1184 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 195G 



The acceptance or rejection of a unit under test at any one of the six' 

 test positions depends on whether the test on the unit energizes the i 

 "acceptance" solenoid associated with that test position. The gripper 

 hook, which locks the unit under test in the contact fixture, is con- 

 nected to a release shaft, follower arm, and roller (see Fig. 3). The roller 

 rides in a track in which the plunger of each "acceptance" solenoid hes, 

 unless removed by energizing the solenoid from its associated test cir-i 

 cuit. In the case of a defective unit, the acceptance solenoid is not ener- ■ 

 gized and the roller in passing over the plunger of the "acceptance" » 

 solenoid trips the gripper hook and the spring loaded plunger in the 'H 

 contact fixture ejects the defective unit. Units that pass all tests are 

 ejected on a turntable to the left of the operator from which they are 

 stacked in handling trays by the operator. 



The turret assembly includes the test fixtures, the gripper hooks and 

 associated release shaft, follower arm and I'oller, and the brush assembly 



DIELECTRIC STRENGTH CONTROL 

 PANEL. 



RESISTANCE STANDARDS FOR 

 IMPEDANCE TEST CIRCUIT. 



SENSITROL RELAY FOR IMPEDANCE 

 TEST CIRCUIT. 



5 KILO-CYCLE OSCILLATOR. 



POWER SUPPLIES AND SWITCHING 

 PANELS. 



Fig. 5 — Control panels for dielectric strength and impedance tests. 



