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The Cassegrain telescope of the UVS had a 250 mm aperture and collected light from the observation target.
Both the UVS and EUV instruments used a ruled grating to disperse this light for spectral analysis.
This light then passed through an exit slit into photomultiplier tubes that produced pulses or " sprays " of electrons.
These electron pulses were counted, and these count numbers constituted the data that were sent to Earth.
The UVS was mounted on Galileos scan platform and could be pointed to an object in inertial space.
The EUV was mounted on the spun section of the spacecraft.
As Galileo span, the EUV observed a narrow ribbon of space perpendicular to the spin axis.
The two instruments combined weighed about 9. 7 kilograms and used 5. 9 watts of power.

1.811 seconds.