01dB Acoustic Calibrators
Cal01 / Cal02 Class 1 and Class 2
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OVERVIEW
The calibrators Cal01 and Cal02 are sound pressure sources dedicated to the on-site calibration of noise measurement systems before and after each measurement session, as defined in most regulations.
Battery operated and lightweight, they comply with the specifications of the standard IEC942 as either class 1 (Cal01) or class 2 (Cal02) acoustic calibrators.
With its quasi-cylindrical shape, the calibrator is comfortable in the hand, and can be easily used. A single push button enables calibration level. The sound output is stopped automatically without user operation.
These devices may be used with either typical sound level meters or PC-based noise measurement systems independently of the weighting network or filter used because of a nominal sound pressure level of 94dB at 1000 Hz.
In higher background levels, the sound level of Cal01 can be amplified by 20dB or it may be attenuated by 20dB if, for example, a calibration signal is to be recorded on a digital tape recorder (DAT) in order to use the complete dynamic range of the tape.
In order to perform an accurate and valuable calibration in presence of extraneous noise sources that vary greatly, the calibrators Cal01 and Cal02 feature an acoustic and electronic control system driven by a micro-processor and controlled by an internal reference microphone.
Cal01 and Cal02 are designed for use with 1 inch microphones and delivered with 1/2 inch microphone adapter.
SPECIFICATIONS
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Acoustic calibrators Class 1 (Cal01) / Class 2 (Cal02) according to IEC 942 (1988) |
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PTB approval |
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Metrological characteristics * |
| Reference | Cal01 | Cal02 |
| Level | 94 ± 0.3 dB | 94 dB ± 0.5 dB |
| Amplification | +20dB / -20dB | - |
| Stability (better than) | ± 0.1 dB | ± 0.2 dB |
| Frequency | 1 kHz ± 2 % | 1 kHz ± 4 % |
| Stability (better than) | ± 0.5 % | ± 1 % |
| THD less than | 3 % | 3 % |
* for reference conditions (20°C, 1013hPa and 65% RH)
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Calibration certificate provided |
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Stabilisation time indicated by red LED |
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Emission duration greater than 1 min after stabilisation |
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Power supply by a 9V alkaline battery (IEC type 6LR61) for 25-hour continuous operation at 20°C |
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Diameter : 43 mm / Height : 90 mm |
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Weight : 180 g with battery |
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Delivered with a user manual, a 9V alkaline battery, a leather cover (Cal01) and an ½ inch microphone adapter |
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Optional adapters for 1/4 and 1/8 inch microphones |
PICTURE
Class 1 and Class 2 acoustic calibrators
