TB 9-6625-2163
19. Mode 4 Reply Evaluator
a. Performance Check
NOTE
PUSH TO TEST switch must be pressed and released several
times to observe results.
(1)
Connect RTS oscilloscope CH 2 probe to A2TP1 (fig. 2).
(2) Press PUSH TO TEST switch and turn to LOCK position. If width of pulse on
CH2 is not between 267 and 271 s, perform b(1) below.
(3) Disconnect RTS oscilloscope CH1 probe from A1TP3 (fig. 2) and connect to
(4) Press oscilloscope AUTO-SCALE pushbutton and set TIME/DIV switch
to 5 s. Position trailing edge of waveform on CH2 to align with second vertical graticule
line.
(5) Press PUSH TO TEST switch and turn to LOCK position.
NOTE
The next two tests are performed much easier if the
after each measurement to clear screen.
(6) Press PUSH TO TEST switch. Pulse will momentarily appear at trailing edge
of pulse on CH 2. If pulse width is not between 11.8 and 12.2 s, perform b(2) below.
(7)
Disconnect oscilloscope CH 1 probe from A2TP2 (fig. 2) and connect to A2TP3
(8) Press PUSH TO TEST switch. Negative going pulse will appear on CH 1 each
time PUSH TO TEST switch is pressed and ACCEPT light will glow.
(9) On RTS Menu 8 set RF selection to 6, then step INT GATE: #INHIBITED:
selection from 1 to 10. Press TI PUSH TO TEST switch for each step and observe that
REJECT or ACCEPT light glows. ACCEPT light should glow consistently to 6, become
intermittent from 7 through 9 and extinguished upon reaching 10 (solid REJECT
indication).
(10) Set INT GATE: #PASSED: selection to 16 and #INHIBITED: to 0.
(11) Set MODE 4 DIR/RAD switch to DIR. Press PUSH TO TEST switch and
observe that ACCEPT light glows.