TekBox TBST 200/100/100 – Shielded Tent, 7ft x 3ft x 3ft

TekBox TBST 200/100/100 – Shielded Tent, 7ft x 3ft x 3ft

The TBST-200/100/100 shielded tent is designed to suppress interference from ambient noise when carrying out EMC pre-compliance measurements. The TBST200/100/100 has an external size of 7ft x 3ft x 3ft. The tent can accommodate any Tekbox pre-compliance test equipment such as LISNs or TEM-cells. The shielded tent is composed of two layers of conductive fabrics. It is supported by rigid aluminum profiles. The filter panel at the side provides a 240V/10A mains AC filter, two general purpose 240V/10A AC/DC filters and four coaxial feed through adapters with screw caps. The access opening is sealed with conductive Velcro tape.

Example: Conducted Noise Measurement

The dark green graph below shows the measured spectrum of a non-powered DUT in a CISPR 25 conducted noise measurement setup. The DUT connects to the TBOH01 5μH LISN with a very short supply cable (4″). The cable between LISN and DUT and the DUT PCB itself already pick up significant ambient noise from AM and FM broadcast stations. The light green line shows the results of the same arrangement, with the DUT and LISN placed inside the shielded tent.

The graphs below show the conducted noise spectrum of the powered DUT. In the unshielded set up, all emissions, except the first harmonic of the DUT and conducted noise between 40 MHz and 50 MHz, are hidden under the ambient noise level. An accurate measurement would not be possible without a shielded set up.