Mask testing setups Select a mask type
Overview
Use the Type controls to choose a mask. Use the standard drop-down list to select a standard for the mask
test. The Mask Polarity control will appear, depending on the standard selected. Use the Mask Polarity
controls to choose whether to test the positive pulse, negative pulse, o r both.
NOTE. The Comm Trigger is designed to work with communications mask and standard testing. Mask
testing automatically uses Communication triggers. You must install the Serial Communications Mask
Testing Option on some instruments before you can access the Comm triggers.
To use
1. Click one of the Type controls to select the mask type.
2. Click More for additional selections.
3. Click the standard drop-down list to select the mask standard.
4. If the Mask Polarity control is displayed, click it to select positive or negative.
Behavior
The type of mask you choose will determine which standards are available from the standard drop-down
list. The standard selected will determine whether the Mask Polarity control is d isplayed.
NOTE. For some masks, you may see a pop-up message that reads, "Consider System Bandwidth when
testing at this bit rate." This message appears if the bandwidth of the measurement system falls below 1.5 –
1.8 times the bit rate of the data signal. Because the T11 committee has published a strict rule o f 1.8 times
the bit rate for e lectrical standards, be aware that useful qualitative information can be gathered at the
current system bandwidth but quantitative rise-time measurements may not be reliable. A Consider System
Bandwidth message will appear for all optical standards, since optical filtering is not available.
Alternatively, you can select Edge Setup from the Trigger menu to improve the s tability.
What do you want to do next?
Learn about the Mask Display control window. (see page 213)
210 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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