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Performance Tests
4–40
TDS 684A, TDS 744A, & TDS 784A Service Manual
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.
(Press SELECT to switch between the two cursors.) See Figure
4–10 on page 4–40.
H Read the measurement results at the D: cursor readout, not the @:
readout on screen.
Locate the time reference
points for these waveforms.
2
Display the waveforms.
1
Read results.
4
Align each cursor to the time
reference points
3
Figure 4–10: Measurement of Channel Delay – TDS 684A Shown
g. Check against limits: CHECK that the cursor readout on screen is
≤100 ps for the TDS 684A or ≤50 ps for the TDS 744A/784A.
h. If the channel skew is within the limits, enter time on the test record and
proceed to step 3. Otherwise, proceed with steps i through p.
i. Use the cursors to measure the skew from CH1 to CH2, CH1 to CH3,
and CH1 to CH4. Write down these three numbers in the first measure-