Multifunction Sound Calibrator GRAS 42AG Class 1

• The GRAS 42AG Multifunction Sound Calibrator is a portable, battery-operated sound source for calibration and check of microphones and sound level meters. It is designed for field use and comes with a protective casing. It conforms to the requirements in IEC 60942 for a class 1 sound calibrator.
• It can produce a sinusoidal signal of 250 Hz or 1 kHz at 94 dB or 114 dB. For documentation purposes, 42AG provides display of the environmental conditions: ambient air pressure, temperature.
• The sound is generated by a small loudspeaker integrated into the acoustic coupler. An internal reference microphone measures the level in the coupler and a feedback circuit automatically adjusts the level. Therefore, the calibration level is virtually independent of ambient conditions like temperature, atmospheric pressure, and humidity within the specified range of operation.
• The calibrator has been designed to serve 1” and smaller microphones and sound level meters equipped with such microphones. 1” microphones fit directly in the calibrator coupler, while 1/2”, 1/4” and 1/8” microphones are served by application of adapters that are part of the delivery.
• The calibrator is powered from two type LR03 alkaline batteries (AAA-size). If the voltage supplied by the batteries is too low to ensure proper operation, the calibrator will automatically switch off or not switch on.

Benefits

• 42AG is designed to fulfill the need for a portable and versatile calibrator for field use. Also, it is designed to be the logical replacement or upgrade from existing calibrators.
• 42AG represents improved functionality and user-friendliness. Its combination of portability, automatic level adjustment, and two calibration frequencies and levels makes it a complete and self-sufficient solution that can be used to perform a complete field-verification without the need for other instrumentation, e.g. for recording ambient calibration conditions.
• With two calibration frequencies, 250 Hz and 1 kHz it is well suited for calibration of microphones that normally are calibrated at 250 Hz as well as sound level meters which normally are calibrated at 1 kHz.
• 42AG can calibrate at two different levels, 94dB, and 114 dB. The 114  dB is a level that suits microphones with medium sensitivity, while the low level of 94 dB makes it possible to calibrate microphones with high sensitivity without overloading the microphone.

Warranty

• The warranty for 42AG is 5 years and covers defective materials and workmanship