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MacSema ButtonMemory, Contact Memory Buttons (CMB’s) have successfully completed
rigorous MIL-STD 810F environmental tests conducted by an independent third
party. MIL-STD 810F is a US Department of Defense standard for testing the
impact of environmental stress on material throughout all phases of its service
life.
Fourteen environmental tests were
selected from MIL-STD-810F and carried out on MacSema, Inc. ButtonMemory technology.
Three additional tests were also conducted; Shear/Impact, Magnetic Field and Gamma
radiation. The MIL-STD 810F test parameters were:
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In addition to the above noted MIL STD-810F tests, MacSema CMB's
have been exposed to a number of additional environmental tests conducted by independant third parties,
primarily customers. These tests
include:
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Thermal Shock: The cold zone of the
chamber was maintained at -54°C (-65°F); hot zone was set
for 160°C (320°F), 4 cycles were completed and all
buttons passed their operational check. BMA,
Model #TA-208CC Thermal Shock Chamber.
Ford Motor Company
uses 2K MiniButtons on an electrical assembly line that routinely
requires temperatures of 125° C (257°F).
Prior to Ford’s
acceptance of the technology they subjected the buttons to temperature shock of
–40°C (–40 °F), to 150°C
(302°F) in
30 minute increments for over 1500 cycles.
Temperature/Vibration: Temperature cycling from -65°C
(-85°F) to 135°C (275°F). A random vibration profile taken from
MIL-STD-810E representing vibration found in the fuselage area of a jet aircraft
was applied for 15 minutes at the low and high temperatures each cycle (10
cycles). Post op checks showed no apparent discrepancies. Tenny Mfg. Combined
Environmental Chamber Model #AG-64CAS and Lingo, model #V860 vibration shaker.
High Temperature: Buttons were exposed to 177°C
(350°F), 204°C (400°F) and
232°C (450°F) for
15 minutes duration, cooled and operationally checked at each temperature
increment. At 350° F and (400°
F), all minibuttons passed functionality. Grieve Corp. Model #520 Console Oven. Buttons were satisfactorily tested at the Yuma Proving Grounds
on an M1 Tank engine (Allied Signal AGT 1500 Gas Turbine) to temperatures above
177°C (350 F). The testing covered 214 hours of vehicle operation. As a result of this
evaluation, Honeywell Engines and Systems "determined that MacSema, Inc.
32K mini-button is a viable solution for accurately and reliably tracking major
components of the AGT1500 gas turbine engine."
EMP: 5.8, 26.7 and 55.0 kV/m.
ESD: 15 kV, 20 pulses per second, human model
EMI:
Buttons were tested in a VARIAN Magnetic field generator, Model # V-3800. In
this test the ButtonMemory® technology products were exposed to a 8000-Gauss
magnetic flux density field without losing the data stored in memory. Details are available if required.
No degradation when exposed to electric field strengths of 200
Volts/meter over the frequency ranges of 2.0 MHz to 4.0 GHz, as well as 18.5 to
19.5 GHz. Presently Button Memories are classified as not susceptible to RF
signals of 200 Volts/meter Continuous Wave (CW) over the frequency of 2.0 MHz to
4.0 MHz and 18.5 GHz to 19.5 GHz. The various RF Probes, RF monitors, signal generators, RF
amplifiers and antennas utilized for the EMI test were manufactured by Amplifier
Research, Narda, H.P. Logimetrics, Varian EMCO and Electro-Metrics.
Gamma Radiation: Irradiated CMBs in the 60Co Irradiator
to the highest non-failure dose and tested for function. The maximum gamma
radiation levels(in Krad) that each CMB category was able to withstand are
as follows: Mini, 75.0 Krad, Micro, 205.0 Krad.
Shear/Impact: The
objective of
this test was to assess the integrity of the CMBs and the strength of the epoxy
after these were exposed to shear and impact forces. When affixed with epoxies
Hysol EA 9394 and Hysol EA 9359.3 the flanged CMBs were able to withstand
several impacts with shear loads of up to 15lb.
Acid Bath: Buttons were subjected to a 30% phosphoric acid bath to
etch prior to painting and passed.
Paint Removal: Buttons have been painted, chipped by hammer,
read/updated and performed normally. Buttons have been blasted with glass
beads and aluminum hydroxide at 80 psi and performed normally.
Salt Water : Submerged in saltwater for over a month.
Gunfire : April 2000. Buttons were bonded to HK33 5.56mm Assault Rifle
in close proximity to the barrel extension. 10,000 rounds were fired from the
shoulder in series of 200 (fired in three minutes with a mixture of single
shot and full auto). At the end of each series, the weapon was immersed in cold
water to rapid cool. No failures.
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