TRAFFIC CONTROL TELEPHONE SYSTEMS Circuit - Sam Hallas
TRAFFIC CONTROL TELEPHONE SYSTEMS Circuit - Sam Hallas
TRAFFIC CONTROL TELEPHONE SYSTEMS Circuit - Sam Hallas
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General<br />
PART 4<br />
4001-B SELECTOR TEST SET<br />
4901-B Test Set<br />
Fig. 11.<br />
The 4001-B Selector Test Set (Figures 11 and 12) is a portable set designed for<br />
testing selectors and selector sets for their electrical operation.<br />
The more important pieces of apparatus contained in the set are as follows :—<br />
The battery switching relay (A. Figure 12) code 4662-MAZ. The battery<br />
reversing or impulsing relay (B, Figure 12) code 4662-MAZ.<br />
Potentiometer YJ, code 4014-AG, shunted across B relay provides a means of<br />
adjusting the impulse ratio.<br />
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