Application report: Determining the quality of a mobile network for legal proceedings

Today, we are presenting an user report from Thomas Müller. Thomas Müller is a publicly appointed and sworn expert by the Dortmund Chamber of Industry and Commerce, for systems and applications in the field of information processing, as well as organization and project management. He provides expert reports for courts, which should answer to the technical questions of judges and the persons involved in trials. His website contains additional information and you can find it here.

In a lawsuit before a district court, the parties fought over the reliable function of time recording terminals. These should transmit data with time recording bookings (incoming and outgoing) via the mobile network data (GSM) to a central server. The time recording terminals were equipped with a GSM module and have a SIM card, which allowed the access to the mobile network.

The examination of the entire time recording system, necessary to determine the reliability, took place in four locations, each with a time recording terminal. Among other things, an adequate signal strength of the mobile network connection is a prerequisite for the reliable transfer of the time recording bookings of the time recording terminal to the server. Thus, in the examination plan it was included that the signal strength of the mobile network connection (in this case D1) had to be determined at the site of the time recording terminal.

After a market research, the choice for a suitable measuring device fell on the hand-held device TMate Field from the company ENQT GmbH from Hamburg. This device can measure the field strength in dBm. Decibel milliwatt (dBm) refers to the power level in decibels, pertaining to 1 mW. Moreover, the available connection speed is determined and displayed via the speed test. All these details will be displayed for GSM, UTMS and LTE. The values for GSM were sufficient for the facts to be examined here.

Preparation for measurements

The measuring device TMate Field came in a package, with an instruction manual that offered all the necessary information for putting into operation and performing measurements. The measuring device and its accessories came in a practical plastic case, which allowed for a secure transportation between measurement locations. Thanks to the effective user guidance, the familiarization with TMate FIELD only took about half an hour. The touch-sensitive display could be operated without difficulties, with the included plastic stylus. In the case, there also was an antenna adapter, for the connection of an external antenna.

Carrying out measurements

The measurements at the site of the time recording terminals could be carried out without any difficulties in a short amount of time. The meter booted in less than a minute after being turned on, after another 1 to 2 minutes the measurement results could be displayed on the easy-to-read display. In one situation, the connection of an external antenna was necessary, and this was immediately achieved with the adapter available in the case.


TMate FIELD is a simple and easy-to-use tool for the measuring of the signal strength and transfer speed at the sites of the time recording terminals. The data, assessed in the report, could be determined in a secure and problem-free manner. The “attention to detail” was reflected in the availability of the adapter for an external antenna. The TMate FIELD would be used again when it comes to similar tasks.

This application report shows that our mobile communications measuring device, TMate Field, can be easily used for various applications, and thus allows for a fast and simply valid statement regarding the quality of mobile network connections.

Do you also have an application where devices need to be connected via GSM/UMTS or LTE? Just contact us at 040 35 73 20 65 or

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