ACT 452
Telephone Test Set

The ACT 452 is a trusted tool for telecom installation and maintenance - ideal for checking potential faults on telephone lines where an alarm communicator is fitted. The ACT 452 operates safely in situations where telephone wiring may be carrying digital traffic, voltage feed to remote electronics or the hazardous voltages that result from fault conditions or misuse of the cable.

Features

• Safe to use on analogue and digital lines
• ‘TALK’ and ‘MONITOR’ modes enable lines to be tested without disrupting signals
• Digital Service Protection (DSP) enables safe operation where telephone wiring may carry digital signals, hazardous voltages or fault connections
• ‘POL’ test button with green/red LEDs indicate correct or
  reverse A/B polarity connection
• Built-in over current protection against 230VAC and lightning surges
• Active polarity and fault LED indication
• Battery saving auto power on/off
• 3 position volume boost control with easy tone/pulse selection and finger tip microphone mute
• Rugged, drop proof design with belt hook
• Supplied with operating instructions and line cable with red/black crock-clip connecton

Specifications

Long Line Operation: With a 48V Feed > 5K Ω Loop, Minimum Current < 10Ma
DC Resistance: Off-Hook Talk Mode: < 300 Ω, On-Hook Idle: > 5M Ω (10Ua @ 48VDC)
Monitor: > 5M Ω (20Ua @ 100VDC)
Monitor Impedance: 100K Ω @ 1Khz
Dial Pulse Dial: 100Pps Break 60%
DTMF/Tone Dial Level: -3Dm Typical
Flash/Timed Break Recall: 100Ms (Switchable 600Ms, 300Ms)
Memory Dial: 32 Digit Last Number Redial
PBX Pause: 2 Seconds
Alkaline Battery LED: One Year Normal Use
Low Battery Indication: 2 Hours remaining continuous use
Automatic Power Shut Off: Five minutes after disconnection

IN THE BOX ACT 452 Telephone Test Set, crock-clip leads and instructions