Model T940 User Manual
Publication No. 980938 Rev. K
Advanced Topics 8-20
Astronics Test Systems
Table 8-7 covers the above bullets:
Table 8-7: Truth Table Describing Pass and Fail
Pass
Valid
Mode
Valid
Pass
Error
Qualified
Pass/Fail
Basis
CONDEN
Pass
Fail
NOT
Pass
NOT
Fail
X
X
H
L
X
L
H
H
L
L
X
L
L
X
H
L
L
H
H
H
L
L
X
H
L
L
H
H
L
L
L
X
L/I
L
H/I
H
X
X
X
H
L
H
L
L
H
X
X
H
H
H
L
H
H
L
L
X
L
H
H
H
L
L
H
H
H
L
H
H
H
L
L
H
H
L
L
H
H
L/I
L
H/I
H
Code: H=Yes/enabled/active; L=No/disabled/inactive; I=Indeterminate;
X=don’t care
As mentioned above, with the default settings, the cumulative results of
Pass/Fail are used to make the final Jump decision. In particular:
•
A cumulative Fail occurs if even one qualified pattern in the Seq.
Step has an Error.
•
A cumulative Pass can only occur if none of the qualified patterns
in the Seq. Step has an Error. And if the Pass Valid Mode is
enabled, none of the qualified patterns in the Seq. Step can have
a Capture Fault for Pass to occur.
Pipelined handling of Pass/Fail with default settings:
Since the Error signal (and Pass Valid, if used) are delayed by the pipeline,
these signals will not be aligned with the Jump Test made at the end of an
individual Sequence Step (or at the end of a Primary Sequence).
Thus to make a correct Jumping Decision:
•
The last N patterns before the end of the Sequence Step (or
primary sequence) will not be included in the accumulated
Pass/Fail decision.
•
The last N patterns of the previous Sequence Step will be
included. If these are not to be included in the accumulated
Pass/Fail Jumping decision, then they need to not produce any
Errors.
The easiest way to not produce any Errors (or Indeterminates) is to employ a
Qualified Pass/Fail basis and disable CONDEN for these N Patterns. Using
this method, Errors can still be: Recorded, Counted or Logged into the EAM if
desired.
Note 1
: A Capture Fault will generate an Error. This is discussed further in