Model 6517B Electrometer Reference Manual Section 7: Triggering
6517B-901-01 Rev. C / August 2015 7-23
For example, assume that a Model 6517B is connected to two Model 7001 or 7002 Switch Systems
for semi-synchronous operation, as shown in the next figure. All three instruments are programmed to
use trigger line #1. The two Model 7001s/7002s have relay settling times of 10ms and 50ms,
respectively. The Model 6517B is designated as the trigger control source and the two Model
7001/7002 units as trigger control acceptors.
Assume that the Model 6517B initially performs a measurement. After the reading is done, the Model
6517B drives the trigger line low. The negative-going edge triggers both Model 7001s/7002s to close
a channel. While the Model 7001s/7002s are in the process of closing a channel, they hold the trigger
line low. Ten milliseconds after switch closure, the first Model 7001/7002 releases the trigger line.
However, the second Model 7001/7002 continues to hold the line low since it is not finished. Fifty
milliseconds after switch closure, the second Model 7001/7002 releases the trigger line. The positive-
going edge triggers the Model 6517B to make a measurement and subsequently pull the trigger line
back down to close the next channels. This process continues until all channels are scanned and
measured.
Semi-synchronous trigger link example
The below example uses the same test system that was used for the Asynchronous trigger link
example #1. However, triggering is done using the semi-synchronous mode.
Figure 86: Typical semi-synchronous mode connections
Trigger link connections are shown in this figure:
Figure 87: Trigger link connections (semi-synchronous example)
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