probe tip performance is specified using a test fixture built with a probe tip having a signal wire length of 10 mils (.25 mm)
and a ground wire length of 66 mils (1.7 mm).
The typical pulse waveforms in the following figures show the effect of input wire length variation on measured responses.
Note that these measurements, in these images, were made using a 20 Ghz P7720 probe.
Figure 16: P77STFLXA solder tip attached with 10 mils (0.250 mm) wires (rise time = 30.5 ps)
Figure 17: P77STFLXA solder tip attached with 75 mils (1.90 mm) wires (rise time = 27.9 ps)
Theory of operation
TDP7700 Series TriMode™ Probes Technical Reference
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