The Cable Locator Model 6681 from AEMC Instruments (Foxborough, MA) detects buried (in ground or in walls) telecommunications cables, electric power and other cables, as well as metal pipes, during modification or maintenance work on installations of category III (or lower), at voltages of 300V (or less) with respect to ground. The system can locate open circuits, shorts, track cables and locate fuses or circuit breakers. The instrument is a portable system that includes a transmitter, a receiver, and accessories. The transmitter and receiver both have a large back-lit LCD and keys.
The transmitter applies a modulated AC to the circuit that is to be located, which creates a proportional alternating electric field. The transmitter is also an AC/DC voltmeter; measured voltage is displayed along with a warning symbol. In addition, the transmitter has a self-test function, indicating a good transmission between transmitter and receiver. Both the transmitter and receiver units include a flashlight feature that assist the operator when working in dark unlit areas. Additional features include:
- The ability to operate in both single and two-pole modes and locate and trace hidden cables.
- The ability to detect and locate line breaks; faults in floor radiant heating systems; constricted sections of non-metallic pipes; circuit breakers/fuses; short circuits and live circuits.
- Backlight and flashlight functions
- Compliance with electrical safety standard EN 61010-1 and electromagnetic compatibility standard EN 61326-1.