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Purpose of "Load" in Scopy signal generator configuration GUI

Category: Software
Product Number: ADALM2000
Software Version: 1.4.1

What does the "Load(Ohms)" input box in the configuration GUI for the signal generator in Scopy (version 1.4.1) do?  When should it be set to something other than "Inf"?  I measure that the analog outputs have an output impedance of about 50 Ohms.  Does this setting change something?  Here is a picture of the input box.

By the way, despite occasional Scopy crashes, I like it and the ADALM2000 very much.  Most Scopy settings are self-evident.  It is a sign of good interface design.