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Calibration Signal Parameters:
Sound Pressure Level (SPL): 114 dB or 94 dB
IEC 60942 Accuracy: Class 1
SPL Tolerance: ±0.25 dB
Frequency Tolerance: ±0.2 %
Total Harmonic Distortion (THD): < 0.75 % for 94 dB; < 1.00 % for 114 dB
General Information:
Effective Load Volume Sensitivity: 0.00027 dB/mm³
Level Stabilisation Time: typically 10 s; max 25 s
Calibration Microphones: 1/2” and 1/4”
(with SA 30 adapter)
Storage Temperature Range: -25 °C to +70 °C
CE Classification: EN 61010-1:2010; EN 61326-1:2013; IEC 60942:2017
Working Conditions:
Temperature Range: from -10 °C to +50 °C
(relative SPL error ±0.15 dB from 65 kPa to 108 kPa)
Atmospheric Pressure Range: from 65 kPa to 108 kPa
(relative SPL error ±0.10 dB)
Humidity Range: from 25 % to 90 % RH
(relative SPL error ±0.05 dB)
Reference Conditions:
Ambient Temperature: 23 °C
Atmospheric Pressure: 101.3 kPa
Humidity: 30 % ÷ 80 % RH
Effective Microphone Load Volume: 250 mm³ for microphone type B&K 4134
Power Supply:
Battery Type: 2 × LR03 (IEC) / AAA (ANSI) alkaline batteries
Continuous Operating Time:
40 hours for 94 dB level
30 hours for 114 dB level
Stand-by Period: around two years
Electrical Requirements:
Minimum Voltage Requirements: 2.1 V DC
Maximum Operating Voltage: 4 V DC – absolute maximum supply voltage at the battery terminals
