问题：
Can the WFM90 series handheld waveform monitor view RF modulated video signals?
答案：
No. The WFM90, 91, 90D and 91D only operate with baseband composite analog (or in the "D" models, SD-SDI also) video. If you connect an RF modulated signal to the input the instrument will simply read a "Loss of Sync" error.
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常见问题 ID 63311
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