Tektronix 784A Manual do Utilizador descarregar pdf (Página 142)

Performance Tests

4–66

TDS 684A, TDS 744A, & TDS 784A Service Manual

g. Press the main-menu Bandwidth.

h. Select 250 MHz from the side menu.

i. Press the main-menu Fine Scale.

j. Use the keypad to set the fine scale to 282mV (press 282, SHIFT, m,

then ENTER).

k. Press HORIZONTAL MENU.

l. Press the main-menu Horiz Scale.

m. Use the keypad to set the horizontal scale to 200 ns (press 200, SHIFT,

n, then ENTER).

3. Check Jitter vs. Signal Amplitude

a. Set up equipment for Jitter Test. See Figure 4–25.

H Connect one of the rear panel composite outputs marked COMPST

on the TSG121 through a 75 W cable and a 75 W terminator to the

CH1 input of the TDS.

H Press the 100% FIELD control (the fourth TSG121 front-panel

button from the left) of the PAL signal source.

PAL Signal

Source

Digitizing Oscilloscope

75  Cable

75 

Terminator

COMPST

Figure 4–25: Jitter Test Hookup

b. CHECK that the oscilloscope lights up its front panel TRIG’D LED and

it displays the waveform on screen. See Figure 4–26.

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Tektronix 784A Manual do Utilizador Página 142