校准设备

GRAS 42AE 低频校准器可对前泄压和后泄压传声器进行低至 0.01 Hz 的频率校准。它能在极低频率下产生恒定的声压级。

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.

GRAS 42AA 活塞发声器是一款电池供电的精密声源，用于对测量传声器、声级计及其他声音测量设备进行精确、可靠的校准。

GRAS 42AC 高压活塞发声器是一款用于校准传声器的精密声源。它由电池供电，可在 250 Hz 下产生 134 dB re. 20µPa（相当于 100 Pa）的恒定声压级，或 125.4 dBA re. 20µPa。

GRAS 42AP 活塞发声器是一款电池供电的精密声源，用于对测量传声器、声级计及其他声音测量设备进行精确、可靠的校准。

51AC 声强校准套件是一款即用型套件，用于对 GRAS 坚固耐用的声强探头 (50AI-LP, 50GI-P, 50GI-RP) 进行灵敏度和相位校准。该套件包含一个带两个校准腔的校准适配器、一台 GRAS 42AA 1级活塞发声器以及一个 GRAS ZC0002K 气压计。

GRAS 90AA 测听仪校准系统设置和控制简单快捷，并可根据您校准需求的变化进行升级。其功能涵盖从快速测量频率和测试信号电平，到谐波失真，乃至将数值与 1/3 倍频程谱一同呈现在同一个表格中。

GRAS 测听仪校准系统经过配置，可满足现代测听仪校准的要求。它们设置和控制简单快捷，并可根据您校准需求的变化进行升级。

GRAS 90CA-S2 传声器校准系统可对测量传声器进行自动、可靠的电平和频率响应校准。其采用的校准方法符合规格中所列的相关标准。

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.