Thenfindedge - HP 1652B Getting Started Manual

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As an example,

the present for

Example of Pattern Duration (Greater Than)

This configuration tells the timing analyzer to look for the pattern you

specified that occurs for a period of time greater than 50 ns. Once the

timing analyzer has found the pattern, it can look for the trigger.

Choosing < (less than) forces glitch and edge triggering off, and the

timing analyzer triggers immediately at the end of the pattern that

meets the duration requirements. The fields with which you specify

edges and glitches do not appear in the menu. For instance, configure

the present for

field as shown below.

Example of Pattern Duration (Less Than)

The analyzer triggers when it sees the pattern you specified, and that

occurs for a period less than

ns. The pattern must also be valid for

at least 20 ns.

Then Find Edge

With the Then find Edge fields you can specify the edges (transitions)

of the data on which your timing analyzer triggers. You can specify a

positive edge, a negative edge, or either edge. Each label has its own

edge trigger specification field so that you can specify an edge on any

When you specify an edge on more than one channel, the timing

analyzer logically ORs them together to look for the trigger point. That

is, it triggers when it sees any one of the edges you specified. It also

ANDs the edges with the pattern you specified in the Find Pattern

fields. The logic analyzer triggers on an edge following the valid

duration of the pattern while the pattern is still present. To specify an

edge, place the cursor on one of the Then find Edge fields and press

SELECT. You will see a pop-up similar to that shown in the following

HP 16526/16538

Front-Panel Reference

Timing Trace Specification Menu

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