[Isocops] IBEX CEU SOH check for Orbits 152-154. * RED LIMITS on V *

[Mark Tapley]

IBEX instrument teams,
	Still working; commanded and expected RED LIMITS continue on 
IBEX-Hi Negative Collimator Voltage.

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	For Arc 152a: Serious spin problems, first 1/3 of Arc. ACS 
telemetry shows star tracker completely off-line, recovering around 
midpoint of arc. As noted in previous report, IBEX-Hi Negative 
Collimator Voltage is commanded to -1400V which is beyond plot RED 
LIMIT of -1300V. IBEX-Hi ESA Voltage goes to zero once near beginning 
and once near end of arc, consistent with O-Mode operation as 
commanded. IBEX-Lo MCP Volt monitor shows 1 drop-out, near the end of 
a "fuzz lull" from Day 1.5 to 3. IBEX-Lo PAC Current monitor exceeds 
yellow limit for one sample during ramp-up, as it often does. 
Otherwise Nominal.

	For Arc 152b: No obvious spin problems. IBEX-Hi CEM Back 
Count goes to twice yellow limit at end of arc, with accompanying 
noise in IBEX-Hi Positive Collimator Current, IBEX-Lo TOF Positive 6V 
Volt Monitor, and Positive 12 Volt CEU Switch Current. IBEX-Hi ESA 
Voltage goes to zero once near beginning and once near end of arc, 
consistent with O-Mode operation as commanded. IBEX-Lo MCP Volt 
monitor shows 5 drop-outs, all during a "fuzz suppression" due to 
IBEX-Lo PMT Voltage set-back from Day 8.3 to 9.  IBEX-Lo PAC Current 
monitor exceeds yellow limit for one sample during ramp-up, as it 
often does. Otherwise Nominal.

	For Arc 153a: Serious spin problems, first 1/3 of Arc. ACS 
telemetry shows star tracker completely off-line, recovering after 
midpoint of arc. As noted in previous report, IBEX-Hi Negative 
Collimator Voltage is commanded to -1600V which is beyond plot RED 
LIMIT of -1300V. IBEX-Hi ESA Voltage goes to zero once near 
beginning, again ~10 hours later, and once near end of arc, 
consistent with O-Mode operation as commanded. Temperatures look 
consistent with two unscheduled contacts about Day 2 
(2012/01:19:00:00). IBEX-Lo MCP Volt monitor shows 3 drop-outs, 
between Day 1 and Day 2. Otherwise Nominal.

	For Arc 153b: No obvious spin problems. IBEX-Hi CEM Back 
Count shows lots of noise in the last half of the arc, exceeding 
yellow limit for a while around day 7.7. This is reflected in IBEX-Hi 
Positive Collimator Current, IBEX-Lo LV Current and Volt Monitors, 
IBEX-Lo TOF Positive 6V Volt Monitor, Positive 12 Volt CEU Switch 
Current, and (barely) several temperature and regulated voltage (e.g. 
IBEX-Lo TOF Positive 5V) monitors. Interestingly, the IBEX-Lo MCP 
Volt Monitor "fuzz" changes character during the high count period 
from low baseline with high "fuzz" to a high baseline with low 
"fuzz". IBEX-HI Total counts shouws very unique activity, with the _C 
trace and _B trace elevated well above the _A trace and all three 
consistently high for the second half of the arc. IBEX-Hi ESA Voltage 
goes to zero once near beginning, again ~10 hours later, and once 
near end of arc, consistent with O-Mode operation as commanded. 
Otherwise Nominal.

	For Arc 154a: No obvious spin problems, desipite ACS 
indicating star tracker offline for most of arc. IBEX-Hi Negative 
Collimator Voltage is commanded to -1600V which is beyond plot RED 
LIMIT of -1300V. IBEX-Hi ESA Voltage goes to zero once near 
beginning, again ~12 hours later, and once near end of arc, 
consistent with O-Mode operation as commanded. IBEX-Lo MCP Volt 
monitor shows 2 drop-outs, between Day 0.5 and Day 1.5. IBEX-Lo PAC 
Current monitor exceeds yellow limit for one sample during ramp-up, 
as it often does. An unusual "hump" appears in IBEX-Lo LV Current 
Monitor, IBEX-Lo LV Volt Monitor, IBeX-Lo TOF Positive 5V Current 
Monitor, IBEx-Lo TOF Positive 6V Volt Monitor (inverted), IBEX-Lo TOF 
Temperature (barely), and Positive 12 Volt CEU Switch Current from 
Day 1.8 to 3 or so; this appears most clearly in the IBEX-Hi Total 
Counts plot, which looks much like arc 153b. Otherwise Nominal.

	For Arc 154b: No obvious spin problems. IBEX-Hi ESA Voltage 
goes to zero once near beginning, again ~12 hours later, and once 
near end of arc, consistent with O-Mode operation as commanded. 
IBEX-Lo MCP Volt monitor shows 1 drop-out, \ Day 5.5. 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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