Both LeCroy’s ERES (Enhanced Resolution) math operation and the Tektronix HiRes (High Resolution) acquisition mode are FIR (Finite Impulse Response) filters. Their function is to remove high bandwidth components of the signal and high bandwidth components of acquisition noise from a waveform. Beyond that basic similarity the two operations are completely different on both a mathematical and operational level. Differences Between ERES and HiRes APPLICATION BRIEF How Do They Work ? (ERES) November, 2011 ERES is a post-acquisition processing function available in many LeCroy oscilloscopes. The user controls the amount of filtering desired. In the Summary examples in Figure 1a and 1b, the dialog box in the lower right hand corner shows the user is requesting 2.5 additional bits of vertical Both LeCroy’s ERES resolution. The user can request 0.5, 1, 1.5, 2, 2.5 or 3 bits of enhanced (Enhanced Resolution) math resolution. Of course extra resol……