Filters
Power Filters
RF Filtersare designed to suppress/isolate RF signals travelling along power or signal lines.
Power Line RF Filters are available for power entry into RF shielded enclosures, isolation of secure power circuits (Red Power) and for protection against EMP/HEMP. Power Line RF Filters can be supplied for single phase (2 Line), DC (2 line) or three phase (3 or 4 line) applications for currents up to 4 kA and voltages up to 11 kV.
Ground Line Filters are available for isolated ground lines that are not connected to a buildings ground network. These are supplied in single line versions with a wide range of current capacities.
Signal Line Filters are available for signal/data cable entry into RF shielded enclosures. Signal Line Filters are available for a wide range of requirements including Video, Audio, DC, Ethernet, RS232, Fire, HVAC, Access control etc. Depending on the specific configuration the Signal Line Filters may have from 1 to 20 or individual lines.
RF Shielded Enclosure Filters (CEP)
Filters for RF shielded enclosures are generally fitted with a rear mounted penetration, which protrudes through the wall/ceiling of the RF enclosure. The rear face of the filter makes a contact seal with the outer surface of the RF shielded enclosure by compressing a mesh RF gasket in between. In some circumstances (eg when installing through a concrete wall next to the RF shielded enclosure) the mesh RF gasket is relocated between the filter penetrations securing nut & washer and the inside surface of the RF shielded enclosure.
Mains Filters (CEP)
FILTER RANGE
Our specialised range of (CEP) RF Shielded Enclosure filterscome in a range of performance, wiring and finish variants:
- PERFORMANCE
A series: ≥100dB, 150 kHz to 40GHz
B series: ≥100dB, 100 kHz to 40GHz
C series: ≥100dB, 14 kHz to 40GHz
C-H series: ≥100dB, 10 kHz to 40GHz
(H version has improved differential mode characteristics hence has a 10 kHz starting frequency)
- WIRING
Available in two (2) wiring variants as shown in Figures 1 to 2 below.
- FINISH
Generally, all filters supplied come in a Nickel plate steel finish however a Stainless steel finish is also available.
a) Flying Lead (C5) – Cable attached at both ends of the filter with the output cable passing through a mounting penetration.
RF Shielded Enclosure Filters (Flying Leads)
b) Stud Mount (JCL) – has internal wiring mounting studs (per phase) and a mounitng penetration at one end of the filter.
(Access to the internal mounting studs is via a removeable access cover plate)
RF Shielded Enclosure Filters (JCL)
Ground Filters (CEG)
Just like power lines, ground wires connect the entire facility together. All human-reachable surfaces of electrical equipment must be at ground potential for safety reason. While safety practices are always a good idea, a side effect of such connections is that if one piece of equipment injects noise into ground for whatever reason (miswiring, improper design, poor maintenance, etc.), this noise propagates throughout the facility and enters other equipment. Ground filters are capable of reducing this noise while maintaining all safety practices.
If you are concerned about noise in your environment, ground filters are a good way to mitigate the problem.
Ground Filters
Signal Filters (CES)
Theses filters are specifically designed to use of data, fire detection, video/audio signals and AC/DC switch signal with a rated current between 0.3 A and 1 A. These filters comply with military class C & D for shielded enclosures and anechoic chambers.
Signal Filters (CES)
Power Isolation Filters (CEPI)
Power Isolation Filters are required to separate or isolate secure power circuits (Red Power) from insecure power (Black Power) in defence and government installations. Power Isolation Filters are not typically installed onto an RF shielded enclosure and therefore do not require a penetration at the rear. Depending on the versions.Power Isolation Filters can be supplied with flying lead or bus bar connection, or with an enclosure protecting the connection terminals.
Figure 1. Internal Stud mount (JCL)
Figure 2. Flying Leads (C5)
Figure 3. Bus Bars Termination (/60)
Power Isolation Filters (CEPI)
EMP Protection Filters (CEP-EMP)
EMP Filters are designed to protect facilities and electrical infrastructure from damage associated with high voltage surges associated with lightning strikes or EMP/HEMP events.
The circuit designs of the filters are individual discrete lines for full performance in both common and differential modes. The performance is maintained under all current loading conditions across the full frequency spectrum, and the discrete line construction makes the filters fully electrically versatile in respect of connecting to the power supply. The mechanical design of the filters allows them to be installed either outside or inside of an EMP/HEMP protected area. The surge arrestors fitted to the filters makes them suitable for electrical circuits also protecting against the effects of secondary lightning. EMP Filters can also be supplied fitted with replaceable surge protection modules if required.