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Fisher TW-7700 manual

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Table of contents for the manual

  • Page 1

    TW-7700 Operating Manual FISHER RESEARCH LABORATORY Digital Line Tracer[...]

  • Page 2

    Description .............................................................................. pg. 3 Transmitter ............................................................................. pg. 4 Receiver ................................................................................... pg. 5 Accessories ..............................................[...]

  • Page 3

    DESCRIPTION 1 3 The TW-7700 Digital Line Tracer consists of a transmitter, receiver, ground-plate/ground-rod assembly, carrying case (hard or soft), and an operators manual. The TW-7700 is a single frequency line tracer. The TW-7700 is an active locating line tracer. There are three methods of active locating that an operator can use to trace a uti[...]

  • Page 4

    4 TW-7700 TRANSMITTER Transmitter WARNING: Do not handle output leads unless power is off. ELECTRIC SHOCK HAZARD: Servicing to be performed by qualified personnel only. Located on the transmitter are the power mode and the accessory output. The power mode enables the operator to turn the transmitter on or off, and to check the condition of the batt[...]

  • Page 5

    5 Receiver Mode This button does not have a function on the TW-7700. (It allows users of the TW-8800 Multi-Frequency Line Tracer to change frequencies.) Power On/Off Turns the receiver on or off. Light Lights up the display for usage in dark areas. When the display is backlit, LIGHT is shown on the bottom left hand side of the display screen. Bat P[...]

  • Page 6

    6 TW-7700 RECEIVER Frequency Modes The frequency at which the receiver is operating. << Left/Over Target>/Right>> Indicates where the receiver is in relation to utility. Numeric Display Serves a dual function: •Relative signal strength of the transmitted signal (% shown). Responds in conjunction with the bar graph. •Depth to the [...]

  • Page 7

    7 ACCESSORIES The coupling clamp is useful when the utility is exposed, and a direct connection is not possible. It is plugged into the same plug-in socket as the ground-plate/ground-rod assembly. The coupling clamp only operates at the 82 kHz frequency. The coupling clamp will fit around utili- ties that are 3-¼ inches in diameter or smaller. The[...]

  • Page 8

    Set-up Transmitter either Inductively or Conductively Inductive Be aware of air coupling, the transmitted signal travelling to the Receiver via the air, not the utility. Conductive Connect the ground plate/ground rod assembly to the trans- mitter. Connect the red lead to the non energized utility. Con- nect the black lead to the ground plate/ground[...]

  • Page 9

    DEPTH ACCURACY Depth measurement is a feature of the TW-7700. Accuracy is defined on an ideal target, that is, one that is continuous, a good conductor, and not surrounding by other utilities. There are factors that can cause the operator to question the accuracy of the utility being traced. Inductive Transmitter Setup Inductively, only a small por[...]

  • Page 10

    SPECIFICATIONS Subject to improvement or modification without notice. 10 TRANSMITTER RECEIVER Depth Accuracy ...................... +1 inch per foot in nominal condi- tions Readout Units ........................ Inches or cm (factory preset) Left/Right Guidance ............... Audio: continuous tone=Left, pulsed tone=Right. VCO (varying pitch) outp[...]

  • Page 11

    NOTES[...]

  • Page 12

    FISHER RESEARCH LABORATORY 200 W. Willmott Rd., Los Banos, CA 93635 Tel 209.826.3292 Fax 209.826.0416 www.fisherlab.com email:info@fisherlab.com EXPORT DEPARTMENT P.O. Box 1896 New Haven, CT 06508 USA Tel 203.288.1638 Fax 203.287.8099 email:mb@exportdept.com QUALITY Fisher detectors are renowned for their quality. Each detector is hand crafted in t[...]