This combines the functions of a telephone "Toner" (see Telephone Tool Kit) and a Time Domain Reflectometer, like the Tek 1502, into an inexpensive hand held unit. The sound of the toner can be changed if the correct pair is shorted at the far end. This confirms that the correct pair has been identified. An improvement on the classic Progressive Toner that might fail if many pairs are in close proximity and are imbalanced so there is severe cross talk.
Determines distance to fault on a 2 conductor pair that can be telephone, electrical power, cable television or ham radio coaxial cable, sprinkler wiring, or any 2-conductor cable.
One of the patented ideas is to change the drive impedance in order to see faults that might not show up if the drive impedance matched the cable impedance.
When connected to the coax going to a 1/4 wave ground plane antenna (DC open) it reads 46 feet.
When connected to the OE-254 bi-conical antenna it reads 104 feet and there's a stead beep (it's normally a DC short so that's OK).
6160405 Method and apparatus for remotely changing signal characteristics of a signal generator, Jovial Test Equipment Inc (then Harris, then Fluke), 1998-03-30 - Improved "Toner" method
Calls:6285195 Time domain reflectometry apparatus and method, David Needle, Jovial Test Equipment Inc (then Harris, then Fluke), 1998-03-16 - low cost ways around a few common problems.
5457441 Inductive amplifier having two-terminal auto-on function, Douglas S. Clement, Progressive Electronics Inc , 1993-06-04 - a classic "toner" fails when many pairs are close to each other.
6323654 Method and apparatus for remotely changing signal characteristics of a signal generator, David L. Needle, Stan F. Shepard, Gary Gin, Jovial Test Equipment (then Fluke, then Harris), 2000-08-31 - tone changed in response of shorting pair at far end (away from tester).
6509740 Methods and apparatus for time domain reflectometry, David L. Needle, Stan F. Shepard, Jovial Test Equipment Inc, (then FLuke, then Harris), 2000-04-07 - determining position of positive or negative "knee" on TDR plot.
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