c. To set the center frequency of the spectral analysis, click in the Center Frequency and use the multipurpose knobs or
pop-up keypad to set the center frequency.
d. Resolution bandwidth determines how small of a frequency difference can be resolved in the frequency domain output
data. It basically defines the bandwidth of the filters used to do the frequency domain analysis. To set the resolution
bandwidth, click in the Resolution BW entry box and use the multipurpose knobs or keypad to set the resolution
bandwidth.
14. Set the time domain controls:
a. Open the Create/Edit tab.
b. The Time domain controls determine the sample rate and record length of the acquisition. These controls allow you to
change the duration on the acquisition without changing the sample rate. Click in the Resolution entry box and use the
multipurpose knobs to adjust the time interval between data samples of the input waveform.
NOTE. Resolution is the inverse of Sample rate. Adjust resolution to adjust sample rate. Resolution may also cause a
change in record length such that the duration is kept constant at the value selected by the Duration control.
c. To adjust the number of seconds over the duration of the acquired waveform (record length), click in the Duration entry
box and use the multipurpose knobs or pop-up keypad to adjust the duration.
NOTE. Changing duration also changes the record length.
d. Gate position is the position of the phase reference point in the gate with respect to the trigger in seconds. The gate
position and gate duration must be within the acquisition. To set the gate position, click in the Gate Position entry box
and use the multipurpose knobs or pop-up keypad to adjust the gate position.
e. Gate duration and resolution bandwidth are the same. Gate duration is displayed in seconds and resolution bandwidth
in hertz. To set the gate duration, click in the Gate Duration entry box and use the multipurpose knobs or pop-up
keypad to adjust the gate duration.
15. Take cursor measurements:
a. From the toolbar, click the Cursors button to display the cursors and open the Cursor Controls window.
b. Click the Setup button to open the Cursor Setup window.
c. Use the Source drop-down lists to select the channels for the spectral waveform you want to measure.
d. Select the cursor type. For more information, see Taking Cursor Measurements.
e. Click in the X and Y Position entry boxes and use the multipurpose knobs to position each cursor on the waveform to
measure the feature(s) that interests you.
f. Read the results in the cursor readout.
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 multipurpose knobs to align the two vertical cursors to points of interest along the horizontal
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.
How to ?
DPO70000SX, MSO/DPO70000DX, MSO/DPO70000C, DPO7000C, and MSO/DPO5000B Series 613
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