5080A/SC
Users Manual
14
and then enter 1 mV, the calibrator will output 1 mV from within the 40 mV range.
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.
Sweeping through a Frequency Range
When you change frequencies using the sweep method, the output sine wave sweeps
through a specified range of frequencies, letting you identify the frequency at which the
oscilloscope’s signal exhibits certain behavior (e.g., changes amplitude). 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
.
2.
Toggle FREQ CHANGE to “sweep.” Toggle the RATE to “100 kHz” if you want to
observe a very slow sweep over a small range.
3.
Key in the end frequency; then press
.
After you press
, the signal sweeps through frequencies between the two
values you entered, and the Sweep menu appears on the Control Display as shown
below.
gl031i.eps
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.
Frequency Response Calibration Procedure for an Oscilloscope
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.
Before you start this example procedure, verify that you are running the oscilloscope
option in Levsine mode. If you are, the Control Display shows the following menu.
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