TB 9-6625-2197-40
NOTE
Do not set control box SEQ and RPT switches to TEST
position at same time. RPT will override SEQ switch.
NOTE
Figure 5, CONNECTION A, is used to measure SUM pulses;
CONNECTION B is used to measure DIFF.
(4) Operation of the control box is described in (a) through (e) below:
(a) SEQ switch is momentarily set to GND until characters appear on some of
the displays, then immediately set switch to TEST.
(b) Mode of operation will be seen on the display and will change periodically.
(c) Set SEQ switch to OFF when desired mode of operation is viewed.
(d) Set RPT switch to GND until TI display is lit and immediately set switch to
TEST.
(e) Ensure desired mode of operation is viewed on TI display.
(5) Repeat (3) above to select MODE 1 operation.
(6) Adjust radar test set oscilloscope TRIGGER Level and INTENSITY controls
as necessary to view waveform similar to figure 6, inset A.
(7) Set first pulse leading edge on second vertical graticule line.
NOTE
Pressing
section,
HORIZONTAL
MAIN/DELAYED
pushbutton on radar test set oscilloscope will provide selectable
menu of left or center time reference.
NOTE
Press radar test set oscilloscope ERASE pushbutton when
necessary throughout this procedure.
(8) Measure SUM pulse width.
If pulse width is not between 0.7 and 0.9 s,
perform b (1) below.
(9) Measure SUM pulse spacing. Pulse spacing will be between 2.8 and 3.2 s.
(10) Press Autostore pushbutton to STORE. The two SUM pulses should be stored
on screen display.
(11) Set control box RPT switch and PWR switch to OFF.
CAUTION
Control box PWR switch is set to OFF to prevent accidental
shorting of components when changing from CONNECTION A
to CONNECTION B (fig. 6) and vice versa.
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