top - download
⟦0aed7b02a⟧ Wang Wps File
Length: 2327 (0x917)
Types: Wang Wps File
Notes: INTERN MEDDELELSE NO. 275
Names: »1652A «
Derivation
└─⟦0c861a53d⟧ Bits:30006079 8" Wang WCS floppy, CR 0122A
└─ ⟦this⟧ »1652A «
WangText
…02…
…02…SRA/820203…02……02…#
INTERN MEDDELELSE NO. 275
…02……02…CAMPS
To: LSN, GB, ASM, GJ, FE, URH, OE, FC
From: BHB/SRA
S̲u̲b̲j̲e̲c̲t̲:̲ ̲A̲m̲b̲i̲e̲n̲t̲ ̲t̲e̲m̲p̲e̲r̲a̲t̲u̲r̲e̲ ̲c̲o̲n̲d̲i̲t̲i̲o̲n̲s̲ ̲f̲o̲r̲ ̲C̲A̲M̲P̲S̲
1. C̲A̲M̲P̲S̲ ̲R̲E̲Q̲U̲I̲R̲E̲M̲E̲N̲T̲S̲.̲
Ambient temperature: 10…0e…o…0f…C. - 40…0e…o…0f…C.
Rate of change : max. 10…0e…o…0f…C./hour.
Altitude : 0 - 2000m.
2. S̲U̲G̲G̲E̲S̲T̲E̲D̲ ̲I̲N̲T̲E̲R̲N̲A̲L̲ ̲C̲R̲ ̲S̲T̲A̲N̲D̲A̲R̲D̲.̲
a) All modules are functionally tested at 65…0e…o…0f…C.
b) Module MTBF is calculated at T…0f…amb…0e…= 43…0e…o…0f…C.
c) At sealevel (0m) the maximum average temperature
increase (T…0f…av-inc(0)…0e…) and the maximum peak
temperature increase (T…0f…i-inc(0)…0e…) above a crate
with forced cooling shall be (refer to the
figure below):
T…0f…av-inc(0)…0e… = (T1+T2+T3+T4)/4 - T…0f…amb…0e… =
15…0e…o…0f…C.
T…0f…i-inc(0)…0e… = 20…0e…o…0f…C. (i = 1, 2, 3, 4).
Top of D crate
T1 T2 T3 T4
̲x̲ ̲ ̲ ̲ ̲ ̲ ̲x̲ ̲ ̲ ̲ ̲ ̲ ̲x̲ ̲ ̲ ̲ ̲ ̲ ̲x̲ ̲
Rear of Front of
D crate D crate
Forced
Cooling
̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲ ̲
Bottom of D crate
3. C̲A̲M̲P̲S̲ ̲O̲P̲E̲R̲A̲T̲I̲N̲G̲ ̲C̲O̲N̲D̲I̲T̲I̲O̲N̲S̲.̲
a) Based upon 2c the max average temperature increase
and max peak temperature increase at 2000 m
altitude are calculated as:
Air pressure at sealevel (0m) is normally 760
mm Hg, and at 2000m 600 mm Hg. Thus the forced
cooling airflow at 2000m (airflow…0f…(2000)…0e…) is
reduced compared to the airflow at sealevel
(airflow…0f…(0)…0e…).
airflow…0f…(2000)…0e… = airflow…0f…(0)…0e… * 600/760
This causes a rise in both T…0f…av-inc…0e… and T…0f…i-inc…0e….
T…0f…av-inc(2000)…0e…= T…0f…av-inc(0)…0e…*760/600 = 15*760/600 =
19…0e…o…0f…C.
…0e…-----…0f…
T…0f…i-inc(2000)…0e…= T…0f…i-inc(0)…0e…*760/600 = 20*760/600 =
25.3…0e…o…0f…C. (i = 1, 2, 3, 4).
…0e…-------…0f…
b) Combining 2a and 3a it is seen that CAMPS will
function at T…0f…amb…0e… = 40…0e…o…0f…C.
c) Combining 2b and 3a it is seen that:
1) operation with T…0f…amb…0e… = 10…0e…o…0f…C. - 18…0e…o…0f…C. is provide
with no degraded reliability.
2) operation with T…0f…amb…0e… = 18…0e…o…0f…C. - 40…0e…o…0f…C. is only
provide with degraded reliability.
4. T̲H̲E̲R̲M̲A̲L̲ ̲D̲E̲S̲I̲G̲N̲.̲
CAMPS H/W strongly recommends that the overall
thermal design is improved to provide operation
with T…0f…amb…0e… = 10…0e…o…0f…C. - 28…0e…o…0f…C. and no degraded reliability.
