MIL-DTL-6508C
4.4 Test conditions.
4.4.1 Atmospheric conditions. Unless otherwise specified, all tests required by this
specification shall be in accordance with the requirements of ASTM E171.
4.4.2 Vibration stand. When specified, a vibration stand shall be used that shall vibrate
at any desired frequency between 5 and 50 Hertz (Hz) and shall subject the thermometer to such
vibration that a point on the vibration stand shall describe, in a plane inclined 45 degrees to the
horizontal plane, a circle of the diameter specified in 4.5.8.(a).
4.5 Test methods.
4.5.1 Inspection. Each thermometer shall be examined externally to determine
conformance with the applicable drawings and with all the requirements of this specification not
covered by tests.
4.5.2 Scale error. Each thermometer shall be tested for scale errors at the points of the
scale indicated in table II, starting at the lowest temperature. Tests shall be accomplished by
placing the thermometer dial in a horizontal position and immersing the thermometer stem to the
attaching thread in a temperature-controlled bath. The thermometer stem shall be gradually
subjected to the lowest temperature so that the bimetallic junction will not be subject to
unnecessarily severe conditions. No readings shall be taken until the thermometer has been
immersed in the bath at a temperature of -70 °C (-94 °F) for 15 minutes. The errors at the test
points shall not exceed the tolerances specified in table II. If so specified by the inspector, the
thermometer shall be tested for scale errors at any additional points on the scale.
TABLE II. Thermometer scale error.
True indication
Tolerance
°C
±°C
-70
2.0
-60
1.0
-50
1.0
-40
1.0
-30
1.0
-20
1.0
-10
1.0
0
1.0
10
1.0
20
1.0
30
1.0
40
1.0
50
1.0
10
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business