5-24 Model 2790 SourceMeter® Switch System User’s ManualHIPOT testThis test is used to measure the leakage resistance between an initiator (bridgewire) andthe housing.Single stage inflator connections to the 7751/7753 module is shown in Figure 5-3, whiledual 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 circuitThe circuit for the HIPOT test is shown in Figure 5-12.Internal shunts — The HIPOT test is usually performed with the shunt bar installed. Thisshorts the bridgewire to prevent accidental ignition of the inflator. However, if the shortbar is not installed or should it become defective, the protection is gone. Therefore, the7751, 7752, and 7753 provide built-in shunts. They can be used in lieu of, or with theshunt bars to provide additional safety. As shown in Figure 5-12, closing channel 3 or 6connects 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.
