> AUTOMATIC MACHINE FOR TESTING CAPACITORS AND NETWORKS 1187 

 ELECTRICAL ASPECTS OF TESTING MACHINES 



Tests are applied to the product in sequence during one revolution of 

 the turret. 



1. Dielectric strength test between terminals and can, and between 

 terminals and studs. 



2. Dielectric strength test between units in the same can when the 

 can contains two units. 



3. Dielectric strength test between terminals of each unit. 



4. Impedance test. 



5. Capacitance test. 



6. Insulation resistance test. 



Dielectric Strength Test Circuit Operation 



Since the three dielectric strength tests are made on similar circuits, 

 the operation of one of these circuits is described using the nomenclature 

 and circuit designations shown in Fig. 7. A graphic interpretation of the 

 circuit operations shown in Fig. 7 is given in Fig. 8. 



The "heart" of each circuit is a calibrated current sensitive relay K2 

 that operates on minute values of current resulting when a defective 

 unit under test attempts to charge on the "test" commutator position. 



CAPACITOR ATTACHED TO INITIAL 

 ICHARGE COMMUTATOR SEGMENT 

 I 



3 SECONDS 



TEST 

 CAPACITOR 



® 



DEFECTIVE 

 PRODUCT 



; CAPACITOR CHARGED 



ACCEPTABLE /Os 

 PRODUCT W 



K2 

 K3 

 K4 



o- 



CAPACITOR 



ATTACHED 



TO TEST 



SEGMENT 



OPENS K5 



OPERATORS PATH 



(PRODUCT REJECTED) 



K2- 



K3- 



I-l 

 LAMP 



TEST CIRCUIT 

 NORMAL 



-> 



RESETS 



TEST 

 CIRCUIT 



T 



■^ 



2 SECONDS 



v;s2 



CAM SWITCH 



--K5 



2| SECONDS 



S4 



CAM SWITCH 



K9 



CAPACITOR 

 DISCHARGED 



--K7,K11 



ACCEPTANCE 

 SOLENOID, 

 PRODUCT 

 ACCEPTED 



wCAMMED TIME 

 ■SWITCH 



:k6 



K2 

 K3 



--*^^1 %^\ 



I-l 

 LAMP 



Fig. 8 — Sequence chart for dielectric strength test circuit operation. 



