Is the bode plot easy to get ?

I can only speak for process plants, but there the answer is *no*. For all sorts of reasons, some technical, some organisational.

snipped-for-privacy@i18g2000pro.googlegroups.com...

On the other hand, if you're working on a product in a lab then getting a frequency response sweep is often quite easy. Usually just a few sweeps will do to get your initial data, although you'll find yourself doing multiple sweeps as details change. If you have a resonance then either do the entire sweep with a very small frequency step, or do a sweep right around the resonance to pick up the detail.

But Bruce is correct -- doing a frequency sweep on an entire oil refinery is a bit of a stretch, particularly when you're using expensive raw ingredients to produce out-of-spec crap that has to be thrown away as hazardous waste. Ditto for same on a new jet airliner.

Got it! Thanks for all=EF=BC=81