npi LPBF-01GX

The LPBF-01GX amplifier / filter is designed to amplify and filter small bio-electrical signals. The input voltage range is ±12 V. All inputs and the output are BNC-connectors.

The unit is equipped with an unipolar input stage with an AC/O/DC switch. The input stage is followed by the offset compensation. The gain stage allows the amplification of the signal from 1-100 in 7 steps set by a rotary switch.

The amplified signal is applied to the output filter. This four-pole Bessel lowpass filter has sixteen corner frequencies (20 Hz - 20 kHz). An eight-pole filter is available on request. The output filter can also be bypassed by using a toggle switch. Filter and gain are monitored at BNC connectors (1V / step).

Specifications

INPUT RANGE:
±12 V

INPUT IMPEDANCE:
1 MΩ related to ground input capacitance: 30 pF

AC-COUPLING AT INPUT:
Corner frequency of 0.1 Hz

OUTPUT IMPEDANCE:
range: ±12 V into 1 kΩ / ±1 V into 50 Ω

GAIN / FREQUENCY MONITOR:
1V / step

FILTER:
4-Pole lowpass Bessel filter, attenuation: -24 dB/octave,
corner frequencies (Hz): 20, 50, 100, 200, 300, 500, 700, 1k, 1,3k, 2k, 3k, 5k, 8k, 10k, 13k, 20k

GAIN:
Rotary switch: 1, 2, 5, 10, 20, 50, 100

OFFSET-COMPENSATION:
set by ten-turn potentiometer, range ±0.1, ±1 V or OFF, selected by toggle switch
OFF position separately adjustable with trim pot

DIMENSIONS:
front panel 12 HP (60.6 mm) x 3U (128,5 mm), 7" (175 mm) deep.

Options

LPBF-01GX Low  pass Bessel filter module with gain,  4-pole low pass Bessel filter with 16  corner frequencies and gain up to 100.