1198 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1956 



B. Insulation Resistance Test on Single Unit Capacitors or Networks 



The insulation resistance test on single unit capacitors or networks is ; 

 the same as for dual units, except the second test circuit is not required 

 and test No. 2 cutout switch S21 is closed to operate test No. 2 cutout ' 

 relay K35 which eliminates the second test circuit and its sensitrol relay 

 K34. 



CONCLUSION 



This machine has been in successful operation on a multishift basis 

 for several years and has proven itself economically. Inspection of the 

 product tested shows that the machine's performance, quality wise, is 

 highly satisfactory. Difficulties that have been encountered were largely 

 those associated with product handling, contact fixtures, etc. Machines 

 of this type that are planned for the future will make use of circuitry 

 developed since this machine was built, but many of the features de- 

 scribed will be incorporated. 



ACKNOWLEDGMENTS 



The authors wish to acknowledge the contributions to the develop- 

 ment of this machine of G. E. Weeks of the Western Electric Company 

 S. V. Smith and S. E. Frisbee of the Electric Eye Company. 



