Tektronix 2445B User Manual

Controls, Connectors, and Indicators
Positions the delta B-Sweep delay or time cursor
{dashed vertical line) when either At or 1/At is active.
When AV is active, the A control positions the delta
cursor (dashed horizontal line).
When a Save mode is active, A defines each character
in a setup name definition and each attribute field in a
sequence step definition.
When MEASURE is active, A selects items in the menu
and defines characters in event-count definition displays.
With the WR, A defines characters in word-definition
displays.
With the available TV enhancement, the control
nomenclature includes "FLD LINE #." The control
selects specific line numbers within a video field for
triggering the A Sweep when trigger Coupling is set to
FLD 1, FLD 2, or alternate FLD 1-FLD 2. Possible line
numbers range from 1 to the maximum number of lines
per frame in the television signal. Rotating the control
clockwise increases the line number; rotating it
counterclockwise decreases the line number. Increasing
the line number above the number of lines in a field or
decreasing the number below the minimum automatically
sets the line number to the minimum or the maximum in
the other field and selects the opposite FLD 1 or FLD 2
coupling. In ALT, the coupling does not change and line
numbers are limited to the numbers shared by both
fields. See TV EXER 61 and TV EXER 62 in Appendix A
to define the desired line number format. For example,
the lines in a 525-line, interlaced-scan signal can be
numbered:
...! 1 2 ... 262 263 I 1 2 ... 261 262 I...
or
... 11 2 ... 262 263 I 264 265 ,. . 524 525 I...
With FLD 1 or FLD 2 trigger coupling, the readout
displays the selected line number. The line number
readout is followed by a A symbol if the A FLD LINE
# control is directed to line number selection. If the A
symbol is not present, the control is directed to
another function and the line number is fixed, The
control is redirected to line-number selection or back
to a A function by pressing a Trigger Coupling button
or the respective A button(s).
36) A Control
5-18
2465B/2455B/2445B Operators

Tektronix 2445B Specifications

General

Brand	Tektronix
Model	2445B
Category	Test Equipment
Language	English