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Application Tutorials
Tutorial 5: Use Software Filters
Eyeline Display Showing Laser Overshoot
Load the Software Filter
2 Place the 70874A memory card in the front-panel card slot.
3 Display the catalog of files on the memory card by pressing:
Mass Storage
4 Turn the front-panel knob to highlight the file "a_bt248832".
5 Load the file into user-corrections by pressing:
LOAD FILE
This file simulates a 4th-order Bessel-Thomson filter with a cutoff at three-
quarters of the bit rate. This allows you to observe the laser transmitter signal
in a specified bandwidth. This software filter is equivalent to using a hardware
filter, except that trace noise may be suppressed more.
6 Apply the filter data to the traces by pressing:
Trg,Cal, more 1 of 2, usr cor ON OFF ON