Hello,<br>
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While the P6100 isn't the best probe to use with the TDS524A due to the probe's compensation range being 10-35pf and the TDS's input capacitance being at the edge of its range 10pf.  There should still be a signal, but it will appear distorted. <br>
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In this case the probe compensation port might be non functional.  If possible, consider using a second known good oscilloscope to measure your TDS524A's compensation test point.