System Testing

1
System Testing

• "You make it, Ill break it"

2
Purpose

• Does the product as a whole perform up to
  specifications? (validation?)
• Does it perform under normal, upper, and lower
  limits wrt the environment?
• Does it meet or exceed all claims?

3
Stressors
Temperature Humidity
Altitude Shock
Vibration EMI
Cell phone, pagers Brownouts
ESD Spillage
Shipping Power Surges
4
Customer Misuse

• Coffee spillage
• Drop in toilet
• Use as a seat
• Cross-connecting
• Reverse polarity
• Dirty hands
• Unplugging via jerk on cable

5
Testing requires that you define failure!

• Intended application?
• Anticipated environment?
• Lifetime?
• Value vs. time
• Sunken ships make good coral reefs in time

6
Types of testing

• Event testing cycling, time to failure
• Environmental operating storage
• Altitude
• Threshold (door, elevator, bricks )
• Vibration
• ISTA shipping test
• EMI (standards!, see next slide )

7
EN 1000 series standards

• Radiated electric field immunity
• Fast transients
• Surge, line, magnetic
• Dips, variations, V, F variation
• On/off, ESU
• Walkie-talkie, cell phone
• ESU, etc.

8
Types of testing, continued

• Life test/reliability
• Customer misuse
• Fluid spillage
• Weight test
• Keyed connections
• Time related
• Failure related (MTBF)