Compact and lightweight unit requires no atmospheric pressure compensation
- Compliant with IEC 60942:2003 class 1 and JIS C1515:2004 class 1
- Allows calibration of 1-inch and 1/2-inch microphones
- No need for atmospheric pressure compensation
- Frequency 1 kHz, SPL 94dB
Carefully insert the microphone all the way into the coupler of the NC-74. Then simply turn the power on to apply a constant sound pressure level to the diaphragm of the microphone.
The performance of the NC-74 is suitable for calibration of high-precision sound level meters.
The unit is compact, lightweight, and easy to use. Two IEC LR6 (size AA) alkaline batteries will power the unit for more than 30 hours of continuous use at room temperature.
|Applicable standards||IEC 60942:2003 class 1
JIS C1515:2004 class 1
|Suitable microphones||1-inch microphones||IEC 61094-1 Type LS1P|
|1/2-inch microphones||IEC 61094-1 Type LS2aP|
|Nominal sound pressure level||94 dB|
|Sound pressure level tolerance||±0.3 dB|
|Nominal frequency||1 kHz|
|Frequency tolerance||±1.0 % or less|
|Power requirements||IEC LR6 (size AA) alkaline battery × 2|
|Dimensions, mass||Approx. 49 (H) × 80 (W) × 74 (D) mm
Approx. 200 g (including batteries)
|Supplied accessories||Case × 1
IEC LR6 (size AA) alkaline battery × 2
1/2-inch microphone adapter NC74S10 × 1