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primary standard

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primary standard

[′prī‚mer·ē ′stan·dərd]
(science and technology)
A unit directly defined and established by some authority, against which all secondary standards are calibrated; for example, in analytical chemistry, reference substances or solutions of known chemical purity and concentration are used to standardize laboratory solutions prior to volumetric analysis or titration.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive
RAWALPINDI -- Punjab government has decided to conduct rechecking of answer sheets of 20 top students in Middle and Primary standard examination through out the province including Rawalpindi.
The E2 is Embraer's first civilian aircraft project that implements "Fly-By-Wire" software fully developed internally and tested with the LDRA tool suite for certification for DO-178C — the primary standard for commercial avionics software development.
Nonetheless, later courts recited the primary standard in opinions on wholly or partially tax-motivated transactions without explaining why it should apply.
This applies to rectilinear accelerometers with zero-frequency response, mainly of the strain gauge or piezoresistive type, and to primary standard and working transducers.
Of the 25 lakh students up to middle school in Haryana, nearly 14 lakh are primary standard students.
The values determined were consistent with calibration data obtained over two decades at the manufacturer's laboratory for eight primary standard microphones that were permanently stored there at room temperature; within the experimental errors no significant change was observed in the microphone sensitivities over the measurement period [7].
promulgates a primary standard for public health, and then sets a
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