(1) Fewer than a million particles (larger than 0.5 micron) per cubic
foot.
(2) Fewer than two
hundred
thousand
particles
(larger
than
1.0
micron) per cubic foot.
d. Vibration.
Vibration at an instrument location under ambient
conditions must not compromise the validity of calibrations. Prior to site
selection, construction, or modification of an area calibration laboratory,
a site survey of vibration present and any special construction necessary
for control identified. It is recommended a similar analysis be made for an
internal calibration facility by the post, camp, or station of which the
laboratory is an element. Advice may be obtained from the US Army Metrology
and Calibration Center.
e. Illumination.
As a design criteria, a minimum illumination of 50
foot candles must be provided at bench level where measurement standards are
used for calibration.
In special cases, less or more illumination may be
required to read the standards or TMDE, or to calibrate. In these cases,
the need determines the requirement.
Additional illumination may be
provided through the use of incandescent desk lamps, workbench lamps, high-
intensity lamps, etc. that can be moved from one location to another and
turned off when not in use.
Equipment storage areas are exempt from this
requirement.
In some locations, electromagnetic
interference may cause disturbances and uncertainties in the operation of
measurement standards and TMDE. In these locations, the interference must
be eliminated.
The extent of interference must be surveyed and evaluated
locally. The need and extent of area shielding must be determined, and when
found necessary, shielding should be installed.
USAMCC will provide
assistance when requested.
g. Limitation.
(a)
through
(f)
above
establish
laboratory
environmental criteria.
These paragraphs do not take precedence over any
approved procedure for calibration, technical manual, or manufacturer's
manual when used in lieu of a technical manual for a specified standard.
There are no standardized requirements for electrical power, water
pressure, sewer flow rate, air pressure, and vacuum applicable to all
calibration laboratories.
These requirements must be based on the
calibration laboratory's needs, regulations, and installation operating
procedures.
h. Radiation - physics (nucleonics).
Except at the primary level,
standards do not require the environmental controls cited in (a) through (f)
above.
Facilities maintained at normal personnel comfort levels, with
on
good
housekeeping, will
normally
provide
an
adequate
environment.
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