THE L3 SYSTEM — QUALITY CONTROL IN MANUFACTURE 



987 



Table III — Yield of Coils Produced Under the Distribution 



Requirements 



Code 



AWA21 retard . 

 AWA22 retard . 

 302AW retard . 

 302AY retard.. 

 302BA retard . . 

 302E retard . . . 

 320F retard. . . . 

 320G retard . . . 

 320M retard . . . 

 320N retard . . . 

 320P retard. . . . 

 1500A inductor 

 1500B inductor 

 1507A inductor 



1507C inductor 



1507D inductor 



1507E inductor 



Nominal Values 



L — Microhenries 



R— Ohms 



191.61 



166.2 



1.58 



3.70 



1.425 



3.52 



26.11 



19.62 



1.428 



18.0 



0.874 



43.53 



40.44 



283.9 



■260.8 



78.2 

 2025 



6.5 

 166.6 



23.9 

 1655 



Tolerance 

 Per cent 



ifc 



^^'^'^^o^--'^<^-^'^^r^fj£i 



1.0 

 2.0 



10.0 

 5.0 

 1.3 

 1.1 

 1.7 



10.0 

 1.0 

 2.0 

 1.0 

 1.0 

 1.0 

 7.0 

 7.0 



4.0 

 2.0 



2.0 

 5.0 



5.0 

 5.0 



514 



342 



545 



410 



702 



514 



702 



653 



307 



54 



10122 



1883 



738 



560 



685 



881 



828 



90 



6 







47 



140 



35 



130 



1 



53 







41 



121 



12 



10 



71 



230 



88 



Note : Production includes product manufactured which did not fall within 

 the "A" Limits. 



the distribution specification. In the case of the 302BA and 320F retards, 

 the lower yield of these coils was found to be due to machine variations 

 which have been corrected. In the case of the 1507D inductors, an addi- 

 tional limitation is caused by the lack of fine enough machine pitch con- 

 trol to permit proper manufacture of this coil. A new winding machine 

 having adequate control is being provided to eliminate this condition. 



It has become apparent, as production has progressed, that the manu- 

 facture of coils, such as are given in Table III, is going to remain a small 

 lot business. Therefore, in all probability, the great majority of the pro- 

 duction will be shipped by the three-cell method, with only a few cases 

 of enough production to warrant the use of the Batch or Continuous 

 methods where advantage can be taken of the sampling procedures. 



3.3 application to capacitors 



3.31 600-Type Molded Mica Capacitors 



The 500-type molded mica capacitors have been one of the most 

 difficult products to control within the requirements of the distribution 



