Figure 1-11: Measurement Of Channel Delay - Tds 684C Shown - Tektronix TDS 500D Technical Reference

4
Read results.
1
Display the waveforms.
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2
Locate the time reference
points for these waveforms.
Figure 1–11: Measurement of channel delay – TDS 684C shown
g. Check against limits: CHECK that the cursor readout on screen is
≤100 ps for the TDS600C or ≤50 ps for the TDS 500D, TDS694C,
TDS700D, and TDS714L.
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 (use AX1 and AX2 instead of CH3 and CH4 if your
TDS model is so equipped). Write down these three numbers in the first
measurement column of Table 1–5. Note that these numbers may be
either positive or negative.
j. Repeat the procedure from step 1.c through 2.e.
k. Again use the cursors to measure the skew from CH1 to CH2, CH1 to
CH3, and CH1 to CH4. Write down these numbers in the second
measurement column of Table 1–5. Note that these numbers may be
either positive or negative.
l. Add the first CH1 to CH2 skew measurement to the second CH1 to CH2
skew measurement and divide the result by 2. Use Table 1–5.
3
Align each cursor to the time
reference points
Performance Tests
1–51