Keithley 2001 Operator's Manual page 109

low, the trigger is suppressed. In other words, the trigger
does not occur until all instruments in the system are ready.
Trigger on
negative-going
edge
≈ +5V
0V
Pulled low by
source instrument
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Semi-synchronous Trigger Link specifications
For example, assume that a Model 2001 is connected to two
Model 7001 Switch Systems for semi-synchronous
operation, as shown in Figure
programmed to use trigger line #1. The two Model 7001s
IN OUT
Trigger
Link
2001 Multimeter
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Typical semi-synchronous mode connections
Semi-synchronous Trigger Link example
This example uses the same test system
was used for the Asynchronous Trigger Link example #1.
However, triggering is done using the Semi-synchronous
mode. Trigger Link connections are shown in
The two instruments are configured as follows:
2001-900-01 Rev. K/ August 2010
Trigger on
positive-going
edge
Released by
acceptor instruments
3-37. All three instruments are
Line #1
7001 Switch System
(Figure 3-29) that
Figure 3-38.
have relay settling times of 10msec and 50msec,
respectively. The Model 2001 is designated as the trigger
control source and the two Model 7001 units as trigger
control acceptors.
Assume that the Model 2001 initially performs a
measurement. After the reading is done, the Model 2001
drives the trigger line low. The negative-going edge triggers
both Model 7001s to close a channel. While the Model 7001s
are in the process of closing a channel, they hold the trigger
line low. Ten milliseconds after switch closure, the first
Model 7001 releases the trigger line. However, the second
Model 7001 continues to hold the line low since it is not
finished. Fifty milliseconds after switch closure, the second
Model 7001 releases the trigger line. The positive-going
edge triggers the Model 2001 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.
Trigger Link
Cables (2)
(8501)
IN
OUT
Line #1
Trigger
Link
Model 2001:
Idle state:
Bench reset = :INIT:CONT ON*
Arm layer:
Arm source = Immediate*
Arm count = 1*
Arm trigger control = Acceptor*
Scan layer:
Front Panel Operation
IN
OUT
Trigger
Link
7001 Switch System
3-77