Keysight Technologies N778-C Series User Manual page 23

Getting Started 2
When the instrument is in stand-by mode, the Power LED is orange. When
the instrument is powered-on, the Power LED is green.
The AC power requirements are summarized on the rear panel of the
instrument.
Figure 4 AC Power Requirement Markings
Keysight N778-C Series Polarization Instruments User's Guide 23