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A. Pressing EX TRIG then STEP or SCAN on the Model 2182 places it at point A in
the flowchart, where it is waiting for an external trigger.
B. Pressing STEP on the Model 7001/7002 takes it out of the idle state and places
operation at point B in the flowchart.
C. For the first pass through the model, the scanner does not wait at point B for a
trigger. Instead, it closes the first channel.
D. After the relay settles, the Model 7001/7002 outputs a Channel Ready pulse. Since
the instrument is programmed to scan eight channels, operation loops back up to
point B, where it waits for an input trigger.
E. & F. Model 2182 operation is at point A waiting for a trigger. The output Channel
Ready pulse from the Model 7001/7002 triggers the nanovoltmeter to measure
DUT #1 (point E). After the measurement is complete, the Model 2182 outputs
a completion pulse (point F) and then loops back to point A, where it waits for
another input trigger.
The trigger applied to the Model 7001/7002 from the Model 2182 closes the next channel in
the scan. This triggers the nanovoltmeter to measure the next DUT. The process continues until
all eight channels are scanned and measured.
Triggering
7-11
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