Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 249
Figure 7-1. HARMONICS Menu
2. Scroll to the FUNCTION field and select VOLT or CURRENT.
3. Scroll to the VIEW field and select the TABLE or BAR display mode.
4. Scroll to the DATA field and select ABSOLUTE or RELATIVE. The ABSOLUTE display format will
show all harmonic components in volts or amps. The RELATIVE display format will use the
fundamental as a 100% reference and display all harmonics as a percentage of the fundamental.
Phase angles are always shown with respect to the fundamental frequency.
5. Tap the MODE field and select SINGLE or CONTINUE. The SINGLE mode will acquire the data
once and show the result, while the CONTINUE mode will update the data continuously.
6. Tap the SOURCE field and select IMMEDIATE; alternate trigger mode is PHASE.
7. Tap Phase-A, Phase-B, or Phase-C button to select which output phase would be analyzed.
8. Tap the START field to start the analysis. The display mode that was selected will be opened and
the results displayed. If the trigger mode, CONTINUE, was selected, the data will be continually
updated.
9. To return to the HARMONICS menu, tap the UP arrow button. To display the data in a different
format, the selections may be changed as desired, and a new acquisition executed by tapping the
START button.
7.2.3 Analyzing FFT Data
The FFT results could be displayed for the entire data set using either tabular or graphical formats. For
tabular display, the harmonics are presented in five groups with ten harmonics per group. The LEFT and
RIGHT arrow buttons could be used to scroll through the data vertically; refer to Figure 7-2.
Figure 7-2. FFT data in Tabular Format
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