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High-Pass Electrical Filters, BNC Feedthrough![]()
Application Idea EF507 Used in Conjunction with a High-Impedance Oscilloscope and Amplified Photodetector EF121 >10.2 kHz High-Pass Filter EF503 >220 kHz High-Pass Filter Related Items ![]() Please Wait ![]() Click to Enlarge Figure 1: Each EF100 Series in-line filter features two female BNC connectors. They are engraved with the part number, the type of filter, the passband range, and the response curve.
![]() Click to Enlarge Figure 2: Each EF500 Series coaxial filter has a male and female BNC connector. They are engraved with the part number, the type of filter, the passband range, and the response curve. Features
Thorlabs' Passive Electrical Filters are feedthrough BNC filters that allow the user to filter unwanted signals and noise with a guaranteed minimum rejection of 40 dB. These high-pass filters are designed to be driven by a low-impedance source and terminated directly into high-impedance equipment. Examples of typical 50 Ω (low-impedance) sources are Thorlabs' amplified photodetectors, while examples of high-impedance equipment include 1 MΩ oscilloscope terminals, DAQ boards, and 100 kΩ op-amp inputs. This page contains our series of high-pass electrical filters. Thorlabs also offers low-pass electrical filters and DC block electrical filters. These are passive filters; therefore, no power supply is needed to run these devices. Additionally, they will not display any of the intermodulation distortions that are often observed when using active filters. Passive filters also have lower noise floors and lower thermal emission than their active counterparts, giving these filters higher signal-to-noise capabilities. Each filter is engraved with the part number, passband range, input/output impedance values, and a frequency response curve. High-Order Elliptic Filters Elliptic filters, also known as Cauer filters, produce some of the steepest signal attenuations before the passband when compared to most other passive filters (see the tables below for the filter's frequency response). This property ensures that these filters are well suited for applications that require severe attenuation of stopband frequencies close to the passband. In-Line and Coaxial Package Designs
![]() The in-line package of these filters offers two female BNC connectors.
![]() The coaxial package of these filters offers one male and one female BNC connector.
![]() Aluminum Clamps, Post Mountable Each clamp has a #8 (M4) counterbore on the bottom, allowing it to be mounted on a Ø1/2" post or any surface with an 8-32 (M4) tap. The clamp must be mounted via the counterbore before the device is attached, as the counterbore will not be accessible once the housing is secured in the clamp. Plastic Clamp, Double Sided | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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