Bridge Amps

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If you’d like to speak to someone immediately, office contact information is available from the contact page.

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Overview

ADInstruments Bridge Amps are single-channel or multi-channel, non-isolated bridge amplifiers 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. To connect transducers with Grass connectors, purchase a Grass Adapter Cable.

Configurations


Bridge Amp

FE221

A single-channel, non-isolated bridge amplifier designed to allow the PowerLab to connect to most DC bridge transducers.

Octal Bridge Amp

FE228

An eight-channel, non-isolated bridge amplifier designed to allow the PowerLab to connect to most DC bridge transducers.

Quad Bridge Amp

FE224

A four-channel, non-isolated bridge amplifier designed to allow the PowerLab to connect to most DC bridge transducers.

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

 

Details

Product Codes


FE221
Bridge Amp
ce
FE228
Octal Bridge Amp
ce
FE224
Quad Bridge Amp
ce

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.

Requirements

  • PowerLab /25, /30 and /35 or later units
  • 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)

Downloads