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购买 Test Relay Circuit
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Universal 12V/24V Automotive Relay Tester Automotive Relay Short Circuit Tester Auto Battery Checker Electronic Relay Tester
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8:37
wikiHow
Ricardo Mitchell
How to Test a Relay
Relays are discrete devices (as opposed to integrated circuits) that are used to allow a low power logic signal to control a much higher power circuit. The relay isolates the high power circuit, helping to protect the lower power circuit...
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