[Isocops] IBEX CEU SOH check for Orbits 119-130b

[Mark Tapley]

IBEX instrument teams,
	Harald has inspired me. If he can get that far behind and 
catch up, who knows what I might be able to do? So, here goes with 
CEU trending. Starting where I left off:



	For Orbit 119 (yeah, that appears to be where I left off. 
That would be about 11 months ago, if you were so churlish as to keep 
count...): No obvious spin problems. CEM 1 current and voltage, 
IBEX-HI TOF voltage, and IBEX-HI ESA Voltage reflect a gain-scan 
looking thing around day 1.1.
	IBEX-LO PAC current has crept closer  to its 25-Amp 
(milli-Amp, I'm guessing) yellow-line since my reference orbit, Orbit 
37. Both quiescent and operating currents seem to be higher by ~ 
1(m?)A.


	For Orbit 120: No obvious spin problems. CEM4 set to higher 
(negative) voltage, shows in IBEx-HI CEM Voltage. IBEX-Lo MCP volt 
monitor has "fuzz" on it except for a period including day 3-3.5 or 
so, and a couple of minor dropouts. The fuzz is reflected in the 
Positive 12 Volt CEU switch current (as often happens).

	For Orbit 121: A few minutes of spin problems near beginning 
of orbit, then lots of star-tracker noise (down to ~10% computed 
fraction valid) near end of orbit. Nevertheless, spin estimate looks 
stable except for a very brief span near beginning of orbit, where 
error may go up around 10 degrees. IBEx-Hi CEM 4 voltage setting 
continues more negative than the others; I'll stop noting that 
until/unless it changes again. Unusually, IBEx-HI Temperature does 
not seem to reflect an apogee contact. IBEX-Lo MCP volt and current 
monitors, IBEX-Lo TOF MCP Volt Monitor, and MCP Voltage setting show 
what looks like a voltage scan early in the orbit.

	For Orbit 122: Computed Fraction Valid dips for first 2 days 
of orbit, but remains always above ~40%; no obvious problems in spin 
phase or axis error estimates. IBEX-Hi Positive Collimator Current 
shows an off-scale spike at turn-on, almost certainly a single-point 
measurement. Again, IBEx-HI Temperature does not seem to reflect an 
apogee contact. IBEX-Lo MCP volt monitor has "fuzz" on it except for 
a few hours during Day 6. The fuzz is reflected in the Positive 12 
Volt CEU switch current.

	For Orbit 123: No obvious spin problems. Everything else looks nominal.

	For Orbit 124: No obvious spin problems. IBEX-Lo MCP volt 
monitor has "fuzz" on it except for a few hours during Days 4 and 5. 
The fuzz is reflected in the Positive 12 Volt CEU switch current.

	For Orbit 125: Looks like spin problems late in the orbit. SS 
Voltage seems to "slide" down a bit, and Rotation error plot is well 
off the (12 degree) scale; at the same time Computed Fraction Valid 
dips below 10%. IBEX-Lo PAC Current Monitor spike above its yellow 
limit (which is very close to its static value) at start-up, probably 
a single reading.

	For Orbit 126: No obvious spin problems. IBEX-Lo MCP volt 
monitor has "fuzz" on it except for a few hours during Day 4. The 
fuzz is reflected in the Positive 12 Volt CEU switch current.

	For Orbit 127: No obvious spin problems. NOTE: Background 
count goes through the red limit many times early in Day 1 and almost 
reaches the yellow limit late in day 7. At end of orbit, many systems 
go to 0 V (preparatory to orbit Delta-V).

	For Orbit 128: No PL data, Delta-V maneuver operations.

	For Orbit 129: No PL data, Delta-V maneuver operations.

	For Orbit 130: No PL data, Delta-V maneuver operations (but 
See orbit 130a and 130b).

----- Starting here, trending data is carefully matched to instrument 
on/off times. This is not ideal because it's now hard or impossible 
to see turn-on/turn-off transients. -----

	For Orbit 130a: No obvious spin problems. IBEX-Hi CEM Back 
Count slightly exceeds yellow limit around day 2.8. IBEX-Lo PAC 
Current Monitor has an unusual asymptotic slope to the final 
operating current during the first day; this may be 
temperature-related, as the system warms up after a 2-orbit 
power-down, and does match the PAC temperature warm-up time.

	For Orbit 130b: No obvious spin problems. IBEX-Lo MCP Volt 
Monitor shows "Fuzz" almost throughout arc b. As usual, this is 
reflected in Positive 12 Volt CEU Switch Current.





-- 
						- Mark     210-379-4635
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