The submarine depth sensor is a 2000-ohm potentiometer-type pressure gage. It is 

 designed for a pressure range of 14.7 to 457.7 psia, which is equivalent to a seawater depth 

 range of to 1000 feet. The pressure gage, fitted inside a watertight housing with the pres- 

 sure orifice open to the sea, is mounted to the cable-winching assembly in the BIAS buoy 

 nest. Leads from this sensor also are direct wired to the data center control unit. 



The submarine speed signal is provided from the ship's electromagnetic log via a synchro- 

 potentiometer circuit aboard the submarine. 



Data Center Instrumentation 



The instrumentation used for obtaining recorded data during buoy evaluation trials 

 consists of six units: 



1. A data center control unit of DTNSRDC design. 



2. A four-channel frequency-modulated (FM) discriminator unit Defense Electronics, 

 Inc.. Model SCD-1 1 .' 



3. A 6-channel to 3-channel analog multiplexer of DTNSRDC design. 



4. A 6-channel strip-chart recorder. Brush Mark 260." 



5. A 36-volt d-c, one-ampere power supply. Kepco Model SC-36-lM.^ 



6. A 60-volt d-c, 500-milliampere power supply, Kepco Model CK60-0.5M.'' 



The data center control unit serves as a distribution terminal for system power and data 

 input-output signals. It also contains the signal -conditioning electronics and calibration cir- 

 cuitry for the shipboard sensors and contains the d-c servo amplifier along with signal- 

 conditioning electronics for the amplifier inputs. The switches and potentiometer controls 

 for the depth-keeping system and a pushbutton for measurement calibrations are located on 

 the front panel of this unit. 



The FM discriminator unit is used to demodulate the four telemetered buoy sensor 

 signals. Three of the analog output signals (buoy pitch, shallow depth and stabilizer angle) 

 are input to the control unit for use with the depth-keeping servo. These same signals from 

 the discriminator, plus the buoy deep-depth signal also are connected to four input channels 

 of the analog time-sharing multiplexer for ultimate recording on two channels of the strip- 

 chart recorder. 



Instruction Manual, Model SCD-1 1 Subcarrier Discriminator." Defense Electronics. Inc., RockviUe, Maryland (1970). 

 A complete listing of references is given on page 34. 



Operating Instructions, Mark 260 Recorder," Gould, Inc., Qeveland, Ohio (1971). 



Kepco Instruction Manual, Model SC-36-1M, Voltage Regulated Power Supply," Kepco. Inc.. Flushing. New York 

 (1958). 



'* "Instruction Manual, Model CK60-0.5M, Regulated DC Supply," Kepco, Inc., Flushing, New York (1967). 



