I want to make sure that the trace “Type” is set to “Clear & Write” and not averaging when you make the noise marker measurement. Trace averaging will interfere with the noise marker measurement. The trace average control is located in the Trace control panel in the upper left of the Spike application.
With Clear & Write you should no longer be seeing a different between a 100/100 or 100/10 measurement. Can you verify this?
Can you also provide which version of Spike you are using?
