The ornamental design for a sedrateinstrument, as shown and described.
FIG. 1 is a perspective view of an SED rate instrument in accordance with the subject disclosure.
FIG. 2 is a front view thereof.
FIG. 3 is a rear view thereof.
FIG. 4 is a left side view thereof.
FIG. 5 is a right side view thereof.
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines in FIGS. 1-7 show portions of the SED rate instrument that form no part of the claimed design. Additionally, in FIG. 7 the unshaded surfaces in between the solid and broken lines form no part of the claimed design.