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
- IEC 60942 Class 1
- JIS C1515 Class 1