Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 3
only. Line- Line voltage for XVC444, XVC555, XVC666, and XVC721 is 769 V, 961 V, 1153V and 1248 V
respectively. For custom applications, the user defined XVC option is available.
1.2.4 High Crest Factor
With support for high crest factor loads, the Sequoia/Tahoe can drive difficult nonlinear loads with ease.
Since many modern products use switching power supplies, they tend to pull high repetitive peak currents.
The SQ0030/TA0030 with a crest factor rating of 4.5, for example, can deliver up to 300 Amps of repetitive
peak current (166 V AC range) per phase to handle three phase loads. Refer to Section 2 for peak repetitive
currents for each model.
1.2.5 Remote Control
Standard RS232C, USB, and LAN, along with optional IEEE-488 remote control interfaces, allow
programming of all instrument functions from an external computer. The popular SCPI command protocol
is used for programming.
1.2.6 Hardware in the Loop
The External Drive (-EXTD) feature allows external analog signal control of the source while in AC
operation, turning the source into a high bandwidth amplifier. Most common applications include hardware
in the loop (HIL) simulation of power plants, hybrid electric vehicles, and renewable energy generation and
their effect on the utility grid. Combining an HIL simulator with the Sequoia/Tahoe grid simulator results in
as little as 100uS delay, meaning the overall solution is real time.
1.3 Testing Applications
1.3.1 Power Conditioning Equipment Testing
With the ever-increasing demand for electrical power, power quality is becoming a global challenge and
many power conversion solutions, whose functionalities are grid-interactive, should be thoroughly tested
to ensure product performance and reliability. Thanks to the flexibility offered by Sequoia/Tahoe Series, it
is now possible that a single solution can support a wide variety of roles within your test setup, including
AC/DC Programmable Power source, AC/DC Grid Simulator, or AC/DC Resistive or Complex Electronic
load for Sequoia Series and only AC/DC Programmable Power source for Tahoe Series. With the ability
to change most parameters during the test and the ability to synchronize the waveform with internal and
external, Sequoia/Tahoe provides multiple methods of validation for R&D Testing.
1.3.2 Grid Interactive Green Energy and Distributed Power Generation (only for Sequoia Series)
Global initiatives for green electrical energy generation are accelerating, and the number of devices that
can export power to the grid in a distributed manner are on the rise. The Sequoia Series can uniquely act
as an ideal grid, regenerating current from PV Inverters, Wind Turbines etc., with nearly complete power
recovery. With seamless switchover between source and sink mode or its ability to program parallel RLC,
Sequoia can emulate the test conditions mandated by international standards like IEC 61727 and IEC
62116.
1.3.3 Avionics and Shipboard Electronics Testing
Optional test suites for avionics power quality standards like MIL-STD 704, RTCA DO-160, and MIL STD
1399 shipboard power bus emulation save time in creation of test cases and help to quickly pre-validate
the product compliance. With fundamental frequency support up to 905Hz with the high frequency (HF)
option, Sequoia/Tahoe can simulate a wide array of electrical power supplies in most aircrafts and
shipboard electrical systems. With the ability to sink power from DC to 500Hz incoming frequency and
programmability of load current waveform, the optional eLoad (only present in Sequoia Series) mode is
your solution for validating onboard power conversion systems.
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