Ambient light measurements are obtained from a single photocell 

 located in the transducer housing. Its output is amplified and modulated 

 in the same manner as the temperature subsystem. 



Wave heights are recorded from an Edo 255B transducer mounted 

 in the transducer housing. The distance to the surface is recorded 

 approximately every 0.6 second or less. Roll angle is recorded simul- 

 taneously with the wave data. When the submarine is hovering, these 

 data are adequate to allow spectral analysis of the wave heights. 



3. Recorders 



The scanner is a six-digit, six- channel stepping switch which 

 allows the digitized outputs of each sensor to pass in sequence to the 

 digital recorder or the tape punch coupler. Each channel is identified 

 by an indicator number at the left of each channel output. 



The digital recorder is operated by the scanner and provides a 

 printed record similar to a cash register receipt of all variables 

 sampled by the scanner. 



The paper tape punch is connected to the scanner by means of 

 the coupler. The function of the coupler is to convert the parallel data 

 from the scanner to the serial form required by the tape punch. The 

 tape punch and coupler operate directly from the scanner and cannot 

 be used at the same time as the digital recorder. The punched tape 

 format is compatible with the Burroughs 205 computer and the Flexo- 

 writer. 



The Flexowriter is an off-line component of the system and is 

 used for annotating the rolls of punched tape as to year, ship, and 

 other identifiers. It likewise will be used to reproduce punched tape 

 data for operational use by the ship personnel and for verification of 

 the correct operation of the tape punch unit. 



4. Procedures 



Outputs from the clock, calendar, and manual inputs are in 

 digital form and require no further digitizing. 



Depth and sound velocity signals, being in frequency form, are 

 digitized by variable time-base counters. Temperature and ambient 

 light signals are converted to frequency by a voltage-to-frequency 

 converter and then digitized by an electronic counter. 



C-5 



