Memory Backup Power; Operating Environment; Operating Temperature; Ventilation Requirements - Tektronix 11302A Service Reference Manual

Memory Backup Power
A battery (AllBT1190) within the instrument allows the retention of volatile mem-
ory upon loss of the AC power source.
This
battexy provides memory backup power
which stores the last instrument settings when the power is off. The self-test will
display a message to indicate when the battery needs to be replaced.
Another battery (A16BT520) allows the retention of mainframe settings via the
STOREfRECALL menu of the mainframe. The battery maintains the storage buff-
ers when the power is off. There is no diagnostic self-test coverage of A 16BT520's
charge level.
The batteries have a normal shelf life of approximately five years. Partial or total
loss of stored settings upon power-up
may
indicate that the battery(ies) needs to be
replaced.
Operating Environment
Operating
Temperature
Ventilation
Requireme~ts
1-4
The following environmental requirements are provided to ensure proper opera-
tion an d long instrument life.
This instrument
can
be operated where the ambient air temperature is between
0°
and
+
50° C
and
can
be stored in ambien t temp eratures from
-40°
to
+ 75° C.
After storage at temperatures outside the operating limits, allow the chassis to
reach th e safe operating temperature before applying power.
To prevent damage to the Counter Timer Oscilloscope from overheated compo-
nents, adequate internal airflow must be maintained at all times. Before turning on
the power, check the air-intake holes for obstructions. Remove any obstructions to
air flow and provide both the bench and the rack mount models with a minimum of
two inches of clearance at th e sides and rear. To maintain adequate cooling, a vari-
able speed fan controls the air flow as temperature varies.
If air flow is restricted, the instrument 's power supply may temporarily
shut down.
C1P.nP.ral Information -11302A Service Reference