CTA Bridge and Accessories

The hotwire probes were driven by the commercially available DANTEC 56C17 constant temperature Wheatstone bridge circuits. The 56C17 CTA bridge is supplied as a plugin module for an existing 56C01 CTA system. The main unit 56C01 CTA delivers the servo-voltage as the output of the instrument. This voltage is a measure of fluid velocity. The 56C01 circuits contain servo amplifiers, filters, protective circuits, and a square-wave generator for dynamic balancing of the bridge.

Fig 3.19: Miniature Wire Probes { 5m diameter, platinum-plated tungsten wire, welded at the ends of prongs to provide active sensor length of 1.25 mm.