Agilent Technologies MSO6012A User Manual page 52

Getting Started 1
5 You should see a waveform on the oscilloscope's display
similar to this:
If you see the waveform, but the square wave is not shaped
correctly as shown above, perform the procedure "To
compensate the oscilloscope probes" on page 52.
If you do not see the waveform, ensure your power source is
adequate, the oscilloscope is properly powered-on, and the
probe is connected securely to the front-panel oscilloscope
channel input BNC and to the Probe Comp terminal.
6000 Series Oscilloscope User's Guide 51