Transcript 11/22/04 - Meeting (ppt)

GLAST LAT Project
22 Nov 2004
GLAST LAT System Engineering
Gamma-ray Large
Area Space
Telescope
LAT Test Configurations
Rich Baun
SLAC
[email protected]
(650) 926-3520
LAT System Engineering
GLAST LAT Project
22 Nov 2004
Why Test Configurations?

LAT Level testing must, among other things, verify:
– The correct function of all LAT primary and redundant units
– The correct function of all interfaces between LAT primary units, LAT
redundant units,and the Spacecraft
– The correct function of all copper paths within the LAT and from the
LAT to the Spacecraft
– Provide at least 250 hours (TBD) of on time for each LAT unit

Establishing Test Configurations accomplishes the verification of unit
functions and their interfaces
– Configurations selected so that each unit and it’s prime, redundant, and
cross-strapped interfaces are verified
– Sufficient testing performed in each configuration to verify the proper
function of each unit
• Performance testing is done mainly in the all prime configuration
• Cross-strapped configurations have significantly fewer test
procedures executed as only interfaces/copper paths are verified
– Test configurations minimize unit power cycles and provide test
repeatability and configuration control

LAT Level testing will require 6 separate configurations to verify all unit
functions and interfaces (see next slide)
LAT System Engineering
2
GLAST LAT Project
22 Nov 2004
Proposed LAT Test Configurations
Config
No.
SC-P
SC-R
1
2
3
4
5
6
On
On
On
On
On
On
-
SIU-P
Feed
On
On
On
SIU-R Pri Htr
Feed
Feed
On
On
On
On
On
On
-
Red
Htr
On
On
On
On
-
On
-
LAT System Engineering
SIU-P
On
On
On
LAT UNITS ON
SIU-R GASU- GASU- EPU-P0 EPU-P1 EPU-R Towers
P
R
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
ACD
= Unit is powered On in the LAT Configuration(s) specified
= Unit is powered Off in the LAT Configuration(s) specified
3
On
On
On
On
On
On
+Y
HCB
On
On
On
On
On
On
-Y
HCB
On
On
On
On
On
On
PDU-P PDU-R
On
-
On
On
-
On
On
On
GLAST LAT Project
22 Nov 2004
LAT Configurations vs. Interfaces Verified
Device
SC-P
SC-R
SIU-P Feed
SIU-R Feed
SIU-P
SIU-R
GASU-P
GASU-R
EPU-P0
EPU-P1
EPU-R
Towers
ACD
Htr-P Feed
Htr-R Feed
+Y HCB
-Y HCB
SIU-P
1,6
3
1,3,6
-
1
-
INTERFACES VERIFIED
SIU-R GASU-P GASU-R EPU-P0 EPU-P1 EPU-R Towers
4
1,6
4
2,5
5
2,3
2,4,5
1,6
3
5
2,4
1,5
1,6
5,6
1,5,6
3,4
2,3
2,4
2,3,4
-
3
-
ACD
1,4,6
2,3,5
1,5,6
2,3,4
-
+Y HCB -Y HCB PDU-P
1,4,6
1,4,6
1,4
2,3,5
2,3,5
3
1,3,6
1,3,6
1,3
2,4,5
2,4,5
4
1
3,4
1,3,4
1,3
4
1,3,4
1,3,4
1,3,4
1,3,4
2,5,6
2,5,6
1,3,4
1,3,4
= Interface verified by CPT in LAT Configuration(s) specified
= No direct electrical interface between specified units or redundant table entry
Notes:
1) SC-P indicates all primary SC-LAT electrical signals, excluding power feeds
2) SC-R indicates all redundant SC-LAT electrical signals, excluding power feeds
LAT System Engineering
4
PDU-R
6
2,5
6
2,5
5,6
2
5
2,6
2,5,6
2,5,6
2,5,6
2,5,6
2,5,6