[Isocops] IBEX CEU SOH check for Orbits 143-145.

Mark Tapley mtapley at swri.edu
Mon Mar 19 18:15:15 EDT 2012


IBEX instrument teams,
	Still working. Only about 13 orbits behind now.

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	For Arc 143a: No obvious spin problems. IBEX-Lo MCP Volt 
Monitor shows "Fuzz" as usual, up to day 1.9 and day 2.7-4 or so, 
with the suppression coinciding with PMT voltage reduction. This fuzz 
pattern is reflected in Positive 12 Volt CEU Switch Current, as 
usual. IBEX-Hi ESA Voltage goes to zero momentarily just after start 
and before end of orbit (possibly O-mode transition). Otherwise 
Nominal.

	For Arc 143b: No obvious spin problems. ESA Voltage goes to 
zero momentarily just after start and before end of orbit (possibly 
O-mode transition). Otherwise Nominal.

	For Arc 144a: No obvious spin problems. IBEX-HI Positive 
Collimator Current elevated and noisy for first .1 hour or so. ESA 
Voltage goes to zero momentarily just after start and before end of 
orbit (possibly O-mode transition). Otherwise Nominal.

	For Arc 144b: No obvious spin problems. ESA Voltage goes to 
zero momentarily just after start and before end of orbit (possibly 
O-mode transition). Around Day 7.5, there is a brief surge in IBEX-HI 
CEM Back Count. This is reflected in several parameters, including 
IBEX-Hi Positive Collimator Current (dimly), IBEX-Lo Positive 
Collimator Current, IBEX-Lo IFB Temperature (dimly), IBEX-Lo LV 
Current Monitor, IBEX-Lo LV Temperature, IBEX-Lo LV Volt Monitor, 
IBEX-Lo MCP Temperature, IBEX-Lo TOF Positive 5V Current Monitor, 
IBEX-Lo TOF Positive 6V Volt Monitor, IBEX-Lo TOF Temperature, and 
Positive 12V CEU Switch Current. Otherwise Nominal.

	For Arc 145a: Serious spin problems, drifting days 2-3 and 
then returning suddenly. All ACS parameters reflect problems, with 
ValidFraction going toward zero during most of the bad period. Around 
Day 1, there is a slight elevation of IBEx-Hi Positive Collimator 
Current, accompanied by IBEX-Lo LV Current Monitor, IBEX-Lo LV Volt 
Monitor, and Positive 12 Volt CEU Switch Current and a slight 
reduction in IBEX-Lo TOF Positive 6V Volt Monitor. Otherwise Nominal.

	For Arc 145b: No obvious spin problems.  ESA Voltage goes to 
zero momentarily just after start and before end of orbit (possibly 
O-mode transition). Otherwise Nominal.


--------------------


...based on data at http://ibex.unh.edu/ibexhome/id-leops/status/ in 
appropriate directories.
-- 
						- Mark     210-379-4635
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Large Asteroids headed toward planets
inhabited by beings that don't have
technology adequate to stop them:

				Think of it as Evolution in Fast-Forward.


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