THE L3 SYSTEM — QUALITY CONTROL IN MANUFACTURE 977 



placed outside the first band equal to N ± 0.5 A, designated in the gen- 

 eral specification as *'C" limits. 



The control limit for ranges is the customary upper 3-sigma value 

 computed by regular methods,^ and equals lASA. This is designated in 

 the general specification as the "^" limit. The product specification re- 

 quirements are expressed in the form N zL A so that the calculation of 



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Fig. 5 — A typical control chart (436A vacuum tube). 



