Figure 4-7 Semi-Synchronous Trigger Link Pulse Specifications - Keithley 7002-HD User Manual

Model 7002-HD User's Manual
Figure 4-7
Semi-synchronous trigger link pulse specifications
» +5V
0V
Pulled Low by
first Instrument
For example, assume that a Model 2001 Multimeter is connected to two Model
7002-HD units for semi-synchronous operation as shown in
instruments are programmed to use trigger line #1. The two Model 7002-HD
mainframes have relay settling times of 10 milliseconds and 50 milliseconds,
respectively.
Figure 4-8
Typical semi-synchronous mode connections
IN
OUT
Trigger
Link
2001 Multimeter
Assume that the 2001 initially performs a measurement. After the reading is done,
the meter will drive the trigger line low. The negative-going edge will trigger both
Model 7002-HD switch systems to close a channel. While the Model 7002-HD
units are in the process of closing a channel, they will hold the trigger line low. Ten
milliseconds after switch closure, the first Model 7002-HD will release the trigger
line. However, the second Model 7002-HD will continue to hold the line low since it
Trigger on
Negative-going
Edge
Trigger Link
Cables (2)
Line #1
7002-HD Switch System
Return to
Trigger on
Positive-going
Edge
Released by
second Instrument
IN
OUT
Line #1
Trigger
Link
Section 4 topics
Front Panel Operation 4-29
Figure 4-8. All three
IN
OUT
Trigger
Link
7002-HD Switch System