Calibration equipment

Calibration equipment

Calibration is an essential step in every precision measurement. It establishes the relationship between the sound pressure and the electrical output of the microphone.

Calibration can be performed at either 250 Hz or at 1 kHz. Both frequencies have their advantages and disadvantages.

250 Hz is in the frequency range where the frequency response of almost all microphones is flat and will therefore give the most accurate calibration.

If, however, the microphone is used in connection with measuring equipment with weighting filters, for example a sound level meter with A-weighting, the 250 Hz signal will be attenuated by the weighting network. In this case it might be advantageous to use a 1 kHz calibration frequency.

At 1 kHz, the weighting filters have 0 dB attenuation and will therefore not affect the calibration.

On the other hand, since the frequency response of the microphone is not flat, a small error could be introduced.

  1. AL0010 Microphone Calibration Stand
    TBD

    G.R.A.S. AL0010 Microphone Calibration Stand

    The G.R.A.S. AL0010 Calibration Stand provides a convenient platform for testing condenser microphones.

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  2. AL0011 Calibration Stand for IEC 60318-1 Ear Simulator

    G.R.A.S. AL0011 Calibration Stand for IEC 60318-1 Ear Simulator

    Provides a convenient platform for calibrating IEC 60318-1 Ear Simulator e.g. G.R.A.S. RA0039.

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  3. 90AB Basic Audiometer Calibration Sys
    Freq range:
    ANSI: S.1.40, S.1.43, S.1.11, S.3.6
    IEC: 60318-1 & -2

    G.R.A.S. 90AB Basic Audiometer Calibration System

    The G.R.A.S. 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.

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  4. 90CA Microphone Calibration System
    Freq range:
    ANSI: S.1.10
    IEC: 60318-1 & -2

    G.R.A.S. 90CA Microphone Calibration System

    The G.R.A.S. 90CA Microphone CalibrationSystem 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.

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  5. 90AA Audiometer Calibration System
    Freq range:
    ANSI: S.1.40, S.1.43, S.1.11, S.3.6
    IEC: 60318-1 & -2

    G.R.A.S. 90AA Audiometer Calibration System

    The G.R.A.S. 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.

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  6. 90CA-S2 Microphone Calibration System, PXI

    G.R.A.S. 90CA-S2 Microphone Calibration System, PXI

    The G.R.A.S. 90CA Microphone CalibrationSystem provides for automated and reliable leveland frequency response calibration of measurement microphones. The implemented calibration methods conform with relevant standards as listed in the specifications.

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  7. 42AP Intelligent Pistonphone
    Sound pressure level: 114 dB
    Freq range: 250 or 251.2 Hz
    ANSI: S1.40
    IEC:60942

    G.R.A.S. 42AP Intelligent Pistonphone, Class 0

    The G.R.A.S. 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.

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  8. 42AC High Pressure Pistonphone
    Sound pressure level: 134 dB
    Freq range: 250 Hz
    ANSI: S1.40
    IEC: 60942

    G.R.A.S. 42AC Pistonphone, high pressure, Class 1

    The G.R.A.S. 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. 

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  9. 42AA Pistonphone
    Sound pressure level: 114 dB
    Freq range: 250 Hz
    IEC: 60942

    G.R.A.S. 42AA Pistonphone, Class 1

    The G.R.A.S. 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.

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  10. 42AB Sound Calibrator
    Sound pressure level: 114 dB
    Freq range: 1 kHZ
    ANSI: S1.40
    IEC: 60942

    G.R.A.S. 42AB Sound Calibrator, Class 1

    The G.R.A.S. 42AB  Sound Calibrator is a small battery-operated 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.

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  11. 42AE Low Frequency Calibrator
    Sound pressure level: 140 dB
    Freq range: < 0.1 to 250 Hz
    ANSI: S1.10
    IEC: 60318-1 & -2

    G.R.A.S. 42AE Low Frequency Calibrator

    The G.R.A.S. 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.

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  12. 51AB Phase Calibrator IEC 61043
    Freq range: 50 Hz to 6.3 kHz
    ANSI: S1.10
    IEC: 60943

    G.R.A.S. 51AB Phase Calibrator according to IEC 61043

    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.

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  13. 14AA Actuator Amplifier
    Freq range: 1 Hz to 200 kHz
    IEC: 61094-6

    G.R.A.S. 14AA Electrostatic Actuator Amplifier

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

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  14. RA0015 1'' Electrostatic Actuator, freq calib
    TBD

    G.R.A.S. RA0015 1'' Electrostatic Actuator for frequency respons calibration

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

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  15. OP0026 Kit for Frequency Calibration of 1/4" Surface Microphones

    G.R.A.S. OP0026 Kit for Frequency Calibration of 1/4" Surface Microphones

    The G.R.A.S. OP0026 kit contains an electrostatic actuator and an actuator calibration holder for G.R.A.S. precision 1/4" surface microphones.

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  16. RA0014 1/2'' Electrostatic Actuator, freq calibration
    TBD

    G.R.A.S. RA0014 1/2'' Electrostatic Actuator for frequency response calibration

    The G.R.A.S. RA0014 1/2'' Electrostatic Actuator for frequency response calibration 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 G.R.A.S. RA0014 can be connected directly to the G.R.A.S. 14AA Actuator Supply .

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  17. OP0024 Kit for Frequency Calibration of Flush-mount Microphone Sets

    G.R.A.S. OP0024 Kit for Frequency Calibration of Flush-mount Microphone Sets

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

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  18. RA0014-S1 1/2'' Electrostatic Actuator, 40AU
    TBD

    G.R.A.S. RA0014-S1 1/2'' Electrostatic Actuator for 40AU

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

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  19. 26AG 1/2'' Insert Voltage Preamp, Connector
    Freq range: 2.5 Hz - 200 kHz
    Noise: 1.8 µV
    Gain: -0.25 dB
    Special feature: For open-circuit sensitivity calibration of 1/2" microphone cartridges

    G.R.A.S. 26AG 1/2'' Insert Voltage Preamplifier with Integrated Connector

    The G.R.A.S. ½-inch Preamplifiers Types 26AG,26AH, 26AJ, 26AK, 26AM and 26TK are smallrobust units optimised for acoustic measurementsusing condenser microphones. They have a verylow inherent noise level, a wide dynamic range anda frequency response from below 2 Hz to above200 kHz.

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  20. 26AN 1/4'' Insert Voltage Preamp
    Freq range: 2.5 Hz - 200 kHz
    Noise: 1.8 µV
    Gain: -0.29 dB
    Special feature: For open-circuit sensitivity calibration of 1/2" and 1/4" microphone cartridges

    G.R.A.S. 26AN 1/4'' Insert Voltage Preamplifier

    The G.R.A.S. 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.G.R.A.S. 26AN is configured to permit use of the insert voltage-technique for determining the open-circuit sensitivity of a microphone.

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