Thanks for that.
But what I am wanting to know is when the state of the output is in High Impedance or OFF. In most cases, people misunderstood that when you set a source to 0 volts doesn't mean turning it OFF. It is still ON with an output voltage of 0 volts.
Being in high impedance or output OFF state would mean that the analog output of 6251 is not sourcing, even 0 volts. Take for example a Keithley sourcemeasure unit. It has a GPIB command to set the output OFF.
With this, is there a way to set an analog voltage output of 6251 to OFF?