16 Analyzing Data
344 InfiniiVision 7000B Series Oscilloscopes User’s Guide
Performing Mask Tests
One way to verify a waveform's compliance to a particular set of
parameters is to use mask testing. A mask defines a region of the
oscilloscope's display in which the waveform must remain in order to
comply with chosen parameters. Compliance to the mask is verified
point- by- point across the display. Mask test operates on displayed analog
channels; it does not operate on channels that are not displayed.
To enable mask test order option LMT at time of oscilloscope purchase, or
order N5455A as a stand- alone item after oscilloscope purchase.
To create a mask from a “golden” waveform (Automask)
A golden waveform meets all chosen parameters, and it is the waveform to
which all others will be compared.
1 Configure the oscilloscope to display the golden waveform.
2 Press the [Analyze] key.
3 Press Features; then, select Mask Test.
4 Press Features again to enable mask testing.
5 Press Automask.
6 In the Automask Menu, press the Source softkey and ensure the analog
channel from which to create the mask is selected.
7 Adjust the mask’s horizontal tolerance (± Y) and vertical tolerance (±
X). These are adjustable in graticule divisions or in absolute units (volts
or seconds), selectable using the Units softkey.
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