Microcontroller-based instrument for testing in-circuit devices

Date

3-2004

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Nelio C. Altoveros

Abstract

test instrument for use in testing of in-circuit active components on an operational amplifier board was designed, implemented and tested. The design is composed of four modules: the power supply, peak detector/frequency-to-voltage converter, function generator/multiplexers and the microcontroller module. Control signals of the device (i.e., select hits of the multiplexers, initiation of the test and monitoring of the input/output signals from the test points in the test board) are managed by the ATMegal63 microcontroller. The instrument was implemented and customized to work on a specific test board fabricated by the proponent. The test board uses a dual general purpose operational amplifier IC (LM1458).The first op amp of the package was configured as a non-inverting amplifier with a voltage gain of 2; while the second is a voltage follower. The device was designed to work for the mentioned test board. Its operating frequency is 5 kHz It sends and monitors output waveforms to and from the four test points found in the test board. If the monitored outputs from the four test points are equal to the functional values obtained using standard instruments, the test point passes the test; otherwise it fails. If all test points have a PASS judgment, the test board passes the ICT; otherwise it fails.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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