/products/manufacturers/digilent/b/blog/posts/measuring-pmod-switching-speed-with-a-high-bandwidth-oscilloscopeDigilent recently introduced the ADP5470 and ADP5490, two new models in the Analog Discovery Pro 5000 Series. Both are four-channel mixed-signal oscilloscopes with significantly higher bandwidth and sample rates than previous models. To test their c.en-USTelligent Community 12https://community.element14.com/products/manufacturers/digilent/b/blog/posts/measuring-pmod-switching-speed-with-a-high-bandwidth-oscilloscopeFri, 31 Oct 2025 09:21:14 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:e625e329-2cf4-45c0-a718-e87e9198ffd7michaelkellett0<p>I&#39;m sure I&#39;ve seen an article very like this from some time ago. Then, as now, the experimental technique was quite inadequate and the information provided insufficient to determine the sources of error.</p> <p>It is not possible to accurately measure 100MHz+ signals with huge loops of earth wire to the scope probes.</p> <p>The article does not state what probes were used.</p> <p>The settings of the 5490 were not discussed.</p> <p>&nbsp;There is an error in your post:</p> <p><em>At 60 MHz, the signals still transitioned cleanly, but the waveform edges showed slower slew rates</em></p> <p>The slew rate is about the same at 10MHz and 60MHz but the effect on the waveform shape is 6x more significant at 60MHz - the original article explains this properly.</p> <p>There is a lot of information on the web about probing techniques for high speed signals. <a href="/members/shabaz" data-e14adj="t">Shabaz </a>has posted some low cost ideas on E14.</p> <p>MK</p><img src="https://community.element14.com/aggbug?PostID=29261&AppID=177&AppType=Weblog&ContentType=0" width="1" height="1">