Amprobe SM-CAL1 Sound Meter Calibrator

The Amprobe SM-CAL1 is a sound meter calibrator for maintaining the accuracy of a sound level meter. It fits sound meters with microphones that have a diameter of up to 1/2 inch. It produces two fixed sound level signals, 94 decibels (dB) and 114 dB, and has an output frequency of 1,000 hertz (Hz). The calibrator operates on a 9V battery (included), and a low-battery indicator shows when the unit's batteries need to be changed. It meets European conformity (CE) directives and complies with American National Standards Institute (ANSI) and International Electrotechnical Commission (IEC) standards. The SM-CAL1 weighs 0.6 lb. (285 g), and it measures 4.9 x 1.9 x 0.5 inches (125 x 48 x 12.7) mm, H x D, where H is height, the vertical distance from the lowest to highest point, and D is diameter, the distance from left to right across the widest part of a circle).

Sound meters measure sound pressure levels both to check acoustic fidelity and to verify compliance with noise pollution regulations in health and safety codes. The meters are used in a range of environments, including homes, schools, airports, automotive and machine shops, concert halls, recording studios, and hospitals. There are two classes of sound level meters. Type 1 sound meters have a wider frequency response and a tighter tolerance than type 2 sound level meters, and they are commonly used in applications that require precise measurements, such as research and law enforcement. Type 2 sound meters are less precise than type 1 meters and are used for taking general measurements, such as measuring noise levels in a machine shop. Sound level meters are weighted for frequency response according to their intended use. The most commonly used weightings are A, C, and Z. The A weighting imitates the response of the human ear to soft or moderate noise levels and can be used in most environmental noise measurement applications. The C weighting imitates the response of the human ear to loud noises and can be used in noisy environments. The Z weighting measures flat frequency response between 10Hz and 20kHz and is often used for reference measurements.

Amprobe manufactures electrical testing equipment for commercial, industrial, and home use. The company was founded in 1948 and is headquartered in Everett, WA

What’s in the Box?

• SM-CAL1 sound meter calibrator
• (1) 9V battery (installed)
• Instructions