BNNEMR

BNN Offers calibration and measurements of shielding rooms, semi anechoic chambers, fully anechoic rooms and other test sites used for EMC measurements between 9 KHz to 40 GHz.

The onsite testing/measurement of Shielding Effectiveness is carried out as per following scope:-

• IEEE 299: 2006.
• Enclosures and boxes having all dimensions between 0.75m to 2m as per IEEE 299.1: 2013.
• Appendix A of MIL Std. 188-125.2: 3 Mar 1999.

EMI test sites for radiated emission measurements in the 1 GHz to 18 GHz Require site validation by measurement of site voltage standing wave ratio (SVSWR), which is the ratio of the maximum received signal to the minimum received signal caused by interference between direct (intended) and reflected signals. There are two different approaches for showing compliance with the acceptance criterion:

• The SVSWR method in line with CISPR 16-1-4. This requires special antennae described in the standard
• The new time domain SVSWR (TD SVSWR) method in line with the ANSI C63.25 (Draft stage)

The NSA measurements (30MHz to 1GHz) are carried out to determine suitability of a Semi Anechoic Chamber or an Open Area Test Site for undertaking the Radiated Emissions test as per CISPR 16-1-4.

The Field Uniformity measurements as per IEC 61000-4-3 (80MHz-18GHz) are used to validate test sites for radiated immunity measurements and are also required to generate necessary calibration files used during subsequent testing.

BNN has a 17025 calibrated EMF probe upto 18GHz to undertake these measurements..

The Modelled Long wire (Long Wire) measurement confirms the conductivity and grounding of a mettalic test table used in automotive EMC measurements within an ALSE. The enclosure is lined with ferrite and other radio freqeuency absorbing methods.

Testing is undertaken using a special Long wire antenna along with Bi-conical and Log Periodic antennae