I do a self-calibration every six month or so which is enough for me as it takes about 40m.
This calibration procedure is from DS6000 calibration or not? Are You know what, specifically, calibration data will be erased when pressing the button ResumeCal? Can I do only "Equivalent Calibration" after this? Do you use when calibrating the DS6000-Cal-Kit? Are You bought the cable "BNC One-to-Five Cable" or did it yourself?
The extended calibration procedure of the DS4000 seems similar to what's listed in this DS6000 document, but because I don't have the equivalent instruction for the 4K, I never dared to do it.
The fact is, only the self-call is supposed to be accessible to the final user. We only access the extended menu because someone leaked the code sequence.
But so far, I never felt the need for anything else than the self-cal, because what is meant to be calibrated by the other procedures has always been spot-on on my scope.
All the offsets or metering errors I've had so far were always fixed by the self-cal.
I never tried to do a ResumeCal as self-cal never failed.
I bought the official Rigol's DS4K calibration kit from Batronix because it is so cheap that you cannot build it yourself for less, unless you recycle old connectors.
It is just 6 BNC-BNC cables and a BNC splitter on a PCB, totally equivalent and interchangeable with the one for the DS6K.