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Power Supply Operating States
44 Operating Manual for Multichannel Functionality (GPIB-M)
Power Supply Operating States
The power supply has 5 operating states:
• Power-On
• Output Shutdown
• Soft Start
• Normal Operation
• Calibration
Power-On This is the period between the time that AC power is applied to the supply (AC
breaker turned on) and the time that the power supply is ready for operation. During
this period, the internal circuits are powering up and performing self-tests. At the end
of the Power-On period, the supply is normally in its default Power-On mode with
the output OFF, V
SET
=0 and I
SET
=0.
Output
Shutdown
In this state, the output is disabled and there is no output regardless of power settings.
The power supply can be placed in the Output Shutdown state by a command (or the
the front panel - XFR, XHR only), via the Interlock signal, or from a protection
mechanism. This is also called the Standby mode.
Soft Start In this state, the output power is ramping up gradually towards its target load. This
reduces equipment stress. This state occurs whenever the supply output is enabled
by the software (a command or a protection is cleared), and is approximately 2
seconds in duration. See “Slew Rate” on page 67 to change the properties of the
ramp.
Normal
Operation
This is the normal operating state for the power supply. The power supply is ready
to accept commands.
Calibration This is a service mode that is used to calibrate setpoints and readback levels for
accuracy. Calibration should only be performed by qualified service personnel.