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4.12.5 Operation details
The detailed step-by-step testing process is explained as fol-
lows using the flowchart in Figure 4-32. The block diagram
in Figure 4-33 helps track input and output triggers. While
triggers are shown in the flowchart, the block diagram clari-
fies the source and destination of each trigger. Refer to both
drawings for the following discussion.
NOTE
Once started, the entire testing process is
controlled by input and output triggering
(via Trigger Link) between the three in-
struments. Keep in mind the following
points about TRIGLINK triggering:
•
A trigger model layer can only re-
spond to an input trigger if
TRIGLINK is selected.
•
The arm layer and scan layer of a
trigger model can only output a
trigger if TRIGLINK is selected
and the Source bypass is enabled.
Output triggers for the channel lay-
er (switching mainframe) and mea-
sure layer (DMM) are always
enabled if TRIGLINK is selected.
•
With the Source bypass enabled,
operation is not held up (waiting for
trigger) on the initial pass through
that trigger model layer.
1. The DMM setup places its operation at point D1 (D for
DMM) where it waits for an input trigger.
2. Pressing the STEP key on Mainframe B places its oper-
ation at point B1 (B for Mainframe B) where it also
waits for an input trigger.
3. When the STEP key on Mainframe A is pressed, its op-
eration drops down into the Channel Layer and the scan-
ning sequence begins. This occurs because all three
layers of the trigger model are configured to use the trig-
ger link and the Source bypass is enabled.
4. After the first channel is closed (Scan Channel), an out-
put trigger (via line 2) is sent to the DMM. Mainframe A
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operation then loops up to point A1 (A for Mainframe A)
where it waits for an input trigger.
5. After the DMM receives the trigger, it performs a mea-
surement, stores the reading, and then outputs a trigger
(via line 1) back to Mainframe A to scan the next chan-
nel. Note that DMM operation always returns to point
D1 where it waits for another input trigger.
6. The triggering process between the DMM and the chan-
nel layer of Mainframe A continues until all channels in
the scan list (DUTs 1 through 20) are scanned and mea-
sured. Note that the last channel in the scan list is M1,
which opens all channels.
7. After channel M1 is scanned, Mainframe A passes the
testing process to Mainframe B by sending a trigger (via
line 4) to it. Mainframe A operation loops up to point A2
where it waits for a trigger. Note that channel M1 is not
measured because the trigger sent to the DMM is ig-
nored ("Trigger ignored" message displayed).
8. After Mainframe B receives the trigger, operation drops
down to the channel layer where the channels in its scan
list (DUTs 21 through 40) are scanned and measured.
This scan/measure process operates the same as the one
for Mainframe A (steps 4, 5, and 6).
9. After channel M1 of Mainframe B is scanned, the testing
process is passed back to Mainframe A by sending it an
output trigger (via line 3). Mainframe B operation loops
back up to point B1 where it waits for a trigger. Again,
note that channel M1 is not measured because the trigger
sent to the DMM is ignored.
10. After Mainframe A receives the trigger at point A2, its
operation drops down into the channel layer where its
channels (DUTs 1 through 20) are again scanned and
measured.
11. The testing process is again passed on to Mainframe B
by sending it a trigger. Mainframe A then goes into idle.
12. After Mainframe B receives the trigger (at point B1), its
operation drops down into the channel layer where its
channels (DUTs 21 through 40) are again scanned and
measured. Mainframe B then goes into idle.
Front Panel Operation
4-67
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