LHBF – Bessel Filter

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Description

LHBF – High and low pass Bessel Filter

  • 8 pole low pass filter with 16 corner frequencies
  • gain from 1 to 1000
  • differential input

The LHBF-48X amplifier/filter is designed for processing small bio-electrical signals. The unit is equipped with a differential input stage with an AC/0/DC switch for each input. The input stage is followed by the offset compensation, the GAIN stage (amplification from 1-1000), a HIGHPASS filter (one pole Bessel filter, 15 corner frequencies and DC) and a LOWPASS filter (four-pole Bessel filter, 16 corner frequencies).

Last Updated on June 9, 2026

Features

The LHBF-48X Amplifier/Filter features a differential input stage with high common-mode rejection, ensuring accurate processing of small bio-electrical signals. It offers selectable AC, 0, and DC input coupling for flexible signal handling, along with precision offset compensation for stable baseline adjustment. The amplifier provides a wide gain range from 1× to 1000×, allowing fine control of signal amplification across different experimental requirements.

For signal shaping, the unit incorporates high-performance Bessel filters, including a multi-pole low-pass filter with 16 selectable corner frequencies and an optional high-pass filter with multiple cutoff settings and DC mode. An optional 50/60 Hz notch filter is available for effective suppression of line noise. With high input impedance and a wide output range, the LHBF-48X is optimized for low-noise, high-fidelity signal conditioning in electrophysiology and biomedical research applications.

Last Updated on June 9, 2026

Specifications

Parameter Details
Input Range ±12 V
Input Impedance 10 kΩ related to ground (other values possible), input capacitance: 30 pF
AC Coupling at Input Corner frequency 0.1 Hz (when AC/0/DC switch is set to AC)
Differential Input CMR > 90 dB
Offset Compensation ±0.1 V, ±1 V, or ±10 V via toggle switch and ten-turn potentiometer
Low-Pass Filter 8-pole Bessel, −48 dB/octave; 30 Hz to 20 kHz (30, 100, 300, 500, 700, 900, 1.3k, 1.5k, 1.7k, 3k, 10k, 20k Hz)
High-Pass Filter 1-pole Bessel, −8 dB/octave; 0.3 Hz to 10 kHz + OFF (0.3, 3, 10, 30, 100, 300, 500, 800 Hz, 1k, 3k, 10k)
Gain Rotary switch: 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000
Overload Indicators LEDs activate at ±10 V
Full Power Bandwidth 30 kHz
Output Impedance 250 Ω
Output Voltage Max. ±12 V
Load Capacitance Max. 10 nF
Gain / Frequency Monitor 1 V per step
Power Requirements 230 V / 115 V AC, 20 W
Dimensions 19” rackmount cabinet: 483 mm × 250 mm × 88 mm

Last Updated on June 9, 2026

Downloads

LHBF48X-manual

Last Updated on June 9, 2026

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