Bridge Amps

Bridge Amps

Pressure, Force & Light Amplifiers

ADInstruments Bridge Amps are single-channel or multi-channel, non-isolated bridge amplifiers designed to allow a C Series Front End Interface or traditional PowerLab to connect to most DC bridge transducers.

Overview

ADInstruments Bridge Amps are single-channel or multi-channel, non-isolated bridge amplifiers designed to allow a C Series Front End Interface or traditional PowerLab to connect to most DC bridge transducers, including commonly available force transducers, temperature probes, displacement transducers, pressure transducers, and similar devices. They are capable of supporting various powered transducers, and certain low impedance unpowered transducers. Various connectors & cables are available to interface a variety of transducers to a Bridge Amp, such as a Grass Adapter Cable for connecting to transducers with Grass connectors.

The Bridge Amps are compatible with a range of ADInstruments and partnering products including:

Product Configurations

Bridge Amp

Product Code
FE221
ce

A single-channel, non-isolated bridge amplifier designed to allow a C Series Front End Interface or traditional PowerLab to connect to most DC bridge transducers.

$1,454.00
Ships from United States Estimated delivery 2-5 business days

Quad Bridge Amp

Product Code
FE224
ce

A four-channel, non-isolated bridge amplifier designed to allow a C Series Front End Inteface or traditional PowerLab to connect to most DC bridge transducers.

$4,897.00
Ships from United States Estimated delivery 2-5 business days

Octal Bridge Amp

Product Code
FE228
ce

An eight-channel, non-isolated bridge amplifier designed to allow a C Series Front End Interface or traditional PowerLab to connect to most DC bridge transducers.

$8,612.00
Ships from United States Estimated delivery 2-5 business days

Bridge Amp (with Front End Interface)

Product Code
FE221/CS
ce

The FE221/CS bundles the FE221 Bridge Amp together with a C Series Front End Interface to make it compatible with PowerLab C.

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Quad Bridge Amp (with Front End Interface)

Product Code
FE224/CS
ce

The FE224/CS bundles the FE224 Quad Bridge Amp together with a C Series Front End Interface to make it compatible with PowerLab C.

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Octal Bridge Amp (with Front End Interface)

Product Code
FE228/CS
ce

The FE228/CS bundles the FE228 Octal Bridge Amp together with a C Series Front End Interface to make it compatible with PowerLab C.

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Key Features

  • Low-drift instrumentation amplifier
  • Software-controlled zeroing
  • Wide amplification range (±200 µV to ±5 V in 14 steps) for use with a wide range of transducers
  • A high impedance input (2 x 1 MΩ single-ended, 2 MΩ differential) ensures that the Bridge Amp will not load the transducer
  • Overload light to indicate whether the attached transducer is operating correctly or incorrectly

Support

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Details and Tech Specs

Technical

Single, Quad and Octal Bridge Amps (FE221, FE224 & FE228) 

Input

  • Number of inputs: 1 (single), 4 (Quad) or 8 (Octal); 8-pin DIN
  • Input configuration: Differential
  • Amplification range: ±200 μV to ±5 V full scale in 14 steps (combined PowerLab and Bridge Amp)
    • ±5 V
    • ±2 V
    • ±1 V
    • ±500 mV
    • ±200 mV
    • ±100 mV
    • ±50 mV
    • ±20 mV
    • ±10 mV
    • ±5 mV
    • ±2 mV
    • ±1 mV
    • ±500 μV
    • ±200 μV
  • Amplification accuracy: ±0.5% (combined PowerLab & Bridge Amp)
  • Maximum input voltage: ±10 V
  • Input impedance: 2 x 1 MΩ (Single-ended); 2 MΩ (Differential)
  • Low-pass filtering: 1 Hz to 2 kHz in eight steps (software selectable)
  • Frequency response (-3 dB): 2 kHz maximum at all gains with the 2 kHz filter selected.
  • CMRR (differential): 100 dB at 50 Hz (typical).
  • Input noise: <1μVrms referred to input at highest gain

Excitation and Zeroing

  • Excitation voltage range: 0-20 volts DC (±10 V referred to ground), adjusted by external resistor
  • Transducer drive current: ±45 mA maximum
  • Zeroing circuitry: Software-controlled, either manual or automatic Internal offsetting range: ±10 V (1 V - 5 V range) ±1 V (100 mV - 500 mV range) ±100 mV (200 μV - 50mV)
  • Internal offset resolution: 16 bit (internal DAC) ± 32 000 steps about 0 V.
    • 1, 2, 5 V -310 μV/step
    • 100 mV, 200 mV, 500 mV - 31 μV/step
    • 200 μV to 50 mV - 3 μV/step

Control Port

  • 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.

Physical Configuration

  • Dimensions (h × w × d) and Weight:
    • Single (FE221): 55 mm × 120 mm × 260 mm (2.2" × 4.7" × 10.2"); 1.2 kg
    • Quad (FE224): 55 mm × 240 mm × 260 mm (2.2" × 9.4" × 10.2"); 2.1 kg
    • Octal (FE228): 70 mm × 240 mm × 260 mm (2.8" × 9.4" × 10.2"); 2.6 kg
  • Power requirements: 0.8 W (FE221); 2.5 W (FE224); 5.0 W (FE228) (without transducer attached)
  • Operating temperature range: 5 to 35 °C, 0 to 90% relative humidity (non-condensing)

Safety

  • EMC: Approved to EN61326-1:2006 Standard

ADInstruments reserves the right to alter these specifications at any time.

Product Codes

FE221
Bridge Amp
FE224
Quad Bridge Amp
FE228
Octal Bridge Amp
FE221/CS
Bridge Amp (with Front End Interface)
FE224/CS
Quad Bridge Amp (with Front End Interface)
FE228/CS
Octal Bridge Amp (with Front End Interface)

Compatibility

FE221

Operating System Recommended Hardware Alternate Hardware
LabChart Lightning Windows / Mac PowerLab C + Front End Interface Traditional PowerLab
LabChart 8 Windows / Mac PowerLab C + Front End Interface Traditional PowerLab

FE224

Operating System Recommended Hardware Alternate Hardware
LabChart Lightning Windows / Mac PowerLab C + Front End Interface Traditional PowerLab
LabChart 8 Windows / Mac PowerLab C + Front End Interface Traditional PowerLab

FE228

Operating System Recommended Hardware Alternate Hardware
LabChart Lightning Windows / Mac PowerLab C + Front End Interface Traditional PowerLab
LabChart 8 Windows / Mac PowerLab C + Front End Interface Traditional PowerLab

Requirements

  • PowerLab /SP, /25, /26, /30 or /35
  • Either LabChart 6 or later (Windows and Macintosh) or Chart 5.4.2 or later (Windows and Macintosh)
  • Scope for Windows (3.7.8 or later) or Scope for Mac (4.0.3 or later)

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