5
Inflator Testing
• Introduction — Summarizes the tests used for airbag inflators and provides notes
that apply to most tests.
• Test system — Shows a typical system connection using a programmable logic
controller (PLC) and a PC.
• Test signal connections — The four basic system test connection schemes for
inflator testing.
• Interlock — Covers interlock, which is used to disconnect the sources of the 7751,
7752, and 7753 modules from the switch matrix.
• Shunt bar test — Provides the test circuit and procedure to measure the resistance
of a shunt bar.
• Bridgewire tests — Provides the test circuit and procedure to measure bridgewire
resistance of an inflator.
• Insulation resistance (HIPOT) tests (7751/7753 only) — Provides the test cir-
cuits and procedures to measure the insulation resistance of an inflator. Summa-
rizes cable discharge. Includes tests for contact checks for high voltage connections
and V-source readback verification.
• I-source readback — Shows how to use the I-source readback circuit to verify the
actual current flowing in the test circuit for bridgewire and shunt bar tests.
• Memory patterns test — Gives a test example using the memory patterns feature,
which can be used to simplify repetitive tests.
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