ATE Glossary [Q - Z]
Quantising Error – The uncertainty that exists in an analogue to digital conversion resulting from the finite steps between adjacent digital representations. Increasing the resolution of the ADC reduces the error.
Repeatability – The ability of an test instrument or test system to be able to provide the same result when a test is repeated with the same UUT. Poor repeatability is a problem that requires attention in any test system, and may arise from stray pick up, inconsistent contact between the UUT and the fixture, etc.
SCPI – Standard Computer Programming Interface. It originated with the use of GPIB and it defines a standard set of commands to control programmable test and measurement devices in instrumentation systems.
Settling Time – The time required after a change for a circuit or test instrument to reach its steady state.
STDF – Standard Test Data Format. A data format in which test system can output data. The idea was developed to create common standards and allow data to be interchanged more easily, thereby simplifying processing. Unfortunately many interpretations of the standard exist and it is necessary to ensure compatibility before use.
STIL – Standard Test Interface Language. An emerging standard encompassed by IEEE working group 1450.
Stimulus – An input signal, which may be an input voltage, digital bit pattern, etc that is used to excite a UUT, and stimulate a response which is measured or detected at the output.
Test Specification – The document that defines the specific tests with conditions that are applied to the UUT.
Throughput – The number of items that can be processed in a given time.
UUT – Unit Under Test. The target item that is being tested.
Yield – The proportion of good items that are produced by a manufacturing system.