How to ? Use a predefined spectral math waveform
NOTE. The cursor readout is displayed under the multipurpose readouts or in the upper right corner
of the graticule area. The cursor units will be in dB or volts for magnitude waveforms and in degrees
or radians for
those measuring phase.
g. Select V Bars, and use the m ultipurpose knobs to align the two vertical cursors to points of interest
along the hor
izontal axis of the waveform.
h. Read the frequency difference between the cursors from the Δ: readout. Read the frequency of
each cursor relative to the zero frequency point from the cursors readout.
Take a cursor measurement
Use the following procedure to take measurements with cursors:
1. To open the Cursor Controls window, press the Cursors button on the front panel, click Cursors
on the toolbar, or select Cursor Setup from the Cursors menu.
2. Select the waveform you want to measure and a Cursor Type
(see page 73) from the control
window.
3. Position the cursors with the multipurpose k nobs.
4. Read the cursor information from the on-screen Position controls.
TIP. Select the cursor mode (Tracking or Independent) in the Cursor Setup control window.
Use a predefined spectral math waveform
The following procedure is an example of setting up the instrument to perform spectral analysis o f a signal.
This example uses the probe compensation signal available on the front panel of the instrument.
1. Connect the probe compensation signal to Ch 1 through a suitable probe.
2. Press Default Setup.
3. Press Autoset.
4. From the toolbar, click Vertical, and select the Chan 1 tab.
5. Click in the Offset entry box, and then use the multipurpose knobs or keypad to set the offset to 900 mV.
6. Click in the Scale entry box, and use the multipurpose knobs or keypad to set the Channel 1 Scale
to 200 mV.
7. From the toolbar, click Math, and select the Math 1 tab.
8. Click the Spectral Mag button.
The instrument sets up a predefined magnitude spectral analysis waveform. Your waveform should
be similar to the one below.
DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series 627
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