264 BELL SYSTEM TECBNICAL JOURNAL 



delay measurements. The circuit of Fig. 8 measures delay directly with a 

 single measurement and has the advantage of ignoring uniform phase vari- 

 ations with time. It is useful for making relative measurements on circuits 

 with long constant delay times. A significant improvement in the square 

 wave response of carrier amplifiers has been obtained by applying delay 

 equalizers based on measurements made with this equipment. 



