According to EN 55015 / 4.4, the magnetic field strength of fluorescent lighting luminaires has to be measured if the operating frequency is above 100 Hz. The measurement is done with a triple loop antenna as shown above. The Unit Under Test is positioned under operating conditions in the center of the triple loop antenna. To measure the magnetic field strength without turning, there are loops in X-,Y- and Z-direction. A current transformer converts the loop current into an appropriate voltage. Ferrite chokes reduce braid current on the coaxial cables which would cause the wrong measurement.

The switch box gives access to one of the three loops via local or remote control. The r. f.-output is connected to the input of an interference measuring receiver. The calibration balun HFCD 9171 substitutes the E.u.T. during calibration. A signal generator may be used as a source for the balun. An ideal instrument for measurement and calibration is the Schwarzbeck interference measuring receiver FCKL 1528 with the optional tracking generator, which is also the best choice for measuring the insertion loss of luminaires.

Technical Data

Triple Loop Antenna HXYZ 9170

Principle: Three loops with current transformers acc. to EN 55015

Loop diameter: 2 m

Loop Material: PVC-plastic

Construction: The three loops are clamped to each other mechanically with plastic clamps on the crossing points. The loops are fixed to a massive ground plate via rectangular glass fiber tubes. Additional struts for best stability and ruggedness.

Height: Max. 2,55 m

Width: Max. 2,10 m

Current transformer: Precision toroid transformer, frequency range 9 kHz-100 MHz in a metal box with BNC-conn.. Ferrite absorbers in 3 coaxial cables.

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: 3 loops with current transformers and fixing clamps

Stand: HXYZ 9170 Sockel Glass fiber tubes, struts, ground plate.

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

Calibration dipole (balun): HFCD 9171, CDA 9271

Options: 

HXYZ 9170 RS USER Adapter - The HXYZ 9170 - RS adapter is used to connect the switchbox HXYZ 9170 to R&S devices with a 25-pin user interface (e.g. ESPI, ZVR, ESCI, ESCS, FSB).

HXYZ 9170 RS AUX Adapter - The HXYZ 9170 – RS AUX adapter is used to connect the switchbox HXYZ 9170 to R&S devices with a 9-pin AUX interface (e.g. ESL and ESR).