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High-Pass Electrical Filters, BNC Feedthrough


  • Passive High-Pass Electrical Filters
  • Rejection: 40 dB Minimum, 60 dB Typical
  • Terminates Directly into High-Impedance Test Equipment
  • 1 dB Cutoff Frequencies Available from 1.2 kHz to 10 MHz

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


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Engraved EF121
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.
Electrical Filters Selection Guide
Low-Pass Electrical Filters
High-Pass Electrical Filters
DC Block and Mains Hum Electrical Filters
Engraved EF505
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

  • 5th or 6th Order Elliptic High-Pass Filter Design
  • Selection of 1 dB Passband Windows from 1.2 kHz to 10 MHz
  • Can be Driven by Any 50 Ω Load
  • Designed to be Terminated into High-Impedance Equipment
  • No External Power Supply Required

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
To ensure excellent suppression of frequencies in the stopband region, our 5th and 6th order high-pass filters are designed as high-order elliptic filters, providing superb attenuation of low frequency components. The tables below include more information, such as the 3 dB, 30 dB, and 40 dB stopband frequencies.

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
Thorlabs offers both in-line and coaxial BNC feedthrough styled filters (see Figures 1 and 2 to the right). The EF100 series filters are in-line and feature a box design with two female BNC connectors. The in-line design is intended to be used in between two BNC cables. The EF500 series filters are coaxial and feature a cylindrical design with a male and female BNC connector. This allows the filter to be directly attached to a device, such as an oscilloscope (see image above). Due to the larger size of the in-line filters, it is not recommended that these filters be attached directly to a measurement device. The larger size of in-line filters over coaxial filters is due to the inverse relationship between the filter frequency and the size of the internal electrical components inside the housing.


Posted Comments:
Ichentoolstw  (posted 2019-03-12 09:30:27.953)
To whom it may concern I would like to know,if I order EF-125 for 1pc,how long it get to Taiwan? Thanks your attation! BEST REGARDS Gerry hsu Ichen Tools co.,LTD E-mail add:ichentoolstw @gmail.com
YLohia  (posted 2019-04-05 03:36:51.0)
Hello, stock item quotes and requests should be sent to sales@thorlabs.com. We have reached out to you directly.
mikael.malmstrom  (posted 2018-09-25 15:51:55.403)
My DAQ only has a 50Ohm impedance input will it still work or will I se allot of ringing? (BTW why do you need the Captcha for logged in users?)
YLohia  (posted 2018-09-25 04:39:40.0)
Hello, thank you for contacting Thorlabs. This product line guarantees the spec relative dB pass-band for input into high impedance voltage transfer systems. We don't have data on the exact transfer function when used with a 50 Ω system, since it can depend also on the type of measurement device. They are not really designed for the 50 Ω power transfer systems of some network analyzers, but it is possible to use a 50 Ω scope. Using a 50 Ω scope, we expect the pass band to narrow. We have noted that many customers are happy using the EF500 series product family at impedances below 100 kOhm. The impedance mismatch may, however, cause ringing in some situations.
benjamin.judkewitz  (posted 2018-09-04 10:07:01.987)
Can multiple filters be used serially (e.g. high and low pass to make a band-pass)?
llamb  (posted 2018-09-04 08:41:23.0)
Thank you for contacting Thorlabs. Our electrical filters are designed to be connected to a low-impedance input and to a high-impedance output. Using them serially would mismatch the impedances and likely lead to unwanted ringing effects.

High-Pass Electrical Filter, In-Line, 1.2 kHz to 52 kHz

Filter Box
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Mechanical Drawing of
In-Line Design

The in-line package of these filters offers two female BNC connectors.

Item #a EF111 EF113 EF115 EF121 EF123 EF125
1 dB Passband Windowb >1.2 kHz >2.2 kHz >5.0 kHz >10.2 kHz >22.2 kHz >52 kHz
3 dB Rejection <780 Hz <1.74 kHz <4.1 kHz <9.0 kHz <18.0 kHz <41.0 kHz
30 dB Rejection <550 Hz <0.78 kHz <2.4 kHz <6.6 kHz <11.8 kHz <26.0 kHz
40 dB Rejection <250 Hz <0.58 kHz <1.7 kHz <4.4 kHz <10.8 kHz <24.3 kHz
Frequency Response Curve 
(Click for Graph)
Click for Plot
Raw Data
Click for Plot
Raw Data
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Raw Data
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Raw Data
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Raw Data
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Raw Data
1 dB Window Exceptions
(Click for Graph)
Click for Plot Click for Plot Click for Plot Click for Plot Click for Plot Click for Plot
Source Impedance (Typical) 50 Ω
Load Impedance (Typical)c ≥100 kΩ
Input Voltage (Maximum) ±10 V
Storage Temperature -20 to 70 °C
  • Values reported for each item were measured at 25 °C.
  • At certain high frequencies, exceptions to the 1 dB window can occur. See the graphs in the 1 dB Window Exceptions row for details.
  • Although these filters can be operated with termination resistances below 1 kΩ, the passband will narrow at smaller termination resistances and the performance is not guaranteed.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
EF111 Support Documentation
EF111High-Pass Electrical Filter, >1 kHz Passband, In-Line BNC Feedthrough
$71.96
Today
EF113 Support Documentation
EF113High-Pass Electrical Filter, >2 kHz Passband, In-Line BNC Feedthrough
$71.96
Today
EF115 Support Documentation
EF115High-Pass Electrical Filter, >5 kHz Passband, In-Line BNC Feedthrough
$71.96
Today
EF121 Support Documentation
EF121High-Pass Electrical Filter, >10 kHz Passband, In-Line BNC Feedthrough
$71.96
Today
EF123 Support Documentation
EF123High-Pass Electrical Filter, >22 kHz Passband, In-Line BNC Feedthrough
$71.96
Today
EF125 Support Documentation
EF125High-Pass Electrical Filter, >50 kHz Passband, In-Line BNC Feedthrough
$71.96
Today

High-Pass Electrical Filters, Coaxial, 130 kHz to 10 MHz

The coaxial package of these filters offers one male and one female BNC connector.

Item #a EF505 EF503 EF507 EF517 EF509 EF513 EF515
1 dB Passband Windowb >130 kHz >220 kHz >500 kHz >1 MHz >1.8 MHz >6.7 MHz >10 MHz
3 dB Rejection <77 kHz <114 kHz <305 kHz <592 kHz <1.1 MHz <4 MHz <5.6 MHz
30 dB Rejection <56.9 kHz <83 kHz <227.5 kHz <438 kHz <800 kHz <3 MHz <4.37 MHz
40 dB Rejection <38 kHz <77 kHz <217 kHz <411 kHz <750 kHz <2.85 MHz <4.15 MHz
Frequency Response Curve
(Click for Graph)
Click for Plot
Raw Data
Click for Plot
Raw Data
Click for Plot
Raw Data
Click for Plot
Raw Data
Click for Plot
Raw Data
Click for Plot
Raw Data
Click for Plot
Raw Data
Source Impedance (Typical) 50 Ω
Load Impedance (Typical)c ≥100 kΩ
Input Voltage (Maximum) ±10 V
Storage Temperature -20 to 70 °C
  • Values reported for each item were measured at 25 °C.
  • The performance of each filter is measured out to 500 MHz, except for the EF513, which is measured out to 400 MHz.
  • Although these filters can be operated with termination resistances below 1 kΩ, the passband will narrow at smaller termination resistances and the performance is not guaranteed.
Filter Tube
Click for Details

Mechanical Drawing of
Coaxial Design
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
EF505 Support Documentation
EF505High-Pass Electrical Filter, >130 kHz Passband, Coaxial BNC Feedthrough
$71.96
Today
EF503 Support Documentation
EF503High-Pass Electrical Filter, >220 kHz Passband, Coaxial BNC Feedthrough
$71.96
Today
EF507 Support Documentation
EF507High-Pass Electrical Filter, >500 kHz Passband, Coaxial BNC Feedthrough
$71.96
5-8 Days
EF517 Support Documentation
EF517High-Pass Electrical Filter, >1 MHz Passband, Coaxial BNC Feedthrough
$71.96
Today
EF509 Support Documentation
EF509High-Pass Electrical Filter, >1.8 MHz Passband, Coaxial BNC Feedthrough
$71.96
Today
EF513 Support Documentation
EF513High-Pass Electrical Filter, >6.7 MHz Passband, Coaxial BNC Feedthrough
$71.96
Today
EF515 Support Documentation
EF515High-Pass Electrical Filter, >10 MHz Passband, Coaxial BNC Feedthrough
$71.96
Today

Mounting Clamps


Click to Enlarge

EF123 Filter Mounted using an ECM100 on a Ø1/2" Post

Aluminum Clamps, Post Mountable
These anodized aluminum clamps provide secure mounting for the devices in rectangular housings sold above. The ECM100 fits onto the 1.00" side, while the ECM125 fits onto the 1.25" side. The clamp can snap onto the side of the device and the flexure lock can be tightened using the 2 mm (5/64") hex locking screw on the side.

Each clamp has a #8 (M4) counterbore on the bottom. The counterbore allows the clamp 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
The EPS125 clamp can attach to the 1.25" side of the devices in rectangular housings above. Two devices can be mounted to a single clamp for a secure and compact setup.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
ECM100 Support Documentation
ECM100Aluminum Clamp for Electronics Housing, 1.00"
$17.75
Today
ECM125 Support Documentation
ECM125Aluminum Clamp for Electronics Housing, 1.25"
$18.29
Today
EPS125 Support Documentation
EPS125Double-Sided Plastic Clamp for Electronics Housings, 1.25", Qty. 2
$6.37
Today
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