Make sure amplifiers are not set to the same channel—even if some of the amplifiers are not used.
Check the switch on top of each amplifier (for some amplifiers the switch is in the front because they use multiple channels).
Calibrate and scale the signals (MP Menu > Set Up Channels).
Set the sample rate(s) and recording length (MP Menu > Set Up Acquisition).
Adjust the display scales so the data is visible (Display menu > Autoscale waveforms).
Use correct ground and avoid ground loops.
To record EDA/GSR with other biopotential signals (ECG, EEG, EOG, EGG, EMG, ERS), BIOPAC recommends using CBL205 connected to one ground on any of the biopotential amplifiers. The subject will be grounded through the Vin- of the EDA electrodes, but in some cases it is necessary to have more than one ground; in such cases, use an AC-coupled lead adapter (CBL205) to prevent ground loops.
For example, if, while recording a biopotential and EDA/GSR you have to remove the EDA electrode during a stage of the experiment, you will still want to have a ground for the biopotential. Connect the Vin- lead of the EDA as ground, and connect an AC-coupled ground to the biopotential amplifier. The result is that you will always have a ground and no ground loops.
Ground loops can be a problem when using any two of the following amplifiers at the same time: EDA100C (or GSR100C), EBI100C, or NICO100C, but there are setup options if absolute measurements (i.e., SCL) are required:
Use two wired amplifiers (EDA100C/GSR100C with NICO100C) with a single MP150 System by adding the Isolated power supply IPS100C, interface amplifier HLT100C, isolator OUTISO, and cable CBL100.
Use a single MP150 system and opt to record EDA/GSR wirelessly and Cardiac Output wired.
Use two MP150 systems, with one of the two units connected to each system or two BioNomadix amplifiers.
Offering the industry’s only system that delivers a comprehensive, 24-hour data logging solution in an easy-to-use, easy-to-wear package, the BioNomadix Logger® truly delivers “physiology anywhere.” The BioNomadix Logger is the perfect tool for applications that demand greater degrees of subject freedom and complex experimental design. BioNomadix Loggers wirelessly record physiological data as subjects freely and naturally […]
Correlating Driver Fatigue and Altitude Change In ongoing efforts to make our roads ever safer, frequent studies are published researching driver fatigue. In this study, researchers used wearable Eye Tracking technology and recorded eye movement, blink rate, and other physiological signals with the BIOPAC MP160 Data Acquisition Unit. The purpose of the study was to […]
BIOPAC’s just released Introductory ECG Guide addresses fundamental to advanced concerns to optimize electrocardiography data recording and analysis. Topics include: ECG Complex; Electrical and Mechanical Sequence of a Heartbeat; Systole and Diastole; Configurations for Lead I, Lead II, Lead III, 6-lead ECG, 12-lead ECG, precordial leads; Ventricular Late Potentials (VLPs); ECG Measurement Tools; Automated Analysis Routines […]