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Type 4229 - Hycrophone Calibrator - Unboxed

Type 4229 - Hycrophone Calibrator - Unboxed

Type 4229

ハイドロフォンキャリブレーター

ハイドロフォン

4229型ハイドロフォンキャリブレーターは精密で高品質な音圧源です。ハイドロフォンを空気中で使用することで、音響測定システムの校正を簡単に行うことができます。

Type 4229

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4229型ハイドロフォンキャリブレーターは、8100、8101、8103、8105型のHBKハイドロフォンを校正するために設計されています。
このハイドロフォンキャリブレーターは、HBKハイドロフォンを使用する音響測定システムを、空気中で迅速かつ簡単に校正する方法を提供します。
必要であれば、1/2インチマイクロホンでカプラ内で発生する音圧レベルをモニターし、0.3 dB以内の校正精度を得ることができます。ハイドロフォンのキャリブレーターはコンパクトで、バッテリー駆動のため、現場でも実験室でも使用できます。

8106型ハイドロフォンの校正（特にカプラーWA-0658が必要）
フィールド校正

Hydrophone Calibrator - Type 4229

Data Sheets

English

Product Code	説明
UA-0546-A--	4229 Coupler for 8101/05
UA-0548-A--	4229 Coupler for 8103
UZ-0004---	Measuring instrument, barometer to measu

Using a dummy hydrophone, the microphone itself can be calibrated. All Brüel & Kjær Hydrophone Calibrators undergo individual factory calibration making them traceable to NIST.

The hydrophone calibrator works like a pistonphone. A sound pressure is produced in the coupler cavity by oscillating pistons. This arrangement is an original Brüel & Kjær design, and consists of four pistons mounted symmetrically around a cam disc. Rotating the cam disc moves the pistons in and out of the coupler cavity in phase.

The design reduces the effect of cam disc eccentricity and harmonic distortion and ensures maximum sound pressure level stability.

The tone, of 251.2Hz, is electronically controlled for ±0.1%.
At this frequency, the sensitivity of Brüel & Kjær Hydrophones in air and in water is almost identical, so they can be calibrated in air without any significant loss of accuracy.

The sound pressure levels produced in the coupler volumes are typically 156.5, 166, 162 and 151.5 re 1 mPa for Hydrophones Types 8101, 8103, 8100/04 and 8105 respectively. Accurate values for these levels are given on the calibration chart supplied with each calibrator.

Three couplers are provided for calibrating Brüel & Kjær Hydrophones. A coupler (WA-0658, typical sound pressure level 152 dB) for calibrating Hydrophone Type 8106 is available as an accessory. Such high levels mean that hydrophones can be calibrated even in very noisy areas.

The calibration is done by using the dummy hydrophone (DO-0077) and coupler UA-0548. When calibrated, this microphone can be used to monitor the actual sound pressure level inside any coupler volume during hydrophone calibrations.

By comparing the sound pressure levels measured by the microphone and the hydrophone, a more accurate hydrophone calibration can be made. Variations in atmospheric pressure in the range 650 hPa to 1080 hPa can be corrected for, in dB, using the barometer supplied.

The hydrophone calibrator can operate in the temperature range –10°C to +50°C (14°F to122°F) without significant loss of accuracy.

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