COS Cycle-21 Calibration Phase-1 Last Revised: 11/01/13 Proposal ID: 13533 Title: COS NUV MAMA Recovery after Anomalous Shutdown PI: T. Wheeler Co-I(s): A. Welty

COS Cycle
-
21

Calibration Phase
-
1


Last Revised:

11/01
/
13


Proposal ID:


13533

Title:

COS
NUV

MAMA
Recovery after Anomalous Shutdown

PI:

T. Wheeler

Co
-
I(s):

A. Welty


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

# Orbit
estimates are TOTAL for all of C
ycle
-
21


Total
Prime Orbits: n/a

External Parallel Orbits:

n/a

I
nternals or no
-
impact orbits: n/a

Comments on orbit estimate:


This is a contingency proposal only.

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

# This section should be written with a GO audience in mind
--

use

# Calibrat
ion plans in WFPC
-
2 handbook as a guide.


Purpose: This proposal is designed to permit the safe
and orderly recovery of
the COS/NUV
MAMA detector after an anomalous shutdown. This is accomplished
by using slower
-
than
-
normal MCP
and PC
high
-
voltage ramp
-
ups

and diagnostics.


Description: Anomalous shutdowns can occur
because

of bright object
violations, which

trigger the Global Hardware Monitor or the Global Software
Monitor. Anomalous shutdowns can also occur
because

of MAMA hardware
anomalies or failures. The cause of the shutdown should be thoroughly
investigated and understood prior to recovery. Twenty
-
four hour wait
intervals are required after each test for MCP gas
desorption

and data
analysis.
COS event flag 2 i
s

used to prevent inadvertent MAMA usage.


The recovery procedure consists of three separate tests

(i.e. visits)

to
check the MAMA’s health after an anomalous shutdown. Each must be
successfully completed before proceeding onto the next. This proposal
exec
utes the same
steps as Cycle 20 proposal 13129
.



(1) Signal processing electronics check. This reduces amplifier thresholds


to 0.28V and monitors the ORCOUNT rate. (MAMA HV is off during this


procedure)


(2)
Slow
, intermediate

voltage
HV

ramp
-
up. The
MCP and PC are

slow
-
ramped


with plateaus
to a
MCP
voltage 300V below nominal

and a PC voltage of


-
50V
.

A

dark time
-
tag exposure is taken during this partial ramp. A


second
time
-
tag

dark exposure is taken where the event coun
ter is cycled


through W, X, Y, Z, OR, EV and VE


(3)
Slow, full voltage
HV

ramp
-
up
.
The MCP and PC are slow
-
ramped with


plateaus to the full MCP and PC
operating
voltages.
As before, a dark


time
-
tag exposure is taken
during the ramp. A se
cond dark time
-
tag


exposure is taken where the event counter is cycled through W, X, Y, Z,


OR, EV and VE.

This is followed by and fold analysis test
(See COS

MAMA


Fold Distribution

for details
)
.


Accuracy: n/a



Comments on Accuracy:

n/a


Products:

n/a



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

# Link to c
ycle 21

Science

# Use the GO + GTO Phase 1 exposure listing and derived statistics

# posted on W
WW.


Fraction of science programs supported by this calibration: This is a
contingency procedure only.


List categories of science which can't be executed until after this proposal:


n/a

why: n/a


L
ist categories of science which are best performed contemporaneous with this
proposal: n/a

why:


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

# THE REST OF THIS FORM IS FOR INTERNAL USE

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

Observation summary: The recovery from an anomalous shutdown consists of
three tests: a signal pro
cessing electronics check, high
-
voltage ramp
-
up to
an
intermediate voltage and a h
igh
-
voltage ramp
-
up to the full operating
voltage followed by a fold distribution test. During each of the two high
voltage ramp
-
ups, time
-
tag exposures are taken and diagnostics are performed.
Post
-
ramp dark time
-
tags with diagnostics are also taken. The
final, full
ramp is followed by a fold distribution test.


# Target information (copy for each target)


Target Name. : n/a

RA. : n/a

Dec. : n/a

Flux (and unit
s). : n/a

Visibility window (if known or relevant): n/a

Comment on choice of target : n/a


# Exposure list plan at the Phase I level. Be as complete as reasonable.

# If possible information should be complete enough to al
low easy

# submission of a Phase 2 from this form. However, if you have to leave

# some of the fields blank below, or want to provide the information

# in another format, that is acceptable. (Make sure you do the BOP checking

# though, as this is a phase
-
1 issue.)


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

**** This list of exposures should be executed ONLY in the event of ****

****
an anomalous
COS/NUV MAMA shutdown

****

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

Note (1)

Bright Object Protection Considerations during the Visit 3 and Visit 6.

(a)

This proposal uses aperture/grating/lamp combinations which are


designed to produce count rate
s of ~1,000
-
2,000 count/sec. They should


not be changed without consultation with the P.I.


(b) During the execution of the fold analysis some anode folds are


disabled. Consequently, the OR counter does not provide a true


representati
on of the OR count and so the Software Global Monitor (SGM)


does not trigger until the enabled folds provide enough counts to the


OR counter to trigger the SGM's threshold. To compensate, while the


fold analysis is running th
e SGM thre
shold is reduced to 1
0,000 counts




in a 1.0 second interv
al, from its nominal value of 20,000 counts in a


0.1 second interval.


(c) For the reasons discussed in (b) and to prevent light from entering the


hub this test
should only be ru
n with the COS

external shutter closed.


Note (2)

Voltage ramping terms and polarity terminology.

With the COS NUV MAMA detector, the term ramp
-
up means to make the MCP or PC
more negative in applied voltage. Ramping down means heading towards 0V.


Table
of exposures (copy for each exposure as appropriate/desired):


Visit 1
, Exposure 1: Signal Processing Electronics Checkout
-

LV On

Target or lamp : Dark

Type of Acquisition : n/a

Detector for observatio
n

: COS/NUV

Operating mode : Data

Spectral Element : n/a

Aperture : n/a

Central Wavelength : n/a

Exposure Time


: 1005s

Number of Iterations : 1

BOP Predicted Local Count Rate for MAMA : n/a, no detector HV

BOP Predicted Global Count Rate for MAMA: n/a, no detector HV

ETC PID IDs for Count Rates : n/a

Special Requirements or options :
Special commanding

Comments:



Same alignment Sequence 1
-
3
.


Switch on LV power supply
.


Set

SGM Threshold = 10
000, Integration
Period

= 0.1 secs
.


Set amplifier threshold to default (0.48V)
-

Collect a minimum of 30


telemetry points
.


S
et amplifier threshold to

0.28V
-

Collect a minimum of 30

telemetry



Points.


Special commanding: Instruction =
ELHDTLVN_1
.


Visit 1
, Exposure 2: Signal Processing Electronics Checkout
-

LV Off

Target or lamp : Dark

Type of

Acquisition : n/a

Detector for observatio
n

: COS/NUV

Operating mode : Data

Spectral Element : n/a

Aperture

: n/a

Central Wavelength

: n/a

Exposure Ti
me : 3
0s

Number of Iterations : 1

BOP Predicted Local Count Rate for MAMA : n/a, no detector HV

BOP Predicted Global Count Rate for MAMA: n/a, no detector HV

ETC PID IDs for Count
Rates : n/a

Special Req
uirements or options :
Special commanding

Comments:


Special commanding: Instruction =
RLLVTHDN
.


Visit 1
, Exposure 3: Signal Processing E
lectronics Checkout
-

Set Flag 2

Target or lamp

: Dark

Type of Acquisition : n/a

Detector for observatio
n :
COS/NUV

Operating mode : Data

Spectral Elem
ent : n/a

Aperture

: n/a

Central Wavel
ength : n/a

Exposure Tim
e : 1
s

Number of Iterations : 1

BOP Predicted Local Count Rate for MAMA : n/a, no detector HV

BOP Predicted Global Count Rate for MAMA: n/a, no detector HV

ETC PID ID
s for Count Rates : n/a

Special Requirements or options : Special commanding

Comments:


Special commanding: Instruction =
ELFLAG2
.


Visit 2
, Exposure 1: Intermediate HV Checkout
-

LV On

Target or lamp : Dark

Type of Acquisition : n/a

Detector for observatio
n : COS/NUV

Operating mode : Data

Spectral Element : n/a

Aperture : n/a

Central Wavelength

: n/a

Exposure Time

: 60
s

Number of Iterations : 1

BOP Predicted Local Count Rate for MAMA : Special monitoring per ISR 98
-
03

BOP Predicted Global Count Rate for MAMA: Special monitoring per I
SR 98
-
03

ETC PID IDs for Count Rates : n/a

Special Requirements or options : Special commanding

Comments:



Sequence 1
-
6

Non
-
Int.


Must clear event flag 2

for the commanding to execute.


Switch on LV power supply.


Special

commanding: Instruction =
ELHDTLVN_2
.


Visit 2
, Exposure 2: Intermediate HV Checkout
-

Ramp HV to
-
1750V/
-
50V

Target or lamp : Dark

Type of Acquisition : n/a

Detector for observatio
n : COS/NUV

Op
erating mode : Time
-
Tag

Spectral Elemen
t : Default

Aperture

: Default

Central Wavelength : n/a

Exposure Time

: 1800
s

Number of
Iterations : 1

BOP Predicted Local Count Rate for MAMA : Special monitoring per ISR 98
-
03

BOP Predicted Global Count Rate for MAMA: Special monitoring per ISR 98
-
03

ETC PID IDs for Count Rates : n/a

Special Requirements or op
tions : Buffer
Time = 20
00



Special commanding

Comments:


The MCP and PC Voltage partial Ramp
-
ups will be performed in stages. The


ramp
-
up within a stage is by increments of
-
50V. The final MCP volta
ge


will be
-
1750V, 300V shy of the nominal value of
-
2050V. The final PC


Voltage will be
-
50V, rather than the nominal
-
800V setting. Use the


nominal yellow and red ramping

limits
. At the end of each stage,

reset


the SGM to a Threshold
= 100 and an Integration Period = 0.1 sec,

and


collect telemetry samples of OR Counts for 4 minutes. The COS rate is 1


TLM sample/10 secs; ~24 samples will be obtained.


Stage 1
-

MCP
ramp
-
up (0 to
-
500V)


Stage 2
-

MCP ramp
-
up
(
-
50
0V to
-
1000V)


Stage 3
-

MCP
ramp
-
up (
-
1000V to
-
1500V)


Stage 4
-

MCP
ramp
-
up (
-
1500V to
-
1750V)


Stage 5
-

PC V
oltage ramp
-
up (+20 to
-
50V)


Special commanding: Instruction =
ELHVPART2
.


Visit 2
, Exposure 3: Intermediate HV
Checkout
-

Cycle SGM

Target or lamp : Dark

Type of Acquisition : n/a

Detector for observatio
n

: COS/NUV

Operating mode


: Time
-
T
ag

Spectral Element

:

Default

Aperture

: Default

Central Wavelength : n/a

Exposure Time

: 570
s

Number of Iterations : 1

BOP Predicted Local Count Rate for MAMA : Special monitoring

per ISR 98
-
03

BOP Predicted Global Count Rate for MAMA: Special monitoring per ISR 98
-
03

ETC PID IDs for Count Rates : n/a

Special Requirements or options :
Buffer Time = 720



Special

commanding

Comments:


S
et SGM Threshold = 2
00
, Integration
Period

= 0.1 secs
.


Collect minimum 5 samples W events
.


Collect minimum 5 samples X events
.


Collect minimum 5 samples Y events
.


Collect minimum 5 samples Z events
.


Collect minimum 5 samples OR events
.


Collect minimum 5 samples EV events
.


Collect minimum 5 samples VE events
.


Special commanding: Instruction =
ELHVDARK2
.


Visit

2
, Exposure 4: Intermediate HV Check
out
-

HV Off

Target or lamp

: Dark

Type of Acquisition : n/a

Detector for observatio
n : COS/NUV

Operating mode : Data

Spectral Element : n/a

Aperture


: n/a

Ce
ntral Wavelength : n/a

Exposure Time

: 250
s

Number of Iterations : 1

BOP Predicted Local Count Rate for MAMA : Special monitoring per ISR 98
-
03

BOP Predicted Global Count Rate for MAMA:
Special monitoring per ISR 98
-
03

ETC PID IDs for Count Rates : n/a

Special Requirements or options : Special commanding

Com
ments:


Ramp down detector.


Special commanding: Instruction =
ELHVTLVN_2
.


Visit 2, Exposure 5:
Intermediate HV Checkout
-

LV Off

Target or lamp : Dark

Type of Acquisition : n/a

Detector for observatio
n : COS/NUV

Operating mode : Data

Spectral Element

: n/a

Aperture


: n/a

Central Wavelength : n/a

Exposure Time

: 30s

Number of Iterations : 1

BOP Predicted Local Count Rate for MAMA :
n/a

BOP Predicted
Global Count Rate for MAMA:
n/a

ETC PID IDs for Count Rates : n/a

Special Requirements or options : Special commanding

Comments:


Turn LV off
.


Special commanding: Instruction =
RLLVTHDN
.


Visit 2, Exposu
re 6: Intermediate HV
Checkout
-

Set Flag 2

Target or lamp : Dark

Type of Acquisition : n/a

Detector for observatio
n : COS/NUV

Operating mode : Data

Spectral Element :
n/a

Aperture


: n/a

Central Wavelength : n/a

Exposure Time

: 1s

Number of Iterations : 1

BOP Predicted Local Count Rate for MAMA :
n/a

BOP Predicted Global Coun
t Rate for MAMA:
n/a

ETC PID IDs for Count Rates : n/a

Special Requirements or options : Special commanding

Comments:


Set Flag 2
.


Special commanding: Instruction =
ELFLAG2
.


Visit 3
, Exposure 1: Full High Voltage Test
-

LV On

Ta
rget or lamp : Dark

Type of Acquisition : n/a

Detector for observatio
n

: COS/NUV

Operating mode : Data

Spectral Element : n/a

Aperture

: n/a

Central Wavelength : n/a

Exposure Time

: 60
s

Number of Iterations : 1

BOP Predicted Local Count Rat
e for MAMA : n/a

BOP Predicted Global Count R
ate for MAMA:

n/a

ETC PID IDs for Count Rates : n/a

Special Requirements or options : Special commanding

Comments:



Sequence 1
-
6

Non
-
Int.


Switch on LV power supply
.


Must clear event flag 2

for the commanding to execute
.


S
pecial commanding: Instruction =
ELHDTLVN_3
.


Visit 3
, Exposure 2: Full High Vol
tage Test
-

Ramp HV to
-
2050V/
-
8
00V

Target or lamp : Dark

Type of Acquisition : n/a

Detector for observ
ation :
COS/NUV

Operating mode : Time
-
Tag

Spectral Element

: Default

Aperture

: Default

Central Wavelength : n/a

Exposure Time

: 3090
s

Num
ber of Iterations : 1

BOP Predicted Local Count Rate for MAMA : Special monitoring per ISR 98
-
03

BOP Predicted Global Count Rate for MAMA: Special monitoring per ISR 98
-
03

ETC PID IDs for Count Rates : n/a

Special
Requirements or op
tions : Buffer_Time = 33
00



Special commanding

Comments:


Special NUV HV turn on & slow full ramp up. The MCP and Field Voltage


Ramp
-
ups will be performed in stages. The ramp
-
up wit
hin a stage is by


increments of 50V. Use the nominal yellow and red limits for ramping. At


the end of each stage, reset the SGM to a Threshold = 100 and an


Integration Period = 0.1 sec, an
d collect telemetry samples of OR

Counts


for 4 m
inutes. The COS rate is 1 TLM sample/10 secs; ~24 samples will be


obtained.


Stage 1
-

MCP
ramp
-
up (0 to
-
500V)


Stage 2
-

MCP
ramp
-
up (
-
500V to
-
1000V)


Stage 3
-

MCP
ramp
-
up (
-
1000V to
-
1500V)


Stage 4
-

MCP
ramp
-
up
(
-
1500V to
-
1750V)


Stage 5
-

PC V
oltage ramp
-
up (+20 to
-
50V)


Stage 6
-

MCP
ramp
-
up (
-
1750V to
-
1850V)


Stage 7
-

MCP
ramp
-
up (
-
1850V to
-
1950V)


Stage 8
-

Fina
l MCP ramp
-
up (
-
1950V to
-
2050V)


Stage 9
-

Final PC Voltage

ramp
-
up (
-
50V t
o

-
800V)


Special commanding: Instruction =
ELHVPART3
.


Visit 3
, Exposure 3: Full High Voltage Test
-

Cycle SGM

Target or lamp : Dark

Type of Acquisition : n/a

Detector for observatio
n

: COS/NUV

Operating mode


: Time
-
T
ag

Spectral Element

: Default

Aperture

: Default

Central Wavelength : n/a

Exposure Time

: 45
0s

Number of Iterations : 1

BOP Predicted Local Count Rate for MAMA : Special monitoring per ISR 98
-
03

BOP Predicted Global Count Rate for MAMA: Special monitoring per ISR 98
-
03

ETC PID IDs for Count Rates
: n/a

Special Requirements or options :
Buffer Time = 720



Special

commanding

Comments:


Set SGM Threshold = 200
, Integration
Period

= 0.1 secs


Collect 5 samples W dark events


Collect 5 samples X
dark events


Collect 5 samples Y dark events


Collect 5 samples Z dark events


Collect 5 samples OR dark events


Collect 5 samples EV dark events


Collect 5 samples VE dark events


Special commanding: Instruction =
ELHVDARK3
.


Visit

3
,
Exposure 4: Intermediate HV Checkout
-

HV Off

Target or lamp : Dark

Type of Acquisition : n/a

Detector for observatio
n : COS/NUV

Operating mode : Data

Spectral Element

: n/a

Aperture

: None

Central Wavelength : n/a

Exposure Time

: 355
s

Number of Iterations : 1

BOP Predicted Local Count Rate for MAMA : Spec
ial monitoring per ISR 98
-
03

BOP Predicted Global Count Rate for MAMA: Special monitoring per ISR 98
-
03

ETC PID IDs for Count Rates : n/a

Special Requirements or options : Special commanding

Comments:


Ramp down detector,

HV off
.


Special commanding: Instruction =
ELHVTLVN_3
.


Visit

3
, Exposure 5: Intermediate HV Checkout
-

LV Off

Target or lamp : Dark

Type of Acquisition : n/a

Detector for observatio
n : COS/NUV

Operati
ng mode : Data

Spectral Element : n/a

Aperture : n/a

Central Wavelength : n/a

Exposure Time

: 30s

Number of Iterations

: 1

BOP Predicted Local Count Rate for MAMA : Special monitoring per ISR 98
-
03

BOP Predicted Global Count Rate for MAMA: Special monitoring per ISR 98
-
03

ETC PID IDs for Count Rates : n/a

Special Requirements or options : Specia
l commanding

Comments:


Turn LV off
.


Special commanding:
Instruction =
RLLVTHDN
.


Visit

3
, Exposu
re 6: Intermediate HV Checkout
-

Set Flag 2

Target or lamp : Dark

Type of Acquisition : n/a

Detector for ob
servatio
n : COS/NUV

Operating mode : Data

Spectral Element : n/a

Aperture

: None

Central Wavelength : n/a

Exposure Time

: 1s

Number of Iterations : 1

BOP Predicted Local Count Rate for MAMA :
n/a

BOP Predicted Global Count Rate for MAMA:
n/a

ETC PID IDs for Count Rates : n/a

Special Requirements or options :
Special commanding

Comments:


Set Flag 2
.


Special commanding: Instruction =
ELFLAG2
.


Visit 4, Exposure 1
: Full High Voltage Test
-

Fold Test Setup

Target or lamp : Dark

Type of Acquisition : n/a

Detector

for observatio
n : COS/NUV

Operating mode : Data

Spectral Element : n/a

Aperture : n/a

Central Wavelength : n/a

Exposure Tim
e

: 2
0s

Number of Iterations : 1

BOP Predicted Local Count Rate for MAMA : Note (1)

BOP Predicted Global Count Rate for MAMA: Note (1)

ETC PID IDs for Count Rates :

Special Requireme
nts or options
:
Special
Commanding

Comments:


Sequence 1
-
2 Same
-
Alignment.


Set SGM Threshold =
15000, Integration Period = 0.1
s
ecs.


Special commanding: Instruction =
ELFOLDSET
.


Visit 4, Exposure 2
: Full High Voltage Test
-

Fold Test

Target or lamp

: D2
-

Medium

Type of Acquisition : n/a

Detector for observatio
n : COS/NUV

Operating mode

: Time
-
Tag

Spectral Element

: G185M

Aperture


: FCA

Central Wavel
ength : 1850

Exposure Time : 2300s

Number of Iterations : 1

BOP Predicted Local Count Rate for MAMA : Note (1)

BOP Predicted Global Count
Rate for MAMA: Note (1)

ETC PID IDs for Count Rates :

Special Requirements or options :
Buffer Time = 2300


Special
c
ommanding

Co
mments:


Set SGM Threshold = 10
,
0
00
, Integration
Period

= 1.0
secs

(a) Collect counter samples during flat field illumination


Collect 60 sec

W

events


Collect 60 sec

X

events


Collect 60 sec

Y

events


Collect 60 sec

Z

events


Collect 60 sec

OR

events


Collect 60 sec

EV events


Collect 60 sec

VE

events

(b) Disable MAMA Folds: C2, C3, C4, C5, C6, R2, R3, R4, R5, R6

(c) Conduct fold analysis


Collect 60 sec

VE for following 19 combinations of MAMA folds:


(1) Enabled: C2, R2; Disabled: C3, C4, C5, C6, R3, R4, R5, R6


(2) Enabled: C2
, R3; Disabled: C3, C4, C5, C6, R2, R4, R5, R6


(3) Enabled: C3, R2; Disabled: C2, C4, C5, C6, R3, R4, R5, R6


(4) Enabled: C2, R4; Disabled: C3, C4, C5, C6, R2, R3, R5, R6


(5) Enabled: C3, R3; Disabled: C2, C4, C5, C6, R2, R4, R5, R6


(6) Enabled: C4, R2; Disabled: C2, C3, C5, C6, R3, R4, R5, R6


(7) Enabled: C3, R4; Disabled: C2, C4, C5, C6, R2, R3, R5, R6


(8) Enabled: C4, R3; Disabled: C2, C3, C5, C6, R2, R4, R5, R6


(9) Enabled: C3, R5; Disabled: C2, C4, C5, C6, R2, R3, R4, R6


(10) Enabled: C4, R4; Disabled: C2, C3, C5, C6, R2, R3, R5, R6


(11) Enabled: C5, R3; Disabled: C2, C3, C4, C6, R2, R4, R5, R6


(12) Enabled: C4, R5; Disabled: C2, C3,

C5, C6, R2, R3, R4, R6


(13) Enabled: C5, R4; Disabled: C2, C3, C4, C6, R2, R3, R5, R6


(14) Enabled: C4, R6; Disabled: C2, C3, C5, C6, R2, R3, R4, R5


(15) Enabled: C5, R5; Disabled: C2, C3, C4, C6, R2, R3, R4, R6


(16) Enabled: C
6, R4; Disabled: C2, C3, C4, C5, R2, R3, R5, R6


(17) Enabled: C5, R6; Disabled: C2, C3, C4, C6, R2, R3, R4, R5


(18) Enabled: C6, R5; Disabled: C2, C3, C4, C5, R2, R3, R4, R6


(19) Enabled: C6, R6; Disabled: C2, C3, C4, C5, R2, R3, R4, R
5

(d) Enable MAMA folds C2, C3, C4, C5, C6, R2, R3, R4, R5, R6


at completion of exposure.

(e) Check lamp stability by checking EV and VE


Collect 60 sec

events (EV) to check lamp stability


Collect 60 sec

Valid Events (VE) to check lamp stability

(f) Turn off D2

lamp

(g) Collect event counter data for detector dark count rate


Collect 60 sec W

dark events


Collect 60 sec X

dark events


Collect 60 sec Y

dark events


Collect 60 sec Z

dark events


Collect 60 sec OR

dark events


Collect 60 sec

EV dark events


Collect 60 sec VE

dark events

(h) At completion of procedure reset SGM to nominal operating level


Special commanding: Instruction =
ELFOLDTST


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

# Special needs of this proposal?

This propo
sal is run to reactivate the COS

MAMA following an anomalous
shutdown.


Scheduling: As needed


Prerequisites: (e.g., specific SMOV propo
sal; command development?)


PDB update? (Specify table name if known e.g. SIAF).

On
-
board table update? (Specify table name if known e.g. CCDBadPixelTable)


# Special Requirements:

Real time? Y

Special commanding? Y

Qu
ick Data turn
around? Y (time
-
tags

and engineering telemetry)

Special timing required? N

Other? N

Describe (& justify) special requirements: The engineering telemetry for each
step is required to evaluate the safety for proceeding.


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

# Analysis Plan per Anomalous Shutdown


Expected FTE weeks for analysis: 0.4

Required turnaround on analysis (weeks): 0.2 per
test

Data volume (Mb needed for analysis): n/a

Special software needed for analysis
? (Describe): The
Engineering Team possesses special COS software used for the fold analysis


Description of analysis Plans: (1
-
2 par
agraphs)


Analysis is carried out by the Engineering Team within 24 hours of each test
in the checkout.
The engineering telemetry data is examined (voltages,
currents, temperatures, relay position, status, and event counts) for
agreement with predicted val
ues from previous ground and on
-
orbit tests or
model
-
predicted values.

The
darks and
time
-
tag images are examined for unusual spatial or t
emporal
features.