Rev E TR-220 90 008 088-1
2-17
2.12.2 Mode S Manual Testing
1. Turn the Test Set “ON” by toggling the ON/OFF switch to the ON position.
Ensure the green LED illuminates. Utilize the procedures as outlined in 2.9 to
select the preferred antenna method for the following tests.
2. The Test Set commences the Self Test. “PASS” is displayed briefly if no failures
are detected.
3. Turn the UUT FUNCTION switch to the XPDR position. The Test Set will
automatically determine the transponder capability as being Mode S capable and
display the appropriate start page with the COMM A, B, C, & D capabilities also
listed. The Test Set will display if the transponder reports it is capable of
Enhanced Surveillance (EHS). The Test Set will display the Vertical Status
(Air/Ground) and display the results of an Interrogation Identifier (14) test.
4. Toggle the AUTO/TEST/MANUAL switch to the MANUAL position to begin the
sequence:
5. To advance, toggle the AUTO/TEST/MANUAL switch to MANUAL. The next test
in sequence will commence:
Self Test
PASS
Capab Comm AB EHS
AIR Press A/M II:14
M A /
Testing . . .
Mode A Test initialized.
M A 1234 100%
0.45–20.35– 0.45 PASS
M C /
Testing . . .
Test Complete. Display indicates the UUT
4096 Octal Code (1234), Receiver
Efficiency as a percentage (100%),
Transponder Framing Pulse widths (0.45)
and separation measured in .05 µs
increments (20.35 µs).
n alternating display indicates the Mode A
Reply Delay and Jitter with a P(ass) or
F(ail) indication for each measurement.
**
Mode C Test initialized.
M A Rply 3.11us P
M A Jitter 25ns P
** Denotes a test only available with
Software Revision 5.00 or
reater.
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