When recording the data into LabChart it is not possible to sum the raw Voltage values from the segment channels. This is because the MPVS Ultra provides individual gain and level shifting to convert the produced 0.4-8V signal to an output range of +/- 10V full scale. Therefore, in order to sum the individual outputs from the MPVS, each volume segment must be calibrated to mS or uL first.
In the attached example, the composite channel was calibrated using the conductance values (70.67mS and 232.4mS) provided in the Volume calibration in the MPVS Ultra Control interface. The individual volume segments were calibrated using the individual segment values (10.1mS and 33.2mS). The datafile illustrates the correct summation of the calibrated segmental volumes to equal the composite volume.