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EPIC Calibration and Operation Meeting PN Open Points EPIC NCR Status
7th February 20 01 Fabio Giannini

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Summary
· PN Open Points · EPIC Status
­ MOS ­ p-n ­ RAD MON

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PN Open points
· OFFSET/NOISE Transmission current status ­ not possible to transmit them interleaved p er exposure due to EPEA too busy ­ currently in C AL CLOSED exposure the OFFSE T and NOISE are sent for CCD0s (more than 1h overhead) ­ SuperED contains OFFSET dump for all CCDs, but success rate very low (2-4 successful)

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PN Open points
· Proposal for more systematic download (medium term) ­ transmit all OFFSET at the beginni ng of every revol ution in the Activation Window (it will be the OFFSET calculated in the last
observation of previous revolution).

­ every TBD revo lution calculate OFFS ET and NOISE in FF and send the NOISE of all CCDs instead of the CAL CLOSED exposure (~2.5h). We may reduce this time to ~2.1h if we sy stematically perform FF Setup at the end of the Activation Window and remove thermal stabili zation (FW alway s in close or cal close position ). ­ Remove OFFSET/Noise dump from all other activities.

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PN Open points
· Proposal for more systematic download (long term) ­ transmit OFFSET and NOISE tables through the H BR interface ­ Requires EPDH S W change ­ Depending on the EPDH SW change the ground SW may also need to be change d

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EPIC Status · MOS OPEN Non Conformances
­ FIFO overflow causes data corruption ­ TM Headers and trailers do not match ­ MOS buffer manager / counting mode failure
· the above 3 NCR are to be closed with the REL-J of EMDH SW (to be delivered later this year)

­ MOS2 timing mode exposure with regul ar noise pattern
· Investigation still ongoing; Offset instability (fixed offset?), reset voltage change

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EPIC Status
· p-n OPEN Non Conformances
­ Command rejected
· Closed with REL-I of EPDH SW · possible procedural work-around to be tested on spare, but interleaved offset dump not possible · Fixed by on-ground SW

­ PN EPEA qu adrants do not alway s respond to TC

­ PN discarded line s packets wrong segmentation flag (minor) ­ Failure to reset EPEA on-board time counter
· New, under investigation; impact on science in long observation. Until now only found once.

· RAD MON OPEN Non Conformances
­ All closed by desperation

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EPIC Status
· MOS Major recent problems
­ Bright pixels in MOS 2 (July 2000). S ingle event, not dramatic. Corrected and regular monitoring bein g performed
(3x3 diagnostics and FF exp no BP and HBR threshold = 32767)

· p-n Major recent problems
­ Bright pixels/columns. Sing le event, dramatic effect due to fast readout. Corrected on-board, but some columns still degraded.

· RAD Major recent problems
­ Same as usual

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