MS90386D
3.2 Thermal shock. Indicators shall be tested in accordance with MIL-STD-202, Method 107 for the following number of cycles:
a. -1 through -12 - 5 cycles b. -101 through -112 - 10 cycles
3.3 Operational check. Each indicator shall have the following operational checks performed.
3.3.1 Indicating cell. At 25°C and the indicator energized at its rated voltage, the voltage between the test terminal (center terminal) and the input/test terminal (terminal nearest "+" sign) shall be measured. The measured voltage shall be less than the "V Cell Maximum" as shown in table I.
CAUTION: Do not short the test terminal to the input terminal. Accidental momentary grounding or the application of any potential to the test terminal may cause permanent damage. It is suggested that the PTFE test cap be left in place on the test terminal and that a small sharp probe be inserted through the end port of the cap.
3.3.2 Internal current source. With an external 100 ohm precision resistor placed between the test and input/test terminals (in parallel with the indicating cell) and the indicator energized at its rated voltage, the voltage between the test terminal and input/test terminal shall be measured. The voltage shall be within the range of "V Reg 100 Ohms" as shown in table I.
4 IDENTIFICATION
4.1 Indicator. The indicator shall be marked with the following data on the outer surface:
a. Manufacturer's name
b. Manufacturer's model number c. Nominal voltage
d. Nominal power (watts)
e. PIN
f. Coded date
g. Polarity symbol (+) (dc indicators)
5 NOTES
5.1 There is no preferred mounting attitude. Indicator may be mounted on any axis and read directly without removal.
5.2 Indication of elapsed time, for vertical indicators, shall be read from the scale using the lower edge of the moving indicator gap. For horizontal indicators, the elapsed time is read from the left edge of the gap.
5.3 Voltage regulation for 28Vdc and 115Vac indicators is obtained by a regulator, self- contained in the indicator, which is frequency insensitive from 50 to 2,400 HZ.
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