14.4 Electrical Testing Plan
471
Table 14.3 Test coverage design for scientific payload
Test mode
OBDH
computer
1553B bus
Data
transmission
channel
Payload
controller
Payload operation
mode
Mode 1
Backup
Backup
Primary
Primary
Payload 1 in
operation alone,
payload 2 and
payload 3 in
operation together
Mode 2
Backup
Backup
Primary
Primary
Payload 3 in
operation alone,
payload 2 and
payload 1 in
operation together
Mode 3
Backup
Backup
Primary
Primary
Payload 2 in
operation alone,
payload 3 and
payload 1 in
operation together
Mode 4
Primary
Primary
Primary
Primary
Payload 1, payload
2 and payload 3 in
operation together
(1)
Mode 5
Backup
Backup
Primary
Primary
Payload 1, payload
2 and payload 3 in
operation together
(1)
Mode 6
Backup
Backup
Primary
Primary
Payload 1, payload
2 and payload 3 in
operation together
(1)
Mode 7
Backup
Primary
Backup
Backup
Payload 1 in
operation alone,
payload 2 and
payload 3 in
operation together
Mode 8
Backup
Primary
Backup
Backup
Payload 3 in
operation alone,
payload 2 and
payload 1 in
operation together
Mode 9
Backup
Primary
Backup
Backup
Payload 1 in
operation alone,
payload 2 and
payload 3 in
operation together
(continued)