5520A
Operators Manual
8-72
8-98. Calibrating the Pulse and Frequency Response on an
Oscilloscope
The pulse response is calibrated with a square-wave signal that has a fast leading edge
rise-time. Using this signal, you adjust the oscilloscope as necessary until it meets its
particular specifications for rise time and pulse aberrations.
Following pulse verification, the frequency response is checked by applying a leveled
sine wave and acquiring a frequency reading at the -3 dB point, when the amplitude
drops approximately 30%.
8-99. The Edge Function
The Edge function is used for calibrating the pulse response for your oscilloscope. To
reach the Edge menu, press the softkey under MODE until “edge” appears.
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Each option in the Edge menu is described below.
• OUTPUT @ SCOPE terminal (50Ω) Indicates the location and impedance of the
signal output. If the signal does not appear on the oscilloscope, press O. To
disconnect the signal, press Y.
You cannot change the output impedance in Edge mode.
• TRIG If you are using the external trigger, use this key to toggle the trigger off and
on. When on, the reading will show “/1” which indicates that the external trigger is
at the same frequency as the edge output.
The external trigger can be useful for many digital storage oscilloscopes that have
difficulty triggering on fast rise time signals.
You can also toggle the trigger off and on by pressing T.
• MODE Indicates you are in Edge mode. Use the softkey to change modes and open
the corresponding menus for the other four oscilloscope calibration modes.
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