ACR Electronics Pathfinder 2 Посібник з підтримки продукту - Сторінка 8
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Друкувати сторінку2.2 Activation, Operation, Test
Activation of the SART is by a three-position switch (ON/OFF/Test),
which is operated by pushing and rotating the spool on which the lanyard
is wound.
Switching the SART to ON breaks a seal, showing that the unit has been
operated. The TEST position allows the SART to be functionally tested
without breaking the seal. Note that TEST on the switch is spring loaded
to OFF. This ensures the switch is not left in the TEST position as this
would drain the battery pack.
When activated the SART has three Modes of operation. These are:
Receive - waiting for a valid interrogation.
Reply -
replying to a valid interrogation
Test -
self-test sequence that checks both indicator lights
and the buzzer.
2.3 Sequence of Operations
The SART has a primary indicating system and secondary indicating
system. The primary system is the indicator lights and the secondary
system is the buzzer.
When the switch is set to ON, the SART immediately enters the Test
Mode. Here both yellow and green lights and the buzzer are tested. Note
that in noisy environments it may be difficult to hear the buzzer. After
about one second the SART goes to Receive Mode. This is shown by the
yellow light flashing slowly.
The SART remains in the Receive Mode until it detects a radar pulse. It
then switches to the Reply Mode and transmits a series of pulses. These
pulses will appear on the interrogating radar display as a series of arcs
leading away from the SARTs position. The Reply Mode is indicated by
both SART lights flashing rapidly and the buzzer emitting a rapid pulsed
sound at about one second intervals. This sequence is repeated each time
a radar interrogates the SART. When the interrogation stops the SART
automatically returns to the Receive Mode.
With a fully charged battery pack the SART will operate in Receive
Y1-03-0154 Rev. A
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