System 83 Ballistics Instrumentation
The System 83 measures chamber pressure by accepting a 0 - 10 volt signal from an external charge amplifier and transducer. This signal is digitized (10 bit accuracy) at 20 microsecond intervals. The pressure curve is displayed on the computer screen immediately after a shot is fired, and digital readings are provided for peak pressure, area under pressure-time curve, and rise-time. The displayed pressure curve can be chosen to be either 2 or 4 milliseconds in duration. Curves are stored for subsequent printout.
Alternatively, the System 83 measures chamber pressure using a small strain gage glued over the chamber area of a barrel. No transducer mounting holes are required, but bluing or other finish will likely be marred by the strain gage installation. The dimensions of the barrel and the assumed material characteristics are used to provide a scale for the pressure/time curves.
The system accommodates either two or three screens located near the muzzle. With two screens the system displays instrumental velocity between the two screens. The third screen must be located at the midpoint between the other two. The "proof" channel displays the difference in velocity computed between first and middle screens referenced to the velocity computed between first and last screens. The system can handle three additional downrange screens to measure terminal velocity, time-of-flight, and ballistic coefficient.
Machine Gun Rate-of-Fire
The System 83 measures the rate-of-fire and the velocity of individual rounds in burst fire. It captures the data from each round of a 30-round burst, at up to 2,000 shots per minute.
Acoustic Target Option
Instead of using the downrange screens, the ACOUSTIC TARGET may be used for bullets with a remaining velocity of greater than 1500 fps at the target. Four acoustic sensors record the bullet's passage and the system displays the exact hit location on the target, time-of-flight, ballistic coefficient, and the velocity at the target.
System 83 Unit
The metal case is 17" wide x 8" deep x 1.75" high, and can be fitted with ears for mounting in a standard 19" rack. The System 83 connects to the PC via 9-pin RS-232.
The computer furnished by the user must run Windows 95/98/ME/NT/2000,Vista or 7. It must have a 9-pin serial port or an IOGear USB to Serial Adapter to connect to the Model 83.
Model 57 Infrared Photoelectric Screens
The System 83 is commonly used with Model 57 infrared screens. Output pulse is +12 volts, approximately 2 milliseconds duration. M57 screens function with all projectiles larger than .17 caliber and faster than 300 fps.
Click here to download System 83 Brochure in .pdf format.