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Shimmer3 Bridge Amplifier+ Unit

Individual Sensors

The Bridge Amplifier+ unit allows for a new range of sensors to be connected to the Shimmer3 platform. The unit allows for strain and load cell data acquisition for force and resistance measurement. The module contains a bridge amplifier, excitation source and connector enabling force measurement with the Shimmer, as well as a buffered resistance divider amplifier to enable resistance measurements.

Out of stock

Description

New users to Shimmer please visit our Bridge Amplifier development kit page for purchasing Shimmer3 Bridge Amplifier+. The development kit will contain all items required to collect data with Shimmer.

The Bridge Amplifier+ unit allows for a new range of sensors to be connected to the Shimmer3 platform. The unit allows for strain and load cell data acquisition for force and resistance measurement. The module contains a bridge amplifier, excitation source and connector enabling force measurement with the Shimmer, as well as a buffered resistance divider amplifier to enable resistance measurements.

 

The Bridge Amplifier+ module is ideal for all load, weight, force, torque and pressure measurements and the resistance divider input is suitable for variable resistance sensors, such as a temperature probe.

Additional information

Weight 0.6 kg
Dimensions 45 × 33 × 1 cm

Features & Benefits

Specific Features

◉ Interface strain gauge or load cell sensors with Shimmer3 to measure load, weight, force, torque or pressure
◉ Interface variable resistance sensor with Shimmer for example, temperature sensitive resistor to measure ambient, skin-surface or other temperatures
◉ Provides excitation source for strain gauge or load cell, meaning no external voltage source is required
◉ Excitation source and amplifier enable are software controlled, allowing optimisation of power consumption
◉ Two channels of output from bridge amplifier, providing both low and high gain; low gain is ideal for bipolar inputs, whilst high gain provides additional 3x gain for unipolar load cells
◉ EEPROM storage device enables expansion board detection and identification, as well as 2032 bytes of data storage available to user.

Benefits over previous generation Strain Gauge

◉ Bridge Amplifier input for Strain Gauge as well as resistance divider input
◉ Strain Gauge/Resistance data can be measured simultaneously with 10DOF kinematic data
◉ Record temperature of skin-surface or ambient temperature with Shimmer3
◉ Now has use of an on-board EEPROM allows automatic identification of the expansion board

Specs

Bridge Amplifier+ Unit Includes:

Shimmer3 Bridge Amplifier+ unit x 1

◉ Skin surface temperature pack x1 (3 in a pack)

◉ TTRS pack x 1 (6 in a pack)

Bridge Amplifier Specification overview

◉ Gain :183.7 ± 1% (Normal Channel), 551 (3x Normal) ± 1% (High Gain Channel)
◉ Frequency Range1: DC..1kHz (Normal Channel), DC..100Hz (High Gain Channel)
◉ Common Mode Rejection1: higher than 110dB
◉ Input Impedance1: 50MOhm
◉ Input Signal Range: ±7mV, ±2.5mV/V (Normal Channel), 0-4mV, ±1.43mV/V (High Gain Channel)
◉ Zero-load Noise: 12mV RMS both outputs, < 1% full-scale (Normal Channel), < 0.5% full-scale (High Gain Channel)
◉ Excitation Voltage: 2.8V ± 5%
◉ Input Protection: Current limiting, EMI/RF suppression

Resistance Amplifier

◉ Gain1: 10.1 +/-2%
◉ Pull-up/Input Impedance: 200kOhms to +3.0V
◉ Frequency Range1: DC..408Hz (2nd Order)
◉ Signal Range: 280mV or 20kOhms (1k­­Ω-20kΩ measurement range recommended)
◉ Zero-load Noise: 0.1 mV RMS at ouput.

◉ Connections: Two 3.5mm jacks (headphone type) for 4 conductor shielded cable for Bridge Amplifier and Resistance Amplifier,
◉ Current Consumption: < 100µA (Excitation disabled), 17mA (Excitation enabled).
◉ Compact Dimensions 65X32X12mm
◉ EEPROM memory: 2048 bytes

Apps

◉ Strength, capacity and force measurement
◉ Resistance measurement
◉ Rehabilitation
◉ Sports training
◉ Environmental monitoring
◉ Fall risk assessment (grip strength)