Triax ASTM F1292 User Manual page 22

The user may optionally configure the Triax Touch to display the HIC interval which the Triax
Touch display calls "Delta" Delta refers to the difference in milliseconds (or delta) between the t1
and t2 integration limits of the HIC interval.
NOTE: At any time while the Triax Touch is preparing for a drop test, the test can be canceled by
pressing the GO BACK key. The test will be canceled without changing any test results previously
saved in the Triax Touch memory.
6.2 Daily System Verification
Before performing drop tests the Triax Touch must be tested to ensure that the system is
functioning properly, as required by the applicable specifications. This test is performed by
dropping the missile on a reference pad, which was supplied with the system. Appendix A details
the procedure for this test. The test should be performed on a daily basis before starting surface
tests. Not performing the prior to use test could render field data invalid if the subsequent
verification test shows a non-compliance issue.
NOTE: Most standards require the verification procedure to be performed within 24 hours of
performing surface testing. Refer to the applicable standards for exact requirements.
6.3 Inspection of test result
Before continuing with the next drop test, the operator should briefly review the current test to
detect any obvious problems with the data.
6.4 Verify impact velocity
Compare the impact velocity as calculated to the theoretical velocity for the respective drop height.
If impact velocity is not within limits, repeat the drop test.
The theoretical velocity may be calculated from the measured drop height:
Using Imperial units:
Velocity = 8.025 * square root (drop height)
Where the velocity is in feet per second (ft/sec) and the drop height is in feet
Using Metric units:
Velocity = 44.27 * square root (drop height)
Where velocity is in centimeters per second (cm/sec) and drop height is in centimeters
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