Exceptional critical requirements

i. Exceptional critical requirements.

Calibration that requires more

stringent controls than those specified above will be documented and

submitted to AMCC for approval.

When approved, the returned operational

procedure will be recognized as a requirement and will be permanently filed

in the laboratory.

j. Operation of environmental conditioning equipment.

(1) Temperature, humidity, and dust.

The equipment

providing

conditioned air to the laboratory will be operated continually.

(2) Emergency power.

In general, there is no requirement for

emergency power other than emergency lights for personnel safety. However,

local commanders will assure continuous and reliable power consistent with

workload requirements.

k. Instrument protection.

Instruments susceptible to damage as a

result of interruptions (momentary or longer) will be protected by manually

reset circuit devices that open on loss of electrical power.

l. Loss of Laboratory Controlled Temperature Environment. Operational

emphasis will be placed on maintaining the controlled environment, but when

control is lost, emphasis will be placed on expeditiously reinstating the

environment to a controlled condition.

When the laboratory environment exceeds the limits of paragraph 4a above,

limited calibration may be continued as outlined in the following

subparagraphs. As a general rule, determine the instruments that are least

sensitive to environmental controls; determine the instruments that can be

accurately calibrated without a controlled environment; determine the

standards that can be accurately used to accomplish calibration without a

controlled environment; and proceed with calibrations that will not degrade

the operational characteristics of the instrument to be calibrated.

Instructions in the following subparagraphs apply, and the procedures for

all environmental conditions must be reviewed before continuing calibration.

(1) Temperature.

Technical publications for measurement standards

and TMDE will normally contain information relative to instrument operating

characteristics at various temperatures.

Through the use of these

publications, a determination can be made to use or not to use a measurement

standard to calibrate.

They can also be used to determine whether an

instrument can or cannot be calibrated when the laboratory temperature is

not within the specified limits.

(a) Measurement

standards

and

TMDE

that

have

individual

temperature controls, e.g., oil bath resistors, may be used to calibrate (or

be calibrated) when the temperature of the instrument is within

specifications.

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