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|  MIL-T-22913C(OS)
230 ohm plus or minus 10 percent resistor together. Connect the other
side of the resistor to an output terminal of the 5-10 volt 400 Hz single
phase power supply. Connect the other terminal of the power supply to
either 20 or 21 of P152. Adjust the power supply to 7 volts rms plus or
minus 10 percent. Measure the voltage drop across each switch in the
timer while the switch is carrying load current. The total drop in each
timer circuit while the circuit is closed shall not exceed the limits
specified in 3.3.1.3.4.
4.4.5.2 Contact bounce. Using the identical test setup specified in
4.4.5.1, measure the duration of contact bounce which may occur in the
closure of each circuit. Contact bounce may be observed and measured
by placing the input terminals of an oscilloscope, capable of driven-sweep
operation, across either the switch being tested or the load impedance
connected in series with the switch. A standard one kHz per second oscil-
lator may be used to calibrate the oscilloscope. The duration of the
contact bounce in any timer circuit shall not exceed the limit specified
in 3.3.1.3.5.
4.4.6 Potentiometer test. The potentiometers shall be checked for
compliance with 3.3.2.2(d), 3.3.2.2(e), 3.3.2.2(f), 3.3.2.3(d), 3.3.2.3(e),
and 3.3.2.3(f).
4.4.7 Operating life. For this test, a new timer may be used or a
timer that has been under test and overhauled may be used. Use the test
setup specified in 4.4.5.1 and, in addition, connect a source of 90 volts
plus or minus 3 percent, 400 Hz plus or minus 2 percent to the voltage
supply terminals of the 90 volt potentiometer, and a source of 14 volts
plus or minus 3 percent, 400 Hz plus or minus 2 percent to the voltage
supply terminals of the 14 volt potentiometer. Operate the timer for a
total of 199 hours, always maintaining the input voltages and frequency
within the specified limits. At the end of each 45 minutes plus or minus
5 minutes of operation, stop the timer. If the manufacturer so requests,
the timer shall be allowed to cool to ambient temperature before it is again
started and operated as described above. Once during each 10 hours of' opera-
tion, the timer operation shall be checked as specified in 4.5. During this
test, no maintenance shall be performed on the timer. While the timer is
operating in the steady state condition, performance shall be within limits
specified in 3.3.1.1(c), 3.3.1.3, and 3.3.3.1. When the timer is started,
performance shall be within limits specified in 3.3.1.2.
4.5 Quality conformance inspection. Each timer delivered under contract
shall be subjected to the following tests and examinations. Failure to meet
any requirement specified herein shall be considered cause for rejection.
4.5.1 Test conditions. Unless otherwise specified, the timer shall be
subjected to quality conformance tests under the following conditions:
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