AUTOMATIC MACHINE FOR TESTING CAPACITORS AND NETWORKS 1195 



Note: The capacitance decade box for Test No. 2 is not shown in Fig. 

 11. Also, only the segments for M2 Test No. 2 microfarad meter are 

 sliown. 



If capacitor units No. 1 and No. 2 under test are acceptable product, 

 the pointer on the microfarad meters Ml and M2 will both swing to 

 segment "A". The cammed switch S7 will close and energize the relay 

 on the microfarad meters (not shown on meter M2) which will operate 

 the meter contactor and close the circuit through segments "A" of meters 

 Ml and M2 and apply 24 volts dc to close and lock the "less than maxi- 

 mum" memory relay K12. 



The cammed switch S7 is opened to release the meter pointer from 

 segments "A" on Ml and M2. Cammed swdtch S8 is opened momen- 

 tarily to release relay K14 which removes the test voltage from the 

 capacitors on test and from meter Ml and M2. During this interval 

 cammed switch Sll is closed to energize relay K16 which connects the 

 "greater than minimum" capacitance box C3 in series with capacitor 

 unit No. 1 on test and meter Ml. In a like manner a second "greater 

 than minimum" capacitance decade box (not shown on Fig. 10) is con- 

 nected in series with capacitor unit No. 2 and microfarad meter No. 2. 

 If the capacitor units No. 1 and No. 2 under test are acceptable product, 

 the microfarad meter pointers will swing to segments "B". The cammed 

 switch S7 will close and energize the relay on the microfarad meters Ml 

 and M2 which will operate the contactor that depresses the Ml and M2 

 meter pointers against segments B and closes and locks the "greater than 

 minimum" memory relay K13. With relays K12 and K13 closed as 

 described above, the cammed switch S6 is closed which operates the 

 acceptance solenoid K17 through the "A" contacts on relays K12 and 

 K13 to accept the dual unit capacitor under test. 



It may be readily observed that in case either or both of the capacitor 

 units on test are out of limits, the circuit will not close either or both 

 relays K12 and K13, w'hich would leave the acceptance solenoid K17 

 circuit open, and the product would be rejected. 



B. Capacitance Test of Single Unit Capacitors or Networks 



The capacitance test of single unit capacitors is the same as for dual 

 unit capacitors, except test No. 2 circuit and test No. 2 microfarad 

 meter M2 are not used. Test No. 2 cutout relay K15 is closed to apply 

 ground to its contacts B and D. 



