this time, it shall not be necessary to readjust any controls that are
inaccessible to the operator during normal use.
22.214.171.124 Operating life. The test set shall have a minimum total operating
of 1000 hours with minimal servicing and replacement of parts.
126.96.36.199 Reliability in mean-time-between-failures (MTBF). The test set shall
have a specified mean [operating) time between failures of 100 hours when
tested in accordance with 4.5.3.
The following conditions shall be used to
3.3.2 Standard conditions.
establish the normal performance characteristics under standard conditions for
performing laboratory bench tests:
Room ambient (30 10C)
Normal ground (10,000 ft. maximum)
Room ambient up to 90 percent relative
Fully charged battery pack (PN 178AS200) or
Input Power Voltage
external power source capable of producing
200 mA of current at 10.0 to 15.0 volts dc
with a maximum ripple voltage of 1 mV rms.
188.8.131.52 Service conditions. The test set shall meet the operating test
requirements of this specification under any environmental service-condition
or combination of conditions specified in MIL-T-28800 for class 2 equipment,
except as modified herein.
The test set, with battery pack (PN 178AS200)
installed, shall meet all operating test requirements of this specification
when tested at the limited temperatures of O to 55C. The test set with
battery pack (PN 178AS200) installed shall meet all electrical requirements
for a minimum of 30 minutes when tested at temperatures of O to -40C under
the following conditions:
The test set, less battery pack (PN 178AS200), shall be stabilized at
required test temperature.
Battery pack (PN 178AS200) shall be charged at 60 ma for 16 hours at
Battery pack (PN 178AS200) shall be placed in test set immediately
after charging and the tests initiated after the battery has been
subjected to the test temperatures for a maximum of 15 minutes.
The battery pack shall meet the requirements of
184.108.40.206.1.1 Battery pack.