Sequoia / Tahoe Series User Manual California Instruments
228 M447352-01 REV-A
PHASE: Causes the acquisition to trigger on the occurrence of
zero phase angle of the output voltage. When started, the
acquisition holds until the zero phase angle occurs, before trig
gering the acquisition. This mode allows the exact
positioning of the acquisition data window with respect to the
voltage waveform.
DELAY HARMONICS menu: Selects the time delay to position the trigger
point relative to the acquisition window. A negative value will
provide pre-trigger information on data leading up to the trigger
event. The pre-trigger delay cannot exceed the length of the
acquisition buffer, for details. A positive trigger delay positions the
data window after the trigger event. Positive trigger delays can
exceed the length of the acquisition buffer in which case the
trigger event itself will not be in the buffer anymore. The
maximum value of the trigger delay is 1000 ms. The default
trigger delay value is 0.0 ms which puts the trigger event at the
beginning of the acquisition window.
PHASE HARMONICS menu: Selects the output phase (Phase-A, Phase-
B, or Phase-C) for the harmonic measurement.
START HARMONICS menu: Starts a new acquisition run. When the start
field is selected, and after the trigger event occurs, the display
changes to the data display mode that was selected in the VIEW
field of the HARMONICS menu; refer to Figure 5-235. To return
to the HARMONICS menu, tap the HOME button while on the
data display screen.
Harmonics Table View: This function displays the frequency spectrum of the output
voltage or current waveform (selected by the Function selection
field) derived through FFT (fast Fourier transform) analysis. The
frequency spectrum is listed in tabular format, ranging from the
fundamental through the 50
th
harmonic, in five groups of ten
harmonics; refer to Figure 5-236. The groups are selected
through the use of the Right and Left arrow buttons. Each
harmonic has the following parameter data: harmonic number,
amplitude, and phase angle. Refer to Section 6.2.2 for additional
information on the harmonics tabular view.
Figure 5-236. HARMONICS Menu, Table View
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