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The LHBF-48X is designed for processing small bio-electrical signals. The input voltage range is ±12 V and the inputs are protected up to ±100 V. Two overload-LEDs indicate when the linear region of the amplifier is exceeded. All inputs and the output are BNC-connectors.
The LHBF-48X is equipped with a differential input stage with an AC/O/DC switch for each input and an offset compensation. The gain stage allows the amplification of the signal from 1-1000 in 1-2-5 steps. The gain is selected by an ten-position rotary switch.
The amplified signal is applied to the output filter(s). The eight-pole Bessel lowpass filter has sixteen corner frequencies (30 Hz - 20 kHz). The output filter can be bypassed by using a toggle switch. Optionally, the LHBF-48X can be equipped with a single-pole Bessel highpass filter with eleven corner frequencies (0.3 Hz - 10kHz) and an OFF position. A NOTCH filter (50/60 Hz) is also available. The position of the GAIN and of the FILTER switches can be read from monitor outputs (1V/step).

Specifications 

LHBF-48X

INPUT RANGE: ±12 V; protected up to ±100 V
INPUT IMPEDANCE: 1 MOhm related to ground (other values possible), input capacitance: 30 pF
AC COUPLING AT INPUT: corner frequency of 0.1 Hz (if AC /0 /DC switch at BNC connector is switched to AC)
DIFFERENTIAL INPUT: CMR >90 dB
OFFSET COMPENSATION: ±0.1 V, ±1 V or ±10 V by toggle switch and ten-turn potentiometer
LOWPASS FILTER:
8-pole Bessel, attenuation: -48 dB/octave, corner frequencies (Hz): 30, 100, 300, 500, 700, 900, 1.3k, 1.5k, 1.7k, 3k, 10k, 20k 
HIGHPASS FILTER (Option):
1-pole Bessel, attenuation: -8dB/octave, corner frequencies (Hz): 0.3, 3, 10, 30, 100, 300, 500, 800, 1k, 3k, 10k; OFF position
GAIN: rotary switch: 1-2-5-10-20-50-100-200-500-1000
OVERLOAD LED's: starting to light up at ±10 V
FULL POWER BANDWIDTH: >200 kHz
OUTPUT IMPEDANCE: 250 Ohms
OUTPUT VOLTAGE: max. ±12 V, short-circuit protected
LOAD CAPACITANCE: max. 10 nF
GAIN / FREQUENCY MONITOR: 1V / step
POWER REQUIREMENTS: 230 V/115 V AC, 20 W
DIMENSIONS: 19" rackmount cabinet, 483 x 250 x 88 mm

LBF-48X

INPUT: DC (1MOhm, 30pF) or  AC (corner frequency: 1 Hz)

OUTPUT: selectable between filtered or unfiltered

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

LOWPASS FILTER: 100, 200, 300, 400, 500, 750, 900, 1k, 2k, 3k, 4k, 5k, 6k, 7k, 8k, 9k, 10kHz

GAIN: x1, x2, x5, x10, x20, x50, x100

Monitor OUTPUTS for FILTERS and GAIN: 1V / position

DIMENSIONS: 19" rackmount cabinet, 483 x 250 x 88 mm

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