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CISPR-25 semi anechoic chamber

The main purpose of a CISPR-25 semi anechoic chamber is to perform measurements of radiated emission or immunity specialized for vehicle on board equipment testing. The combination of the pan-type 2mm galvanized panel system and the polystyrene hybrid absorbers on the walls and ceiling eliminates unwanted RF reflections and complies with automotive test standards like CISPR-25.

Features of a CISPR-25 semi anechoic chamber:

  • Noise floor level as per CISPR-25 requirements
  • Grounded EUT test table as per CISPR-25 design guide lines
  • Noiseless CDMT lights to meet the stringent requirements of CISPR-25 noise floor level

Applicable standards / test methods for a CISPR-25 semi anechoic chamber:

  • CISPR-25
  • CISPR-12 / EN55012
  • ISO-11451
  • SAE J551

Typical performance of a CISPR-25 anechoic chamber:

  • Absorber return loss of 6dB minimum between 70MHz and 6GHz.

Typical Specifications for a CISPR-25 semi anechoic chamber:

Personnel door
Wall entry panel
EUT power line
Frequency range
Table support
6.45 x 5.55 x 3.675mtr (l*w*h)
2mm ZMA-140 galvanised shielding panels with a structural steel support on the roof panels
Hybrid solution of ferrites tiles and HT25 absorbers on walls and ceiling.
Honeycomb model 1791-3030 (300x300mm / 18GHz)
RF shielded swing door model 1766-1221 (1200x2100mm)
Model 1795-3030 (300x300mm) including RF connectors
Filtered 230VAC / 32A / single phase model 4801-032
CDMT lights 70W model 1840-070
70MHz - 2.5GHz
Reflective metal ground plane
RF-grounding connections to the shield wall or floor for test table cover connection

In addition to the typical specification of the CISPR-25 semi anechoic chamber Comtest can tailor the chamber’s specification to satisfy our customers’ individual requirements.

Options for a CISPR-25 semi anechoic chamber:

  • An additional shielded room can be installed to house high power RF amplifiers (amplifier room)or control and
   test equipment (control room).
  • RF shielded sliding door model 1754-2424 Sa (2400x2400mm) incl. lift platform for full vehicle testing
  • Video and audio monitoring system: color camera unit with remote controller and LCD monitor.
  • EUT test table with connection strips.
  • To test between 70Mhz and 2.5Ghz an absorber solution using MT65 absorbers will be applied.