Circuit tester

Leitungsprufer = circuit tester 58 Leit-Sprengschnur = trunkline 80 Leuchtsatze = illuminant compositions 185... 

Instrument for electrical testing of misconnected circuits. The current intensity used in the testing must be well below the minimum detonation intensity of the electric primer the circuit tester is accordingly equipped with resistances at both poles. Only officially approved testers should be employed. The testers are of two kinds conduction testers which show, by means of a visual indicator, whether or not current is flowing in the circuit, and ohmmeters which measure the resistance of the priming circuit. 

Check circuit board. The electronic manufacturer should have in-house expertise to program an automatic in-circuit tester for the board that ensures all components are in the correct place and that measures the correct value. 

Despite intensive efforts only Zipperling has recently succeeded [66] in putting commercial applications for conductive polymers into practice (with one exception a small rechargeable button cell for a solar-powered circuit tester [25], although its performance data are very modest by comparison with existing competing accumulators [26], so that it was withdrawn soon after its market introduction). 

To show students that the metal is shiny, it can be placed into a dry Petri dish, with the lid taped on, and it can then be passed around the class. The metals can also be shown to be conductors of electricity using a circuit tester. This can help students to accept that these strange substances are, indeed, metals, as they are not like any metals that they have met before. 

What type of test equipment will the consultant use Each professional will usually bring several items to the survey. You should expect the safety professional to bring a tape measure a ground loop circuit tester to test electrical circuits a multimeter (for 220 and/or 440 volts only) a tic tracer (or similar equipment) to check wires or electrical equipment to see if they are energized and a ground fault circuit interrupter tester [2],... 

The principal technology is the in-circuit tester. This tester utilizes a high degree of nodal access—that is, connection to printed circuit traces— to perform its work. Nodal access is provided by a unique fixture called the bed of nails. (See Fig. 55.4.) This fixture is made up of a platen that supports the board under test. The platen is drilled with holes below each target point for nodal access. In the holes are spring-loaded nails that contact the target points on... 

Another major differentiator is the ease— indeed, automation—of test programming that is possible with digital in-circuit testing. Tests for ICs can be prepared as if the ICs were standing alone, stored in a hbrary, and recalled from the library when needed. Modem digital in-circuit testers may have hbrary tests for tens of thousands of devices. For custom, one-of-a-kind ICs for which a hbrary test may not exist (e.g., ASICs), it is still substantially easier to create a test for just the one device than it is for a collection of ICs. 

The workhorse of the electronics industry is the general-purpose in-circuit tester that merges support for analog and digital in-circuit tests. An example of a widely used system is shown in Fig. 55.10. It contains power supplies for powering boards and often contains sophisticated... 

FIGURE 55.11 Typical test and repair flow for an in-circuit tester. 

In situations where a manufacturing line has a variety of technologies in production, a need may exist for both functional and in-circuit testing. Thus, hybrid functional/in-circuit testers (commonly called combinational testers) exist. These machines give test engineers a full... 

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