For a current injection probe (or inductive clamp), the Insertion Loss = 20 log (Vout/Vin), where Vout is the voltage obtained at the connector of the probe, and Vin is the voltage applied through the cable/conductor being clamped by the probe. The insertion loss values can be given by the manufacturer of the probe, or can be measured in a 50 Ohm env., with a calibration jig, a generator, and a measuring set (scope, SA, RF voltmeter) - for the calibration jig, see Annex A of EN61000-4-6. The probe is usually reversible and can be used for either inducing RF fields in cables, or measuring conducted disturbance. Another useful parameter is the Transfer Impedance of the probe, which can be measured, or calculated function of the Insertion Loss.
Hope it helps. Alexandru Guidea. From: Luke Turnbull [mailto:[email protected]] Sent: Wednesday, August 20, 2003 3:05 AM To: [email protected] Subject: Insertion loss of an injection probe Dear group, I have a BCI testing standard that states the insertion loss of an injection probe must be less than 7dB. Does anyone have an idea about what they mean by the insertion loss? Thanks, Luke Turnbull This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
