問題：
On the TDS200 series what's the little arrow at the top of the graticule?
答案：
It indicates horizontal position (i.e. trigger position) and is coupled with a numeric readout above the graticule:
0.00 = center screen (mid record).
Horizontal position is read out in + or – time with respect to the center screen.
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常見問答集 ID 57626
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