GRAS 42AB Sound Calibrator, Class 1

Transcription

1 GRAS 42AB Sound Calibrator, Class 1 Sound pressure level: 114 db Frequency: 1 khz ANSI: S1.40 IEC: The GRAS 42AB Sound Calibrator is a small batteryoperated precision microphone calibrator. The calibrator can be used directly on 1" microphones. Adapters for calibrating 1/2" (factory mounted), 1/4" and 1/8" microphones are included. GRAS Sound & Vibration A/S Skovlytoften 33, 2840 Holte, Denmark

2 Technology Page: 2 As of July 2017, the 42AB Sound Calibrator is replaced with the 42AG Multifunction Sound Calibrator, and the 42AB will therefore no longer be available for normal purchase. However, if you have specific needs that call for a 42AB - for example for reasons of standardization or as supplement to one or more 42ABs already in your possession - 42AB will be available on request. In this case you should contact GRAS when ordering. We still provide service for 42AB. from the calibration chamber. The output level of the 42AB, viz. 114 db (re.20 μpa) at 1 khz, meets the requirements of IEC Standard ( ) Class 1 and is therefore in accordance with international standards. It complies with ANSI S1.40 (1997). The GRAS 42AB is supplied with a leather protection case and an individual calibration certificate. Typical applications and use Microphone calibration Microphone comparisons Design The GRAS 42AB works at the reference frequency (1 khz) of the internationally standardized weighting filters A, B, C, and D. This means that it can be used directly for calibrating sound level meters and other similar equipment with these weighting filters activated without having to make corrections. The calibration level is 114 db (re. 20 μpa) which corresponds to 10 Pa. This is enough to ensure immunity to background noise without overloading the equipment. The 42AB consists of a sound source, a reference microphone, and an electronic control circuit. The special reference microphone is extremely stable and independent of variations in barometric pressure, temperature, and humidity. The reference microphone and control circuit together maintain a constant sound pressure level inside the calibration chamber and automatically adjust for changes in load volume, temperature, humidity, and barometric pressure. Additionally, the calibrator will automatically switch off when the microphone under test is removed

3 Specifications Page: 3 Frequency Hz 1000 (± 0.2 %) Sound pressure level db 114 (± 0.2 db) ANSI standard S1.40 IEC standard Temperature range, operation C / F -10 to 50 / 14 to 122 Battery type 9V 6LR61 Weight g / oz 220 / 7.76

4 Ordering Info Page: 4 Included GRAS RA0297 GRAS RA0049 GRAS RA0069 GRAS EL0003 Adapter (factory mounted) for calibrating 1/2" microphones. Remove this for calibrating 1" microphones. Adapter for 1/4" microphones Adapter for 1/8"" microphones 9 V alkaline battery GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

5 GRAS Worldwide Subsidiaries and distributors in more than 40 countries GRAS SOUND & VIBRATION A/S GRAS SOUND & VIBRATION USA GRAS SOUND & VIBRATION UK GRAS SOUND & VIBRATION CHINA LTD. Skovlytoften Holte Denmark Tel: East Enterprise Parkway Twinsburg, OH United States Tel: Building 115 Bedford Technology Park Thurleigh, MK44 2YA Bedford United Kingdom Tel: Rm 1606, Kodak House ll No. 39 Healthy Street East North Point Hong Kong China Tel: About GRAS Sound & Vibration GRAS is a worldwide leader in the sound and vibration industry. We develop and manufacture state-of-the-art measurement microphones to industries where acoustic measuring accuracy and repeatability is of utmost importance in R&D, QA and production. This includes applications and solutions for customers within the fields of aerospace, automotive, audiology, and consumer electronics. GRAS microphones are designed to live up to the high quality, durability and accuracy that our customers have come to expect and trust.