I have just had an interesting experience of having some severe noise issues on a small micro controller.
In the end it was mains hum and a speed drive (located very close by) causing the hiccups.
Anyway I started wondering if there is a reasonable affordable way of doing some testing for EMC and RF issues.
Most of what I have found on the net is at the very wrong end of the cost scale, however I found this hand test tool at www.empulse.co.uk
Anyone got some real life experience in this field they would want to share and some suggestion for testing