Regardless whether I type it or select it by mouse, the data range is declared invalid by Measure. It doesn't seem to matter whether I select one or ten cells. I am using a DMM and a TRIG SGL command to acquire measurement data on resistance decades. The commands are validated by the fact that I use them verbatim in Fluke MET/CAL with repeatable and reliable results. The spreadsheet is also validated by the fact that it has been in continuous use for this purpose for several years, albeit manually populated. What is the secret to entering a data range in the Measure Task Dialog which Measure will accept? The HELP files and manuals all refer to "the section on Ranges" for answers, but ther exists no such "section" that I can find.