Find Pattern - HP 1652B Getting Started Manual

Logic
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One of the options in the Base pop-up is ASCII . It allows you to see
characters that are represented by the pattern you specified in the
Find Pattern field.
Label
)
1 POD 1
I
Base >
1 ASCII
I
Find
Pattern
$
X
Figure 18-T. ASCII Defined as Numeric Base
Notice in the figure above that the Find Pattern field is no longer a
selectable field when the base is ASCII . You cannot specify ASCII
characters directly. You must specify a pattern in one of the other
bases; then you can switch the base to ASCII and see what characters
the pattern represents.
The Symbol option in the Base pop-up allows you to use a symbol that
has been specified in the Timing Symbol Tables as a pattern or specify
absolute and enter another pattern. You specify the symbol you want to
use in the Find Pattern field.
Find
Pattern
With the Find Pattern fields, you configure your timing analyzer to
look for a certain pattern in the data. Each label has its own pattern
field that you use to specify a pattern for that label.
During a run, the logic analyzer looks for a pattern in your data which
is the logical AND of all the labels' patterns. That is, it looks for a
simultaneous occurrence of the specified patterns. When it finds the
pattern, it triggers at the point that you specified in the Then f'ind Edge
fields. See "Then Find Edge" later in this chapter for more information
about edge triggering.
You select a Find Pattern field with one of two methods. The first
method is to place the cursor on the Find Pattern field and press
SELECT. The second method is to place the cursor on the Find
Pattern field and press one of the alphanumeric keys on the front-panel
keypad. Both methods give you a pop-up similar to that shown in figure
18-8.
HP 1652B/l653B
Front-Panel Reference
Timing Trace Specification Menu
w-7

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