Another tip: Probing high-frequency signals, especially when there are nearby sources of electromagnetic energy, is tricky. There are several good articles online, depending upon the type of probe you use. If you're lucky (I'm not...) you'll have a differential probe. Otherwise, a 10X probe is a must.
BEWARE of ground leads on probes! They will pickup noise. The best solution I found is to remove the ground clip and the plastic probe shield, which should expose the metal ground connection on the probe. Tightly wrap bare-wire around the ground shroud, then solder to the nearest circuit-ground. I was able to reduce the ground connection length from 6 inches to less than 1/4 inch, and it made a big difference. For the signal connection, I used bare wire-wrap wire, wrapped a few turns on the probe-tip, then soldered to the component being probed. The length was around 1/2 inch. Yes, it's a pain, but there's nothing worse than spending (wasting!) weeks chasing-down a suspected noise problem only to find out you created it with improper measurement techniques. Also be careful of non-obvious ground loops. The signal ground of your scope is likely to be connected to the AC power-line ground. If your circuit ground is connected to the AC line ground (either directly or through your power supply), you will likely have aground loop, and that will add noise. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/189081be-4cb8-489e-a216-f9838b9bc8ea%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
