BENTHIC LABORATORY 



401 



compared to tJie two or three minutes required for inserting the faulty card in the top slot of 

 module II where visibility conditions were ideal (Fig. 163). The card was successfully inserted 

 and homed in place to full-pin contact by the manipulator and the A to D converter card rein- 

 stalled in the Sealab rack. The data transmission link was then found to be operating satis- 

 factorily. 



Fig. 163. Benthic laboratory manipu- 

 lator in position to engage top card in 

 module 1 1 



While the cause of the trouble in the A to D link was not conclusively determined, there 

 is a strong suggestion that a combination of electrical leakage in the connector in the Sealab 

 electronics rack, in conjunction with electrical damage to the diode gate card, were the cause 

 of trouble. The trouble was presumably corrected by both the replacement of the card and by 

 the removal of the plug from the chassis socket, thereby giving it an opportunity to dry out and 

 relieve the severity of the electrical leakage. Manipulation was secured at 2:30 p.m. 



