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Model 6517B Electrometer Reference Manual
Notice that the Model 6517B is reset to BENCH defaults. With this selection, the electrometer stays
armed. Since the arm source and scan source are set to immediate, the Model 6517B waits in the
measure layer for a trigger.
With the channel trigger control of the Model 7001/7002 set for source, scan operation initially
bypasses the need for a trigger link trigger to close the first channel. Since arm spacing and scan
spacing are set to Immediate, the scan starts as soon as the scanner is taken out of the idle state by
pressing the STEP key.
To run the test and store the readings in the Model 6517B, press STORE on the electrometer, enter
the desired number of readings (ten), and press ENTER. The Model 6517B waits (with the asterisk
annunciator lit) for a trigger link trigger from the Model 7001/7002.
Press STEP on the Model/7002 to start the scan. The scanner's output pulse triggers the Model
6517B to take a reading, store it, and send a trigger pulse. The following explanation on operation is
referenced to the operation model shown in the next figure.
A
The BENCH RESET condition arms the Model 6517B and places electrometer operation at point
A in the flowchart, where it is waiting for a trigger link trigger. Note that since both the arm layer
and scan layer are programmed for immediate source, operation immediately drops down to the
measure layer at point A.
B
Pressing STEP takes the Model 7001/7002 out of the idle state and places operation at point B in
the flowchart. Since both the arm layer and scan layers are programmed for immediate spacing,
operation drops down to the channel layer at point B.
C
Since channel trigger source is set to source, the scan does not wait at point B for a trigger.
Instead, it bypasses "Wait for trigger link Trigger" and closes the first channel (point C). Note that
the bypass is in effect only on the first pass through the model.
D
After the relay settles, the Model 7001/7002 outputs a channel ready pulse (point D). Since the
instrument is programmed to scan ten channels, operation loops back up to point B, where it
waits for an input trigger. Note that bypass is no longer in effect.
E
Remember that the Model 6517B operation is at point A waiting for a trigger. The output channel
ready pulse from the Model 7001/7002 triggers the electrometer to measure DUT #1 (point E).
After the measurement is complete, the Model 6517B outputs a completion pulse
F
The pulse then loops back to point A, where it waits for another input trigger. The trigger applied
to the Model 7001/7002 from the Model 6517B closes the next channel in the scan. This triggers
the electrometer to measure the next DUT. The process continues until all ten channels are
scanned and measured.
6517B-901-01 Rev. C / August 2015
Figure 84: Operation model for asynchronous trigger link example
Section 7: Triggering
7-21
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