HP 3562A Operating Manual page 229

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AUTO MATH
AUTO MATH
The HP 3562A's auto math feature allows you to program math operations using the Active
Trace k eys and the sof t keys in the MATH and MEAS DlSP menus. The curren t auto math
table is saved in nonvolatile memory inside the instrument and is not erased when power is
removed. Tables can also be stored in disc memory; see Chapter 11 for instructions. The next
two sections explain how to program and start the auto math table.
An important feature of auto math is that i t can be selected as a measuremen t display in the
linear, log and swept sine modes. This allows you to view the math resul t s while a measure­
ment is in progress.
The table is limited to twenty lines, but i t may fill with fewer than twenty lines depending on the
commands used. (The limit is 2 0 lines or 2 0 0 characters. ) The message in the top right corner
of the table "xxx Keys Left" tells you how many key strokes are available. Also, keep in mind
the instrurnent states under which you rnay run the auto math table. A table created to operate
on a given set of traces may not work if you (or the analyzer) provide different traces.
Programming the Auto Math Table
Comrnands are programmed in the auto math table in the same rnanner as they are executed
directly from the front panel. For example, to add trace B to the active trace, enter MATH, ADD,
TRACE B as a comrnand. Figure 9-17 shows this example in the auto math table. You can
select one measuremen t display for each trace, and the MEAS DiSP selections must precede
the MATH selections. To fill or edi t the auto math table, press AUTO MATH, which displays the
following menu;
9-14
EDIT
Displays the auto math table and i ts editing menu.
MATH
VIEW
Displays the auto math table but does not allow any edit­
MATH
ing. This is useful to display the table for plotting or saving
to disc.
START
Starts the auto math table; see the next section, "Starting
MATH
the Auto MaUl Table."