currents.
8. Avoid contact with live parts and insulate them before measuring if necessary.
9. Make sure that the test leads are not damaged or worn, as this can lead to incorrect measurement results or even dangerous situations.
10. Once the measurements have been completed, the test leads should be stored safely to prevent damage.
11. Observe the operating instructions for the multimeter and follow the manufacturer's instructions.
12. If there are any doubts or problems, the multimeter should no longer be used and a specialist should be consulted.
What additional functions can modern multimeters have?
Modern multimeters can have a variety of additional functions. Some of them are:
1. Temperature measurement: Some multimeters can measure the ambient temperature or be extended with an external temperature sensor.
2. Frequency measurement: Multimeters can measure the frequency of electrical signals, for example AC and DC waveforms.
3. Capacitance measurement: Some multimeters can measure and display the capacitance of capacitors.
4. Continuity test: Multimeters can trigger an audible alarm if a circuit is closed or interrupted.
5. Data logger function: Some multimeters can record and store data over a certain period of time.
6. True RMS measurement: Multimeters can measure the actual (effective) RMS voltage or current in AC circuits.
7. Auto-Range function: Multimeters can automatically select the appropriate measurement range to maximize measurement accuracy.
8. Bluetooth connectivity: Some multimeters can be connected wirelessly to a smartphone or tablet to record or analyze measurement data.
9. Backlight: Multimeters can have a backlight to make it easier to read the measured values in poor lighting conditions.
10. Protective functions: Modern multimeters can have overload protection and safety functions such as voltage and current limiting to protect the user from dangerous conditions.
1. Temperature measurement: Some multimeters can measure the ambient temperature or be extended with an external temperature sensor.
2. Frequency measurement: Multimeters can measure the frequency of electrical signals, for example AC and DC waveforms.
3. Capacitance measurement: Some multimeters can measure and display the capacitance of capacitors.
4. Continuity test: Multimeters can trigger an audible alarm if a circuit is closed or interrupted.
5. Data logger function: Some multimeters can record and store data over a certain period of time.
6. True RMS measurement: Multimeters can measure the actual (effective) RMS voltage or current in AC circuits.
7. Auto-Range function: Multimeters can automatically select the appropriate measurement range to maximize measurement accuracy.
8. Bluetooth connectivity: Some multimeters can be connected wirelessly to a smartphone or tablet to record or analyze measurement data.
9. Backlight: Multimeters can have a backlight to make it easier to read the measured values in poor lighting conditions.
10. Protective functions: Modern multimeters can have overload protection and safety functions such as voltage and current limiting to protect the user from dangerous conditions.
Which manufacturers of multimeters are particularly recommended and popular?
There are various manufacturers of multimeters that are particularly recommended and popular. Here are some of them:
1. Fluke: Fluke is one of the best-known manufacturers of measuring instruments and multimeters. They offer a wide range of high-quality and reliable multimeters for professional applications.
2. Brymen: Brymen is a Taiwanese manufacturer known for its precise and durable multimeters. They are valued by electricians and electronics engineers worldwide.
3. Amprobe: Amprobe is a renowned manufacturer of measuring instruments and multimeters. They offer a good selection of reliable and affordable multimeters for various applications.
4. Klein Tools: Klein Tools is an American manufacturer of hand tools and measuring instruments. Their multimeters are known for their robustness and accuracy and are often used by electricians.
5. Extech: Extech is a manufacturer of measuring instruments for various applications, including multimeters. They offer a wide range of multimeters with different functions and price ranges.
It is important to note that the choice of multimeter depends on your specific requirements and applications. It is advisable to compare different models and read customer reviews to find the right multimeter for your needs.
1. Fluke: Fluke is one of the best-known manufacturers of measuring instruments and multimeters. They offer a wide range of high-quality and reliable multimeters for professional applications.
2. Brymen: Brymen is a Taiwanese manufacturer known for its precise and durable multimeters. They are valued by electricians and electronics engineers worldwide.
3. Amprobe: Amprobe is a renowned manufacturer of measuring instruments and multimeters. They offer a good selection of reliable and affordable multimeters for various applications.
4. Klein Tools: Klein Tools is an American manufacturer of hand tools and measuring instruments. Their multimeters are known for their robustness and accuracy and are often used by electricians.
5. Extech: Extech is a manufacturer of measuring instruments for various applications, including multimeters. They offer a wide range of multimeters with different functions and price ranges.
It is important to note that the choice of multimeter depends on your specific requirements and applications. It is advisable to compare different models and read customer reviews to find the right multimeter for your needs.