General
Frequency	1 kHz

The C.A 833 calibrator from Chauvin Arnoux is a standardised sound source specifically developed for the calibration of sound level meters. The device serves as a reference source with a fixed frequency of 1 kHz and offers two defined calibration levels: 94 dB and 114 dB. These values correspond to the standard reference levels commonly used in measurement technology for testing and adjusting sound measuring devices. The calibrator is intended for use with models C.A 832, C.A 834, and C.A 1310, with compatibility based on mechanical adaptation to microphone connectors and electrical signal processing of the devices.

Applications

The C.A 833 calibrator is used in laboratory and outdoor applications to verify the accuracy of sound level meters. It enables regular testing of devices to ensure that measurement results meet the requirements of relevant standards. The application is suitable for both controlled environments and field use, where quick and reliable calibration is necessary to avoid measurement errors.

Functions and Equipment in Detail

The device provides two fixed sound levels, selectable via a simple switch or mechanical selection option. The frequency of 1 kHz is an internationally recognised standard for sound level calibration, as it provides a stable and reproducible reference. Calibration is performed by attaching the calibrator directly to the microphone connector of the sound level meter, thereby checking the microphone sensitivity and the entire measurement chain.

Technology Explained Simply

The calibrator generates a constant sound level defined by IEC 942 Type 2 standard. This standard specifies requirements for accuracy, stability, and frequency of the sound source to ensure uniform calibration worldwide. The sound source is designed to maintain high stability at the specified levels, which is crucial for the reliability of calibration. The frequency of 1 kHz lies within the human hearing range and is therefore used as a reference for sound level measurements.

Compatibility and Accessories

The calibrator is designed for microphones with diameters of 2.5 cm, 1.3 cm, and 0.64 cm, enabling broad applicability with various sound level meters. Compatibility with models C.A 832, C.A 834, and C.A 1310 is ensured by mechanical fit and electrical requirements of the devices.

Mounting and Installation

Mounting is achieved by directly attaching the calibrator to the microphone connector of the sound level meter. No additional mounting or installation is required. Operation is performed via a simple switch to select the desired level. The devices are designed for tool-free handling.

Advantages in Operation

The C.A 833 calibrator enables fast and precise verification of sound level meters. The fixed levels and standard compliance ensure reproducible calibration. Support for various microphone diameters increases flexibility and reduces the need for multiple calibrators. The portable design makes the device suitable for mobile applications.

Batteries are not included in the delivery scope.