校准设备

The GRAS 42AE Low-Frequency Calibrator permits microphone calibration at frequencies down to 0.01 Hz for both front and rear-vented microphones. It produces a constant sound pressure level down to very low frequencies.

The GRAS 26AG is a small robust preamplifier with insert voltage calibration facility. It has a very low inherent noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz.

The GRAS 26AN 1/4" Preamplifier is a small robust unit optimised for acoustic measurements using condenser microphones. It has a very low inherent noise level, a wide dynamic range and a frequency response from below 2 Hz to above 200 kHz.GRAS 26AN is configured to permit use of the insert voltage-technique for determining the open-circuit sensitivity of a microphone.

The GRAS Pistonphone 42AA is a battery-operated, precision sound source for accurate and reliable calibration of measurement microphones, sound level meters, and other sound measuring equipment.

The GRAS 42AC Pistonphone, high pressure is a precision sound source for calibrating microphones. It is battery operated and produces a constant sound pressure level of 134 dB re. 20µPa (equivalent to 100 Pa) at 250 Hz, or 125.4 dBA re. 20µPa. 

The GRAS 42AP Pistonphone is a battery-operated, precision sound source for accurate and reliable calibration of measurement microphones, sound level meters and other sound measuring equipment.

The 51AC Sound Intensity Calibration Kit is a ready to use kit for sensitivity and phase calibration of GRAS Rugged Intensity Probes (50AI-LP, 50GI-P, 50GI-RP). The kit consists of a calibration adapter with two calibration chambers, a GRAS 42AA Pistonphone, Class 1, and a GRAS ZC0002K Barometer.

The GRAS 90AA Audiometer Calibration System is easy and fast to set up and control and can be upgraded as your calibration needs change. From quick measuring of frequencies and test signal levels to harmonic distortion and representation of the values in one table together with the third octave band spectrum.

The GRAS Audiometer Calibration Systems are configured to meet the requirements of modern audiometer calibration. They are easy and fast to set up and control, and can be upgraded as your calibration needs change.

The GRAS 90CA-S2 Microphone Calibration System provides for automated and reliable level and frequency response calibration of measurement microphones. The implemented calibration methods conform with relevant standards as listed in the specifications.

GRAS 42AG 多功能声音校准器是一种便携式、电池供电的精密传声器校准器。校准器可以直接用于 1 英寸传声器。包括用于校准 1/2 英寸（工厂安装）、1/4 英寸和 1/8  英寸传声器的适配器。

The Sound-intensity Calibrator 51AB is a coupler for phase and level calibrations of sound-intensity microphone pairs. It can be used for residual intensity testing, sound-intensity level calibration and particle velocity calibration as specified in IEC standard 1043 Electroacoustics-Instruments for the measurements of sound intensity- Measurement with pairs of pressure sensing microphones.

The GRAS OP0024 kit contains a calibration holder, electrostatic actuator and actuator calibration adapters for 1/8" and 1/4" size of  GRAS Flush-mount Microphone Sets. For 1/2" size no adapter is used.

The GRAS OP0026 kit contains an electrostatic actuator and an actuator calibration holder for GRAS precision 1/4" surface microphones.

The GRAS RA0014 1/2'' Electrostatic Actuator is an electrostatic actuator for testing the frequency response of standard 1/2”, 1/4” and 1/8" microphones; adapters are included for testing 1/4” and 1/8"microphones. The GRAS RA0014 can be connected directly to the GRAS 14AA Actuator Supply .

The GRAS RA0014-S1 1/2'' Electrostatic Actuator is for testing the frequency response of the microphone 40AU-1. The GRAS RA0014-S1 can be connected directly to the GRAS 14AA Actuator Supply .

The GRAS RA0015 is an electrostatic actuator for testing the frequency response of standard 1” microphones. The RA0015 can be connected directly to the GRAS 14AA Actuator Supply.

The GRAS 14AA Electrostatic Actuator Amplifier is a high-gain, high-voltage amplifier. The 14AA together with the available GRAS electrostatic actuators RA0014 and RA0015 comply with IEC 61094 -6 “Measurement microphones - Part 6: Electrostatic actuators for determination of frequency responses.”

RA4800 is a field verification adapter for UTP, surface-mount, and flush-mount microphones. With this adapter, it is possible to perform quick and reliable verification without having to dismount the microphone.