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2-30 these components has been discussed here and in other modules of the Navy Electricity and Electronics Training Series. If you have the desire or a need for an in-depth study of these components, the following are excellent references: Electronics Installation and Maintenance Books, NAVSEA 0967-LP-000-0130, for synchro and servo subjects. Electronics Installation and Maintenance Books, NAVSEA 0967-LP-000-0120, for the basic components of the servo system. These references should be available in the technical library of your ship or station. Q-25.   What the three basic components make up the typical magnetic amplifier? MULTI-LOOP SERVO SYSTEMS Now that we have gone through the various servo loops and their components, let's continue our discussion with a realistic application of a servo system. Very seldom will we find applications where one type of servo loop is used by itself. Usually several loops are combined through the use of various types of relays and switches. The many components of a complex system are caused to work together by switching them in and out as necessary. Figure 2-21 illustrates a practical application of a multi-loop servo system. You should be able to recognize by now the different loops and components that make up this system. Nothing is really new in the system; we discussed all the loops and components earlier in this chapter. Figure 2-21.—Multi-loop servo system. As shown by the relay conditions, the system is configured, in its normal state, as a closed-loop position servo. This is indicated by the heavy dark lines in the figure. An alternate configuration positions the load in this system by using the potentiometer. This is done by energizing relay K2, and switching the

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