[Isocops] IBEX CEU SOH check for Orbits 133-134 - interesting event

[Mark Tapley]

IBEX instrument teams,
	Still working, but wanted to get this out quick. There's a 
very unusual looking event day 8, showing large negative excursions 
on 3 power supply monitors. I'm guessing a bad telemetry packet, but 
we should maybe check to confirm this guess. If the values are large 
negative but not at the rails, we may want to investigate farther.

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

	For Arc 133a: No obvious spin problems. IBEX-Hi CEM Back 
Count exceeds yellow limits many times from day 1.7-3.2; the yellow 
excursions are faintly reflected in Positive 12 Volt CEU Switch 
Current. Otherwise nominal.

	For Arc 133b: No obvious spin problems. IBEX-Hi Positive 
Collimator Current shows some "fuzz" after day 7, reflected in 
Positive 12 Volt CEU Switch Current. IBEX-Hi ESA Voltage goes to zero 
multiple times after day 8.5, similar to a gain scan; the gain scan 
appears in IBEX-Lo MCP Current Monitor, Temperature, Volt monitor 
(accompanied by similar "fuzz" to Positive Collimator Current), and 
IBEX-Lo TOF MCP Current Monitor and Volt Monitor and MCP Voltage 
Setting. The same scan appears in IBEX-Lo TOF Positiev 6V Volt 
Monitor and Positive 12 Volt CEU Switch Current. Otherwise nominal.

	For Arc 134a: No obvious spin problems. Spin rate, CEU 
Temperature, and many other monitors all indicate an eclipse (lower 
temperatures and currents at MCP, very slight voltage reductions and 
very slight PS current increases) at day 2.2 or so. Otherwise nominal.

	For Arc 134b: No obvious spin problems. IBEX-Lo MCP Volt 
Monitor shows "fuzz" after day 7 or so; this also appears in Positive 
12 Volt CEU Switch Current. NOTE: Payload -12V PS Voltage, +5V PS 
Voltage, and +7.5V PS Voltage each show one very large drop-out, far 
beyond the red low (large negative voltage for -12V) limit; this is 
probably a telemetry packet error; all three events happen 
simultaneously at day 8. IBEX-Hi Total Counts shows some minor 
activity around Day 8.5. Otherwise Nominal.

-- 
						- Mark     210-379-4635
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