Safe High Voltage
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(SHV) -
A type of connector used with BNC cables for safe connection to high voltage sources. The connector uses a bayonet mount similar to those of BNC connectors, but it is easily distinguished due to its very thick and protruding isulator. The insulation makes SHV connectors safer for handling high voltages by preventing accidental contact with the live conductor in an unmated connector or plug. The connector is also designed such that when it is being disconnected from a plug the high voltage contact is broken before the ground contact, thereby preventing accidental shocks.
Source: The Paramatric Measurement Handbook
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Safety
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Safety Case
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A final study that provides proof that the system will remain acceptably safe for a particular failure scenario.
Source: Testability.com
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Safety Shutdown
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De-energization of the main fuel flow means as the result of the action of a limiter, a cut-out or the detection of an internal fault of the system.
IEC 60730-2-5, ed. 3.0 (2000-04) Reference number: 2.3.122
Source: International Electrotechnical Commission
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Safety System
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System important to safety provided to ensure that in any condition, the safe shutdown of the reactor and the heat removal from the core and/or to limit the consequences of anticipated operational occurrences and design basis accident conditions.
Source: International Electrotechnical Commission
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Sag
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Deflection due to gravity acting on a cantilevered or otherwise supported object. Mechanical brackets that hold alignment tools always sag a certain amount. This sag must be corrected if the machine moves are to calculated correctly.
Source: Vibration Institute
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Sag Formula
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“Sag” is an abbreviation for “sagitta,” the Latin word for “arrow,” and refers to the height of a curve from the chord to the highest point.
Source: JML Optical
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Sample and Hold
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(SSH) -
PC Based measurement systems often use analog multiplexing for increasing channel count. Analog multiplexer causes short delay when switching from channel to channel. If the measurement system is used for a multi channel time related application like phase analyze or vibration measurements then sample and hold circuitry is needed. SSH is not needed if measurement devices has separate ADC for every individual channel.
Source: CMT Engineering Oy
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(S/H) -
circuit that acquires an analog voltage and stores it temporarily in a capacitor. This circuit is also referred to as a sample-and-hold amplifier (SHA).
Source: ATE World
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Sample Rate
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The rate at which a signal or value is sampled. It is frequently expressed as samples/sec (S/s), kilosamples/sec (kS/s), or megasamples/sec (MS/s).
Source: Measurement Computing
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Sampling
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The process of periodically measuring an analog waveform's amplitude. Sampling rate is the rate at which the samples are taken.
Source: Coreco
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Sampling rate
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The number of readings an A/D converter takes per second or per minute.
Source: Vibration and Shock
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Sandia Controllability and Observability Analysis Program
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(SCOAP) -
A method used to determine design testability; often used for scan or test point selection.
Source: Mentor Graphics
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Sanity Testing
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A sanity test or sanity check is a basic test to quickly evaluate the validity of a claim or calculation, specifically a very brief run-through of the functionality of a computer program, system, calculation, or other analysis, to assure that the system or methodology works as expected, often prior to a more exhaustive round of testing.
Sanity tests are sometimes mistakenly equated to smoke tests. Where a distinction is made between sanity testing and smoke testing, it's usually in one of two directions. Either sanity testing is a focused but limited form of regression testing – narrow and deep, but cursory; or it's broad and shallow, like a smoke test, but concerned more with the possibility of "insane behavior" such as slowing the entire system to a crawl, or destroying the database, but is not as thorough as a true smoke test.
Source: Wikipedia
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Sarbanes-Oxley Act
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The Sarbanes-Oxley Act of 2002 (Pub. L. No. 107-204, 116 Stat. 745, also known as the Public Company Accounting Reform and Investor Protection Act of 2002 and commonly called SOX or Sarbox; July 30, 2002) is a United States federal law passed in response to a number of major corporate and accounting scandals including those affecting Enron, Tyco International, Peregrine Systems and WorldCom (recently MCI and currently now part of Verizon Businesses). These scandals resulted in a decline of public trust in accounting and reporting practices.
The Act contains 11 titles, or sections, ranging from additional Corporate Board responsibilities to criminal penalties, and requires the Securities and Exchange Commission (SEC) to implement rulings on requirements to comply with the new law.
It has only indirect relationship to test, but since test is a cost-cutting procedure and there are requirements for auditor attestation of control disclosures, there may be some test-related issues.
Source: Wikipedia
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Saturation
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Condition in which a further increase in one variable produces no further increase in the resultant effect. In a bipolar junction transistor, the condition when the emitter to collector voltage is less than the emitter to base voltage. This condition puts forward bias on the base to collector junction.
Source: Twisted Pair
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Sawtooth Wave
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Repeating waveform that rises from zero to maximum value linearly drops back to zero and repeats. A ramp waveform
Source: Twisted Pair
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S-Band
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The frequency spectrum near 2 GHz used for land based microwave and some mobile satellite communications.
Source: Wireless Week
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Scalability or Scalable
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Describes computer files (audio, video etc.) that can be played at varying rates and levels of quality in accordance with the resources of the PC being used.
Source: Coreco
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How well a solution to some problem will work when the size of the problem increases. It is usually measure in terms of O(n^x), meaning "Order of n to the power x." If x=1 than the it scales linearly.
Source: Dictionary.com
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In telecommunications and software engineering, scalability is a desirable property of a system, a network or a process, which indicates its ability to either handle growing amounts of work in a graceful manner, or to be readily enlarged. For example, it can refer to the capability of a system to increase total throughput under an increased load when resources (typically hardware) are added.
Source: Wikipedia
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Scalability Testing
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Examines the performance of your Web sites, hardware and software products, and internal applications at all the stages from minimum to maximum load.
Source: VeriTest
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Scalar Notation
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