[Isocops] IBEX CEU SOH check for Orbits 155-158.

Mark Tapley mtapley at swri.edu
Thu Mar 29 15:15:59 EDT 2012


IBEX instrument teams,
	Almost caught up.

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	For Arc 155a: No data first part of Arc, and in fact data 
only appears for Day 8.2 - 8.6. No obvious spin problems. IBEX-Hi 
Positive Collimator Current shows a very large ramp-up transient (0.6 
Amp (mAmp?) compared to normal 0.3 or less). IBEX-Lo PAC Current 
Monitor also shows a ramp-up transient above the yellow limit. Most 
temperatures are recovering from "cold" to normal operating ranges 
during the data span shown. Not really nominal, but all values within 
limits and approaching nominal by end of Arc.

	For Arc 155b: No data at all. Note Arc 155a data actually 
covers end of Arc 155b period.

	For Arc 156a: Spin problems around first day or so, starting 
after a brief gap in data and recovering within ~12 hours. ACS data 
shows tracker outage in later part of orbit, but spin phase looks 
good in data there. IBEX-Hi ESA Voltage goes to zero at beginning and 
end of Arc and around day 1.2 and 1.9, consistent with O-mode 
commands. IBEX-Lo MCP Volt monitor shows a single drop-out Day 2.5, 
and "fuzz" through Day 1.6 reflected as usual by Positive 12 Volt CEU 
Switch Current. Otherwise Nominal.

	For Arc 157a: Spin problems last Day or so, reflected in ACS 
data showing star tracker going to 10% or less. Otherwise Nominal.

	For Arc 157b: Serious spin problems first day or so. ACS 
shows FractionValid down around 20% during this time, returning 
slowly by end of Day 2. IBEX-Hi ESA voltage goes to zero about Day 
6.8. There is no O-mode commanding, so hopefully this is just a 
measurement drop-out. It is closely coincident with the second 
post-apogee radio contact, so there might be a connection with the 
radio activity. IBEX-Lo MCP Volt monitor shows a single drop-out Day 
6.5, and "fuzz" from Day 6.5 on reflected as usual by Positive 12 
Volt CEU Switch Current. Otherwise Nominal.

	For Arc 158a: No obvious spin problems. Missed PPS appears in 
new plots, steadily incrementing from ~80 to ~110 during the course 
of the orbit, with max. consecutive at 1. Otherwise Nominal.

	For Arc 158b: No obvious spin problems in "general status" 
plot, but it doesn't last long. ACS plots indicate decreasing 
FractionValid, but only down to 20% or so. Housekeeping plots only 
run days 4.7 to 6, presumably due to ramp-down for solar activity. 
IBEX-Hi Total Counts Exceeds yellow limits day 5.6 - 5.8, again 
presumably due to solar activity. Otherwise Nominal.


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...based on data at http://ibex.unh.edu/ibexhome/id-leops/status/ in 
appropriate directories.
-- 
						- Mark     210-379-4635
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