Performance Tests
4–40
TDS 500B, 600B and TDS 700A Service Manual
724A, and 744A, push the front-panel ZOOM button, press the
side-menu On button, set the horizontal SCALE to 250 ps, and be sure
the vertical scale factor is kept at 1.0X and the horizontal scale factor is
2.0X.
c. Save a CH 2 waveform: Press CH 2. Be sure the vertical scale factor is
kept at 1.0X. Then press save/recall WAVEFORM. Now, press the
main-menu button Save Wfm; then press the side-menu button
To Ref 2.
d. Save CH 3 (AX1 on the TDS 520B, 620B, 680B, and 724A) waveform:
H Move the coupler from CH 2 to CH 3, so that CH 1 and CH 3 are
driven. Press WAVEFORM OFF. Press CH 3. Be sure the vertical
scale factor is kept at 1.0X. Then press the side-menu button
To Ref 3.
e. Display all test signals:
H Press WAVEFORM OFF to remove CH 3 (AX1 on the TDS 520B,
620B, 680B, and 724A) from the display.
H Display the live waveform. Move the coupler from CH 3 to CH 4,
so that CH 1 and CH 4 are driven. Press CH 4 to display. Be sure
the vertical scale factor is kept at 1.0X. See Figure 4–11 on page
4–41. (Use AX1 and AX2 instead of CH3 and CH4 on the TDS
520B, 620B, 680B, and 724A)
H Display the reference waveforms. To do this, press the front-panel
button MORE. Press the main-menu buttons Ref 2 and Ref 3. You
may notice their overlapping ground reference indicators. See Figure
4–11 on page 4–41.
f. Measure the test signal:
H Locate the time reference points for these waveforms. Do this by
first identifying the point where the rising edge of the left-most
waveform crosses the center horizontal graticule line. Next, note the
corresponding time reference point for the right-most waveform. See
Figure 4–11 on page 4–41.
H Press CURSOR.
H Press the main-menu button Function; then press the side-menu
button V Bars.
H Press CLEAR MENU.
H Align one V bar cursor to the time reference point of the left-most
waveform edge and the other cursor to the time reference point of the
right-most waveform edge by rotating the General Purpose knob.
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