Manuals / 3M / Computer Equipment / Noise Reduction Machine

3M A121 Mode Configuration, Status Indication Table, Final Checkout Procedure

Models: A121

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Mode Configuration

The 3M Noise Reduction Board can be configured in several different modes by setting DIP switch, SW2. Following is a brief description of each mode and a DIP switch setting table.

Noise Reduction: With SW2 number 1 ON, the inbound microphone voice signal is digitized. The noise is digitally removed from the voice and converted back to an analog voice signal. The analog voice signal is then sent to the microphone input of the intercom.

Echo Reduction: With SW2 number 2 ON, echo is reduced for full-duplex intercom systems. Set SW2 number 2 OFF for half-duplex systems.

Restaurant/Truck Stop Noise Reduction Level: With SW2 number 3 OFF, the A121 is set for restaurant noise reduction level. With SW2 number 3 ON, the A121 is used for truck stop noise reduction level, which provides more noise reduction with slightly more voice degradation.

Hi Frequency Equalization: With SW2 number 4 ON, the higher-end frequencies are increased by 3 dB. This should be set to the customer’s preference.

SW2

ON Position

OFF Position

Number

 

 

1

*Noise Reduction ON

Test Mode

 

(Normal Mode)

(Factory use only; do not change.)

2

*1Echo Reduction ON

Echo Reduction OFF

3

2Truck Stop Noise

*2Restaurant Noise

 

Reduction Level

Reduction Level

4

2Hi Frequency Equalization

*2Hi Frequency Equalization OFF

 

ON

 

5

Not Used

Not Used

Notes: * Indicates factory settings.

1Must be ON for 3M, HME, and Panasonic Full Duplex Systems

2Set to customer preference.

Table 2. 3M Noise Reduction Module SW2 Settings

Status Indication Table

The condition of the red LED on the 3m Noise Reduction Module indicates the current status of the unit. The LED can be off, blink at defined intervals, or be constantly lit Table 3 illustrates the status indicated by the LED.

Status

LED

Power OFF

LED off.

Normal Mode

LED blinks once per second.

Test Mode

LED blinks three times per second.

Fault Condition

LED is solid red (constantly illuminated).

Table 3. 3M Noise Reduction Module Status Indication

Final Checkout Procedure

1.Turn the ON/OFF switch of the A121 ON. The red LED should blink slowly. Listen for a reduction in the background noise.

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3M A121 installation instructions Mode Configuration, Status Indication Table, Final Checkout Procedure
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A121 specifications

The 3M A121 is a high-performance adhesive that stands out in the market for its unique formulation and reliable performance in a variety of applications. Designed for bonding a multitude of materials, the A121 is particularly favored in industries such as automotive, electronics, and construction. Its versatility makes it an essential tool for professionals who demand precision and strength from their adhesives.

One of the standout features of the 3M A121 is its exceptional adhesion properties. The adhesive is formulated to bond effectively to both porous and non-porous surfaces, providing a strong hold that can withstand demanding conditions. This versatility allows users to apply the A121 in a range of settings, from assembly lines in manufacturing to repairs in residential and commercial construction.

The adhesive is also notable for its quick curing time, which enhances productivity by reducing the time required for projects. It is designed to reach full strength within a matter of hours, enabling faster turnaround times in both factory settings and field applications. This feature is particularly advantageous in fast-paced environments where time is of the essence.

In terms of technological advancements, the 3M A121 incorporates innovative adhesion technologies that enhance its performance. Its unique silicone technology allows for excellent moisture resistance, making it suitable for applications exposed to humidity or water. This characteristic is vital for industries like electronics, where moisture can compromise the integrity of the bond and the performance of the components involved.

Additionally, the A121 is known for its superior temperature resistance. This quality ensures that the adhesive maintains its bonding capabilities even under extreme heat or cold conditions, expanding its usability across various environments. This resilience makes it a preferred choice for automotive applications, where components often experience significant temperature fluctuations.

The 3M A121 is user-friendly as well; it can be easily applied with standard dispensing systems, ensuring a smooth and even application. The adhesive does not require complex preparation, making it accessible for both professional applicators and DIY enthusiasts.

In conclusion, the 3M A121 adhesive stands out for its exceptional adhesion properties, quick curing time, and advanced technologies that provide moisture and temperature resistance. Its versatility and ease of use make it an indispensable product for various industries, ensuring strong and reliable bonds in all applications.