Laboratory Magnetometers – VEMA Vector Magnetic Analyzers
The VEMA laboratory magnetometer is a vector magnetometer of our own design, working on the patented physical principle. The VEMA magnetometer is the direct successor of the first digital magnetometer in Czechoslovakia and represents its fourth generation. It is used for the measurements and analysis of the DC and extremely low-frequency weak magnetic fields. It is mainly used for the material research, measurement of the dispersion fields of the electrical machines, devices and distribution systems, in biomedicine and in biology.
Other areas of application are the investigation of the geomagnetic fields and of their local anomalies, measurement and investigation of the objects’ magnetic fields, magnetometric diagnostics, object security, precise navigation etc.
The magnetometer is characterized by the separately decomposable vector probes, which allow the user to measure the gradients, to measure in the Cartesian or other user-defined coordinate system, and to measure simultaneously in the several points in the space.
The VEMA magnetometer includes software for the visualization, analysis and recording of the measured magnetic fields. The analytical tools enable the frequency analysis using the Fourier transform, correlation analysis and the visualization of the position of the magnetic field vector in the space.
Technical specifications
| No. | Technical parameter / function | Value |
|---|---|---|
| 1. | Four simultaneously working channels | 4 ch |
| 2. | Resolution | Better than 1.10–9 T |
| 3. | Measurement frequency range | min. 250 Hz |
| 4. | Direct range without the sensitivity switching (dynamics) | 100 µT, (100 dB) |
| 5. | Linearity | Better than 0.5 % FS |
| 6. | Working temperature range with guaranteed parameters | 10 – 30°C |
| 7. | Vector measurement | Yes |
| 8. | Power supply | 12 V DC |
| 9. | Computer connection | USB |
| 10. | Separately deployable probes – the possibility of measurements at arbitrarily defined points and by orienting the probe in them | YES |
| 11. | Possibility of gradient measurement in two components | YES |
| 12. | Possibility of second-order gradient measurement | YES |
| 13. | Possibility of vector measurements in the Cartesian system and in one arbitrary direction (or gradient in one selected axis) | YES |
| 14. | The possibility of operation in the environment with strong electromagnetic interference (up to tens of µT units) | YES |
| 15. | SW equipment for the data transmission and processing suitable for the dynamics of the measurement of 100 dB and the sampling frequency from 500 to 1000 Hz in four simultaneous channels | YES |
| 16. | SW for recording of the measurement results in the files with the parameters of time and channel number, space or time and space simultaneously. View of the data in files or oscilloscope display | YES |
| 17. | File format compatible with the SW for the processing, analysis (such as calculation of total magnetic field, differences, dispersions, or correlations) and display of the measurement results, for example using the QtiPlot SW | YES |
| 18. | Probes with 5 m cable | 4 pcs |
| 19. | Cable for the connection of the magnetometer to the computer | 1 pc |