The Fischer Custom Communications, Inc. Common Mode Impedance Stabilization Network - Common Mode ISN - (F-CMISN-CAT5) is used to provide a common mode impedance in support of conducted emissions testing of Information Technology Equipment (ITE) as per CISPR 22. This passive device provides a true broadband common mode impedance that is well defined with respect to the reference ground plane over the CISPR 22 frequency range of 150 kHz to 30 MHz. When used in conjunction with a FCC F-43 Current Probe and a FCC F-CVP-1 Capacitive Voltage Probe, very accurate common mode current and voltage emission measurements can be made as per CISPR 22 (Annex C.1.3).
Use of this device eliminates the need for the time consuming positioning of ferrites on the cable under test to effect the desired common mode impedance (CISPR 22 Annex C.1.4). The ferrites must be re-positioned for every emission frequency to obtain the desired common mode impedance. In certain cases, the ferrite approach will not be able to obtain the desired impedance.
The F-CMISN-CAT5 is equipped with RJ-45 telecom connectors suitable for direct connection to Category 5 cables. Adaptors allow a variety of standard 2, 4, 6, and 8 wire ITE conventions to be used with this device.
