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Techniques for Attaching Leadwires
to Unbonded Strain Gages

Leadwire Preparation

  1. Select wire type and size to be used according to recommendations outlined in Leadwire Selection .
     
  2. Thermally strip approximately 1/4 in (6 mm) of insulation from end of wire to be attached to gage. (Thermal stripping prevents broken or nicked wires often resulting from mechanical stripping methods.)
     
  3. Tin exposed wire with solder selected.
     
  4. Trim tinned conductor so that approximately 0.1 in (2.5 mm) extends from end of insulation. Longer tinned conductor length is not advisable since it may extend beyond gage backing and contact specimen during gage bonding and clamping.

Note: Whenever possible, a three-leadwire system should be employed on single gage (quarter-bridge) installations. The use of two-wire systems should be limited to dynamic-only strain measurements or in static measurements where the two-lead system is not more than a few inches long and can be connected to a three-lead cable for routing to the measuring instrument.



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