Sequoia / Tahoe Series User Manual California Instruments
74 M447352-01 REV-A
4. Operation
The Sequoia / Tahoe Series power supply provides extensive functionality and programmability, which
could be utilized through the front panel, remote digital interface, and the remote analog/digital control
interface. The front panel includes a graphical, touch-screen display utilizing a menu-driven interface for
simplified operation of the unit and quick access to sophisticated functions. The remote interfaces provide
expanded control capability and access to the full functionality of the power supply. The following sections
explain the Operating modes available in Sequoia/ Tahoe Source and the remote I/O and analog
interfaces.
4.1 Operating Modes
4.1.1 Source Mode
In the Source mode, Sequoia / Tahoe acts as a power source and energy flows from the facility AC input
to the Unit Under Test (UUT) as shown in Figure 4-1. In this operating mode, the user can program output
voltage with the following possible regulation settings. The default operating mode is source mode.
1. Constant Voltage/ Constant Current: Output voltage is regulated as per the user-set value; on
reaching the current limit, the power supply regulates at the programmed current limit.
2. Constant Voltage/ Current Limit: Output voltage is regulated as per the user-set value; on reaching
the current limit, the power supply output voltage is programmed to zero.
Sequoia/Tahoe units when operating in source mode, will generate an error message if more than 20% of
available power (per phase) is regenerated by the load. The AC source will shut off if the negative power
reaches 30% of the available power.
Figure 4-1: Source Mode
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