Editing Rossi X-ray Timing Explorer (section)

=== Proportional Counter Array (PCA) ===
The Proportional Counter Array (PCA) provides approximately {{cvt|6500|cm2}} of X-ray detector area, in the energy range 2 to 60 keV, for the study of temporal/spectral effects in the X-ray emission from galactic and extragalactic sources.<ref name="Experiment2">{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=1995-074A-02 |title=Experiment: Proportional Counter Array (PCA) |publisher=NASA |date=28 October 2021 |access-date=28 November 2021}} {{PD-notice}}</ref> The PCA was an array of five proportional counters with a total collecting area of {{cvt|6500|cm2}}. The instrumental properties were:<ref name="HEASARC">{{cite web |url=https://heasarc.gsfc.nasa.gov/docs/xte/learning_center/pca.html |title=Proportional Counter Array (PCA) |publisher=NASA |date=2011-12-06 |access-date=2018-10-05}}</ref>

* Energy range: 2–60 keV;
* Energy resolution: <18% at 6 keV;
* Time resolution: 1 μs
* Spatial resolution: collimator with 1° (FWHM);
* Detectors: 5 proportional counters;
* Collecting area: {{cvt|6500|cm2}};
* Layers: 1 [[propane]] veto; 3 [[Xenon]], each split into two; 1 Xenon veto layer;
* Sensitivity: 0.1-mCrab;
* Background: 90-mCrab.

The PCA is being built by the Laboratory for High Energy Astrophysics (LHEA) at [[Goddard Space Flight Center]]. The principal investigator was [[Jean Swank]].<ref name="HEASARC"/>