1260-134 User Manual
Racal Instruments
Ó
2003
Specification
1-3
<
30
°
C
Altitude
Operating
10,000
feet
Non-operating 15,000
feet
Power Requirements
+5 VDC
150mA + 30mA per energized relay
(2A Max.)
Weight
1.0 lb. (0.45 kg.)
MTBF
749095 hours (MIL-HDBK-217E)
Dimensions 4.5”H X 0.75”W X 9.5”D
About MTBF
The 1260-134 MTBF is 749095 hours, calculated in accordance
with MIL-HDBK-217E, with the exception of the electromechanical
relays. Relays are excluded from this calculation because relay life
is strongly dependent upon operating conditions. Factors affecting
relay life expectancy are:
1. Switched voltage
2. Switched current
3. Switched power
4. Maximum switching capacity
5. Maximum rated carrying current
6. Load type (resistive, inductive, capacitive)
7. Switching repetition rate
8. Ambient temperature
The most important factor is the maximum switching capacity,
which is an interrelationship of maximum switching power,
maximum switching voltage and maximum switching current.
When a relay operates at a lower percentage of its maximum
switching capacity, its life expectancy is longer. The maximum
switching capacity specification is based on a resistive load, and
must be further de-rated for inductive and capacitive loads.
For more details about the above life expectancy factors, refer to
the data sheet for the switch plug-in module.