The cable signal inspection system (CMA-100) is a high-gain cable system inspection device that can be used to detect and identify certain monitoring equipment connected to the building line. Including: telephone lines, local area networks, server systems, security systems, etc. This multifunctional amplifier has a built-in AC/DC digital voltmeter, optional filters and a very wide dynamic range. Balanced and unbalanced high-impedance inputs can be connected to a variety of suspicious wires. CMA-100 also provides an adjustable DC bias voltage from -15V to +15V, which is commonly used in equipment that is sensitive to voltage and current and compatible with many types of line connections. All these functions are attributed to this complicated automatic gain control circuit, which cannot be matched by any other similar equipment.

     Brand: REI
     Model: CMA-100

1. Product introduction:
 
The cable signal inspection system (CMA-100) is a high-gain cable system inspection device that can be used to detect and identify certain monitoring devices connected to building lines. Including: telephone lines, local area networks, server systems, security systems, etc. This multifunctional amplifier has a built-in AC/DC digital voltmeter, optional filters and a very wide dynamic range. Balanced and unbalanced high impedance inputs can be connected to a variety of suspicious wires. CMA-100 also provides an adjustable DC bias voltage from -15V to +15V, which is commonly used in equipment that is sensitive to voltage and current and compatible with many types of line connections. All these functions are attributed to this complicated automatic gain control circuit, which cannot be matched by any other similar equipment.

 
2. Principle application
The CMA-100 wired signal inspection system is an ideal tool for analyzing signals in various wiring. By using unused telephone dual wiring or LAN wiring to directly connect the isolated loudspeaker in a suspicious environment. Connect the CMA to the line to be detected through the connection line equipped in the equipment, and collect and detect various information in the line through different filtering, gain, bias and other functions in the equipment to detect whether there are abnormal signals in the line. It works by analyzing, capturing, and inspecting the changes in electromagnetic signals in the line. The electromagnetic signals generated by the changes in the electrical signals in the telephone line. The equipment analyzes and tests the frequency, intensity and modulation of the electromagnetic signal in the line to check the specific wiretapping of the communication line Information.
 
3. Technical description
 
input resistance:
50k ohm balance

Normal mode suppression: >75dB

Maximum available input: 31Vp-p

Pre-amplified automatic attenuator: 0 to -40dB (overload warning issued by LED)
Automatic gain control:
Dynamic range: 145dB

Manual gain control: 0, 25, 50, 75, 100dB

Headphone gain control: 0-15dB

Maximum system gain: 115dB
Frequency response:
Without filter: 25Hz-44KHz

High pass filter: 320Hz-44KHz

Low pass filter: 25Hz-3.2KHz

Band pass filter: 320Hz-3.2KHz
Headphone audio output:
Line audio output: 600 ohms
Bias control:
       0 to +/-14.5V DC voltage, maximum 5mA (when the current protection is exceeded, the input impedance is reduced to 3.6k ohms)
Digital voltmeter:
3.5 digital bits, automatic clearing, automatic polarity conversion, +/-199.9v DC or AC power on/low battery LED

​(LED @6.9v)

Battery: 9V alkaline battery (usual time is generally 5-30 hours)
Maximum input voltage:
250 DC or AC

Leakage resistance: >10 megohms
specification:
​7.3in×2.75in×1.75in is (185.4mm×69.8mm×44.5mm)
weight:
       12.1 ounces (343g)