Environmental Stress Screening (ESS) &
Burn-In Monitoring System for
AT&T Power Systems

Front view of Tester showing 20 Burn-In Loads, Power Switching Units, and VXI Switching

Application

Telecom AC/DC and DC/DC Power Supplies
Functional Test and Burn-In of 20 Power Supplies
Thermal chamber for accelerated temperature stress screening
Instrumental in AT&T Power Systems winning Deming Award 1994

Features

Dual 25 Module VP front panel interface inside thermal chamber
C size VXI mainframe for switching
20 plug in resistor load slots can accept different burn-in loads
Switches AC or DC Power to the 20 UUTs
Facility supplied AC, DC supplied by 20 AT&T DC Power Supplies
FineSoft on LabWindows CVI platform

How it works:

The system functionally tests one supply, while the other 19 burn-in at full load.

After the first supply has finished its functional test, it is connected to its burn-in load.

The tester then switches to the next supply for functional testing.

The functional test cycles through all of the 20 supplies.

The Thermal Chamber moves the temperature, and the test/burn-in cycle repeats.

The total test time is 48 hours.

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More Details...

20 AT&T DC Power Supplies and fused AC Power Switching Units

Close-Up of dual 25 Module Virginia Panel Interface
located inside the thermal chamber

FineTest Software to both Functionally Test and Monitor Burn-In of the 20 UUTs