ETS-Lindgren 7405 E & H Near Field Probe Set - Manual (Page 27)

www.ets-lindgren.com Common Diagnostic Techniques 27
6.0 Common Diagnostic Techniques
Before connecting any components, follow the
safety information in the ETS-Lindgren
Product Information Bulletin included with your
shipment.
Obtaining accurate, repeatable results from EMI testing requires a carefully
established and characterized test setup, usually an open field test site or a
shielded room. Final qualification must be performed in the required test
environment of a screen room or an open field site. However, a great deal of
preliminary EMI testing can be done with a sniffer probe and signal analyzing
instrument. The following sections describe how sniffer probes can be used in
various phases of the engineering task.
Locating Radiating Sources
The first step is to relate the emissions failure to signals used in the Equipment
Under Test (EUT) being tested. To do this an understanding of the nature of the
time domain to frequency domain transform is necessary.