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Performance Tests
TDS 684A, TDS 744A, & TDS 784A Service Manual
4–69
b. Press WAVEFORM OFF.
c. Press HORIZONTAL MENU.
d. Use the keypad to set horizontal scale (/div) to 50 ms (press 50, SHIFT,
m, then ENTER).
e. Press SHIFT; then press ACQUIRE MENU.
f. Press the main-menu Stop After.
g. Press the side-menu RUN/STOP button only.
h. Press the main-menu Mode.
i. Press the side-menu Sample.
j. Press RUN/STOP.
k. Press VERTICAL MENU.
l. Use the keypad to set fine scale to 300 mV (press 300, SHIFT, m, then
ENTER).
m. CONFIRM that the TRIG’D LED stays lighted and that the waveform
on screen is stable. That is, it does not move horizontally or vertically.
Also, CONFIRM that the waveform on the screen has one positive pulse
and a number of negative pulses. See Figure 4–28.