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Optical Sampling Modules
Test
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.
Use the Horizontal
POSITION
knob to position the impulse at the
fi
rst
horizontal division as shown in the following
fi
gure. (This ensures that
post-impulse aberrations are included in the record.)
You may experience signal jitter if you try to display a signal that is not the
fi
rst impulse and is late in relation to time zero.
2.
Adjust the Horizontal
SCALE
knob so that the width of the impulse at its
base is approximately 1/4 to 3/4 of a horizontal division on the display as
shown in the following
fi
gure.
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 than 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.
Figure 30: Proper positioning of the impulse for optimum curve download
228
DSA8300 Performance Veri
fi
cation
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