The main application is performing engine relative compression tests by observing the AC pulsations of the cranking current with a current clamp. You can also view the rectified voltage pulsations of the car alternator.
AC coupling is very useful in the car diagnostics because it lets you see in-depth certain part of mixed (AC and DC) signals.
The most common automotive applications of the AC coupling adapter, are:
- perform relative compression tests by measuring the engine cranking current with a current clamp;
- view the rectified voltage pulsations of the car alternator.