Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 253
8. Transient Programming
8.1 Voltage Transient Programming
Voltage transient programming is applicable only for the source and grid simulator operation. It provides
precise timing control over output voltage and frequency changes. This mode of operation can be used to
test a product for susceptibility to common AC and DC power conditions such as surges, sags, brownouts,
and spikes. By combining transient list programming with custom waveforms complex AC or DC conditions
can be simulated on the output of the power source. Refer to Section 5 for specifics on using the display
menus to program the transients from the front panel. The full capability of transients programming could
be accessed through the remote digital interface using SCPI commands or the Sequoia Virtual Panels
GUI; refer to the Sequoia Series Programming Manual M447353-01, Tahoe Series Programming Manual
P/N M445374-01 or refer to AMETEK PPD website, www.programmablepower.com, to download the latest
version.
8.1.1 Using Transient Modes
Output transients are used to:
Synchronize output changes with a particular phase of the voltage waveform.
Synchronize output changes with internal or external trigger signals.
Simulate surge, sag, and dropout conditions with precise control of duration and phase.
Create complex, multi-level sequences of output changes.
Create output changes that have rapid or precise timing requirements.
The following power source functions are subject to transient control:
AC output voltage
DC output voltage
Frequency
Start phase angle
AC and DC voltage slew rate
Frequency slew rate
The following transient modes can be generated using the Sequoia Virtual Panels GUI or SCPI commands:
Step Generates a single triggered output change.
Pulse Generates an output change which returns to its original state after some time
period.
List Generates a sequence of output changes, each with an associated dwell time or
paced by triggers.
Fixed Turns off the transient functions; with SCPI commands, only the IMMediate values
are used as the data source for a particular function.
Figure 8-1 shows a representation of programming changes in the transient modes, and the output
waveform that is generated in each mode.
When a trigger is received in Step or Pulse modes, the triggered functions are set from their SCPI
command, IMMediate, to their TRIGgered value. In Step mode, the triggered value becomes the
immediate value. In Pulse mode, the functions return to their immediate value during the low portion of
the pulse. If there are no further pulses, the immediate value remains in effect. In List mode, the functions
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