TB 9-6625-2197-50
(40) Repeat (2) and (3) above to select MODE C operation.
NOTE
Step (41) below consists of both SUM and DIFF pulses.
(41) Measure SUM and DIFF pulse widths (fig. 6, inset G). The first pulse must
have a pulse width between 0.7 and 0.9 s; if not, perform b (1) below. The second pulse
width will be between 0.7 and 0.9 s; if not, perform b (2) below.
(42) Measure the pulse spacing between the first and second pulse. Pulse spacing
will between 1.8 and 2.2 s (fig 6, inset G).
(43) Set oscilloscope TIME/DIV switch to 5 s and press oscilloscope ERASE
pushbutton and then press Autostore pushbutton to STORE to establish a new autostore
(44) Place leading edge of first pulse on second vertical graticule line.
(45) Measure MODE C pulse spacing. Pulse spacing will be between 20.8 and 21.2 s.
(46) Set control box RPT switch to OFF.
NOTE
Steps (47) through (55) below utilize a single sweep, triggered
by the control box. Because of the "BURST OPERATING
MODE" of the TI, one pulse train is sent each time LAMP
TEST is pressed. TI resets after 2.5 seconds of display time.
(47) Position oscilloscope controls for parameters as listed in (a) through (d) below:
(a) Display to CH 2.
(b) TRIGGER SOURCE to 2.
(c) TIME/DIV to 500 ns.
(d) Press Autostore pushbutton to STORE and press ERASE pushbutton.
NOTE
Press and release TI LAMP TEST pushbutton to initiate
MODE 4 simulated word.
(48) Press and release LAMP TEST pushbutton and adjust
oscilloscope
(49) Measure MODE 4 (SUM) pulse width. If pulse width is not between 0.4 and 0.6 s,
perform b (3) below.
(50) Measure pulse spacing. Pulse spacing will be between 1.8 and 2.2 s.
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