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6.3
Set chart speed at 0.5 inch/second. Turn on the recorder. Turn meter switch to
plus or minus, depending on charge to be applied. Move "operate" switch to
position and then close charging switch to apply 5kV to test specimen.
6.4
When the meter needle stops rising, indicating the specimen has received its
maximum charge, close the ground switch to remove the charge.
6.5
When the needle reaches zero or after ten seconds, whichever comes first, stop
recorder and move operate switch to zero.
6.6
Charge each specimen three times for both positive or negative charges, allowing
specimen to remain grounded for ten minutes after each charging cycle to
remove any residual charge on the specimen.
6.7
Calculate charge decay time by measuring the horizontal distance on the chart
from the point where the specimen was grounded to the point where the needle
reached zero. With the speed of the chart known, calculate the decay time for
each specimen.
7.0
Report
7.1
Report the facts pertinent to the test.
7.1.1
7.1.2
7.1.3
Notes
8.0
8.1
The purpose of this procedure is to evaluate the electrostatic buildup and
dissipation properties of packaging materials used to fabricate enclosures
primarily for missile components subjected, in a small degree, to direct climatic
exposure.
formulated to prevent the buildup or retention of electrostatic potential under any
atmospheric conditions, the objective being to maximize explosive safety and to
preclude ignition of stray flammable materials by electrostatic discharge.
State that the test was conducted in accordance with this procedure or
describe any deviations.
Identify the specimen and specific material tested.
Results of test.
7.1.3.1
State the decay time for each specimen for both positive and
negative charges, as calculated in 6.7.
7.1.3.2
State that material was tested as received, aged and exposed
to shower.
The test is particularly applicable to barrier materials especially
FED. TEST METHOD STD. NO. 3010
32
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