To better understand the background emission characteristics of the new SS mFPD device relative to the quartz tube mFPD prototype, the properties of each were investigated under the same multi-flame conditions. For this, measurements of background emission intensity were performed with both devices under the respective optimal conditions for measuring S2* response and compared. Consistently, it was found that the overall background current measured in the new SS mFPD was approximately 50%lower than that measured in the quartz tube mFPD. Visually this could also be readily affirmed.