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Electronic in-circuit PCB testers & identifier PCB tester
Author(s)
Kotze, W.P.
Date Issued
1989
Type
Thesis
Publisher
Cape Technikon
Abstract
various types of electronic card test equipment are freely
available today for different types of electronic printed
circuit boards. A company certainly wants to pick the most
suitable tester to suit their needs, and more importantly a
tester that will fit into their bUdget. Today a company can
easily import in-circuit testers that will cost well in the
reglon of six figures. The cheaper the equipment go, the less
features one can expect from the equipment. Like all other
big decisions in life, this might also be a tough one for a
company.
Part one of this thesis will consider most of these questions,
and will also give more insight on what type of specifications
to look for. This section will also explain the different
types of faults that occur, the repair costs involved,
different types of card testers available and some of their
features. Advanced in-circuit testing techniques will also be
explained.
Part two of this thesis describes the design and development
of the Identif ier Card Tester. The" Program Control and
Impulse Sender Card", (referred to as "Identifier Card") is
one of the cards used in a system called "Electronic
Identifier".
The electronic identifier was developed to enable a subscriber
directory number, a line or equipment numbers, or in general,
the origin of information and classes-of-service to be
determined by way of an existing connection within a telephone
exchange. The system was designed for the purpose of
incorporating it into the existing public exchanges where no
identifier wires are available. It operates on the principle
of a switching circuit (line) tester. The identification
pulses are evaluated with the aid of 6 mm bistable magnetic
ring cores according to the current steering principle. The
program control and the output circuit uses a transistor, a
magnetic core/transistor or a magnetic core/thyristor circuit.
The electronic identifier is mostly used with "Routiners" in
Electra-mechanical exchanges. The biggest percentage of
failures on these systems are caused by the Identifier Card
and hence the request for the development of a "Identifier
Card Tester".
available today for different types of electronic printed
circuit boards. A company certainly wants to pick the most
suitable tester to suit their needs, and more importantly a
tester that will fit into their bUdget. Today a company can
easily import in-circuit testers that will cost well in the
reglon of six figures. The cheaper the equipment go, the less
features one can expect from the equipment. Like all other
big decisions in life, this might also be a tough one for a
company.
Part one of this thesis will consider most of these questions,
and will also give more insight on what type of specifications
to look for. This section will also explain the different
types of faults that occur, the repair costs involved,
different types of card testers available and some of their
features. Advanced in-circuit testing techniques will also be
explained.
Part two of this thesis describes the design and development
of the Identif ier Card Tester. The" Program Control and
Impulse Sender Card", (referred to as "Identifier Card") is
one of the cards used in a system called "Electronic
Identifier".
The electronic identifier was developed to enable a subscriber
directory number, a line or equipment numbers, or in general,
the origin of information and classes-of-service to be
determined by way of an existing connection within a telephone
exchange. The system was designed for the purpose of
incorporating it into the existing public exchanges where no
identifier wires are available. It operates on the principle
of a switching circuit (line) tester. The identification
pulses are evaluated with the aid of 6 mm bistable magnetic
ring cores according to the current steering principle. The
program control and the output circuit uses a transistor, a
magnetic core/transistor or a magnetic core/thyristor circuit.
The electronic identifier is mostly used with "Routiners" in
Electra-mechanical exchanges. The biggest percentage of
failures on these systems are caused by the Identifier Card
and hence the request for the development of a "Identifier
Card Tester".
Additional information
Thesis (Masters Diploma(Electrical Engineering)) -- Cape Technikon, Cape Town,1989
Subjects
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Electronic in circuit PCB testers and identifier PCB tester.pdf
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