JB24T — 24-Channel BNC Junction Box / Patch Panel

JB24T is a 24-channel BNC junction box — a patch panel for accelerometer and microphone arrays. Channels are numbered 3 rows of of 8 and marked beside every connector, so the map between sensor, panel and analyser channel stays readable while a test is being dressed.

Electrical performance

Flatness is the specification that defines this product: ±0.1 dB from 10 Hz to 20 kHz, the band that vibration and acoustic measurement actually occupies. Contact resistance is ≤ 5 mΩ and insulation resistance ≥ 1000 MΩ.

Total harmonic distortion and noise floor are also measured and reported, and it is worth being precise about what those figures mean. A junction box is a passive assembly of connectors and coaxial cable with no active device in it, so a THD or noise-floor measurement characterises the test system at least as much as the box. The result is a null one — the assembly adds no distortion or noise above the analyser’s own floor — and that is what the delivered test report demonstrates.

Test report

Every unit ships with a test report generated on a calibrated analyser, covering THD, noise floor and frequency response in both dBV and percent, across a minimum of 10% of connectors or eight channels, whichever is higher, with worst-case values reported.

Configuration

Cover type, mounting, gland count and size, connector make, panel marking and test-report scope are all configurable. Connectors are supplied from an approved list — Amphenol, Neutrik, TE Connectivity or Fairview Microwave — with the make and part number stated in the offer and in the as-built documentation. See the full family comparison for how the configurations differ across channel counts.

Supply and support

Designed and built by TIERA in Thiruvananthapuram. 12-month warranty; AMC available. Pricing and lead time on request.