MIL-HDBK-1164
generators in accordance with the manufacturer's instruction (operation at full load for
at least 1 hour is commonly recommended). Normal power sources must be
disconnected to operate standby power at full load. Engine generators should comply
with all applicable regulations regarding exhaust emissions.
11.4.6
Instrumentation and Controls. The following paragraphs address
maintenance and calibration issues. Additional information on instrumentation and
controls, including general troubleshooting guidelines, can be found in Section 9 and in
par. 2.1.4.
11.4.6.1
Regular Maintenance. If kept in the proper environment, modern
electronic equipment requires only periodic cleanings. Every 3 months, instruments
should be opened or withdrawn from their cases, inspected, and cleaned with a soft
brush. Instruments with moving parts should be lightly lubricated in accordance with
the manufacturers' instructions. Do not over-lubricate. Check for interferences
between moving parts. Fill ink wells on recorders as needed. Look for source of
unusual heat, sound, or odors.
11.4.6.2
Calibration. Check calibration annually on instruments, gages, and
pressure switches. If possible, calibrate equipment in place using the piping, wiring,
and fluids of the processes and calibrate a whole subsystem at once. Since this
method does not require removing the instrument, it avoids errors such as bad
connections and leaks on reinstallation. The disadvantages are that in-place
calibration may disrupt the process, and it may be difficult to get sufficient accuracy and
range. Calibrate pressure gages and pressure switches by connecting them to a
pressure header with a bleed valve and a pressure valve connected to an air tank. Use
a gage of known accuracy and recent calibration for a reference. Check set points of
pressure switches on increasing or decreasing pressure. Gages and pressure
switches should be checked annually.
11.4.7
Tools and Equipment. In order to maintain, repair, and troubleshoot
electrical equipment and circuits, the proper tools are required. In addition to a normal
complement of small hand tools (see par. 11.12), a voltage tester with sufficient range
device for checking the insulation resistance), and an ohmmeter or circuit tester are
required.
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