LBF-48X

The LBF-48X amplifier/filter is designed for processing small bio-electrical signals. The input voltage range is ±12 V. All inputs and outputs are BNC connectors.
The unit is equipped with an AC / 0 / DC switch for the input. The input stage is followed by the offset compensation.
The GAIN stage allows amplification of the signal from 1-100 in 1-2-5 steps. The GAIN is selected by an 7-position rotary switch.
The amplified signal is passed through the LOWPASS filter. The eight-pole Bessel LOWPASS FILTER has sixteen corner frequencies (100 Hz…10 kHz). The LOWPASS FILTER can also be bypassed by using the UNFILTERED OUTPUT.
The OFFSET is cancelled by setting two controls, a ten-turn potentiometer and a x0.1 V, x1 V range switch. DC offsets can be compensated either by the using the OFFSET control or they can be eliminated using the AC position of the input switch. The positions of GAIN and FILTER switch can be read from monitor outputs (1V/step).

Signal processing instruments are also available as modules for the EPMS-07 system.

 

  • Low pass (30 Hz - 20 kHz) and High pass filter (0.3 Hz - 20 kHz)
  • Adjustable gain (1 - 1000)
  • Offset compensation
  • Optional notch filter
  • Monitor outputs for readout of filter- and gain settings

Ordering

Part no. Description
LBF-48X-4L Bessel filter system with 4-pole low pass filter
LBF-48X-8L Bessel filter system with 8-pole low pass filter
LBF-Notch 50/60 Hz notch filter for LBF-48X

Technical Data

INPUT RANGE:
±12 V

INPUT IMPEDANCE:
1 MΩ related to ground (other values possible), input capacitance: 30 pF

AC COUPLING AT INPUT:
corner frequency of 1 Hz (if AC /0 /DC switch at BNC connector is switched to AC)

OFFSET COMPENSATION:
±0.1 V or ±1 V by toggle switch and ten-turn potentiometer

LOWPASS FILTER:
8-pole Bessel, attenuation: -48 dB/octave, corner frequencies (Hz): 100, 200, 300, 400, 500, 750, 1k, 2k, 3k, 4k, 5k, 6k, 7k, 8k, 9k, 10k

GAIN:
rotary switch: 1-2-5-10-20-50-100

FULL POWER BANDWIDTH:
>30 kHz

OUTPUT IMPEDANCE:
250 Ω

RANGE OF OUTPUT:
max. ±12 V

LOAD CAPACITANCE:
max. 10 nF

GAIN / FREQUENCY MONITOR:
1V / step

POWER REQUIREMENTS:
230 V/115 V AC, 20 W

DIMENSIONS:
19" rackmount cabinet, 19" (483 mm), 10" (250 mm), 3.5" (88 mm)

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