A Lightweight and Compact Acoustic Calibrator

The NC-74, similar to the NC-75, is a class 1 calibrator suitable for calibration of high-precision sound level meters.

• Detects atmospheric pressure and adjusts signal accordingly to always output a constant sound pressure level
• Accepts 1 inch and 1/2 inch diameter microphones (with 1/2 inch microphone adapter)
• Nominal sound pressure level: 94dB
• Nominal frequency: 1kHz

Applicable Standards

• IEC 60942 Class 1
• JIS C1515 Class 1