Electric field uniformity measurements for qualification of Anechoic Chamber at TBRL Chandigarh

Prior to emission and susceptibility testing, the Anechoic chamber is to be qualified and regulatory compliance tests must be performed in accordance with IEC 61000-4-3. This paper discusses about qualification of the Anechoic Chamber and describes the experimental investigations of field uniformity test conducted inside the Anechoic Chamber at TBRL, Chandigarh. A series of investigations have been carried out to determine electric field within the RF frequency band 80 MHz to 1 GHz. Frequency beyond this range was not attempted. Field Strength measurements were taken continuously using calibrated three axis isotropic field measurement probe. Two transmit antennas, one in frequency range 20 MHz - 200 MHz and another in frequency range 200 MHz- 1 GHz were used.