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Performance Tests
4–74
TDS 684A, TDS 744A, & TDS 784A Service Manual
Figure 4–33: 60 Hz Rejection Test Result – TDS 684A Shown
6. Check Line Count Accuracy.
a. Set up oscilloscope for Line Count Accuracy Test.
H Press WAVEFORM OFF.
H Press CH1.
H Press HORIZONTAL MENU.
H Press the main-menu Record Length.
H Press the side-menu –more– until you see the appropriate menu.
H Press the side-menu 5000 points in 100divs.
H Press the main-menu Horiz Scale (/div).
H Use the keypad to set the horizontal scale to 200 ns (press 200,
SHIFT, n, then ENTER).
b. Check Line Count Accuracy.
H Connect a composite output signal from the rear of the PAL signal
source (labeled COMPST on the TSG 121) to the CH1 input
through a 75 W cable and a 75 W terminator. See Figure 4–34.