EMAGS Study Guide - Rectifier, Potentiometer, Breadboard
8 Jan 2022
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To be familiar with the characteristics of a silicon-controlled rectifier (scr). To observe and evaluate the operation of an scr. Close sw1 applying power to the anode-to-cathode circuit. Adjust vaa until v1 measures 3 volts vcb. Measure and record anode current, if, in table 1. Repeat step 3 for every values of anode-to-cathode voltage (vcb) in table 1 and compute also the value of anode-to-cathode resistance, rcb, by substituting your measured values of vcb and if in the formula. Set vaa to 5 volts as measured across the power supply. Gradually increase the gate current, ig, by rotating the potentiometer until milliammeter m2 measures a gate current of 0. 25 ma. M1 will measure anode current (if) and v1 will measure anode-to- cathode voltages (vcb) as well as the voltage across the load (vac). Repeat steps 6 and 7 for five (5) more times, increasing gate current by 0. 10 ma each time and recording the results in table 2.
