LHBF-48X

The LHBF-48X is designed for processing small bio-electrical signals. The input voltage range is ±12 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 (20 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 sixteen corner frequencies (DC, 0.1 Hz - 3kHz) 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).
Signal processing instruments are also available as modules for the EPMS-07 system.

Ordering

Part no. Description
LHBF-48X-4L Bessel filter system with 4-pole low pass filter
LHBF-48X-4HL Bessel filter system with 4-pole low pass filter and 1-pole high pass filter
LHBF-48X-8L Bessel filter system with 8-pole low pass filter
LHBF-48X-8HL Bessel filter system with 8-pole low pass filter and 1-pole high pass filter
LHBF-Notch 50/60 Hz notch filter for LHBF-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 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:

1-pole Bessel, attenuation: -8 dB/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 LEDS:
starting to light up 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:

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)