Filter Responses

Selecting a filter for a signal conditioning application can be difficult. However many filtering applications are similar and can be solved using a few optimised filter responses.
All filters, whether analogue or digital, change the signals passing through them. For any filter characteristic, the filter effect is strongly dependant on the kind of information contained in the signal. 
We have a page that may be of interest that looks at the best filter for your Task. 
Kemo Standard filter responses
Kemo has been manufacturing filtering systems for over 40 years. The many applications to which our filters have been put have resulted in a wide range of filter responses. Our Standard Response  data sheet shows a range of filter responses which covers most needs, many of these are held in stock. 
We feel that it is important to be able to compare the technical performance of different types of filter in a consistent way. Our "Filter Response Information Leaflets" use a uniform format to provide a complete picture of the filter characteristics in the amplitude, phase and time domains, independent of the intended application. This is of course no substitute for experimentation, and we encourage users to explore the performance of their system with filters fitted, to get an idea of not only of the suitability of the response itself, but also the signal quality aspects of the hardware (noise, linearity, offset etc) which are also related to the choice of the option response. 

There are leaflets for the most used Kemo filter responses, each with a brief description of the type of filter. 

Anti-aliasing Filter Response: 01LP
Filter order and type: n=8 lowpass Basic stopband: -80dB at 1.5 times Fc

8 Pole Butterworth Filter Response: 03LP
Filter order and type: n=8 lowpass Basic stopband: 48dB/octave (48dB at 2 times Fc)

4 PoleButterworth Filter Response: 05LP
Filter order and type: n=4 lowpass Basic stopband: 24dB/octave (24dB at 2 times Fc)

8 Pole Bessel Filter Response: 07LP
Filter order and type: n=8 lowpass Basic stopband: 48dB/octave (-13dB at 2 times Fc)

4 Pole Bessel Filter Response: 09LP
Filter order and type: n=4 lowpass Basic stopband: 24dB/octave (-13dB at 2 times Fc)

General Purpose Filter Response: 41LP
Filter order and type: n=8 lowpass Basic stopband: -82dB at 3 times Fc Linear Phase

Filter Set:  8.03 Butterworth, Flat and Pulse 
Filter order and type: n=8 lowpass Basic stopband: 48dB/octave (-52dB at 2 times Fc)
Filter set for BenchMaster 8.03.

Filter Set:8.05 Butterworth , Flat, and Pulse
Filter order and type: n=4 lowpass Basic stopband: 24dB/octave (-26dB at 2 times Fc)
Filter set for BenchMaster 8.05.

Filter Set:  8.13 Butterworth, Flat, and Pulse
Filter order and type: n=8 lowpass Basic stopband: -93dB at 2 times Fc
Filter set for BenchMaster 8.13

Notch Filter Sharp Q=10
Filter order and type: n=8 notch, stopband >-80dB
Optimised for 50 Hz and 60 Hz.
Available as 1200 Series Filter Modules

Filter Response:  L1
Filter order and type: n=8 lowpass Basic stopband: -80dB at 1.5 times Fc

Filter Response:  L2
Filter order and type: n=8 lowpass Basic stopband: -116dB at 4.6 times Fc
Filter set for VBF40 Series

Filter Response:  21LP
Filter order and type: n=6 lowpass Basic stopband: -102dB at 4 times Fc

Filter Response:  21pulLP
Filter order and type: n=6 lowpass Basic stopband: -102dB at 4 times Fc

Filter Response:  31LP
Filter order and type: n=6 lowpass Basic stopband: 36dB/octave (36dB at 2 times Fc)

Filter Response:  31pulLP
Filter order and type: n=6 lowpass Basic stopband: 36dB/octave (-39.3dB at 2 times Fc)

Filter Response:  35LP
Filter order and type: n=8 lowpass Basic stopband: -85dB at 2 times Fc

Filter Response:  35pulLP
Filter order and type: n=8 lowpass Basic stopband: -87.4dB at 2 times Fc

Filter Response:  37LP
Filter order and type: n=6 lowpass Basic stopband: -82dB at 3 times Fc

Filter Response:  37pulLP
Filter order and type: n=6 lowpass Basic stopband: -82.9dB at 3 times Fc

Filter Response: 41pulLP
Filter order and type: n=8 lowpass Basic stopband: 82dB at 3 times Fc

Filter Response:  49LP
Filter order and type: n=8 lowpass Basic stopband: -77dB at 1.5 times Fc

Filter Response:  49pulLP
Filter order and type: n=8 lowpass Basic stopband: -79.2dB at 1.5 times Fc

Filter Response:  79LP
Filter order and type: n=6 lowpass Basic stopband: -70dB at 3 times Fc

Filter Response:  79pulLP
Filter order and type: n=6 lowpass Basic stopband: -70dB at 3 times Fc

Filter Response:  85LP
Filter order and type: n=8 lowpass Basic stopband: -78dB at 2 times Fc

Filter Response:  89LP
Filter order and type: n=8 lowpass Basic stopband: -74dB at 2.2 times Fc

Filter Response:  89pulLP
Filter order and type: n=8 lowpass Basic stopband: -74.8dB at 2.2 times Fc

Filter Response: Option 99
Filter order and type: n=4 lowpass Basic stopband: -68dB at 7.2 times Fc