Sequoia / Tahoe Series User Manual California Instruments
2 M447352-01 REV-A
1.1 General Description
The SEQUOIA/TAHOE Series AC and DC power source systems are high efficiency, floor standing AC
and DC power sources that provide a precise output with low distortion. Available voltage ranges are 166
Vac, 333 Vac in AC and AC+DC modes and 220 Vdc, 440 Vdc in DC mode. The SQ0022/TA0022,
SQ0030/TA0030, SQ0045/TA0045, and SQ0090/TA0090 can operate in either single or three-phase
mode. All other models always operate in three-phase mode.
A wide range of AC and DC loads could be powered, including reactive loads (inductive and capacitive)
running at full rated apparent power, and non-linear loads drawing current with high crest factor, up to 5:1.
Multiple remote digital communications interfaces are available: standard LAN (Ethernet), USB, and
RS-232C, or the optional IEEE-488 (GPIB) interface. The SEQUOIA/TAHOE Virtual Panels GUI program
provides a convenient graphical user interface, and the SCPI command set allows access to the full
programmability and functionality. Extensive remote analog and discrete digital control interfaces are also
provided for specialized control applications. The front panel display has capability for control,
programming, and measurements of the power source, and features a menu-based interface with
touch-screen data/command entry.
Waveform generation includes standard sine wave and square wave, and extensive programmability to
produce complex waveforms based on harmonics or arbitrary parameter value/time relationships. A
transient generator could combine sequences of voltage, frequency, and wave shape to simulate
real-world AC or DC disturbances and automate a complex profile of power stimulus to the unit under test.
The power analyzer utilizes DSP-based digitization of output parameters to implement measurement
functions spanning single parameter values (voltage/current/frequency), power characteristics
(true/apparent power, crest factor, power factor), and advanced computation using Fast Fourier transform
(FFT) derivation of the harmonics and distortion contained in the voltage and current waveforms. Real-time
display of output waveforms is possible through the Virtual Panels GUI.
The SEQUOIA/TAHOE Series units are contained in a compact floor standing enclosure on casters. This
allows the units to be moved around more easily.
1.2 Key Benefits
1.2.1 Simple Operation
The Sequoia/Tahoe Series can be operated completely from its menu driven front panel controller. The
full color-touch display shows menus, setup data, and read-back measurements. RS232C, USB and LAN
remote control interfaces and instrument drivers for popular ATE programming environments are available.
This allows the Sequoia/Tahoe Series to be easily integrated into an automated test system. With the
programmable arbitrary waveform generator, the user can generate application specific waveforms, obtain
time and frequency domain measurements, and capture actual voltage and current waveforms.
1.2.2 Configurations
The Sequoia/Tahoe Series offers five single chassis configurations: 15kVA, 22.5kVA, 30kVA, 45kVA and
90kVA. For higher power requirements, multi-cabinet models are available. These systems offer Reflex
capability, allowing flexible user reconfiguration as needed. This ability to reconfigure the system greatly
expands your test coverage and is not commonly found in power systems.
1.2.3 Choice of Voltage Range
The Sequoia/Tahoe Series offers dual range 0 - 166V & 0 - 333V line to neutral direct coupled output.
These models provide a maximum 3 phase output capability of 287 VAC & 576 VAC line to line
respectively. For applications requiring more than 333 V L-N (or 576 V L-L), the optional -XVC444,
XVC555, XVC666, and XVC721 output transformer provides an additional output range for use in AC mode
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