Optical Sampling Modules
CSA8000 & TDS8000 Instruments and Sampling Modules
4–93
Follow this procedure to make the minimum optical bandwidth and reference
receiver frequency response checks:
NOTE
. The minimum optical bandwidth is not checked for the 80C03 Optical
Sampling Module. If testing this module, go to step 10 in this procedure and
continue with this procedure to check the reference receiver frequency responses.
1. In the Vert Setup dialog box, set Bandwidth to 12.5 GHz, for an 80C01 and
80C02 optical sampling module. Set bandwidth to 20 GHz for an 80C04 and
80C05 optical sampling module.
2. Use the Horizontal POSITION control to position the impulse at the first
horizontal division. (This ensures that post-impulse aberrations are included
in the record.) See Figure 4–27.
You may experience signal jitter if you try to display a signal that is not the
first impulse and is late in relation to time zero.
3. Adjust the Horizontal SCALE control so that the width of the impulse at its
base is approximately 1/4 to 3/4 of a horizontal division on the display. See
Figure 4–27.
NOTE
. If the width of the impulse is much greater than 3/4 of a horizontal
division, the resulting Fourier transform will not have enough frequency
resolution; if the width is much smaller that 1/4 of a horizontal division, the
amount of samples that fall on the impulse may be too coarse, resulting in
quantum errors in the resulting Fourier transform.
Procedure
Содержание CSA8000 Series
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