問題：
DPO4000/MSO4000: In the Trigger menu when I select Type Rise/Fall time and then Thresholds the Set to TTL selection is grayed out?
答案：
The Set to TTL selection is depended on the vertical Volts/Division setting. From 1.00 mV/Division to 200 mV/Division the Set to TTL selection is grayed out. From 500 mV/Division to 10.0 V/Division the set to TTL selection will not be grayed out.
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常見問答集 ID 63431
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