Download e-book for iPad: Basic Alarm Electronics. Toolbox Guides for Security by John Sanger

By John Sanger

ISBN-10: 0409900370

ISBN-13: 9780409900378

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Figure 3—11 shows an example of a troubleshooting procedure to help find a problem in the circuit of the flashlight previously men­ tioned. The flowchart takes you through the troubleshooting proce­ dures step by step. PROGRAM EVALUATION AND REVIEW TECHNIQUE The Program Evaluation and Review Technique (PERT) was devel­ oped by the United States Navy for the Polaris program. It is a tool for planning, executing and controlling complex tasks. PERT's main objective is to furnish information. The technique does not make decisions.

14159 . . 1416) change of Table 3-6. 000000000001 49 50 BASIC ALARM ELECTRONICS Table 3 - 7 . Common Mathematical Signs and Symbols oo + — ± x -v/ = — ~ Φ ~ < < > > —> : # % @ π () [] j) ° ' " . . 14159 parentheses, encloses common group of terms brackets, encloses common group of terms which also includes terms enclosed in parentheses braces, encloses common group of terms which also includes terms enclosed in brackets degrees (temperature or arc) minutes, prime seconds, double prime (elipsis) and beyond 4 Ohm's Law Here is a quiz question: Is there a relationship between current and voltage?

Working voltage ranges from as little as 3 to more than 700 volts. Figure 2-13. Adding a positive ( + ) sign to the capacitor symbol indicates that the capacitor is polarized. 24 BASIC ALARM ELECTRONICS Figure 2-14. An arrow through the symbol for a capacitor means it is a variable capacitor. Tantalum Capacitors Like electrolytic capacitors, Tantalum capacitors only can be used in DC circuits. These capacitors tend to be smaller than their electrolytic counterparts. They are more precise and are not as prone to drying out when not in use.

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Basic Alarm Electronics. Toolbox Guides for Security Technicians by John Sanger


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