A-A-52176
3.16 Starting torque. The maximum value of the minimum torque required to initiate shaft rotation shall be 0.5 ounce-inch. The maximum value of the starting torque shall not increase to more than 150 percent of the initial value.
3.17 Running torque. The maximum value of the minimum torque to sustain shaft rotation shall be 0.4 ounce-inch. the maximum value of running torque shall not increase to more than 150 percent of the initial value.
3.18 Insulation resistance. The initial insulation resistance of the resistors shall not be less than 1,000 megohms. After degradation, the insulation resistance shall not be less than 500 megohms.
3.19 Dielectric withstanding voltage. The resistors shall be capable of withstanding a test voltage of 750 volts rms for resistors of 1.125-inch diameter and smaller or 1,000 volts rms for resistors having diameters larger than 1.125 and exhibit no damage, arcing, or breakdown. The leakage current shall not exceed 1 milliampere (MA).
3.20 Function-conformity. The function-conformity shall be independent linearity.
3.21 Function-conformity tolerance. The function-conformity tolerance shall be the value specified in Table IV. The resistors shall be capable of not exceeding the specified degradation value of IV for function-conformity tolerance after being subjected to a previous series of environmental or mechanical tests.
3.22 Mechanical backlash. The operating shaft shall not move in excess of the applicable value specified in Table VII without moving the contact arm.
TABLE VII. Mechanical backlash.
|
Function-conformity tolerance |
Mechanical backlash |
|
Percent |
(°) |
|
1.0 |
0.5 |
|
0.5 |
0.25 |
|
0.25 |
0.1 |
|
0.10 |
0.1 |
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