Defining New Traces - Tektronix 11801C User Manual

Trace Definition and Management

Defining New Traces

3 206
You define traces on a window time base using the Window icon,
described on page 3 225.
Defining Traces Using the DefTra Icon
You enter trace expressions using the DefTra icon. A DefTra icon appears
above the top right corner of the graticule or graticules on the display. Touch
the DefTra icon above the graticule on which you want to define a new
trace. When you touch the icon, a blank DefTra pop up menu is displayed.
This pop up menu covers the entire display, as shown in Figure 3 102.
You use the selectors of the DefTra pop up menu to type" your trace ex
pression. As you type, the trace expression you are building appears at the
top of the pop up menu. The Back Space selector lets you correct errors as
you type. When your trace expression is complete, touch the Enter Desc
selector to remove the pop up menu and create the new trace.
For example, to enter the expression Log(M1+M2), touch the following
selectors in sequence: Log(, Mainframe, 1, +, Mainframe, 2, ), Enter
Desc.
Another example of a trace expression, M1 (2*Smooth(STO1,5)), is en
tered as Mainframe, 1, -, (, Mainframe, 2, *, Smooth(, Stored Traces,
STO1, ,, 5, ), ), Enter Desc.
The selectors presented in the DefTra pop up menu are grouped into the
following categories:
H Channel Selectors
11801C presents only those channel numbers where a sampling head is
installed.
H Numeric Keypad
expression, or one of the four arithmetic operators +, +, *, and /.
H Trace Functions
next page. This area of the menu is shared with the stored traces selec
tors described below. If the Trace Functions selector is highlighted, the
trace function selectors are shown. Touch the Trace Functions selector
to highlight it if the stored traces list is shown.
Trace Functions and Stored Traces can both be included in a single
trace expression.
NOTE
let you specify a sampling head channel. The
lets you enter a numeric value as part of your trace
let you specify a function, which are listed on the
NOTE
Reference