Main Menu

See All Acoustic End-of-Line Test Systems See All DAQ and instruments See All Electroacoustics See All Software See All Transducers See All Vibration Testing Equipment See All Academy See All Resource Center See All Applications See All Industries See All Insights See All Services See All Support See All Our Business See All Our History See All Our Sustainability Commitment See All Global Presence

Main Menu

See All Actuators See All Combustion Engines See All Durability See All eDrive See All Production Testing Sensors See All Transmission & Gearboxes See All Turbo Charger See All Industrial electronics See All S&V Signal conditioner See All DAQ Systems See All Power Analyser See All S&V Hand-held devices See All High Precision and Calibration Systems See All Test Solutions See All nCode - Durability and Fatigue Analysis See All ReliaSoft - Reliability Analysis and Management See All Test Data Management See All DAQ Software See All Drivers & API See All Utility See All Vibration Control See All Acoustic See All Current / voltage See All Displacement See All Load Cells See All Pressure See All Strain Gauges See All Vibration See All Torque See All LDS Shaker Systems See All Vibration Controllers See All Power Amplifiers See All Accessories for Vibration Testing Equipment See All Training Courses See All Acoustics See All Asset & Process Monitoring See All Custom Sensors See All Data Acquisition & Analysis See All Durability & Fatigue See All Electric Power Testing See All NVH See All Reliability See All Smart Sensors See All Vibration See All Weighing See All Automotive & Ground Transportation See All Calibration See All Installation, Maintenance & Repair See All Support Brüel & Kjær See All Release Notes See All Compliance See All Our People

Main Menu

See All QuantumX See All LAN-XI See All SomatXR See All MGCplus See All CANHEAD See All Optical Interrogators See All GenHS See All API See All Microphone Cartridges See All Microphone Sets See All Microphone Pre-amplifiers See All Sound Sources See All Acoustic Calibrators See All Special Microphones See All Accessories for acoustic transducers See All Experimental testing See All Transducer Manufacturing (OEM) See All CCLD (IEPE) accelerometers See All Charge Accelerometers See All Rotating See All Non-rotating (calibration) See All Electroacoustics See All Noise Source Identification See All Environmental Noise See All Sound Power and Sound Pressure See All Noise Certification See All Industrial Process Control See All Structural Health Monitoring See All Electrical Devices Testing See All Electrical Systems Testing See All Grid Testing See All High-Voltage Testing See All Vibration Testing with Electrodynamic Shakers See All Structural Dynamics See All Machine Analysis and Diagnostics See All Dynamic Weighing See All Calibration Services for Transducers See All Calibration Services for Handheld Instruments See All Calibration Services for Instruments & DAQ See All On-Site Calibration See All Resources See All Software License Management

When the earth rocks... vibrating table tests at ZAG

ZAG Ljubljana, Slovenia


The ZAG Ljubljana, Zavod za gradbeni tvo Slovenije, is Slovenia’s national Institute for building and civil engineering, where building products are tested and certified. Building, civil engineering and mechanical engineering structures, their construction elements and assemblies are tested in laboratory and field tests. Together with the earthquake engineering department, the Institute implements tests to evaluate the dynamic and static properties of building structures.


The number of transducers is dependent on the building type

A two-storey terraced house requires:

  • Seven inductive displacement transducers W100 and W50 for measuring the movement of the walls and foundation.
  • Seven accelerometers B12/200
  • Four DD1 strain transducers inside the house to display the first cracks

HBK technology for more than 30 years

The construction laboratory includes a HBK KWS/6 T-5 amplifier and an MBS4 magnetic tape recorder that have been in use for more than 30 years.

The development of the hydraulic control system was accompanied by computer-based data acquisition which meant that the number of measurement points could be increased.

At a later date, more equipment was added, including amplifiers (KWS 6A-5, KWS 3073, KWS 3082A) and transducers (W 200, W100, W 50, W 20, B12/200, D 1).

Vibration tests require extremely high measurement accuracy

All models are tested over several steps with increasing vibrating table movements. The maximum movement in the first step is about 0.6 mm and only the relative movement of the house to the foundation is of interest here.

This is normally a maximum of 0.1 mm. The subtraction of two equivalent values (movement of the roof and movement of the foundation) requires very high measurement accuracy so that accurate results can be obtained.

New technology provides higher quality…

A new data acquisition and control system was used for the first time at the beginning of 2003: two MGCplus system units with 13 amplifier racks ML55B, transducer WA/200 mm, accelerometer B12/200, strain transducer DD1, strain gages, a GP-IB interface and the data acquisition software LabView 6.1, together with a PCI-6052E NI-DAQ unit.

The precise calibration of the WA/200 and the advantages of the MGCplus with its high resolution, filtering and simultaneous sampling means that very precise and reproducible results can be achieved, even with very low strength earthquakes.

…and facilitates test procedures and analysis

The high resolution of the amplifier means that the measurement range from the beginning (0.1mm relative movement) to the end of the test (up to 50mm relative movement) does not need to be changed.

This facilitates test procedures and analysis, and excludes possible sources of error. Work is also simplified by the filter function provided by the MGCplus.

ZAG is the leading Slovenian Institute in the field of building and civil engineering.Through high-quality work it successfully promotes the progress-orientated Slovenian applied science and technical expertise on a global scale. The organization is widely recognized both in Slovenia and in other countries by means of its experts, top-class equipment and multi-disciplinary work, including life cycle analyses of different construction materials.

ZAG is involved in the international co-operation in science and technology with institutions from the EU, the USA and other countries. Over the last 10 years ZAG has participated in more than 50 projects funded by the EU (4th – 7th FP). Its research and testing sector is divided up into four departments: materials, building physics, structures, and geotechnics and infrastructure, it also has its own department for metrology. In the field of tasks deriving from the CPR (the Construction Products Regulation) it has two independent services: the Certification Service and the Service for Technical Assessments.


Its main activities include:

  • fundamental and applied research in the fields of building materials and structures,
  • development of new methods of testing and measurement,
  • certification and attestation of conformity of products, materials and executed works,
  • training of research and technical staff in particular technical fields,
  • participation in the preparation of technical codes and standards.

Technology used

No more result to load

Other case studies