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Page Title:
Electrical Circuit and Continuity Test (see 4.3.3.1) |
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|  MIL-I-60476A(MI)
4.4.1 Electrical Circuit and Continuity Test (see 4.3.3.1). The
e actrical circuit of the igniter between the lead wires shall be
continuous and shall be within the resistance limits of 0.70 ohms and
1.30 ohms inclusive. The equipment used in measuring the igniter
electrical continuity and resistance shall not subject the igniter
firing circuit to more than 25 (twenty-five) milliamperes,
4.4.2 Insulation Breakdown Test (see 4.3.3.2). The resistance
between the connected lead wires, and any portion of the bare metal
exposed on the igniter case or cover, shall not be less than 50,000 ohms.
*
4.4.3 Vibration Test (see 4.3.3.3)_. All sample igniters shall be
secured in suitable fixtures and subjected to a vibration of 2200
(twenty-two hundred) cycles per minute (CPM) for (40) forty minutes
using a vertical amplitude of .031 inch .002 inch (0,7874 mm O.0508 mm)
peak-to-peak. After vibration, the electrical resistance and Insulation
breakdown resistance of each igniter shall be measured and recorded.
For the purpose of testing and identifying the igniters for use in
subsequent testing, the igniter shall be positioned and tested as
follows:
IGNITER FUNCTIONING (see 4.3.3.5)
61-70
1-10
31-40
Axis Vertical- Insulated Terminal Down
41-50
71-80
11-20
Axis Vertical- Insulated Terminal Up
21-30
51-60
81-90
Axis horizontal-Insulated Terminal Up
4.4.4 Airtightness Test (see 4.3.3.4). This test consists of
Placing the igniters in a pressure vessel connected to a source of
Controlled air, water, or similar medium, and controlled to decrease
the pressure at the igniter by 5 pounds per square inch (psi) (3,515.7 kg/
2
meter (m) ) when submerged In water. The air space above the water shall
be evacuated by ap roximately 5 psi (3,515.7 kg/m2) below ambient for a
minimum time of (5) five seconds. A wetting agent is permitted to lessen
the adhesion of bubbles to the igniters. All such bubbles shall be
eliminated before applying pressure, and assessing the igniters under
test. A formation of bubbles on the igniter surface, or a steady flow
of bubbles indicate air leakage. There shall be no evidence that water
has entered the igniters. The igniters must be safe and operable follow-
ing this test, and must be thoroughly dried for use in subsequent testing
(see 4.4.5).
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