Narrow Band Shunt Tester



Narrow Band Shunt Tester


The widespread use of motion sensing and constant warning time track circuits has resulted in the proliferation of wide and narrow band shunts and IJ couplers. Many times the circuits are overlapped, resulting in ever-increasing problems of tuning and frequency conflict. The troubleshooter needs to know the complete range of characteristics of the shunts couplers with which he is dealing, when attempting to identify the source of the circuit malfunctions. This device permits the frequencies, tuning characteristics, Shunts, Couplers, and Transmitters attenuation, thru-put capacities and transmitter output frequencies of each device in the approach “network” empowering him to relatively quickly determine the source of the problem.



  1. Identify center frequencies of shunts, couplers and related transmitters
  2. Determine termination and signal thru-put capacities
  3. With data from tester, rule out shunts as sources of tail ring
  4. Adjust tunable couplers and shunts prior to installation
  5. Test for DC leakage
  6. Frequency range: 10HZ to 5120HZ
  7. For field or shop use
  8. Operated on rechargeable, 12VDC, 1.2AH lead acid battery


  9. Application

    This highly portable device permits the maintainer to bridge or terminate signals into the shunts or couplers under test. It can be moved to the area of the track where the shunts or couplers are in service, maximizing effectiveness and minimizing time required to perform the tests.

    “Sweep” Function automatically check full range for tuning points. Graphic display pictorially shows frequency curves and tuning points.

    Separate inputs for Tuning, Leakage and Frequency Meter Tests reduce potential for resistance in switch contacts to adversely affect test results.

    ORDERING REFERENCES
    Description Part Number
    322 Tester with 12V rechargeable battery, AC to DC Charger, Leads Carrying Case 322-2
    ACCESSORIES FURNISHED
    In-Vehicle Charging Adapter 324-12
    Charger/Wall Box, 120VAC to 12VDC, 500mA 324-11
    Lead Set, 4ft. HD Clips 322-15