INTRODUCTION TO SONAR 



test values are inserted manually, and the problem 

 is stopped at a fixed point. Input test quantities 

 are thus of a constant value and produce fixed 

 answers, which do not change with time. These 

 fixed answers indicate whether the static portion 

 of the fire control equipment is performing 

 properly. 



• Dynamic tests: Dynamic tests are run to 

 check the computer's generation of bearing and 

 range for specified time intervals against a 

 mathematical solution whose answer contains 

 correct amounts of change in quantities for like 

 conditions. During the test, fixed values are 



assigned to relative motion rates by manually 

 setting inputs to the relative motion group. The 

 time system of the computer is tlien moved, 

 either manually or by the time motor, an amount 

 equal to the test interval. Readings are then 

 taken to ensure correctness of the solution. 



Rate Tests 



Rate control tests clieck the functioning of 

 the rate control system. Mechanisms of this 

 system correct values, such as target angle 

 and target speed, so that computer target motion 

 rates agree with actual rates of the target. In 



range rate 

 scale 



fciillM lllWlllMI 



firing index 



stem scole 



bow scole 



firing log scale 



bocking plote scale 



effective range 

 (Re) scale 



horizontal 

 slide knob 



vertical slide crank 



51.85 

 Figure 7-16.— Tactical range recorder. 



126 



