Bioelectric Signal Amplifier Modules

Bioelectric Signal Amplifier modules

BPA

Bio Potential Amplifier Module type 675

The HSE Biopotential Amplifier BPA Type 675 is a universal amplifier for the direct measurement of biological signals such as ECG, EMG, EEG, ENG, as well as for measurement using transducers with a strain gauge system. The input circuit of the BPA does not include an isolation amplifier (no potential separation between sensing electrodes and circuit ground of the PLUGSYS measuring system). It is designed specifically for physiological and pharmacological animal experiments. For clinical use and for difficult measurements on animals where potential separation is required, a headstage with an isolation amplifier circuit Type 675/1 is available as an accessory.

Description

Input direct for biological signals (ECG, EMG, EEG, ENG) and for strain gauge bridge transducers

Input impedance higher than 100 MOhm

Input bias current 30 nA max

Input capacy 1.5 nF

Input circuit differential amplifier with protection circuit against static discharges and 15 kHz input filter for h.f. suppression

Signal input 8-pin Binder (Amphenol) socket with screw lock. The pin connections correspond to those of the standard 3-pin ECG input cable with Binder (Amphenol) plug.

Signal output a) internally through the system bus of the PLUGSYS measuring system. The signal output is assigned to the connecting lines AV-1 to AV-16 through a jumper.
b) on the front panel through a BNC socket ±10 Volt with an output impedance of 100 Ohm.

Analog indication through a LED bargraph +13/–7 LEDs for monitoring the applied signal. The display sensitivity can be changed by a key from +10/–5 Volt to +1/–0.5 Volt.

Transducer supply 5 V as a bridge supply for strain gauge transducers and supply for external amplifiers (headstages).

Gain 20x, 100x, 200x, 1000x, 2000x and 10 000x selected by a switch, can be varied by a multi-turn trimmer within the range 10 to 100 % (based on the current amplification setting)

Electrical calibration CAL automatic calibration steps operated by zero key, for transducer calibration and evaluation of the input signal. The calibration voltage 0.3-1-3-10-30-100 mV is changed automatically to suit the amplification setting.

Frequency range D.C. to 10 kHz (- 3 dB)

High-pass filter 12 settings, range 0.03 Hz to 10 kHz (– 3 dB)

Low-pass filter 10 settings, range d.c. to 100 Hz (– 3 dB)

Filter indication the settings of the high-pass and low-pass filters are indicated as a frequency pass band using an LED line on the front panel.

Notch filter (HUM-ELIMINATION) a blocking filter can be switched in by pressing a key to suppress interference from the 50 (60) Hz main power supply.

Quick start rapid discharge of the coupling capacitors (on ECG, for example) by pressing a key.

Auto zero automatic zero adjustment by pressing a key.

Manual zero manual zero adjustment for correcting high input offset voltages which exceed the automatic adjustment range of the Auto Zero.

Signal output MUX after pressing the MUX (MULTIPLEX) key the output signal of the BPA is switched to the common output (AM). The signal can be monitored by an optional DVM (Digital VoltMeter) module or with an external oscilloscope or analog recorder.

Dimensions module of 19" rack, Euroboard format 220 mm, width 8 E (40.5 mm), height 3 U (128.7 mm), depth Europe size (220 mm)

Connector DIN 41612 96-pin VG

Power supply 5 Volt 1.2 A from PLUGSYS system bus

Weight 500 g

HUGO SACHS ELEKTRONIK-HARVARD APPARATUS GmbH
Gruenstrasse 1 · D-79232 March-Hugstetten · GERMANY
Phone: +49 (0) 76 65 - 92 00-0 · Fax: +49 (0) 76 65 - 92 00-90

Description
Input	direct for biological signals (ECG, EMG, EEG, ENG) and for strain gauge bridge transducers
Input impedance	higher than 100 MOhm
Input bias current	30 nA max
Input capacy	1.5 nF
Input circuit	differential amplifier with protection circuit against static discharges and 15 kHz input filter for h.f. suppression
Signal input	8-pin Binder (Amphenol) socket with screw lock. The pin connections correspond to those of the standard 3-pin ECG input cable with Binder (Amphenol) plug.
Signal output	a) internally through the system bus of the PLUGSYS measuring system. The signal output is assigned to the connecting lines AV-1 to AV-16 through a jumper. b) on the front panel through a BNC socket ±10 Volt with an output impedance of 100 Ohm.
Analog indication	through a LED bargraph +13/–7 LEDs for monitoring the applied signal. The display sensitivity can be changed by a key from +10/–5 Volt to +1/–0.5 Volt.
Transducer supply	5 V as a bridge supply for strain gauge transducers and supply for external amplifiers (headstages).
Gain	20x, 100x, 200x, 1000x, 2000x and 10 000x selected by a switch, can be varied by a multi-turn trimmer within the range 10 to 100 % (based on the current amplification setting)
Electrical calibration	CAL automatic calibration steps operated by zero key, for transducer calibration and evaluation of the input signal. The calibration voltage 0.3-1-3-10-30-100 mV is changed automatically to suit the amplification setting.
Frequency range	D.C. to 10 kHz (- 3 dB)
High-pass filter	12 settings, range 0.03 Hz to 10 kHz (– 3 dB)
Low-pass filter	10 settings, range d.c. to 100 Hz (– 3 dB)
Filter indication	the settings of the high-pass and low-pass filters are indicated as a frequency pass band using an LED line on the front panel.
Notch filter	(HUM-ELIMINATION) a blocking filter can be switched in by pressing a key to suppress interference from the 50 (60) Hz main power supply.
Quick start	rapid discharge of the coupling capacitors (on ECG, for example) by pressing a key.
Auto zero	automatic zero adjustment by pressing a key.
Manual zero	manual zero adjustment for correcting high input offset voltages which exceed the automatic adjustment range of the Auto Zero.
Signal output MUX	after pressing the MUX (MULTIPLEX) key the output signal of the BPA is switched to the common output (AM). The signal can be monitored by an optional DVM (Digital VoltMeter) module or with an external oscilloscope or analog recorder.
Dimensions	module of 19" rack, Euroboard format 220 mm, width 8 E (40.5 mm), height 3 U (128.7 mm), depth Europe size (220 mm)
Connector	DIN 41612 96-pin VG
Power supply	5 Volt 1.2 A from PLUGSYS system bus
Weight	500 g