TEXT
1.
INTRODUCTION
a. In previous lessons you have seen that there are two secondary
levels in calibration: secondary reference and secondary transfer. Both of
these levels are operated by the Army calibration company.
b. In this lesson we are concerned with the overall operations of an
Army area calibration laboratory at the secondary reference level. Although
the prime concern of the laboratory is calibration of equipment, there are
many other activities besides calibration of equipment taking place in the
laboratory.
2.
STRUCTURE
a. Secondary reference standards.
Secondary reference standards are
located in work areas separated from production and maintenance functions so
that they will be used as calibration standards only, and not as maintenance
equipment.
Since temperature, humidity, dust, vibration, etc, affect the
reliability of the standards, the environmental conditions of a laboratory
are controlled.
b. Requirements.
General requirements for laboratories are listed
below; however, detailed specifications for reference facilities are
provided by the Army Metrology and Calibration Center.
(1) Facility size.
A single facility should have at lest 8,000
square feet of working area, of which 2,000 square feet must be
environmentally controlled.
(2) Environmental control requirements.
The
requirements
for
environmental control are listed in TB 750-117.
(3) Power requirements:
(a) 115 v 60 Hz single phase
(b) 208 v 60 Hz 3 phase
The total amount of power (a) and (b) are dependent upon the
types of TMDE supported and the environmental control system used.
Some
avionics equipment and some RADAR systems are based on 400 Hz instead of 60
Hz; therefore, 400 Hz may also be a requirement. The TOE authorizes 3 each
of 60 kilowatt 60 Hz generators per module lab.
c. Facility layout.
(1) It should be emphasized here that the facility's organization and
layout is flexible. Organization for operations and layout is dependent on
facilities available and operational requirements.
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