Accessories

The RA0020 is specially designed and optimized for use with 1/2" microphones for sound pressure measurements, when high speed wind comes from one known direction e.g. in a wind tunnel...

RA0020-A is a nosecone for 1/2" microphones. It is similar to RA0020 but made of aluminium for lightness...

The RA0022 is specially designed and optimized for use with 1/4" microphones for sound pressure measurements, when high speed wind comes from one known direction e.g. in a wind tunnel...

Coupler for 1” microphones. For use with GRAS pistonphones...

Two-port coupler for 1/2” microphones. Used in comparison calibrations between two 1/2” microphones; one of which is a reference microphone. It can also be used in measuring the P-I (Pressure-Intensity) Index of intensity probes at 250 Hz. For use with GRAS 42AA & 42AP Pistonpho..

The RA0041 is an adapter for calibrating the GRAS 41CN Outdoor Microphone System . It fits over the rain protection cap of the 41CN and permits in-situ calibration using a Pistonphone such as the 42AA or a Calibrator such as the 42AB...

Two-port high-pressure coupler for 1/2” microphones. Used in comparison calibrations between two 1/2” microphones; one of which is a reference microphone. It can also be used in measuring the P-I (Pressure-Intensity) Index of intensity probes at 250 Hz. For use with GRAS 42AC Pistonphone...

Pistonphone coupler which is factory mounted on GRAS Pistonphone and they are factory calibrated as one unit...

Adapter for GRAS  1/4" and 7 mm microphones when calibrating using GRAS Pistonphones and Sound Calibrator...

For use with GRAS couplers and artificial ears. It has an adjustable spring-loaded arm to exert a variable force on the test object...

Dimension adapter which increases the diameter of a 1/2" microphone to 1". The adapter is relevant for use with GRAS 45CA Hearing-protector test fixture or in other situations where a 1/2" microphone is to be mounted in a 1" inner diameter hole/cylinder...

The RA0062 is a 20 pF input adapter for 1/2" preamplifiers. One end screws on to a 1/2" preamplifier and the other end has a BNC input connector. This enables connecting a signal generator to the input of the preamplifier. Short circuiting the BNC input results only in loading the preampli..

The RA0062-S1 is a 50 pF input adapter for 1/2" preamplifiers. One end screws on to a 1/2" preamplifier and the other end has a BNC input connector. This enables connecting a signal generator to the input of the preamplifier. Short circuiting the BNC input results only in loading the pream..

The RA0063 is an adapter for using a 1/8" microphone with a 1/4" preamplifier. It can be used with any standard 1/8" microphone and 1/4" preamplifier such as the GRAS 26AC...

The GRAS RA0067 enables a prepolarized 1/2" microphone (typically a GRAS 40AD) to be used as a high-impedance sound source...

1/2" Adapter for 1/8" microphones when calibrating using GRAS pistonphones and Sound Calibrator...

Test base for GRAS artificial ears and couplers...

Octopus couplers for calibrating up to eight 1/2" microphones simultaneously...

The RA0073 is an adapter for using a 1˝ microphone with a ½˝ preamplifier. The influence of the RA0073 on the acoustic field is minimal...

The GRAS RA0077 adapts a 1/2” microphone (remove grid) into a 1" microphone (without grid). Designed for NBS 9A / IEC 60313 Coupler GRAS RA0075 and Artificial Ear with NBS Coupler GRAS 43AF...

The RA0080 is a 6pF input adapter for 1/4" preamplifiers. One end screws on to a 1/4" preamplifier and the other end has a Microdot input connector. This enables connecting a signal generator to the input of the preamplifier. Short circuiting the Microdot input results only in loading the ..

Pliers for firm but gentle gripping of a 1/2” microphone when unscrewing its protection grid or unscrewing the microphone from a preamplifier...

The GRAS RA0082 is an adapter for using a 1/8" microphone with a 1/4" preamplifier...

For utilising the signal and signal-ground pins only of the 7-pin LEMO input of a preamplifier power supply.  ..