NASA ATS-ES (Attitude Sensor System-Earth Sensor) test panel, measuring 19 x 5.25 x 10, with front panel featuring 76 red and black inputs for "Test Functions," "Test Monitor," and "Functional," male and female serial ports to right, and lower portion lined with switches and knobs relative to "Sun Position," mode and count, manual reset, scan plane and angle adjustments, and sensor power; strip of tape to "Functional" section annotated "Sun offset, volt," a direction used to measure test voltages from satellite to ensure whether payload was functioning. Back panel features an additional 39 inputs. Right side of panel bears original TRW Systems parts label, which reads: "AS/ES Test Panel, PN X258408, Ser. No. BB, Contr. No. NAS-5-11609." In very good to fine condition, with scattered scuffs and wear from use. The Attitude Sensor System was a subsystem that consisted of several types of sensors used in combination to determine the position of the satellite with respect to the local vertical within one degree. The ATS-E attitude sensors include a solar aspect sensor system, one infrared Earth sensor, a polarized antenna (supplementary) and a commercial (525 lines) television camera.
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