Vibration Step Stress

Specification Limits

Minimum Specified Operating Level (No loss of operation):

Operational Limits

Maximum Operating Level (No loss of operation):

Result Table

Test Summary

Infrared Baseline Photo

Unit is allowed to stabilize at approximately 25°C ambient temperature, convection cooled, with

600 W output power before infrared photo is shot. See attached topside and bottomside photo.

Thermal Survey

Cold Start

Unit is placed in the chamber, power off, and allowed to stabilize at the ambient temperature.

With an oscilloscope probe attached to both the input and the output, power is applied and the

time difference between application of power and output voltage is recorded. See attached chart

for all configurations.

Vibration Qualification

One hour of random vibration in each of three (3) orthogonal axes. Profile: 0.038 g

20-350 hz; -60 B/oct, 350-2000 hz; 4.86 grms.

HALT Temperature Cycling Step Stress and Vibration

Unit is exposed to progressively more severe operating temperatures and random vibration

environments. Failures that occur are diagnosed for root cause, corrective action is performed, and

then the test is continued. The levels are increased unti the test extremes or the fundamental limit

of the unit is reached (whether by technological or economic limitations.)

C10, C40, C48 broke.

L2 and part of T3 lead

broken. Trace bared

beneath T3.

-

Root Cause

No RTV on C13.

No RTV on C40 or

C48; a little RTV on

C10.

RTV only between

board and T2 on one

end.

Added RTV between board and

T2 on both ends of T2.

-

-

axis

None.

None. Unit reached fundamental

limit of technology.

axis

#4 lead of T2 broke.

axis

Added generous amounts of RTV

between C40, C48, C10 and their

surrounding components.

-

After attaching thermocouples, unit is placed in the chamber, powered on, and allowed to reach a

stable temperature. Component temperature is monitored throughout the test. See attached chart for

all configurations.

axis

Added RTV between C13 and

surrounding components.

Incorp.

Corrective Action

Problem

C13 broke.