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Construction Of Spirometer Testing Standard (Breathing Maneuver Simulator).

Authors
Spaulding-DB
Source
NIOSH 1978 Apr:16 pages
Link
NIOSHTIC No.
00133499
Abstract
A spirometer testing device (breathing maneuver simulator) was developed. The principal elements included a motor driven piston operating within a cylinder of known volume and an electronic circuit for precision control of motor rotation. The instrument provided a tightly regulated source of air for calibrating spirometers and other pneumatic devices. Electronics were designed around a crystal oscillator that provided a stable time base and fixed program memory element for determining the instantaneous rates at which the motor revolved. Components produced commands that caused the piston to move and displace a quantity of air having a time versus volume characteristic satisfying two mathematical equations. One equation defined an air flow simulating the expiration of a healthy 5 liter lung. The other equation defined the air delivery of a diseased lung with a 3 liter capacity. The instrument provided automatic calibration for either test cycle. Decisions needed to produce varying air flow rates simulating an exhaling human lung and satisfying the above equations were synthesized by the digital logic circuits. The instrument was inherently repeatable to the accuracy limits of the crystal (0.01 percent) and the mechanical elements (0.014 percent). The author concludes that long term repeatability is not projected to vary since there are only two moving parts, and crystal drift is negligible.
Keywords
NIOSH-Contract; Physiological-measurements; Pulmonary-function-tests; Analytical-methods; Medical-research; Metabolic-study; Chemical-analysis; Respiratory-system-disorders; Biochemical-analysis; Clinical-chemistry; Contract-210-77-0052;
Publication Date
19780401
Funding Type
Contract;
Fiscal Year
1978
NTIS Accession No.
PB83-245209
NTIS Price
A03
Identifying No.
Contract-210-77-0052
Priority Area
Asthma and Chronic Obstructive Pulmonary Disease; Disease and Injury; Respiratory-system-disorders;
Source Name
NIOSH, U.S. Department of Health, Education, and Welfare, Rockville, Maryland, NTIS PB83-245-209
State
MD;
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