# BIOPAC

For the BIOPAC system, AcqKnowledge is the software used to record, analyze and export the data. This is an example of an export file of AcqKnowledge 5. The file contains information about the sample interval. In this case the sample interval is 2 ms.

The following picture shows the Import Profile Definition window in EthoVision XT for a BIOPAC AcqKnowledge 5 file.

The header contains information about the sample interval (milliseconds), and information about the channels. In this example, the ECG, heart rate, the R-R interval and R-peak height were measured.

The sample rate is calculated based on the sample interval. In this case the samples are taken at an interval of 2 milliseconds. This corresponds to a sample rate of 500 Hz.