MIL-R-83407C
4.5.8 Contact resistance (see 3.11). Relays shall be tested in accordance with method 307 of MIL-STD-202. The following details and exceptions apply:
a. Method of connection: Between the measuring apparatus and the relay terminals (for relays with wire lead terminals, this measurement shall be made .5 ±.094 inch (12.7 ± 2.39 mm)from the emergence of the lead from the relay). Voltage-sensing leads shall be connected in such a way as to exclude the resistance of the current-carrying leads.
b. Test load: 100 mA at 6 V dc.
c. Points of measurement: All mated contacts in their closed position; the coil shall be energized with rated voltage if necessary to effect contact closure.
d. Number of activations prior to measurement: None.
e. Number of test actuations: Three (the contact load shall not be applied during contact transfer). For conformance inspection, one test actuation shall be made.
f. Number of measurements per actuation: One in each closed contact position.
4.5.9 Operate and release times (see 3.12). The operate and release times shall be measured using an oscilloscope. Rated voltage shall be applied to the coil. The circuit shown in figure 1, or equivalent, shall be used. For qualification inspection, timing measurements shall be made on all contact sets. For conformance inspection, all open contacts may be wired in series, and all closed contacts may be wired in parallel.
NOTE: The horizontal scan rate of the oscilloscope shall show the required pertinent data.
FIGURE 1. Typical circuit for operate and release times.
4.5.10 Coil inductance (when specified) (see 3.1 and 3.13). Coil inductance shall be measured at 1,000 Hz, using a conventional impedance bridge.
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