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Performance Tests
4–70
TDS 684A, TDS 744A, & TDS 784A Service Manual
Positive pulse
Negative pulses
Figure 4–28: Triggered Signal Range Test – 300 mV
n. Use the keypad to set the fine scale to 75 mV (press 75, SHIFT, m, then
ENTER).
o. 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 4–29.