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The ANM-2 Ambient Noise Monitor
What are the background noise levels in your audiometric test environment?
The ANM-2 ambient noise monitor displays the levels in real time, in real numbers, at octave bands as required by OSHA. 125 Hz and 250 Hz octaves are optional.
When connected to a Microsoft Windows®-based computer via an available USB port, the ANM-2 becomes a Type 2 Sound Level Meter with a Class II Octave Band Filter.
This system allows the operator to plug the microphone directly into the ANM-2 module when testing in an office environment or place the microphone inside a sound booth and patch it through to the ANM-2 module outside the booth. Either way, the noise levels in the test environment are sampled continuously and fed back to the operator via the computer display.
Results are displayed in a small (approximately 2" x 3") display and control panel as shown in the screenshot (right). Levels are updated each second, and thresholds exceeding predetermined limits are highlighted.
The system can also be set to alert the operator visually or audibly only when limits are exceeded. This allows the control panel to be minimized, and hidden from the computer display.
The ANM-2 is available with either an economy or professional class microphone. The economy microphone is adequate for OSHA compliance, with a noise floor at approximately 30 dB at 500 and 1000 Hz, while the professional class microphone has a noise floor of approximately 9-12 dB at 500 and 1000 Hz.
The microphones are completely interchangeable, though a recalibration with a sound calibrator is required when changing from one microphone type to another.
Features and Benefits
Monitor Instruments, Inc. 437 Dimmocks Mill Road, Suite 50, Hillsborough, NC 27278
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