BayTech PS-4C Guide de dépannage télécharger pdf (Page 43)

Appendix 2: Readout Schematic

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Figure 7: Array Readout Timing. All 4 quadrants of the array are readout simultaneously; within one quadrant all 8

amplifiers are readout, with pairs of amplifiers multiplexed down into one A/D input. Thus in a frame time of 1.33

seconds 1024 × 256 pixels are readout. The image delivered by MCE4 for a CDS frame is the difference image from two

nondestructive reads of the array; the timing for a CDS frame with integration time of 6 seconds is shown. Note that the

total time to take this frame is 6 + 1.33 seconds, but the net integration time for all pixels is 6 seconds. The case for 3

multiple reads is also shown. For a 6 second integration this takes ~10 seconds. MCE4 delivers the difference image of

the sum of each set of 3 reads. Thus the final image with multiple reads is a coadded image; the pixel values will be 3

times larger than that obtained with a CDS read.

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BayTech PS-4C Guide de dépannage Page 43