Instrumentation
The mission carries two pointed instruments, the Proportional Counter Array (PCA) developed by GSFC to cover the lower part of the energy range, and the High Energy X-ray Timing Experiment (HEXTE) developed by UCSD covering the upper energy range. These instruments are equipped with collimators yielding a FWHM of one degree. In addition, RXTE carries an All-Sky Monitor (ASM) from MIT that scans about 80% of the sky every orbit, allowing monitoring at time scales of 90 minutes or longer. Data from PCA and ASM are processed on board by the Experiment Data System (EDS), also built by MIT.
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