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Reducing Error Mapping Custom Cable Test Fixtures... Continued from previous page
than one of these methods. The goal is al- ways the same: connect the custom cable or harness to the tester in a way that is reliable, repeatable and practical for pro- duction. But getting the hardware con- nected is only part of the job.
The Translation Problem Once the physical fixture is built,
the test system still needs to understand what it is looking at. A cable tester meas- ures continuity using raw test point numbers. Those numbers are useful to the instrument, but they mean little to a technician trying to isolate a fault on a real connector. Without a translation layer,
a reported short between two test points may require a manual lookup to determine which con- nector and pin locations are in- volved. That lookup takes time, introduces transcription risk and creates exactly the kind of hu- man error that automated test- ing is supposed to reduce. The pin map provides that
translation layer. It links each physical pin on a custom mating connector to its corresponding test point number. It also associ- ates each connection with a meaningful connector image and pin label. When the map is cor- rect, a fault report becomes im- mediately actionable. A techni- cian can see that a short has oc- curred between two specific pins on a specific connector instead of having to interpret abstract tester data. When the map contains er-
rors, the problem becomes more serious. The test system may still operate confidently, but it will re- port incorrect results. In produc- tion, a confident but wrong test result can be worse than no test result at all.
Fixture Mapping Errors Mapping errors tend to ap-
pear in predictable ways. One common mistake occurs when the cable under test is left connected while the technician probes the fixture. In that case, the techni- cian may inadvertently map the wiring of the cable rather than the fixture itself, corrupting the map from the start. Another error occurs when a
pin that will later carry wiring is not assigned to a test point. When that happens, the conduc- tor may appear on the screen as belonging to an unmapped head- er instead of the correct connec- tor. Reversed pin assignments are especially difficult because the map may appear complete even though two pins have been swapped. The fixture will then report wiring errors on cables that are actually correct.
Software as a Defense The most effective way to re-
duce these errors is to replace manual lookup tables with pur-
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pose-built mapping software. CAMI Research’s PinMap™ fixture editor, which operates within the CableEye software environment, is designed to simplify the process of creating and ver- ifying fixture maps.
Probe-driven pin-mapping software helps technicians associate
physical connector pins with tester points while reducing manual data entry errors.
The workflow is probe-driven. Once the fixture is built and connected to the
tester, the technician activates a scan- Continued on page 54
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