MIL-DTL-25026C
4.3.3.1 Cold junction compensator lag. The indicator shall be connected to a chromel-
alumel thermocouple (8 ohms total external circuit resistance), immersed in an ice bath of 0°C, and a
millivoltage of constant value applied in series with the indicator and thermocouple to provide
reading of 700°C. The indicator shall then be subjected to the conditions of the "Cold junction
temperature lag" test specified in MIL-I-7071 for increasing and decreasing temperatures. The
indication of the indicator throughout the test shall at no time vary by more than 30°C from the
indication obtained at room temperature.
4.3.3.2 Extreme low temperature exposure. The scale errors at low temperature, as specified
in the "Extreme low temperature exposure" test of MIL-I-7071, shall not exceed the tolerances
specified in Table I. The scale errors at room temperature after low temperature exposure shall not
exceed the tolerances specified in Table I.
4.3.3.3 High temperature exposure. The scale errors at room temperature after high
temperature exposure, as specified in the "High temperature exposure" test of MIL-I-7071, shall not
exceed the tolerances specified in Table I.
4.3.3.4 Thermal shock. No damage to the indicator shall result from the thermal shock test
when subjected to the requirements the "Thermal shock" test of MIL-I-7071.
4.3.3.5 Salt fog. The scale errors at room temperature after salt fog exposure, as
specified in MIL-STD-810, Method 509, shall not exceed the tolerances specified in Table I.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as
specified in the contract or order (see 6.2). When packaging of materiel is to be performed by
DoD or in-house contractor personnel, these personnel need to contact the responsible packaging
activity to ascertain packaging requirements. Packaging requirements are maintained by the
inventory control point's packaging activities within the military service or defense agency or
within the military service's system command. Packaging data retrieval is available from the
managing military department's or defense agency's automated packaging files, CD-ROM
products, or by contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful,
but is not mandatory.)
6.1 Intended use. The thermocouple temperature indicator covered by this specification
is intended to indicate the exhaust temperature of jet engines.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a. Title, number, and date of this specification.
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