Description
DESCRIPTION
The NL125/6 Band Pass Filter module employs two active sections to control the variable high-pass and low-pass characteristics along with a mains frequency Notch filter (jumper selectable for 50Hz or 60Hz). It is a combination/replacement for both the NL125 and NL126. The NL125/6 is commonly used in combination with our NL100AK/NL104A AC Preamplifier headstage and module for band-pass filtering of signals from extracellular recordings.
The low frequency cut-off point can be set continuously from 0.5Hz to 5kHz with a single turn potentiometer, in four switched ranges. Similarly the high frequency cut-off can be set continuously from 5Hz to 50kHz in four switched ranges. DC and WB (wide band) switch positions by-pass the lower and upper filter sections, respectively.
The unit has two active notch filters which provided for the rejection of line frequency interference; this is selectable on the board, by the user, as either 50Hz (as the original NL125) or 60Hz (as the original NL126), with a 20Hz notch width (-3dB points).
The design is implemented using low noise active linear circuitry and does not suffer any of the aliasing problems that are encountered when cheaper methods are used.
The LF-CUT (High-pass) filter has a rotary switch that selects the 4 frequency settings and a continuous, calibrated control gives adjustment over that range. This gives a wide range with 12dB/octave [40dB/decade] attenuation below the selected frequency value. The ‘DC’ switch position by-passes the filter sections completely.
The HF-CUT (Low-pass) filter has a rotary switch that selects the 4 frequency settings and a continuous, calibrated control gives adjustment over that range. This gives a wide range with 12dB/octave [40dB/decade] attenuation above the selected frequency value. The ‘WB’ (wide-band) switch position by-passes the filter sections completely.
For more information about the NL125/6 Band Pass Filter, or any of our other filter and conditioner modules, you can reach out to our expert team. Contact us by calling 01707 328347 or via email at [email protected]. Our team will be more than happy to help you with any of your queries.
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