MIL-HDBK-1908B
dBC snv. The unit used to express sound level measured through the C-weighting network of a sound level meter. See "C-weighted sound level (dBC)."
dBP snv. The unit used to express peak pressure level as measured with a peak-reading sound level meter or combination of instruments with equivalent characteristics, without weighting networks, and with total rise time not exceeding 1/20 of the measured A-duration.
Dead-man control gen. A control which requires a continuous pressure or contact by the operator to maintain machine, equipment component, subsystem, or system operation. Such operation automatically returns to a noncritical state once operator pressure or contact is removed.
Decibel (dB) snv. A unit to express sound pressure level. The decibel is the unit of level when the base of the logarithm is the tenth root of ten, and the quantities concerned are proportional to power. The dB has meaning only when the referenced quantity is known. The internationally accepted reference pressure in acoustics is 20 micropascals (µPa) which corresponds to 0 dB. See "Sound pressure level."
Decibel (dB) reference level (0 dB) snv. The level that corresponds to an RMS
pressure of 20 micropascals (µPa).
Decontamination gen. Use of chemical solution or physical processes to absorb, destroy, neutralize, or remove nuclear, chemical, or biological agents from persons, objects, or areas.
Dedicated key uci. A key which produces one code and is never affected by the position of either the CTL or SHIFT keys.
De-emphasis snv. The inverse of pre-emphasis, employed to restore original vowel-consonant amplitude relationships in pre-emphasized speech; primarily useful in maintaining the "natural" sound quality. (See "Pre-emphasis.")
Default value uci. A predetermined, frequently-used value for a data field or control entry, intended to reduce required user entry actions.
Delimiter uci. A character marking the beginning or end of a unit of data.
Demonstrate acq. When used relative to test and evaluation, "demonstrate" implies a qualitative test that does not require comparison of test results to an applicable requirement(s). (See "Confirm.")
Depot level maintenance acq. Maintenance performed on material requiring major overhaul or a complete rebuild of parts, assemblies, subassemblies, and end items, including the manufacture of parts, modification, testing, and reclamation as required.
Determine acq. When used relative to test and evaluation, implies a quantitative test that does not require comparison of test results to an applicable requirement(s). (See "Evaluate.")
Developmental test and evaluation (DT&E) acq. Test and evaluation performed to (1) identify potential operational and technological limitations of the alternative concepts and design options being pursued, (2) support the identification of cost-performance trade-offs, (3) support the identification and description of design risks, (4) substantiate that contract technical performance and manufacturing process requirements have been achieved, and (5) support the decision to certify the system ready for operational test and evaluation.
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