Using the CMA REI | REI CMA-100 specs

USING THE CMA:

REI

Single Line and Balanced Line Connections

The CMA provides for connections to either single line systems (typically a single line with a ground such as coax) or a balanced pair line such as telephone or LAN wiring. For Single Line systems:

∙Connect the Green grounding connector to the Black connector.

∙Connect the Black connector to wiring ground.

∙Connect the Red connector to the single line to be tested.

For Balanced Pair systems:

∙Connect the Green grounding connector to earth ground if available (if not available, do not connect to anything).

∙Connect the Black connect one of the wires to be tested.

∙Connect the Red connector to the other wire to be tested.

Signal Power Levels

Signal power levels may vary dramatically. The CMA has two systems that allow the unit to respond automatically to a wide range of audio levels. The automatic input attenuator prevents gain distortion for situations when the input voltage levels exceed 0.3 volts.

But, more importantly the Automatic Gain Control Function has a dynamic range of 105dB. In basic terms, this means that that the unit can automatically adjust to audio signals ranging from 2 microvolts to 0.3 volts.

Strong Signal Interference

If the input is attached to an AC voltage greater than 40 volts, the audio content will be masked.

Signal Frequency Interference

Wiring in a building is very susceptible to interference from ambient electromagnetic noise sources. The most common type of audio interference is from the AC power lines. This noise is typically either 50 or 60Hz fundamental frequency; however, there are harmonic frequency components that also cause interference at 100/120Hz, 150/180Hz, and possible up to 200/240Hz. For this reason, the CMA has a built-in High Pass filter that filters out audio noise below 320Hz.

Also, high frequency electromagnetic noise can interfere with audio signals. This type of higher frequency noise can be generated from industrial machinery, computers, fax machines, and digital phone systems. Hence, the CMA has a built-in High Pass filter that filters out audio noise above 3,200Hz.

Providing DC Bias

It is a common practice to utilize electret type microphones for audio surveillance, and electret microphones require a voltage supply in order to function. Therefore, when evaluating suspect wiring, if the wiring does not have any voltage on the line, it is recommended to apply a DC bias voltage to activate any potential microphones. The DC Bias Voltage should only be used after ensuring that the line does not have an active

CMA-100 specifications

The REI CMA-100 is a versatile and innovative outdoor equipment solution designed to elevate the outdoor experience for adventurers and explorers alike. Engineered with the latest in outdoor technology, the CMA-100 is ideal for hiking, camping, and various recreational activities.

At the core of the CMA-100 is a robust construction that ensures durability and reliability in the face of rugged terrain. Made from high-quality, weather-resistant materials, it’s capable of withstanding the elements, making it a trustworthy companion in challenging conditions. The compact design allows for easy transportation and storage, making it perfect for both short trips and extended expeditions.

One of the standout features of the REI CMA-100 is its advanced modular system. This offers users the flexibility to customize their gear setup depending on the activity and personal preference. From adding extra compartments for gear organization to integrating specialized attachments for tools and accessories, the modular system enhances usability and functionality.

The CMA-100 also incorporates innovative weather shielding technology. Its advanced fabric weave provides enhanced water resistance while still allowing for breathability, ensuring comfort during varying weather conditions. This feature is particularly valuable for those unexpected downpours that can occur while enjoying nature.

Comfort is another key aspect of the CMA-100. The product features ergonomic design elements, including padded straps and a ventilated back panel, to minimize fatigue during long treks. These design choices ensure that the user remains comfortable even when carrying a fully loaded pack for extended periods.

Technologically, the CMA-100 is equipped with integrated hydration systems. This allows users to stay hydrated without interrupting their adventure. The system accommodates various hydration reservoirs, making it easy to fill up on the go.

Furthermore, the CMA-100 is designed to be environmentally friendly, with sustainable materials and practices involved in its production process. This aligns with the growing trend among outdoor enthusiasts who prioritize eco-conscious choices.

In summary, the REI CMA-100 stands out in the outdoor gear market for its durability, customizability, advanced technologies, and overall user comfort. Whether embarking on a day hike or a week-long camping trip, the CMA-100 is engineered to meet the needs of all outdoor lovers, ensuring a seamless and enjoyable outdoor experience.