MIL-R-83407C
4.5.11 Contact noise (when specified) (see 3.1 and 3.14). Contact noise shall be measured using the test circuit shown in figure 2. The relays shall be operated with rated voltage at a rate of 60 to 100 Hz with "on" and "off" time approximately equal. The input filter bandwidth of the oscilloscope shall be set at 600 Hz to 100 kHz. An oscilloscope, such as a Tektronix Incorporated type 561A, with type 2A61 plug-in or equivalent, shall be used, with its time scale adjusted to 2 ms per centimeter and its gain control adjusted for adequate deflection. The peak to peak voltage shall be measured and the oscilloscope trace shall be recorded using an oscilloscope record camera.
FIGURE 2. Contact noise test circuit.
4.5.12 Thermal EMF (when specified) (see 3.1 and 3.15). Thermal EMF shall be measured on each contact which closes when the relay is energized and deenergized respectively. Rated voltage shall be used to energize the relay. Each thermal EMF measurement shall be made for approximately 30 minutes after the relay is energized or deenergized. When the relay incorporates more than one contact pole, as many as two closed contacts may be connected in series and measured at a given time. A suitable test circuit is shown in figure 3 for two contacts in series.
FIGURE 3. Thermal EMF test circuit.
4.5.13 Capacitance (when specified) (see 3.1 and 3.16). Relays shall be tested in accordance with method 305 of
MIL-STD-202. The following details apply:
a. Test frequency: 1 kHz.
b. Points of measurement: See 3.1.
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