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Adaptation of a Slow-Speed Data Acquisition System to Record Multiple Time-Related Signals.

Authors
Newman-R; Corp-EL
Source
BoM, 1970 :9 pages
Link
NIOSHTIC No.
10009017
Abstract
An inexpensive slow-speed data acquisition system has been adapted to digitally record multiple parameters simultaneously at intervals of 15 seconds. The system was built for use with standard soils testing equipment to automatically record load and displacement parameters at predetermined instants in time. Simultaneous readout is achieved by the use of special signal conditioner and sample-and- hold circuits which read the multiple signals simultaneously and hold them until the slow acting system can print out. Three channels of a 10-channel system have been converted and found to operate successfully during a series of direct shear tests. A unique feature of the system, which significantly reduced its cost, is the power supply units. Dummy circuits are used to maintain a constant power demand during sampling, thus eliminating the need for a costly power supply with rapid response characteristics. The entire system, having an overall accuracy of 0.25 percent, was put in operation for a cost under $2,500.
Publication Date
19700101
Document Type
IH; Report of Investigation;
Fiscal Year
1970
NTIS Accession No.
PB-190980
NTIS Price
A99
Identifying No.
RI 7374
NIOSH Division
MMTC;
Source Name
Bureau of Mines
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