Diagnosis of Malfunctions in Complex Electronic Assemblies. Final Report. Page: 54 of 66
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The following categories were defined as special needs in portable analysis
" When transient or switching discrepancies occur, a multichannel
viscicorder is needed to record current and voltage parameters
during the turn-on transient.
" A dual-beam scope equipped with current and voltage probes and dual-
channel preamplifiers is very useful when making time or phase com-
parisons of pulse conditions.
" Digital multitesters have the advantage of quick readout, accurate inter-
pretation of the readout, and relatively high input impedance.
" A small portable counter that would count frequency, display time delay
between pulses, and give the ratio between two frequencies or repetition
rates was often needed.
" A logic generator that would furnish a compatible logic output was often
needed to allow signal injection techniques to be employed.
" Portable power supplies were often necessary to eliminate dc supply
lines as possible contributors to cross-talk and spurious problems.
" High-sensitivity clip-on current probes, along with associate amplifiers
and current milliammeters, were sometimes needed in transistor cir-
In this phase of the study, diagnostic equipment for evaluating components
was considered. The equipment used was to aid in diagnosis and to verify
that a component was bad at the time of rejection, confirm the assembly
rejections, and furnish fast feedback on the line.
A frequent need existed for analytical equipment that will evaluate the
" Semiconductors such as tunnel diodes, rectifier diodes, zener diodes,
transistors, and other discrete devices;
" Components such as capacitors, inductors, and resistors; and
" Parameters such as voltage, current, frequency, and ratio between
repetition rates or frequencies.
Integrated and hybrid circuits were sometimes questioned, but they were
welded to the mother boards and could not easily be evaluated without re-
moval from the board.
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Losure, J. A. Diagnosis of Malfunctions in Complex Electronic Assemblies. Final Report., report, January 1, 1971; Kansas City, Missouri. (https://digital.library.unt.edu/ark:/67531/metadc1031893/m1/54/: accessed March 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.