Fluke 5820A, Руководство оператора

Страница: 80 / 272

5820A
Operators Manual
4-22
For example, assume the range limit is 40 mV. If you enter 5 mV with
“auto”selected, the calibrator automatically changes the range limit to 10 mV and
output 5 mV from within the 10 mV range. However, if you start with the 40 mV
range “locked” and then enter 5 mV, the calibrator outputs 5 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
always returns to “auto” after you leave Level Sine mode.
•
MODE Indicates you are in “levsine” mode. Use the softkey to change modes and
open menus for other calibration modes.
4-35. 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
b
.
2. Toggle FREQ CHG 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
b
. After you press
b
, 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 appears 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
CHG 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.