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True RMS responding DMMs measure the "heating" potential of an applied voltage. Power dissipated in a resistor is proportional to the square of an applied voltage, independent of the wave shape of the signal. Today’s general purpose DMMs can accurately measures true RMS voltage or current, as long as the wave shape

I have an 89441A with several installed options. As a matter of principle, I would like to back up the instrument configuration in case I need to restore it someday due to a CPU or NVRAM failure. According to the service manual, there is a function in the service menu to do just this. Unfortunately, when I try to use this function I am unable to