Microtech Gefell Sound Calibrator 4010 Available from AcSoft

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The combination of two sound pressure levels and two frequencies allow both level linearity and frequency linearity to be verified. Each sound calibrator is supplied with an individual calibration certificate.

The reference microphone and control circuit together maintain a constant sound pressure level inside the calibration coupler and automatically adjust for changes in load volume, temperature, atmospheric pressure and relative humidity. In addition the sound calibrator measures the environmental conditions temperature, atmospheric pressure and relative humidity.

Temperature measurement	Range	-10 °C to +50 °C
	Accuracy	±2 °C
	Resolution	0.1 °C
Atmospheric pressure measurement	Range	65 kPa to 108 kPa
	Accuracy	±0.4 kPa
	Resolution	0.1 kPa
Relative humidity measurement	Range	25% to 90%
	Accuracy	±4%
	Resolution	1%
Levels at reference conditions		(94.0 ± 0.2)dB
Levels at reference conditions		(114.0 ± 0.2)dB
frequency at reference conditions		250 Hz (251.19 ± 0.30Hz)
frequency at reference conditions		1000 Hz (1000.00 ± 1.00Hz)
Distortion		max. 2.0%
Stabilizing time		20 seconds
Sensitivity to environmental conditions		as specified for IEC 60942 Class 1
Microphone size	without adapter	(1/1)“
	with adapter 4010-2	(1/2)“
	with adapter 4010-3	(1/4)“
Battery type		2x LR03 alkaline batteries
Battery size		AAA-size acc. ANSI/NEDA
Battery life		>10 hours
Power supply		2 V to 3.4 V
Display	Typ	Mono-colour OLED graphical display
Display	Resolution	128 x 64 (W x H)
LED indicator		two-colour LED
Main value of sound pressure level IEC 60942, 6.3e		114.0 dB
Main value of frequency IEC 60942, 6.3f		250 Hz
Ambient conditions – temperature	operating range	-10 °C to +50 °C
Ambient conditions – humidity, non condensing	operating range	25% to 90%
Ambient conditions – atmospheric pressure	operating range	65 kPa to 108 kPa