Revision A
T-48 90 008 026
2-21
2.12.1 Pulse
Width,
Spacing,
and Data Pulse Test Example
As an example, the operator of an ATCRBS transponder selects 1234 as the 4096 code. Turn the Test Set
“ON” by pressing the
INTERROGATE
button. The Test Set will automatically determine an ATCRBS
only transponder is transmitting. Press the
TEST
button to initialize the manual sequence of tests.
MODE 3A Test Initialized. Test Set also performs Framing Pulse
Width and Data Pulse Tests. With 1234 entered, the T-48 will measure
Framing Pulses, their width, and their spacing. The Test Set will also
measure each Data Pulse in their time slot and their separation (D4, C2,
C1, B2, and A1).
Display indicating no failures.
Table 2-3 contains each parameter and their failure criteria.
PARAMETER
NORMAL
INDICATION
LIMITATIONS
Framing Pulse Width
.45 µs
± .1µs
Framing Pulse Separation
20.3 µs
± .1µs
Data Pulse Width
.45µs
± .1µs
Data Pulse Separation
1.45µs
± .1µs
Pulse Width and Spacing Criteria
Table 2-3
[End of Page]
MODE 3A & SLS
TESTING . . .
MODE 3A
1234 100% REPLY
