Reference Calibrators

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Reference Calibrators

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

gras 42aa

Sound pressure level: 114 dB
Frequency: 250 Hz
IEC: 60942

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.

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

42ap_web

Sound pressure level: 114 dB
Frequency: 250 or 251.2 Hz
ANSI: S1.40
IEC:60942

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.

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

42ac_web

Sound pressure level: 134 dB
Frequency: 250 Hz
ANSI: S1.40
IEC: 60942

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.

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

42ab_web

Sound pressure level: 114 dB
Frequency: 1 kHz
ANSI: S1.40
IEC: 60942

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.

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

42ae_web

Sound pressure level: 140 dB
Freq range: < 0.1 to 250 Hz
ANSI: S1.10
IEC: 60318-1 & -2

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.

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

51ab_web

Freq range: 50 Hz to 6.3 kHz
ANSI: S1.10
IEC: 60943

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