Electrical parameter limit detection for mass production - involves bridge and threshold detectors to detect rapidly if parameters are outside required limits

摘要

A simple bridge arrangement connected to suitable threshold detectors and amplifiers is for checking the resistance of electric bulbs, which may be done by mounting each bulb in the bridge and subjecting it to a current pulse. The exact voltage drop is detected and if this lies outside the limits required, the electronic threshold detectors bridge in the network signify the excursion. The bridge contains a resistors chosen to represent the ratios demanded other resistors chosen to represent the ratios demanded over the nominal values for the upper and lower acceptable limits. The bridge is a.c. excited, and three outputs are monitored by the electronics to check the parameter reading.