H HEUER INSTRUMENTS - LT41 LT41 Datasheet (290kB)
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The Line Tester LT41 is a handheld battery powered instrument for testing Voice Frequency transmission circuits and lines used for xDSL upto 200 kHz. The main characteristic of the LT41 is the large number of facilities provided in such a small package.

It combines the features of a comprehensive Line Tester (including Audio Oscillator, Noise Meter, Return Loss, Impulsive Noise, Dropout Testing) with the fully Automatic Loss Measurement (ALM) function.

ALM is used in conjunction with a second LT41 acting as a responder to automatically evaluate bi-directional loss over the PSTN or a pair of data lines.

Telephone conversation is supported via a plug-in handset. Ring voltage, loop voltage and loop current is measured and line activity is monitored by a speaker.

Great care has been taken to achieve easy operation of this instrument. All functions are activated by one button. Most instruments of this complexity revert to menu tree mode selection thereby necessitating handbook guidance or on screen help. The LT41 can be operated without these aids. Measurement results can be stored for later PC evaluation and printing.

The following features are provided:

  • 100 hours operation with dry cells
  • Battery voltage monitor
  • 200 kHz Level Meter (ITU-T O Supp 3.1)
  • 20 Hz to 20 kHz Oscillator
  • Level recorder
  • Channel and Psophometric Filters (ITU-T O.41)
  • Automatic Loss Measurement (ALM) to second LT41
  • Return loss measurement
  • Closed-box electronic calibration
  • Impulse Noise Event Counter (ITU-T 0.71)
  • Simple Interruptions (ITU-T O.61)
  • Noise measurements
  • 600 W, TN12, 100 kW
  • Audio monitor
  • Line voltage, current and ringing
  • Telephone
  • Data storage
  • Opto-isolated PC-interface