Type 42AE

Type 42AE
The G.R.A.S. Low-Frequency Calibrator Type 42AE 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 two-port configuration allows the actual sound pressure in the coupler to be monitored by a reference microphone simultaneously with the microphone under test.
The built-in DC-coupled power amplifier enables the calibration to be used for swept-sine, broadband and step function investigations.
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