2.2 SCR and Optical Trigger Circuits The SCR and optical trigger circuits are described in detail in APPENDIX I. Preliminary testing of the trigger circuits is shown in Fig. 2.8. After suitable circuits were obtained, prototype circuit boards were made and tested with phase one sector four drive coils in their actual locations at full power. This was done to test for false triggering and pickup problems before freezing the circuit board designs. Testing of these circuit boards is shown in Fig. 2.9. Fig. 2.8 Preliminary testing of SCR and optical trigger circuits.
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