H HEUER INSTRUMENTS - LT51 LT51 Datasheet (705kB)
LT51View PC SW
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The LT51 Line Tester is a portable handheld battery powered instrument. It combines the features of several pieces of test equipment such as a Level Meter / Spectrum Analyser, Oscillator, Handheld DMM and TDR in the one small lightweight package.

It is the ideal instrument for testing, preparing and commissioning copper pairs for many types of telecommunication services such as ADSL2+, ADSL, HDSL, ISDN, voice frequency POTS, analog modem data and special digital services such as DDS.
The LT51 can be deployed as a stand-alone instrument in single-ending testing configurations to qualify cable pairs, or together with a second remote LT51, can perform more accurate terminated end-to-end testing. In stand-alone configurations (without PC control) testing can be automated with selected test sequences stored in the LT51. Alternatively the LT51 can be remotely controlled by a PC over the isolated USB link.

Common cable faults such as shorts, opens, poor splices, bridged taps, corrosion, X-Talk and Load Coils (for high speed digital services) are easily located with the LT51.

Great care has been taken to achieve easy operation of this instrument. Most functions are accessed by a single button press, or one further soft-key selection. Measurement results can be displayed graphically or numerically (in DMM mode) and can be simply saved into non-volatile memory for later recall or up-load to a PC for further evaluation and printing.

Protecting your Investment

Firmware upgrades with new features will be freely available from our website and can be easily downloaded to the LT51 in the field.

Following are features and benefits of the LT51:

  • Strong compact PC case designed to withstand rough treatment yet lightweight (< 1 kg)
  • High contrast, sunlight-readable graphics display with back-light
  • Large soft-touch keys with good feedback
  • Easy operation – one key press to set measurement mode then context sensitive soft-keys for configuration
  • >10 hours operation with easily replaceable AA NiMH batteries
  • Accepts commonly used 4mm banana plug test leads
  • Choice of Graphical or Numerical measurement display
  • Marker functions for navigating graphical displays using cursor
  • Remote control of LT51 by PC via serial port over Opto-isolated USB link
  • Easy Test result storage and recall, up-load to PC for further evaluation
  • End-to-End testing utilising pair under test to second remote LT51 (dial-up or dedicated pair)
  • Automated Test sequences or individual control of measurements
  • Selectable Impedance of 100 W, 135 W, 600 W and bridging (> 47 kW)
  • Level Spectrum, Return Loss, Noise, X-Talk and Balance Measurements up-to 2.2 MHz.
  • Load Coil Detector
  • Fully configurable Oscillator, up-to 2.2 MHz, -60 to +16 dBm
  • Single Tone or Swept measurements.
  • DMM functions DC/AC Voltage, DC Current, Loop Resistance, Leakage, AC Impedance
  • Highly accurate Resistance Fault Location using internal bridge
  • TDR for location and identification of low resistance or OC faults
  • Audio monitor (speaker) and Hands-free telephone for communication