5520A
Operators Manual
8-24
The default range setting is “auto,” which should always be used unless you are
troubleshooting discontinuities in your oscilloscope’s vertical gain. The range setting
will always return to “auto” after you leave LEVSINE mode.
• MODE Indicates you are in LEVSINE mode. Use the softkey to change modes and
open menus for other calibration modes.
8-37. Sweeping Through a Frequency Range
When you change frequencies using the sweep method, the output sine wave sweeps
through a specified range of frequencies. This feature lets you identify the frequency at
which the oscilloscope’s signal exhibits certain behavior; you can quickly see the
frequency response of the oscilloscope. Before you start this procedure, make sure you
are in the MORE OPTIONS menu and the sine wave is displayed on the oscilloscope.
Perform the following procedure to sweep through frequencies:
1. Make sure the output signal shows the starting frequency. If not, key in the starting
frequency; then press E.
2. Toggle FREQ CHANGE to “sweep.” Toggle the RATE to a lower frequency if you
want to observe a very slow sweep over a small range.
3. Key in the end frequency; then press E. After you press E, the signal
sweeps through frequencies between the two values you entered, and the Sweep
menu (“Sweeping from previous to displayed frequency”) appears on the Control
Display.
4. You can let the signal sweep through the entire range, or you can halt the sweep if
you need to record the frequency at a certain point.
To interrupt the sweep, press the softkey under HALT SWEEP. The current
frequency will appear on the Output Display and the MORE OPTIONS menu will
reappear on the Control Display.
Note
When you interrupt the frequency sweep by pressing HALT SWEEP, the
FREQ CHANGE method switches back to “jump.”
5. Repeat the procedure if necessary. For example, if you did a fast sweep, you may
want to pinpoint a certain frequency with a slow sweep over a subset of your
previous frequency range.
8-38. Oscilloscope Frequency Response Calibration Procedure
This sample procedure, which verifies the frequency response on your oscilloscope, is
usually performed after the pulse response is verified.
This procedure checks the bandwidth by finding the frequency at the -3 dB point for
your oscilloscope. The reference sine wave in this procedure has an amplitude of 6
divisions, so that the -3 dB point can be found when the amplitude drops to 4.2 divisions.
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