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Masks
R&S
®
RTM20xx
122
User Manual 1317.4726.02 ─ 01
9 Masks
Masks are used to determine whether the amplitude of a signal remains within specified
limits, e.g. to detect errors or test compliance of digital signals.
9.1 About Masks
9.1.1 Masks
A mask is specified by an upper and a lower limit line. The signal must run inside these
limit lines, otherwise a mask violation occurs.
A new mask is created from an existing signal: Mask limits are created by copying the
waveform, and the limits are moved and stretched. The result is a tolerance tube around
the signal that is used as mask.
Once a mask has been defined, the copied waveform envelope is kept in the instrument
until the next mask is defined or loaded. The settings for stretch and move are not kept.
If you want to keep the complete mask definition, or you need more than one mask, you
can save the mask to and load from any storage device - internal memory or external
USB flash device.
It is also possible to copy the saved masks to another storage device with "Export/Import
Masks". In an export/import operation, the name of the target file can be changed, so you
can copy and rename the file in one operation. You can also change the target file format
and convert the data during export/import. To copy a mask, use FILE >"Import/Export
Masks".
See also:
●
chapter 9.1.3, "File Formats for Masks"
●
chapter 13.2.1.2, "Importing and Exporting Data"
9.1.2 Mask Testing
The mask test analyzes whether tested signal runs inside the mask. The overall test result
is shown in the results table:
left column
= number of tested acquisitions and test duration
middle column = number of passed acquisitions (green) and number of failed acquisitions (red)
right column
= percentage share of passed and failed acquisitions
During a mask test, various actions can be executed when mask violations occur: notifi-
cation by a sound, stop of acquisition, printout or saving a screenshot, saving the wave-
form data.
About Masks