Sound level calibrator ND9B

Sound level calibrator ND9B +/- 1dB This inexpensive sound level calibrator is suitable for simple requirements where an accuracy of +/-1dB is sufficient. This calibrator is priced well below the Center 326, which we have had on offer for many years. This is mainly due to the fact that this calibrator is uncontrolled. This means that only one loudspeaker is installed in the pressure chamber, but no reference microphone. With the Center 326 and all other high-quality calibrators, the sound level in the pressure chamber is measured and readjusted using a reference microphone. This technology is not available on the ND9. Small changes in volume, e.g. if the microphone is not properly plugged in, will change the sound level. The manufacturer advertises the ND9 with IEC642 class 1. This information is not reliable (such devices cost around 1000 euros). Class 2 cannot be achieved either. However, we measure each ND9 with our Bruel&Kjaer 4231 reference calibrator and guarantee an accuracy of +/-1 dB Technical specifications: sound level calibrator Suitable for 1 inch and 1/2 inch microphones Frequency 1kHz+/-2% 94dB and 114dB switchable Deviation +/-1dB Distortion factor