TDS5000B Online Programmer Guide
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LIMit:TEMPlate:TOLer-
ance:VERTical
Sets or queries the amount, in units
of vertical divisions, by which the
source waveform is varied vertically
when creating the destination wave-
form
Limit?
Returns all settings for the Limit com-
mands
Mask Command Group
Use the commands in the Mask Command Group to compare incoming
waveforms against standard or user --defined telecommunications
masks. Standard masks are only available when option SM is installed.
Without option SM, you need to define your masks. When the instru-
ment detects waveforms that fall inside or outside of the mask limits, it
can perform tasks such as generating hard copy, saving the waveform,
emitting a beep or an SRQ, stopping and waiting for your input, send-
ing an email message with specified data, logging the time/date of the
acquired waveform, or some combination of these actions.
A mask is a set of polygonal regions on the screen. Every vertical line
of the screen intersects the polygon in zero, one, or two places, but nev-
er in more than two places. (A vertical line that intersects a vertical
mask border is counted.) You have to break up more complicated poly-
gons into two separate segments. 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 three masks, but some have four.
You use the commands in the Mask Command Group to do the follow-
ing:
H Specify the waveform source to test and the mask to use
H 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.
H Specify whether to display a readout of hits and the mask on
screen. Options also exist for auto fitting the incoming waveforms
to match the mask you choose.
H Select industry--standard masks that support a variety of electrical
and optical communication standards (available only with option
SM).
H Define and edit your own custom mask; create an entirely new
mask, or use a standard mask (option SM only) as a starting
reference, and edit it to meet your needs.
H Enable, disable, or reset the mask counts. Once you turn on mask
counting, it remains on until you explicitly turn it off.
Option SM also provides communication trigger commands that you
can use in conjunction with the mask commands, such as TRIG-
ger:A:TYPe Communication. Refer to the Trigger Command Group
and
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