Candidate CCDs are screened to characterize optimum performance. From the inventory of screened devices 4 flight and 1 backup unit will be chosen. Screening is done under nearly identical conditions; -90 c using the XIS-2 engineering electronics running the seqi (maximum parallel clock voltage) version sequencer.
| CCD | Noise RMS (e-) | CTI @ 5.9 keV (10 -6) | Dark Current (e-/sec) | FWHM @5.9 keV (eV) | FWHM @525eV | |
| w206c2 | 1.5 - 1.7 | 0.3 - 1.0 | 0.04 - 0.05 | 125.7 - 127.5 | 42.3 - 44.1 | |
| w280c1 | 1.6 - 1.8 | < 0.6 | 0.01 - 0.13 | 124.6 - 127.0 | 44.1 - 45.0 | |
| w283c1 | 1.6 - 1.8 | < 0.4 | 0.03 - 0.04 | 125.3 - 128.1 | 44.1 - 45.5 | |
| w285c1 | 2.4 - 2.5 | <0.6 | nill | 127.5 - 129.6 | 41.9 - 42.7 | |
| w292c2 | 1.7 - 2.1 | <0.2 | 0.05 - 0.07 | 124.6 - 126.7 | 42.2 - 43.0 | |
| w328c1 | 3.8 - 4.3 | <2.1 | 0.55 - 0.59 | 138.4 - 147.9 | 64.3 - 70.7 | |
| w328c2 | 3.5 - 4.1 | <1.7 | 0.14 - 0.17 | 133.8 - 137.7 | 55.2 - 59.9 | |
| w328c3 | 3.7 - 4.0 | <1.6 | 0.14 - 0.17 | 134.4 - 138.3 | 59.2 - 62.7 | |
| w333c1 | 3.4 - 3.7 | nill | 0.25 - 0.27 | 131.3 - 133.8 | 56.9 - 60.2 | |
| w335c3 | 5.1 - 5.9 | nill | 0.11 - 0.17 | 141.1 - 146.5 | 58.3 - 67.7 | |
| w340c2 | 4.0 - 4.3 | <0.6 | 0.11 - 0.13 | 134.5 - 139.7 | 59.0 - 63.0 | |
| w404c4 | 3.0 - 3.3 | <0.6 | 0.12 - 0.16 | 132.5 - 135.2 | 51.7 - 52.9 | |
| w445c2 | 2.3 - 2.5 | 0.01 - 2.0 | 0.08 - 0.10 | 128.1 - 136.3 | 46.3 - 49.6 | |
| w447c2 | 2.8 - 3.1 | 0.01 - 1.4 | 0.11 - 0.16 | 129.7 - 136.1 | 48.7 - 52.7 | |
| w411c1 | 3.7 - 4.2 | 7.7 - 34.0 | 0.09 - 0.11 | 145.7 - 162.1 | 60.9 - 66.1 | |
Dark Maps at -90 c
Scale
<-- 0.0 linear to 0.4 e-/sec -->
w206c2
w280c1
w283c1
w292c2
w328c1
w328c2
w328c3
w333c1
w335c3
w340c2
w404c4
w445c2
w447c2
w411c1