fig1 there are a series of five break screens 10 all spaced a predetermined distance d apart by shooting the projectile 14 through a series of break screens 10 set up along the full length of the underwater firing range the test engineers can measure the time interval between the opening of consecutive screens 10 in order to measure velocity of the projectile 14 as well as a position of the projectile 14 during the run the velocity of the projectile 14 is ultimately found by measuring the travel time t 2 u2212 t 1 between two consecutive break screens 10 separated by a distance d by recording the speed and position of the projectile 14 over the entire length of the underwater firing range valuable acceleration and deceleration data is obtained during the course of the test due to data acquisition channel limitations and large number of break screens 10 a method was required to provide the speed and position data for the entire run over a single channel referring now more particularly to fig2 it will be understood that the sensing and control circuitry processes the state of the plurality of break screens 10 and the following describes the circuit that was designed to accomplish this goal the circuitry described herein is able to receive and condition signals received from at least twelve break screens 10 evenly spaced in the underwater firing range the resistance of each of the break screens 10 is approximately 1 kohm before being broken by the projectile 14 and the resistance increases by a few orders of magnitude after being punctured if the break screen 10 were in air the resistance would be infinite open circuit but in water the resistance is.