Keithley SourceMeter 2460 User Manual page 87

Model 2460 Interactive SourceMeter® Instrument User's Manual Section 9: Generating a high-current pulse train
Figure 53: TriggerFlow diagram used to generate a pulse train
The trigger model recalls the values in the source configuration list, triggers the voltage measurement
during the pulse level, and provides accurate timing of the pulse width and period using two trigger
event timers (event timer 1 and event timer 2).
Event timer 1 controls the pulse period, and event timer 2 controls the pulse width. For the most
precise timing, it is important that the Model 2460 is waiting at the Wait blocks when the timer events
are generated. To guarantee that the actual pulse width matches the programmed pulse width, the
Config Recall, Constant Delay, and Measure blocks must complete before the event timer 2 delay
elapses.
The Constant Delay block uses the measuredelay value to set the time delay between when the
pulse level is output and the measurement is taken. The measuredelay value is a calculated delay
that places the measurement as close to the end of the pulse as possible.
The Branch Counter block controls how many pulses are generated based on the value of the
points parameter.
2460-900-01 Rev. A / September 2014 9-7