BIOPAC® Systems, Inc. Logo

B-Alert “Use B-Alert Definition File” generates error

B-Alert in AcqKnowledge 4.4.1 and earlier: Attempting to record data after disabling the “Use B-Alert Definition File” option generates an “acquisition cannot continue” error message.

This issue can occur under the following circumstances:

  1. Launch AcqKnowledge and create a B-Alert graph.
  2. Select B-Alert > Set Up Data Acquisition > Length/Rate and verify that a definition file has been assigned.
    Assign B-Alert Definition File
  3. Uncheck the “Use B-Alert Definition File” box and close the acquisition setup dialog.
  4. A “Brain state definition file is required for one of the selected channels” message appears. Dismiss this dialog by clicking OK.
  5. Click the Start button.
  6. A second message appears: “There is an error with calculation channel C0. The acquisition cannot continue.”

This error occurs because when a definition file is assigned, calculation channels C0-C7 are automatically enabled to accommodate the Brain State Gauge data. If the “Use B-Alert definition file” is subsequently disabled, these calculation channels remain active even though the definition file is no longer being referenced. If this issue occurs, the following work-arounds are available:

A. Enable the “Use B-Alert Definition File” option and rerun the acquisition.
B. If the definition file is not to be used, disable calculation channels C0-C7 prior to recording:

Spotlight On
Cardiac Output amplifier

NICO Smart Amplifier

The NICO Smart Amplifier is specifically designed to measure thoracic impedance for performing noninvasive cardiac output measurements. The amplifier terminates in two connectors for impedance (Z) and its derivative (dZ), and has a 3 m cable that connects directly to an AMI100D Amplifier Input Module. Use with EL526 strip electrodes and CBL246 adapter or with EL500 […]

View All
Latest News

New Citations | BIOPAC’s AcqKnowledge Software

BIOPAC tools are used for studies in a variety of different fields and disciplines. AcqKnowledge software is one of our universally applicable tools, used by thousands of labs around the world and cited in thousands of peer reviewed publications, such as the following studies… The psychophysiology of guilt in healthy adults. Cognitive, Affective, & Behavioral Neuroscience, 1-18. […]

New Citations | BIOPAC in Human Physiology and 4T|Phys Recap

We had the opportunity to meet lots of researchers at our 4T|Phys Human Physiology Conference this month and demonstrate solutions for life science studies. We presented 39 unique skills sessions, including sessions on measuring blood pressure, recording HRV, and utilizing VR. These studies all apply these skills and further demonstrate how to apply our equipment… Real-Time Personalized Physiologically […]

Read All
Request a Demonstration
Request a Demonstration