Logging Physiological Data | Data Acquisition

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data acquisition hardware
Logging subject data has never been easier than with the advent of wireless subject recording devices. Quality wireless products allow for accurate readings on a subject’s physiology in ways tethered devices cannot. Now with products like the Mobita wearable biopotential system, data logging is simpler than ever before. Mobita is a physiological signal amplifier system that can record up to 32 channels of high-fidelity wireless biopotential data, including ECG, EEG, EGG, EMG, and EOG data. The Mobita also contains an onboard accelerometer that allows for, along with AcqKnowledge’s Actigraphy feature, evaluation of a subject’s activity levels. 

Together with AcqKnowledge software, the system can be quickly configured to do the work of multiple systems without the added cost of multiple amplifiers. Simply disconnect one header and snap on a new configuration for a completely different application. The system has the option to either log data locally for later download or telemeter back to a computer running AcqKnowledge for real-time display. The Mobita can easily switch between either live or logged mode to suit your research protocol. Using the built-in WiFi telemetry allows for a wide range of mobile subject recordings. The system has flash disk recording for up to 16 GB allowing large chunks of data to be stored and kept for back-up. Mobita is also a very flexible, wearable system due to its technical power and small size. Don’t let the system’s small size and rechargeable battery power operation fool you—the Mobita has the power to record up to 32 channels at up to 2K s/s and is fully integrated with AcqKnowledge. The system features a rugged construction making it well suited for tough and demanding measurement situations. The Mobita system is sturdy, dustproof, and most importantly is kept safe in its waterproof enclosure. The Mobita is the premier wireless biopotential system that is uniquely suited for a variety of applications such as psychology, neuromarketing, sports, ambulatory testing, and many more. See Mobita Systems Biopotentials

EEG Data Acquisition

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BIOPAC offers a wide range of tools for recording and analyzing human or animal EEG signals. Available hardware includes the EEG100C amplifier, which amplifies bioelectric potentials associated with neuronal activity of the brain and can be used to perform unipolar or bipolar EEG measurements. The amplifier output can be switched between normal EEG and alpha wave detection. The 0.005 Hz HP setting will support Slow Cortical Potential measurement in the EEG. The Alpha detection mode outputs a smoothed wave with a peak indicating maximal alpha activity (signal energy in the 8-13 Hz frequency range).

EEG can now also be recorded from an MRI using the EEG100C-MRI smart amplifier. Data recording is easier and final results are cleaner when using the smart amplifier to derive EEG signals during fMRI or MRI. The unit incorporates advance signal processing to remove spurious MRI artifacts from physiological data. The MRI version of the EEG100C can still be sampled at the same rate as the normal amplifier during recording. This is because the MRI related artifacts are removed from the source, thus still leaving a perfectly recorded EEG signal. 

The amplifier includes a number of helpful features that improve derived EEG signals. There is less sensitivity to electrode and transducer lead placement and improved gain selectability. The unit minimizes computer based real-time or post-processing signal processing for faster data analysis. Cleaner data is available as a real-time analog output for easy analysis. The EEG100C-MRI contains the same functionality as the normal amplifier with the added compatibility with MRI cable and filter sets. 

AcqKnowledge provides powerful EEG analysis solutions. Use AcqKnowledge software to automatically filter raw EEG signal for Alpha, Beta, Theta, and Gamma wave activity and provide full frequency analysis of the data. AcqKnowledge contains powerful EEG analysis that provides a fully automated, epoch driven, analysis of the signal. The software also will remove any EOG artifacts from the signals. 

BIOPAC also offers a suite of wireless EEG solutions for mobile data recording. The Mobita, BioNomadix, and B-Alert X10 units all provide powerful wireless recording alternatives for EEG. The hardware allows for recording of EEG ranging from a single channel to up to 32 channels of data. Combined with AcqKnowledge software, the BIOPAC range of EEG recording products encompasses any need for in-lab recording, real-world and MRI applications. Learn more at EEG Applications http://www.biopac.com/eeg-electroencephalography

Noninvasive Cardiac Output | Data Acquisition

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Noninvasive Cardiac Output (NICO) measures can be determined by employing electrical bioimpedance (EBI) measurement techniques. Electrical bioimpedance is the characteristic impedance of a volume of tissue and fluid. For Cardiac Output measures, the relevant tissue includes the heart and the immediate surrounding volume of the thorax, and the relevant fluid is blood.
The electrical impedance of the thorax (Zt) can be thought of as composed of two impedance types:
  1. The base impedance (Zo) corresponding to non-time varying tissues, such as muscle, bone and fat. Zo is measured when the pulsatile volume is minimal.
  2. The delta impedance (dZ) corresponding to time-varying fluid volume (blood).
http://www.biopac.com/noninvasive-blood-pressure-amplifier-nibpZt drops with each pulsatile volume of blood ejected from the heart. dZ/dt is the magnitude of the largest impedance change during systole.
Noninvasive cardiac output amplifiers incorporate a precision high-frequency current source, which injects a very small (400 microamp rms) current through the measurement tissue volume defined by the placement of a set of current source electrodes. A separate set of monitoring electrodes measures the voltage developed across the tissue volume. Because the current is constant, the voltage measured is proportional to the characteristics of the biological impedance of the tissue volume.
BIOPAC data acquisition hardware for recording real-time Noninvasive Cardiac Output parameters include tethered amplifiers such as the NICO100C (or NICO100C-MRI for fMRI environments), EBI100C, or SS31L, or the wireless BioNomadix BN-NICO.
Hardware simultaneously measures impedance magnitude and phase, and may incorporate an internal derivative function to output dZ/dt simultaneously with Z; an AcqKnowledge calculation channel can also be used to determine dZ/dt. The internal derivative function inverts the polarity of the dZ/dt signal so that it displays a positive-going peak, coincident with negative slopes indicated in Z, as per academic research convention.
Disposable Ag/AgCl Paired Electrodes (EL500) are recommended for bioimpedance and cardiac output studies. Paired electrodes provide fixed spacing between the dual contacts and are pre-gelled with hypo-allergenic, wet liquid gel electrolyte (10% chloride salt); the gel cavity is situated between electrode and skin surfaces and helps reduce motion artifact.
The impact of movement artifacts on recorded data is a significant methodological concern in impedance cardiography; Ensemble Averaging tools in AcqKnowledge provide an automated strategy to remove these artifacts. Watch a demo now!

Data Hardware & Software Platforms

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Data acquisition hardware and software requirements vary widely based on experiment protocol, classroom setup, field studies, etc. BIOPAC data acquisition hardware platforms support wired, wireless, and fMRI setups, for human or animal subjects, with powerful, intuitive data software for research and teaching applications. Use with a variety of amplifiers, stimulators, triggers, transducers, gas analysis modules, and/or electrodes to acquire life science signals, including ECG, EEG, EOG, EMG, EGG, EDA, Respiration, Pulse, Temperature, Impedance Cardiography, Force, Accelerometry, Goniometry, Dynamometry, Gyro, and more. Combine data hardware for multi-subject or multi-parameter protocols.

Research hardware platforms are fully-integrated with AcqKnowledge® data acquisition software, which provides automated routines for data scoring, measurement, and reporting, and can support multiple hardware units. Teaching platforms include Biopac Student Lab software with media-rich tutorial style guide lessons for specified objectives, plus active learning options for student-designed experiments and advanced analysis.

Wired (tethered) data acquisition hardware platforms include the MP150 and MP36R Research Systems. The MP150 16-channel system with universal amplifier provides high resolution (16 bit), high-speed acquisition (400 kHz aggregate) with16 analog inputs and two analog outputs, digital I/O lines (to automatically control other TTL level equipment), and online calculation channels. The MP36R 4-channel research system with built-in amplifiers provides four analog inputs and one analog output, I/O port for digital devices, calculation channels, trigger port, headphone jack, and electrode impedance checker. The MP36R supports software-controlled amplifiers and calculation channels.

Wireless data hardware includes options for live or logged data:
BioNomadix wireless, wearable physiology monitoring devices noninvasively record high-quality, full-bandwidth data while comfortably allowing subjects to move freely in natural indoor environments. Digital transmission and transducers placed close to the signal source provide excellent signal quality. Record up to 16 channels of BioNomadix data with a BIOPAC MP150 System—the system also works with multiple MP150 systems or third-party data acquisition hardware via an isolated power supply module. 

Mobita® 32-channel wearable wireless systems are ideal for biopotential applications that demand subject mobility and data logging. The Mobita EEG System uses water electrodes—no skin prep or gels required. Record live data into AcqKnowledge or log to an internal storage card for later upload into AcqKnowledge; modes are easily switched to suit specific protocols.

B-Alert X10® Wireless Systems provide nine channels of high fidelity EEG plus ECG, and data software for cognitive state metrics software is available. The stand-alone system easily interfaces with MP150 Research System to synchronize with other physiological data.

BioHarness® with AcqKnowledge is a lightweight, non-restrictive data logger and telemetry system to monitor, record, and analyze a variety of physiological parameters, including ECG, respiration, posture, and acceleration.

Stellar® Small Animal Telemetry Licenses with AcqKnowledge control wireless data acquisition from Stellar Implantable Telemetry Systems. The easy-to-configure Animal Scheduler works for a subset or complete group of conscious, unrestrained small animals for long term recordings. Multiple display modes can be viewed simultaneously, and signal conditioning tools (e.g., filtering and artifact removal) can be applied.


These and other BIOPAC data hardware and software solutions are used in thousands of labs worldwide and cited in thousands of publications. Learn more about research systems and teaching systems.

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