The Alert 340 Test Telephone incorporates all the Nautilus design features that provide a durable and robust instrument for applications where DigAlert? circuit technology is not required or necessary.  An ADSL filter is also incorporated.

Digital Services Protection (DSP) Test Telephones are designed to operate safely in situations where telephone wiring may be carrying Digital traffic, Voltage feed to remote electronics or Hazardous voltages that result from fault conditions or misuse of the cable. The Alert 340 also features loud-speaking (listen only) capability.

FEATURES

? Three year warranty

? Digital circuit safety

? Voltage alarm and lock-out

? ADSL filter

? Loudspeaker listening

? Volume boost

? Microphone mute

? Confirmatory key beeps

? Talk/Monitor status LED

? Battery low audible tone

? Tone/ pulse

? Redial (10x24 memories)

? Flash

? Pause

? Super Hi Z polarity

? Super Hi Z monitor

? High monitor level

? Warble ringer

? Selectable ringer tones

? High impact resistance

? High chemical resistance

? Quick change cord

? Quick change battery

? Easy shoulder placement

? Rugged belt clip

In the ?on hook? mode, on connection to a circuit, the Test Telephone sounds an alarm to alert the user to the presence of  voltages above 75V DC. Such voltages are normally present on circuits carrying digital services. If the circuit is active, the user can select the high impedance MONITOR mode and listen to the sound to determine if the circuit is carrying digital services without disrupting the traffic.

Selecting ?off hook? mode will stop the alarm signal and loop the line without damage to the test set. If the alarm signal persists, it indicates that the voltage on the line is above 120V. In this case the line is not looped avoiding damage to the test set as well as alerting the user to the presence of hazardous voltages.