Nor1294 Phase Verification Coupler

The Nor1294 Phase Verification Coupler is a precision acoustic device for verifying the phase and amplitude match between the two microphones in a sound intensity measurement probe. Compliant with IEC 61043 requirements, the Nor1294 ensures that the microphone pair used for sound intensity measurements maintains the tight phase matching necessary for accurate intensity calculations across the full measurement frequency range. Sound intensity measurement relies on measuring the pressure gradient between two closely spaced microphones. Even small phase mismatches between the microphones can introduce significant errors in the calculated intensity, particularly at low frequencies where the pressure difference is inherently small. The Nor1294 provides a controlled acoustic environment where both microphones are exposed to identical sound pressure, allowing the measurement system to quantify and compensate for any residual phase difference. Designed to work with the Nor1290 sound intensity probe kit and the Nor150 dual-channel analyser, the Nor1294 is an essential quality assurance tool for any laboratory or consultancy performing sound intensity measurements per ISO 9614. Phase verification should be performed before each measurement session and whenever probe components are changed. For research laboratories, automotive testing facilities, and industrial noise control consultants across the GCC, the Nor1294 provides the confidence that their sound intensity measurements meet the accuracy requirements specified in international standards.