At my university, I'll be using the ELENCO S-1325 oscilloscope for a instrumentation lab. Since I'm a mechanical engineering student and not an electrical engineering one, I don't know exactly how to use all the functions though I am familiar with the basic use and operation of it. However, I want to know how to use some of the more complex functions of the oscilloscope.
On an oscilloscope, why would anyone move the variable knobs off their “calibrated” positions? the variable knobs (red VAR knob) for voltage measurements? the small gray “var sweep” knob for the time base?
Isn't it a good thing to keep things calibrated rather than use uncalibrated settings?