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WFM 1125 Option 0A/0B/0C/0D Service Manual
Vertical offset:
21. Align the –350 mV level of the signal with the center graticule on the
oscilloscope.
22. Change the oscilloscope CH2 vertical offset to 350 mV.
23. Verify and adjust the A10 R542 to align the 350 mV level with the center
graticule on the oscilloscope.
24. Change the oscilloscope CH1 vertical offset to –350 mV.
25. If the –350 mV level is within " 0.5 division from the center graticule, go to
next step. If not, go back to step 21.
26. Press the TIMING SIGNALS button on the TSG1001 front panel to set the
TIMING SIGNALS to BOWTIE.
27. Change the oscilloscope settings to:
Waveform:
. . . . . . . . . . . . . . .
Vertical scale:
. . . . . . . . . . . . .
Vertical offset:
Horizontal scale:
Record length :
28. Press the MATH REF button on the oscilloscope front panel, and then press
the main and side menu buttons in the following order to create a Math
waveform:
Change Math waveform definition ³ Dual Wfm Math ³ Set 1st Source to
[Ch1] ³ Set operator to [–] ³ Set 2nd Source to [Ch2]
29. Change the oscilloscope settings to:
Waveform:
. . . . . . . . . . . . . . .
Zoom:
. . . . . . . . . . . . . . . . . . .
Vertical scale:
. . . . . . . . . . . . .
Horizontal Scale:
30. Observe the Bowtie display on the oscilloscope and verify and adjust the
A10 DL210 so that the skew is within 1 ns (the marker on the display
indicates 1 ns).
. . . . . . . . . . . .
–350 mV
CH1 and CH2
100 mV/div for CH1
100 mV/div for CH2
. . . . . . . . . . . .
0 V for CH1 and CH2
1 ms/div
. . . . . . . . . . .
. . . . . . . . . . . .
5000 points
CH1 and CH2 to Off
On
100 mV/div (5.0 X Vert) for Math1
5 ms/div (0.2X Horz)
. . . . . . . . . .
Adjustment Procedures
5-9
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