Bridge Amplifiers for PowerLab

Bridge Amplifiers for PowerLab

The FE221 Bridge Amplifier is designed to allow the PowerLab to connect to most DC bridge trans-ducers, including commonly available force transducers, temperature probes, light meters, displacement transducers, pressure transducers, and similar devices. They are capable of supporting various powered transducers, and certain low-impedance unpowered transducers.

Item# Description U.S. List Price Quantity
77-0254 Bridge Amplifier (FE221)
77-0256 Octal Bridge Amplifier (FE228)
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The FE221 Bridge Amplifier is designed to allow the PowerLab to connect to most DC bridge transducers, including commonly available force transducers, temperature probes, light meters, displacement transducers, pressure transducers, and similar devices. They are capable of supporting various powered transducers, and certain low-impedance unpowered transducers.


Compatibility:
An overload light on the front of each input indicates whether the attached transducer is operating correctly or incorrectly. If the overload light is on the transducer is incompatible with the Bridge Amp and should be disconnected. Contact your nearest ADInstruments rep for assistance.

The Bridge Amps are compatible with PowerLab 35 series.

The following are some of the transducers suitable for use with the Bridge Amps:

MLT0015 High Grade Isotonic Transducer

MLT844 Physiological Pressure Transducer

MLT0380/D Reusable BP Transducer

MLT1020F Plethysmograph Finger Clip

MLT0201 Force Transducer (5mg-25g)

MLT4221/D Skin Temperature Probe

MLT415/D Nasal Temperature Probe

MLT0202 Sensitive ForceTransducer (0-25 g)

MLT1199 Blood Pressure Transducer/cable kit

The Bridge Amps are supplied with the following:

• I²C Cable (9-pin plug to 9-pin receptacle)

• Bridge Amp Owner's Guide

• BNC to BNC Cables

– cable with FE221

– cables with FE224

• DIN Connector Kits

– 1 kit with FE221

– 4 kit with FE224

Applications:

Used for measuring force, displacement and physiological pressures. Ideal for multi-channel isolated tissue studies.
Specifications77-025477-0256
Amplification Accuracy±0.5% (combined PowerLab & Bridge Amp)±0.5% (combined PowerLab & Bridge Amp)
Amplification Range+/- 200µV to +-5V, full scale (combined PowerLab and Bridge Amp)+/- 200µV to +/- 5V, full scale (combined PowerLab and Bridge Amp)
Analog Input ConfigurationDifferentialDifferential
Analog Inputs1 (Single) .8-pin DIN8 (Octal) .8-pin DIN
CMRR Differential100 dB at 50 Hz (typical)100 dB at 50 Hz (typical)
CertificationsCECE
Control PortI²C Port Power and control bus for front-end units. Supports a number of front-ends dependent on the PowerLab. Interface communications rate of ~50 Kbits/s.I²C Port Power and control bus for front-end units. Supports a number of front-ends dependent on the PowerLab. Interface communications rate of ~50 Kbits/s.
Dimensions H x W x D Metric55 x 120 x260 mm70 x 240 x 260 mm
Excitation and Zeroing Excitation Voltage Range0-20 volts DC (±10 V referred to ground), adjusted by external resistor0-20 volts DC (±10 V referred to ground), adjusted by external resistor
Excitation and Zeroing Internal Offset Resolution16 bit (internal DAC) ± 32 000 steps about 0V

1, 2, 5 V -310 µV/step

100 mV, 200 mV, 500 mV - 31µV/step

200 µV to 50 mV - 3 µV/step
16 bit (internal DAC) ± 32 000 steps about 0V

1, 2, 5 V -310 µV/step

100 mV, 200 mV, 500 mV - 31µV/step

200 µV to 50 mV - 3 µV/step
Excitation and Zeroing Internal Offsetting Range±10 V (1 V - 5 V range)
±1 V (100 mV - 500 mV range)
±100 mV (200 µV - 50 mV)
±10 V (1 V - 5 V range)
±1 V (100 mV - 500 mV range)
±100 mV (200 µV - 50 mV)
Excitation and Zeroing Transducer Drive Current±45 mA±45 mA
Excitation and Zeroing Zeroing CircuitrySoftware-controlled, either manual or automaticSoftware-controlled, either manual or automatic
Filtering Low Pass Filter1 Hz to 2 kHz in eight steps (software selectable)1 Hz to 2 kHz in eight steps (software selectable)
Frequency Response2 kHz maximum at all gains with the 2 kHz (-3 dB) filter selected.2 kHz maximum at all gains with the 2 kHz (-3 dB) filter selected.
Input Impedance2 x 1 MΩ (Single-ended) 2 MΩ (Differential)2 x 1 MΩ (Single-ended) 2 MΩ (Differential)
Input Noise< 1µVrms referred to input at highest gain< 1µVrms referred to input at highest gain
Maximum Input Voltage±10 V±10 V
Maximum Power Needs0.8 W5.0 W
ModelFE221FE228
Operating Conditions5 to 35 °C, 0 to 90% relative humidity (non-condensing)5 to 35 °C, 0 to 90% relative humidity (non-condensing)
Package11
Product FamilyData AcquisitionData Acquisition
Weight Metric1.2 kg2.6 kg