How to ? Define a spectral math waveform
7. Under Source, select the tab and channel number for the source waveform.
TIP. If you want to redefine your waveform, click the Clear button, and repeat the above steps.
8. To display your spectral waveform, click Apply.
9. Set the magnitude scale:
a. Click the Magnitude button.
b. OpentheVertAxistab.
c. Under Scal
e, click to select the vertical scale factor.
Linear. Displays magnitude using units equal to the source units.
dBm. Sets the reference level offset to predefined values for dBm; see next step.
dB. Displays magnitude using the log scale, expressed in dB relative to the reference level offset.
TIP. Yo u can also adjust the scale and position by clicking the waveform handle and using the
multipurpose knobs.
d. To set the reference level, click in the Level entry box, and use the multipurpose knobs or p op-up
keypad to set the reference level.
TIP. Reference level is the value at the top of the display screen. It only applies to magnitude
wave
forms. Adjusting the reference level positions the waveform with respect to the top of the display,
but does not change the position of the waveform with respect to its ground reference.
e. To s
et the reference level offset, click in the Level Offset entry box, and use the multipurpose
knobs or pop-up keypad to set the offset.
TIP. Offset determines where zero dB is in the output waveform. Changing offset moves the waveform
with respect to its ground reference. When the input is equal to the offset, it will display as zero
dB in the output.
624 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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