MIL-DTL-81219C
4.6.2.1.2 Complete indicator assembly (holder, indicating cell and regulator). The
indicators shall have a current flow of 70 ± 2 microamperes at room ambient conditions when
connected a voltage source supplying the voltage specified by the applicable MS sheet. A
microammeter placed in series between the indicating cell anode and the regulator shall be used
to measure the current. After any or all tests specified in 4.6.4 through 4.6.9 the current flow
must be 70 ± 3 microamperes.
4.6.2.1.3 Test readings. Unless otherwise specified herein, before a test reading is taken
on MS90373 indicators, the indicator may be tapped lightly or vibrated at 30, 60 or 120 Hz with
a maximum amplitude of 0.002 inch
4.6.2.2 (MS90386) Mercury types. The indicators shall be check in accordance with the
operational check test as specified on the MS sheet
4.6.3 Dielectric strength. The indicator shall be tested in accordance with MIL-STD-
202, Method 301. The indicator shall be tested at 1500 Vac, 60 Hz for one minute (see 3.3.2).
4.6.4 Thermal shock. The indicators shall be tested as specified below. At the
completion of the test, the indicator shall meet the operational requirements of 4.6.2. (see 3.3.3)
4.6.4.1 MS90386 (mercury type). The indicator shall be tested in accordance with MIL-
STD-202, Method 107, Condition A. The indicator shall be operated during the test at its rated
voltage and 60 HZ if is an AC indicator.
4.6.4.2 MS90373 (copper type). The indicator shall be tested in accordance with MIL-
STD-202, Method 107, Condition A except for the number of cycles specified in the MS sheet.
The indicator shall be operated during the test at its rated voltage and 60 HZ if is an AC
indicator.
4.6.5 Hermetic seal. (see 3.3.9).
4.6.5.1 MS90373 (copper type). The liquid filled indicating cell of the indicator shall be
tested for hermetic seal as follows:
The cell shall be placed on white absorbent paper.
The paper with cell(s) shall be placed in an oven at 85°C ± 3°C (185°F ± 5°F).
There shall be no evidence of staining of the paper (blue coloration) or the presence of
blue salts around the end caps upon completion of this test.
4.6.5.2 MS90386 (mercury type). After 1/2 hour exposure at 85°C ± 3°C (185°F ± 5°F)
there shall be no microscopic evidence of mercury leakage expulsion within the encapsulation.
4.6.6 Altitude. The indicator shall be tested in accordance with MIL-STD-202, Method
105 except the absolute pressure shall be 0.82 inches of mercury. The indicator shall be operated
for 10 minutes under the reduced pressure at the following voltage:
128 Vac, 60 Hz for 115 Vac indicators
29 Vdc for 28 Vdc indicators
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