Oehler Research · Ballistic Measurement Systems
Oehler System 84
A shotshell-only chamber pressure and velocity system that uses velocity coils to solve the problem of measuring a shot cloud that no photoelectric screen can time.
The basic difficulty in shotshell testing is that the gun fires a cloud of pellets, not a single bullet. A photoelectric screen triggers on whichever pellet arrives first, and that number has no physical meaning. System 84 uses velocity coils instead: the whole signal from the cloud passing through a coil is digitized into a density curve, the center of mass is located at each measurement point, and the velocity computed from it represents the entire charge. It succeeds the Model 71 and replaces that model's manual tuning with automatic tuning. It works with lead and steel shot but not with tungsten-matrix shot or pellets bound in an insulating buffer. Oehler restricts the international export of this system, and supply is assessed case by case.
Overview
System 84 exists for shotshell testing and, in the factory's own words, for nothing else. Velocity coils take the place of photoelectric screens. As the shot cloud passes through a coil, the coil signal is digitized into a density curve and the software locates the cloud's center of mass on it. The center-of-mass displacement and time difference between two coils give a shot velocity that is physically meaningful and repeatable. The pressure curve and the coil response are displayed together with trigger points marked, so a bad measurement is easy to spot. Earlier equipment needed manual tuning; System 84 tunes itself. The oscillator is a separate module connected over RG-58 coax. The interface is RS-232, the operating system is Windows 2000 Pro or Windows XP Pro, and data is written in a dBase-compatible format with support for networked multi-station work. Mind the material limit: lead and steel shot are fine, tungsten-matrix shot and pellets embedded in an insulating binder are not.
Key specifications
| Dedicated use | Shotshell chamber pressure and muzzle velocity (successor to the Model 71) |
|---|---|
| Measurement method | Velocity coils, not photoelectric screens |
| Velocity algorithm | Coil transit signal digitized into a density curve; velocity of the shot cloud's center of mass |
| Tuning | Automatic tuning (replaces the manual tuning of earlier models) |
| Oscillator | Separate module, connected over RG-58 coax |
| Interface | RS-232; operating system Windows 2000 Pro / Windows XP Pro |
| Database | dBase-compatible output, network operation supported |
| Material limits | Lead and steel shot; not tungsten-matrix shot or pellets in an insulating binder |
Features
Coil measurement solves shot-cloud velocity
A screen fires on the first pellet to arrive; a coil sees the whole cloud, so the number stands for this shell.
Center-of-mass velocity from a density curve
Velocity is computed from the displacement of the cloud's center of mass, which is physically meaningful and repeats shot to shot.
Automatic tuning
Removes the manual tuning of earlier models; the operator needs no coil-tuning experience.
Pressure and coil curves displayed together
Both traces sit side by side with trigger points marked, so a faulty measurement is obvious.
dBase-compatible, network capable
Data from several stations collects in one place, which suits multi-position production lines.
Method and applications
Coil measurement · COILS
Velocity coils in place of screens
The shot cloud passing through a coil produces a continuous signal; digitized into a density curve, its center of mass gives a velocity for the whole charge.
Quality control · QA
Ammunition production QC
Lot sampling and type approval need a repeatable measurement baseline; shot-by-shot archiving supports long-term trend tracking and traceability.
Laboratory
Ballistic laboratory
Chamber pressure, velocity and consistency measurement in indoor tunnels and labs, where data must flow straight into statistical analysis and QC reporting.
R&D
Development and load validation
Comparing loads, bullet shapes and barrel conditions only works when the system's own uncertainty is far smaller than the differences under test.
Options and configuration
System 84 is a system-class product and Oehler restricts its international export. Send us your requirement first; Evencat will obtain a supply assessment and lead time from the factory.
Standard equipment (included)
Options and extensions
Service and support
Downloads
This product is a ballistic measurement system. Oehler restricts its international export and a US export license may be required. Evencat can submit an export assessment to the factory and obtain a supply and lead-time reply. Evencat supplies and quotes Oehler Research, Inc. (Austin, Texas, USA) products in Taiwan, with model selection advice, supply assessment and training.
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