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What is the difference between a measuring device and a testing device?

The difference between a measuring device and a testing device essentially results from the application purpose and the display of information: While a measuring device (measuring instrument) primarily provides quantitative data, a testing device performs a qualitative assessment of the measurement results or supports the tester in evaluating them and in complying with standards and regulations. Measuring devices are generally used for quantitative measurements of physical quantities such as length, temperature, voltage, current, pressure and other parameters. Testing devices are mainly used for qualitative checks or tests to determine whether certain objects, systems or functions meet the specified standards or specifications. Testing devices can also be used for troubleshooting and to confirm the functionality of devices or systems. Since some instruments have both measuring and testing functions, the terms may merge. In contrast to measuring devices, testing devices may not be calibrated for absolute accuracy, but rather serve to fulfil certain criteria.

Where are testing devices used?

The areas of application for testing devices cover a wide range of industries. They make a significant contribution to quality assurance, safety, and efficiency in processes. Tests and inspections are extremely important because undetected faults, for example in the design of electrical systems, can not only cause high costs but can also be life-threatening. Below are some examples of the areas in which testing devices are used:

In industry, testing devices are primarily used for monitoring production processes and quality assurance in the manufacture of products.
In electrical engineering, they are used to measure and analyse electrical parameters, to test electronic components and circuits and to inspect printed circuit boards and devices.
Testing devices also play an important role in the automotive industry, for example in checking electronic systems, sensors, and other vehicle components as well as in general quality assurance in production.
In medicine and healthcare, testing devices ensure the functionality of medical devices and instruments as well as the material quality of implants. Testing devices are also used to analyse pharmaceutical products.
In construction and architecture, testing devices support the inspection of structures such as bridges and buildings as well as the testing of building materials such as concrete, steel and wood.
Testing devices are also used extensively in environmental technology, where they record parameters such as air and water quality as well as emissions and pollutants and monitor recycling and disposal processes.
In the energy sector, testing devices are used to test components in power plants and monitor energy generation plants.

What types of testing devices are there?

Various testing devices are used in measurement technology to test the safety and functionality of electronic components and devices, systems, and machines as well as processes. The following tools are particularly important and are therefore used frequently:

Earth testing devices also known as earth meters, earth resistance meters or earth testers are used to measure the earth resistance of an electrical system or device. The earthing resistance indicates how well an object or system is connected to earth. A low earthing resistance is important to ensure efficient earthing and thus the safe discharge of electrical currents. Earthing meters are used to check that electrical systems and devices are properly earthed, to localise faults in earthing systems and to monitor the stability and efficiency of earthing systems. The correct earthing of lightning protection systems is crucial for the safety of people and buildings. Earthing meters ensure that lightning conductors and earthing systems have a sufficiently low resistance to earth. In some industries, regular testing and certification of earthing systems is mandatory. Earthing meters are used here to verify conformity with safety standards and norms.
VDE testing devices are special devices for testing electrical safety in accordance with the standards of the German Association for Electrical, Electronic and Information Technologies (VDE). They play a central role in the safety assurance and conformity testing of electrical products and systems. They support manufacturers, installers, and testing institutes in complying with VDE standards and thus ensuring the safe use of electrical systems.
Grid and energy analysers monitor electrical networks by precisely measuring parameters such as voltage, current, frequency and power factor. They also focus on harmonics, which can indicate unwanted harmonic oscillations. The devices focus on optimising energy efficiency in various environments. They measure the energy consumption of individual appliances, identify energy losses, and take into account transients, i. e. short-term current or voltage peaks. The detection of transients enables potential damage to be recognised at an early stage and countermeasures to be implemented. Grid and energy analysers play a crucial role in the proactive maintenance and optimisation of electrical systems. They also take the distortion factor into account to enable precise and reliable performance evaluation. This contributes to cost-efficient operation and the responsible use of energy.
The aim of light measurement technology is to quantify and analyse the various aspects of light. An important instrument in this area is the luxmeter, which measures illuminance in lux. Luxmeters are used in various applications, including architecture, workplace design, photography, and plant growth. They help to ensure optimum lighting conditions for human activities or specific applications. Another key tool in light measurement technology is the spectrometer. It breaks light down into its spectral components and enables light sources to be analysed. This is crucial for colourimetry, material testing, light source characterisation and quality assurance in industries such as lighting and electronics. Spectrometers are also indispensable in research, for understanding the spectrum of light sources and develop innovative technologies. Overall, luxmeters and spectrometers help to optimise lighting conditions, improve visual perception, and make the use of light in various applications more efficient and targeted.

In addition to standard testing devices, dataTec also offers devices for special measurements. These include devices for measuring rotating field and motor direction, vibrations, field strength, material hardness and moisture as well as for photovoltaic applications and network analyses.

Where are VDE testing devices used for?

VDE testing devices are mainly used for the following purposes

Safety tests: VDE testing devices are used here to check electrical devices and systems. They ensure that electrical products comply with the applicable safety standards and do not pose any danger to users.
Conformity tests: VDE testing devices are used to carry out conformity tests on electrical devices and components to ensure that they comply with the specified regulations and standards.
Insulation tests: As part of insulation tests, VDE testing devices ensure that electrical cables and components are sufficiently insulated and do not conduct any unauthorised current.
Protective measure tests: VDE testing devices are used here to check protective measures such as protective conductor resistance and protective conductor current to ensure safe operation.
Electromagnetic compatibility (EMC): VDE testing devices can also be used to measure and assess electromagnetic compatibility. These tests ensure that electrical devices do not cause any unauthorised interference and are that they are not sensitive to such interference.
Electrical installation tests: In electrical installations, VDE testing devices are used to check whether cabling, switch cabinets and other electrical components comply with safety standards.

What is the purpose of the VDE standards?

The VDE standards, published by the German Association for Electrical, Electronic and Information Technologies (VDE), are intended to establish uniform technical standards and safety regulations in electrical engineering and information technology. The standards define how electrical devices, systems and installations should be designed, manufactured, and operated to ensure the safety of users, promote interoperability, and guarantee technical quality. For OEMs and suppliers, technical test standards also ensure that their products fulfil the requirements on energy efficiency and environmental protection. Modern measuring instruments and safety testing devices support the correct implementation of VDE standards and directives. Prescribed test sequences can be simplified and also be automated.

What VDE standards are there?

The VDE standards are part of the DIN standards (DIN: German Institute for Standardisation). It is extremely comprehensive and is subject to constant adjustments, additions, and updates. A complete list of all relevant standards is therefore not expedient. The following list provides an overview of the most important VDE regulations for electrical systems and equipment that are relevant for the use and utilisation of VDE testing devices:

VDE 0100: contains the test specifications for stationary low-voltage installations
VDE 0105: contains the test specifications for stationary and mobile electrical installations (low voltage to high voltage
VDE 0113: contains the test specifications for the electrical equipment of machines and machine systems
VDE 0544: contains the test specifications for arc welding equipment
VDE 0701: covers the verification of the effectiveness of the protective measures of electrical equipment after repair
VDE 0702: covers the verification of the effectiveness of the protective measures of electrical equipment in the sense of a recurrent test
VDE 0751: contains the test specifications for recurrent tests and testing after the repair of medical electrical equipment (medical technology)

What are the advantages of VDE testing devices?

VDE testing devices feature a range of benefits that help to ensure the safety, quality, and conformity of electrical devices and systems:

Fulfilment of safety standards: VDE testing devices help to ensure that electrical products and installations meet the highest safety standards, which in turn minimises the risk of damage and injury.

Conformity to standards: VDE testing devices guarantee conformity with VDE standards and other relevant national and international standards, resulting in a high-quality standard.

Product quality assurance: By using VDE testing devices, manufacturers can monitor the quality of their products and ensure that they meet the specified requirements.

Efficiency in troubleshooting: VDE testing devices support fast and efficient troubleshooting in electrical systems and devices, which leads to improved operational reliability.

Certification and proof of conformity: The use of VDE testing devices makes the certification process and proof of conformity of their products easier for manufacturers.

Accident prevention: Regular testing with VDE testing devices can identify potential hazards and prevent accidents, especially in connection with electrical systems and devices.

What special features do testing devices have?

Depending on their type and purpose, testing devices have special features that make them suitable for specific tasks. VDE testing devices, for example, have no pointer instruments, only a digital display, because pointer instruments cannot be read precisely.

Some other special features of testing devices include:

Testing devices are generally versatile and can be used for various types of measurements and tests.
Testing devices are often robustly built to withstand the demands of industrial environments and outdoor use.
Some testing devices enable particularly fast measurements and tests, which supports efficient inspections in production and during maintenance work.
Depending on the application, testing devices can offer specialised measurement functions, e.g. for electrical, mechanical, thermal, and chemical parameters.
Modern testing devices are generally designed to be very user-friendly and have intuitive user interfaces and simple instructions.
Some testing devices are particularly compact and lightweight, making them easy to carry for use on site and in different working environments.
VDE testing devices are specially designed for the standard-compliant performance of tests and test sequences.
The ability to calibrate is crucial for ensuring that testing devices provides accurate measurement results.
Modern testing devices can communicate with other devices and computers via interfaces to transfer measurement data and so that they can be controlled remotely.

Where are stationary and mobile testing devices used?

The choice between stationary and mobile testing devices depends on the specific requirements of the application. Stationary devices enable precise and comprehensive analyses in special environments, while mobile devices provide flexibility and speed for on-site inspections.

Stationary testing devices are mainly used in environments where a permanent or specialised test station is required. Typical applications include production facilities where they monitor the quality of products during the manufacturing process. Stationary devices are also used in laboratories and test laboratories: In research and development laboratories, they are used to precisely characterise materials, components, and prototypes. In laboratories specially equipped for testing and certification, they enable comprehensive analyses.

Mobile testing devices are designed for use on site or in changing environments. In field tests, mobile testing devices are used for measurements and inspections on construction sites and in remote areas. Technicians and electricians use mobile testing devices to carry out maintenance work on machines and electrical systems on site. Mobile testing devices enable quick checks and measurements, in particular when installing and repairing electrical systems. In quality control, they enable the efficient inspection of products and systems. In the field of environmental studies and monitoring, mobile testing devices are used to measure environmental parameters on site.

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How often do VDE testing devices have to be calibrated?

Whether and when a VDE testing device should be recalibrated or serviced depends on several factors. For example, field use can overstress and even damage the device. As a rule, the standards do not specify how often a testing device must be calibrated. It is advisable to pay attention to the product-specific information when purchasing. The manufacturer usually suggests a recommended period in which a recalibration of the testing device should be planned.

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