5502A
Operators Manual
9-14
Calibrate 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. With this signal, you adjust the oscilloscope as necessary until it meets its
particular specifications for rise time and pulse aberrations.
Subsequent pulse verification, the frequency response is examined by applying a leveled
sine wave and acquiring a frequency reading at the -3 dB point, when the amplitude drops
approximately 30 %.
The Edge Function
The Edge function is used for calibrating the pulse response for your oscilloscope. To
reach the Edge menu, push the softkey below MODE until “edge” shows.
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You can push the MODE softkey to move through the functions in the sequence shown,
or you can push to return directly to the SCOPE menu.
Each option in the Edge menus is given below.
• OUTPUT @ SCOPE terminal (50Ω) Shows the location and impedance of the
signal output. If the signal does not show on the oscilloscope, push . To
disconnect the signal, push .
You cannot change the output impedance in Edge mode.
• TD PULSE Push once to turn the Tunnel Diode Pulser drive signal on, again to turn
the Pulser drive off. This signal sources up to 100 V p-p to drive a Tunnel Diode
Pulser (Fluke Part Number 606522, Tektronix 067-0681-01, or equivalent.
• TRIG If you use the external trigger, use this key to toggle the trigger off and on.
When on, the reading will show “/1” which shows 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 pushing the TRIG OUT key.
• MODE Shows 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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