ACR Electronics Pathfinder 2 Panduan Dukungan Produk - Halaman 8

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2.2 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