CR811C Class 1 Sound Level Meter

IEC 61672-1:2003 Class 1 Type 1 to IEC 60651, IEC 60804 and ANSI S1.4 Simultaneous Leq, SPL, Lmax,  Peak and Ln's (L10, L50, L90, etc). "A", "C" and "Z" (flat from 10 Hz to 20 kHz ± 1.5 dB) frequency weightings on channel 1. "C" weighting on channel 2 for simultaneous Peak measurements. RMS "Fast", "Slow" and "Impulse" time weightings. Clear graphical display with backlight. Rugged cast aluminum case. Seven Measurement ranges, covering: 21 to 140 dB(A), Peak 143 dB(C). Noise floor 18 dB(A). Powered by two AA cell batteries - over 30 hours operation. Dimensions: 13.3" x 2.9" x 0.9", 15.8 ounces 340mm x 75mm x 25mm, 450g Measurements stored for display or transfer to computer using the software provided. Available in a weatherproof Outdoor Measurement Kit 2 to 12 Year Warranty   Available for Hire

This precision grade sound level meter is particularly suitable for environmental noise measurement, including BS4142 surveys. With its Class 1 performance, removable microphone stem (can take a microphone extension cable), data storage and automatic timing functions it meets most environmental applications. It is also perfectly suited for the professional acoustician involved in noise at work applications.

Environmental and BS4142 Noise Surveys

The CR811C meter is ideal for general environmental noise surveys and for BS4142 (mixed residential and industrial) assessments. The ability to measure down to 21 dB(A) makes it suitable for locations with low ambient noise levels. For this type of survey it is often necessary to make repeating, timed measurements (e.g. measure every 15 minutes). The CR811C can be set to make such measurements, automatically restarting and storing parameters such as LAeq, L90, Lmax, and many others. It also stores the Leq every second, giving a graph of the noise level over time for further reporting and analysis.

Noise at Work Surveys

The European Noise at Work Regulations and HSE's Guidelines (Controlling Noise at Work) require the use of at least a Class 2 Integrating Sound Level Meter. The CR811C is a Class 1 meter and so is more than adequate. For more information, please visit our Noise at Work information pages.

Deaf Defier Software

The Deaf Defier software and download cable are provided at no extra cost with the CR811C. Click here for more information.

Additional Documentation

CR800C Series Datasheet (PDF, 694k) Deaf Defier Software Datasheet (PDF, 343k) Sound Level Calibrator Datasheet (PDF, 711k)