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How often does a digital tachograph have to be calibrated?

In the world of modern transport, efficiency and accuracy are paramount. This is where digital tachographs come into play, revolutionising how we monitor and manage driving hours, rest periods, and overall compliance. However, to ensure that these devices remain reliable and accurate, regular calibration is a must, and that’s where the question arises: how often does a digital tachograph have to be calibrated? 

In this article, we’ll dive into how often a digital tachograph needs to be calibrated to maintain peak performance.

Understanding Digital Tachographs: 

Before we delve into calibration frequencies, let’s quickly recap what a digital tachograph is and how it works. A digital tachograph is a smart device used in commercial vehicles to record driving time, rest periods, and other related data. It replaces the traditional analogue tachographs, offering improved accuracy and efficiency.

The Importance of Calibration: 

Calibration is the process of adjusting and verifying the accuracy of a measuring instrument. Digital tachograph calibration is crucial to ensure the recorded data is consistent and compliant with legal requirements. Accuracy is non-negotiable as these devices are vital in monitoring driver activity and ensuring road safety.

Calibration Frequency:  

The frequency at which a digital tachograph needs to be calibrated can vary based on several factors, including local regulations, the manufacturer’s recommendations, and the type of tachograph being used. In general, however, here are some guidelines to consider:

Initial Calibration: When a new digital tachograph is installed, it usually requires an initial calibration to establish a baseline for accurate measurements. This ensures that the device starts on the right foot.

Periodic Calibration: Regular calibration at specific intervals is essential. For most digital tachographs, calibrating them every two years is standard. This helps prevent any gradual drift in accuracy that might occur over time.

Event-based Calibration:  Certain events might trigger the need for immediate calibration. These events include major repairs, accidents, or any situation that could impact the accuracy of the tachograph.

Selecting a Calibration Service Provider: 

When it comes to calibration, choosing a reputable and certified service provider is crucial. Look for companies that specialise in tachograph calibration and are recognised by relevant authorities. This ensures that the calibration process follows industry standards and provides accurate results.


Digital tachographs are crucial for ensuring compliance and safety. Regular calibration lies at the heart of maintaining accuracy. By adhering to recommended calibration frequencies and partnering with trusted service providers, fleet operators and drivers can enjoy the benefits of reliable data and seamless operations.

For a deeper understanding of digital tachographs, including the meaning behind various pictograms and symbols they display, consider exploring the NTP Online Learning course on “Digital Tachograph and Understanding Pictograms.” This comprehensive resource will empower you with the knowledge needed to navigate the world of tachographs confidently.


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