5-24 Model 2790 SourceMeter
®
Switch System User’s Manual
HIPOT test
This test is used to measure the leakage resistance between an initiator (bridgewire) and
the housing.
Single stage inflator connections to the 7751/7753 module is shown in Figure 5-3, while
dual stage inflator connections are shown in Figure 5-5.
NOTE The interlock of the 7751/7753 must be enabled in order to use the V-source.
Figure 5-6 shows how interlock is enabled.
Test circuit
The circuit for the HIPOT test is shown in Figure 5-12.
Internal shunts — The HIPOT test is usually performed with the shunt bar installed. This
shorts the bridgewire to prevent accidental ignition of the inflator. However, if the short
bar is not installed or should it become defective, the protection is gone. Therefore, the
7751, 7752, and 7753 provide built-in shunts. They can be used in lieu of, or with the
shunt bars to provide additional safety. As shown in Figure 5-12, closing channel 3 or 6
connects the internal shunt across the bridgewire.
Single stage inflator — Closing input channel 1 connects the first bridgewire.
Dual stage inflator — Closing input channel 4 connects the second bridgewire.
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