Apply a drop of gel to the electrode (but not so much as to spread and prevent it from sticking well); apply to pre-gelled disposable electrodes if they look dry or do not provide a strong signal.
Wait at least 5 minutes before starting the recording so that the gel can be absorbed into the skin; this will reduce the impedance.
Check the impedance level—use the “Electrode Check” built-in impedance checker on MP3X units, or add BIOPAC’s EL-CHECK to your recording protocol to measure the impedance between surface electrodes attached to a subject before you begin recording…then correct any noise issues before you begin to record great data!
EL-CHECK is suitable for measuring electrode contact impedance for all surface biopotential measurements, including those for ECG, EEG, EGG, EMG, EOG, Bioimpedance and Impedance Cardiography. The EL-CHECK permits simultaneous connection of up to three electrode leads, for quick impedance checking between any two electrodes.
As a rule of thumb, impedance levels below 10 kOhms are ideal, and the lower the better.
To prevent movement artifacts, use tape to attach the electrode leads to the skin. Unless recording fMRI/MRI, make a loop with the electrode lead cable under the tape to reduce the chance of dislodging the electrode due to a sudden pull.
Each amplifier has several gain settings. Use the highest gain setting possible which does not cause data to clip (data will clip when the signal is amplified so much that it goes beyond the -10 to +10 volt range of the system). High gain takes full advantage of the high resolution capability of the system and increases measurement sensitivity.
When calibrating a transducer, whenever possible use calibration values that encompass the range in which you will be recording. For example, if you are using a force transducer and anticipate working in the range 5 to 50 grams, use a 5 gram and a 50 gram weight for calibrating.
For airflow transducers, use flow rates that are similar to those you intend to record.
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Research posters presented at BIOPAC’s T4 physiology conference (Tools, Trends, Techniques, and Technology) exhibited leading physiological research utilizing BIOPAC’s technology. Research posters presented unique advances in neuromarketing and health research. The T4 conference, held at UCSB Monday, July 24, 2017 through Wednesday, July 26, 2017, showcased the latest trends in the Tech industry’s physiological research. […]
ABC News | Good Morning America | Excessive Cell Phone Use JULY 31, 2017 | Excessive cell phone use may cause anxiety, experts warn BIOPAC user Nancy A. Cheever, Ph.D. from California State University, Dominguez Hills was featured on Good Morning America. Her study investigated whether spending too much time on your phone may be causing people to feel […]