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The last mode on the menu is called AC THRESHOLD. This is not exactly a mode but rather a setting that works together with the PEAK TO PEAK mode. When AC THRESHOLD is selected you will see a voltage number displayed. Tapping the left selection button will scroll through the available settings: 50.0, 10.0, 5.0, 2.0, 1.0, 0.5, and 0.2. This voltage setting will allow the probe to automatically switch from DC meter to Peak to Peak when the probe tip senses any AC voltage that exceeds the voltage number selected from the AC THRESHOLD. It will also activate the speaker function, so you can literally hear the signal from the probe speaker.

 

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