Sound level calibrator ND9 +/- 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 re-adjusted 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 <3%
- Power supply 9V block battery
- Running time with 1 battery approx. 40 hours
- Weight 170g
- Size 113mm x63mm x44mm
- Supplied with : storage box, adapter for 1/2" microphone capsules and instruction manual.
We offer an adapter for the widely used measurement microphone Beyerdynamik MM1 with a diameter of 9.5mm. We also offer e.g. Audix TM1 adapters and for other microphones.
