Reliant EMC

Van der Hoofden Test Head

Van der Hoofden Test Head
The "Van der Hoofden“ test head VDHH 9502 allows to determine the exposure of humans to radiation caused by luminaries.
The measurement is based on DIN IEC 62493 (IEC 34/116/CD:2008) and VDE 0848-493. Through different ways of coupling between luminaries and humans a level of exposure of a person to electromagnetic fields can be derived. One part of the exposure is based on capacitive coupling between lighting equipment and person. This induces current densities. These current densities must be measured and evaluated using an EMI receiver and a van der Hoofden test head.

 

Measurement Procedure
The van der Hoofden test head consists of 3 elements: An electrically conductive sphere with a diameter of 210 mm, a connection line of 300 mm length, and a protection network for the EMI receiver. The test head is equipped with a 3/8’’ female thread. It can be mounted on an insulated mast system with height adjustment.
The protection network is housed in the mast fixture clamp. It has to be connected with the test head via the 300 mm cable which is included in the delivery. The cable is equipped with 4 mm banana plugs. The clamp with protection network must be fixed to the mast below the head.
A perfectly suited mast system is the AM 9144 with option “very short”. This allows a height set range of 0.8 - 1.4 m. The lowest required height acc. IEC62493 is 0.8 m. AM 9144 allows to continuously adjust the height up to 1.4 m in telescopic manner. Adding extender pieces of fixed lengths 0.6 and 1.2 m allows to continuously adjust the range from 0.8 to 3.2 m.
The EMI receiver measures a voltage across 50 Ohm. It must be connected to the BNC connector of the mast clamp. To determine the compliance of a luminaire to the standard the measured voltages must be converted into induced current densities. The measured densities must be expressed in relation to the allowed densities and they must be summed up. The result is a factor called F. A DuT is compliant if F does not exceed 0.85. These calculations are readily integrated into the Messbase Software. The measurement can be performed using the following receiver types: FCKL 1528, FMLK 1518, FCLE 1535. If a different type of receiver is used or if the Messbase software is not available the programm “Van der HoofdenTest” can be used to calculate F from the measured voltages. It can be downloaded at the links below.
 
VDHH 9502
Schwarzbeck Van der Hoofden Test Head VDHH 9502 
 

pdficon small Data Sheet VDHH 9502
Program for the calculation of F-factor
Program for the calculation of F-factor (R&S format)

 

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