Laser Powered Probe – RadiSense® 10

E-Field sensor for radiated immunity EMC testing.

Due to a new patented technology, dramatically improving the isotropic behaviour, the RadiSense 10 is the most accurate electrical field (E-Field) probe in the world! The probe can be used to measure the field strength over a wide frequency band of 9 kHz to 12 GHz. The ongoing endeavour of DARE!! Instruments to develop better products, has now resulted in an unprecedented accurate E-Field probe.

Why is accuracy important?

In order to perform accurate EMC immunity (susceptibility) testing, the absolute electrical field strength has to be determined. This is the case during the actual testing, as well as during verification for substitution testing and the 1-, 4- or 16-point calibrations. Based on these results, the power to be provided by the signal generators and power amplifiers is determined. Hence the accurate measurement of the electrical field is of the utmost importance to perform realistic immunity tests. Therefore, probe manufacturers have made great efforts to improve the accuracy of E-Field probes.

What influences accuracy?

First of all, the size and shape of the probe itself are important factors. The smaller the probe the better. The invention of the laser powered E-field probe by DARE!! Instruments in 1999 was an important step in this respect. Secondly the move to spherical probes instead of square probes improved the accuracy.
Furthermore, amplitude linearity, frequency response, temperature drift and the often forgotten non-isotropic behaviour of the probe, are important parameters.

Superb Isotropy

In the past, the isotropic behaviour of e-field probes was often neglected and left a lot to be desired. The isotropic response is the dependency of the measured field strength in relation to the position of the probe in the electric field. The lower this dependency the better. As during testing in an anechoic chamber, the reflections from the surrounding walls, floor and ceiling, will cause the field(s) to arrive to the probe elements from different angles. This results in large and unpredictable, measurement errors.

Up to now, isotropic behaviour was specified only for the lower frequencies, below 1 GHz, while the isotropic behaviour will cause substantial measurement errors at higher frequencies. Due to the superior design of the RadiSense 10 probe, the isotropic response improved by a factor 5 compared to the competition!
The isotropic behaviour largely contributes to the measurement accuracy. In a typical test environment, this will lead to a major improvement of overall measurement accuracy of more than a factor 2!

How is accuracy achieved?

The RadiSense 10 is a spherical E-Field sensor with six antenna elements. Due to the laser power supply, it has an extreme small measuring volume. By means of patented technology the isotropic response of the probe is dramatically improved. All these factors make the RadiSense 10 probe the most accurate, commercially available, E-Field probe in the world. At the same time its high measurement speed make it suitable for a wide range of electrical field measurements.

High speed & wide band

The RadiSense 10 E-field probe offers a maximum speed of 1,000 isotropic measurements per second. This enables fast E-field measurements under all circumstances.

Due to its unique antenna design, an extremely wide frequency range from 9 kHz to 12 GHz is covered with a single E-field probe. This makes the RadiSense 10 E-field probe ideal for nearly all (EMC) test applications.

With a total of 4 models, the RadiSense 10 provides an optimum solution for different markets as shown in the table below.

Internal calibration data

All frequency and linearity calibration data is stored inside the probe. In addition, the frequency dependent calibration data, obtained from any accredited calibration laboratory, can also be stored inside the probe. Due to the internal calibration data, there is no need to apply frequency dependent corrections for individual axis’. This results in a high accuracy and ease-of-use.