The Loop Antenna for magnetic fields was designed to measure medium to high-level field-strengths in the frequency range from 9 kHz to 400 MHz in combination with 50 Ω-Measuring Instruments. The loop is shielded against electrical fields. Thanks to the passive design very high field- strengths can be measured without compression or intermodulation effects caused by the probe.
The HFRAE 5163 is designed to obtain maximum output voltages of 1 V (=120 dBμV) across 50 Ωwhen exposed to the highest limits for radiated immunity tests, e.g. in VG 95373-13 and VG 95373-23. The HFRAE 5163 is also well suited to measure the protection limits according to IEEE C.95.1-1999 and IEEE C.95.1-2005, ICNIRP, FCC 96-236, TKZulV, BImSch, BEMFV, VDE 0848 and many other standards.
The antenna factor is nearly constant around 25 dB/Ωm in the frequency range from 1 MHz to 400 MHz. From 9 kHz to approx. 100 kHz the antenna factor falls with 20 dB/frequency-decade. The application of the HFRAE 5163 is simple: To determine the magnetic fieldstrength in dBμA/m we have to add the value of the magnetic antenna factor kH in dB/Ωm on the voltage reading in dBμV of the measuring instrument as well as the cable attenuation in dB.
