Tektronix DSA8200 Series User Manual

Command Groups
Mask Command G
roup
Mask commands control standard masks, user-defined masks, and testing against
masks. A mask is a set of polygonal regions on the screen. Every vertical line on
the screen in
tersects the polygon in zero, one, or two places, but never in more
than two places. (A vertical line that intersects a vertical mask border is c ounted.)
You have to bre ak up more complicated polygons into two separate masks. Unlike
limit testing, the inside of a mask is the region where waveform data would not
normally fall. A telecommunications standard requires up to eight of these masks.
Pulse standards always have two masks. Standards with eye patterns usually
have thre
e masks, but some have four.
You use the commands in the Mask Command Group to do the following:
Specify the waveform source to test and the mask to use.
Specify whether to use, and the size of, mask margins, which allow you to
shrink or expand an existing set of polygons by a specified
percentage.
Specify whether to display a readout of hits and the mask on screen. Options
also exist for autosetting the incoming waveforms to match the mask y ou
choose.
Select industry-standard masks that support a variety of electrical and optical
communication standards.
Define and edit your own cus tom mask; create an entirely new mask, or use a
standard mask as a starting reference, and edit it to meet your needs.
Enable, disable, or res et the mask counts. Once you turn on mask counting, it
remains on until you explicitly turn it off.
Set the color for the mask polygon.
Command
Description
MASK?
Return all mask parameters
MASK:AUTOSet:MODe Sets or returns the mask autoset mode.
If A UTO is set, a mask autoset will
automatically be done after a standard mask
is selected; if MANual is set, mask autoset
for a standard mask runs only if the user
presses the AUTOSET button or sends the
AUTOSet EXECute command.
MASK:AUTOSet:HILow:METHod Sets or returns the method, Mean or Mode,
that a Mask Autoset uses to determine the
High and Low values
MASK:COLOr Sets or returns the mask color
MASK:COUNt Clear mask counts and source data, and
restart c ounting
Returns all the values for the mask count
parameters
DSA/CSA/TDS8X00/B Series Programmer Manual 2-25

Tektronix DSA8200 Series Specifications

General

Brand	Tektronix
Model	DSA8200 Series
Category	Test Equipment
Language	English