Large Loop Antenna System according to CISPR 16-1-4 with 3 independent orthogonal loops with 3 m diameter and coaxial switching unit to measure the magnetic field strength. The loop antennas are mounted on a non-conductive support stand, equipped with a coaxial switch to select one of three loops. Ferrite braid chokes are supplied with the loop antenna system to suppress unwanted sheath currents, which exceed the CISPR 16-1-4 requirements by far. Self resonances of the large loops are suppressed by two resistive antenna slits per loop. The coaxial switch allows both, manual switching and remote switching by the EMI-receiver and software. The loop antenna system is intended for the use of inside buildings.

Application:

The three-axis loop antenna system measures the current induced in the loop caused by radiated magnetic fields. A typical application is the measurement of radiated disturbances of lighting equipment according to EN 55015 / CISPR 15 in the frequency range from 9 kHz to 30 MHz. The EuT is placed in the middle of the loop antenna system, with a minimum separation of 0.3 m. The cables of the EuT should leave the loop antenna system through one octant with a minimum separation of 0.4 m to any ring of the antenna. The voltage readings of the receiver in dBμV must be reduced by the relative sensitivity of the 3 m loop antenna to obtain the induced currents, referred to the 2 m loop antenna. Further details are described in CISPR 16-1-4 and CISPR 15.

Technical Data

Frequency range:         9 kHz - 30 MHz

Loop diameter:             3 m 

Circumference of a loop:  9.43 m 

Cladding tube diameter:   25 mm 

Validation factor:           79...100 dBΩ 

Minimum spacing EuT-ring:  0.3 m 

Maximum EuT size:     2.4 x 2.4 x 2.4 m 

current transformer conversion ratio:  1:1 (0 dB) Nominal

Transfer impedance of the current transformers:   1.2 Ω +/- 0.2 Ω

Inductance per unit length:      0.92 μH/m

Height of the horizontal loop:  ≈ 2.05 m

Coaxial cable with a double-braided shield:  RG 223/U

BNC Coaxial connector type:

Series Resistance of the ferrite absorbers:   > 300 Ω @ 10 MHz

Dimensions:   3.2 x 3.2 x 3.6 m

Weight:    67 kg

Calibration-Dipole (Balun) HFCD 9171

Principle: Coaxial constant current loop for calibration of the HXYZ 9170 acc. to EN 55015/B.4.

Construction: Coaxial cable fixed to a plastic plate. Metal box with BNC-conn.. Switchbox

Principle: R.f.-switch to select 1 of 3 loops

Control: Manually via a rotary switch, remote control via a 9-pin sub-d-connector 4 LEDs to monitor the state.

Attenuation of selected path:<0,5dB 9k-30MHz

Leakage from other paths: >45 dB 9 k-30 MHz

Construction: Metal box with 4 BNC-connectors and remote control connector. 4 LEDs. The box can be mounted on the glass fiber tube.

Ordering information

Basic set HXYZ 9170 3m: 3 loops with current transformers and fixing clamps

Stand: Included

Switchbox: HXYZ 9170 Umschaltbox Selector manual and remote control, 3 coaxial cables with ferrite chokes.

Calibration dipole (balun): HFCD 9171, CDA 9271