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90-volt potentiometer, potentiometer 154 |
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|  MIL-T-22913C(OS)
3.3.1.6 Operating life. The timer shall have a useful life of at least
200 hours without lubrication or overhaul.
3.3.2 Product characteristics
3.3.2.1 Adjustment. The timer shall be designed so that the sequence
of circuit switching can be adjusted through 360 degrees. The length of
switch closure time for each circuit can be adjusted as defined in Table
III.
TABLE III - PULSE LENGTH ADJUSTMENT TABLE
*The sum of the pulse length adjustment for circuits 6 and 7 shall equal.
the time for one cycle of potentiometer operation.
3.3.2.2 90-volt potentiometer, potentiometer 154. Potentiometer 154
shall be capable of continuous rotation and shall have the following
characteristics:
(a) Wattage rating. Three watts minimum, continuous at 154 degrees
centigrade.
(b) Continuity. Wiper shall maintain contact with winding through
360 degrees of rotation.
(c) Tap points. The potentiometer shall have four tap points on its
winding as specified in the following: Resistance between tap points 5000
ohms plus or minus 5 percent.
(d) Tap position. Zero degrees; 90 degrees plus or minus 2 degrees;
180
degrees plus or minus 2 degrees; 270 degrees plus or minus 2 degrees.
The
end of the winding shall be connected to the start of the winding at
the
zero degrees tap. The end of the winding shall be within two mechani-
cal
degrees of the start of the winding.
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