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The CR517 Acoustic Calibrator meets ANSI S1.40:2006 and IEC 60942:2003 to Class 1. It is designed for use with the Class 1 or Class 2 sound level meters and noise dosimeters that NoiseMeters offers.
Hand held sound level meters generally expect a calibration level of 94 dB at a frequency of 1 kHz. Noise dosimeters, which mount on a worker's shoulder to monitor daily noise exposure levels, often expect a calibration level of 114 dB at 1 kHz. Rather than having two calibrators the CR517 can be switched on at either 94 dB or 114 dB for use with either noise measurement device.
Class 1 is the more accurate grade of calibrator designed for use with Class 1 sound level meters. As Class 1 matches or exceeds Class 2 in all areas, you can safely use a Class 1 calibrator with a Class 2 sound level meter or a noise dosimeter.
When the Calibrator is switched on it emits a 1 kHz tone at either 94 dB or 114 dB. The calibrator should be pushed carefully (firmly, but slowly) on to the microphone capsule of the sound level meter or noise dosimeter.
The meter should now be adjusted accordingly. Older sound level meters will have to be adjusted manually to the correct reading. Most modern meters (and all those supplied by NoiseMeters) adjust themselves automatically.
Most sound level meters calibrate at 94 dB. Many dosimeters calibrate at 114 dB but some calibrate at 94 dB. Check the specifications for your sound level meter and noise dosimeter to ensure you are calibrating at the correct level. If you get it wrong then the meter should reject the calibration.
|Standards||IEC 60942:2017 Class 1|
|Sound Level||94.0 dB ± 0.2 dB|
|114.0 dB ± 0.2 dB|
|Frequency||1 kHz ± 1%|
|Reference conditions||23°C, 101.3 kPa, 65% RH|
|Microphone size||½" (to IEC 1094-4)|
|Calibration adapter||QD7 for use with 1/4" microphone capsules|
|Battery type||1 x 9v (PP3, 6LR61, 6F22)|
|Dimensions||121 x Ø47 mm|
|Weight||220 g with battery|
|Controls||Push button start at 94dB, push again for 114dB|
|LED power indicator. Manual or auto switch off|
|CE classification||EN 61000-6-3:2007+A1:2011|