The unit has been developed with British Telecom to locate Submarine Telephone Cables. The method employed is the wellestablished electroding technique. The unit is self-contained, desk top mounting, enabling tests to be carried out withoutthe power feed connected to the cable under test.

Beach Probe

Output	Continuously adjustable current regulated d.c. - sine wave modulated.
Cuttent Range	Minium 75mA modulated at ±25mA (50mA - 100mA pk-pk).Maximum 275mA modulated at ±225mA (50mA - 500mA pk-pk).
Current Control	Continuously adjustable by 10-turn potentiometer.
Mains Switching	Key operated. The key is removable only in the off position.
Voltage	500V peak max.
Polarity	Output polatiry is selected by means of a 3 position key switch (positive, Off Negative). The Key is removable in any position.
Monitoring	Both current and voltage are continuously monitored by individual front panel meters of accuracy 3% F.S.D.