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PRODUCTS
EL
Introduction
 Short
Detection
Model
Board Comparison
EL
Software
System Components
Specifications
download brochure
 sales@optotherm.com
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 EL Shorts Detection
Short circuits
on a PCBA can be very difficult to troubleshoot. While ICT may
indicate that a short circuit exists, often it cannot locate the precise
location of the defect. Technicians and engineers can spend many hours
locating a single shorts, particularly interlayer and low resistance shorts.
The InfraSight EL
320 camera's
high sensitivity, combined with sophisticated noise reduction and image
enhancement software algorithms, provide the ability to detect and locate
shorts that dissipate less than 1 milliwatt of power and that exhibit
temperature rises of only 0.03°C.
During a short
detection test, boards are typically powered for 5 to 10 seconds. The
I/O module provides a relay output to control power to the board.
Example
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Low resistance
and power-to-ground shorts are often the only areas that heat up on a
board during a short detection test. The low resistance short
picture below was located by applying 500 milliamps of current for 5
seconds. |
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The precise
location of the short was determined by overlaying a transparent visual
picture of the board on the thermal image. |
Short Detection Settings
Test Averaging
enables you to detect shorts with a resistance under 1 ohm. Because
low resistance shorts do not dissipate much power and heat, a series of
tests are averaged together to increase test sensitivity.
The Auto Stop
feature opens the I/O module relay, cutting off power to the board, as soon
as the temperature on the short increases above a user-defined threshold.
This safety feature can prevent damaging the board, while still locating the
short.
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