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Page Title: Figure 8-14. Calibrated Signal Display
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TM 9-254 8-6. Waveform Reading - Continued (1) Check the calibration of the scope horizontally, using a signal of known frequency.  The output frequency of the CALIBRATOR (9, fig. 8-8) is 1000 Hz with a voltage of 1 volt peak-to-peak. (2) Turn  the  TIME/DIV  OR  DLY  TIME  switch  (3,  fig.  8-10)  to  the  .lms  position.    One  cycle  should  be displayed on the CRT. (3) Rotate the SWP CAL control (16, fig. 8-10) until the displayed waveform of one cycle covers exactly 10 divisions horizontally as shown in figure 8-14. Figure 8-14.  Calibrated Signal Display (4) To  calculate  the  frequency  of  a  signal  you  must  first  find  the  time  of  one  complete  cycle  of  displayed waveform.  To do this you must use the controls of the main triggering amplifier (fig. 8-10). (5) The TIME/DIV switch (3, fig. 8-10) controls the horizontal display time of the oscilloscope. NOTE Whenever you change the input signals to the vertical amplifier or the positioning of the TIME/DIV switch  (3,  fig.  8-10)  it  may  be  necessary  to  adjust  the  LEVEL  knob  (15,  fig.  8-10)  to  stabilize  the displayed signal. 8-20

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