Events - Keithley 708B Reference Manual

Models 707B and 708B Switching Matrix Reference Manual
Input characteristics:
•
The falling edge generates an input event and latches the internal drive low.
Output characteristics:
•
When the trigger is asserted, it generates a low pulse for the programmed pulse duration If the line is
latched low, a falling edge does not occur.
•
When the triggeris asserted and the line is latched low, the pulse duration is enforced, and then the
internal line drive is released.
•
A normal falling edge pulse generates when the internal drive is not latched low and the trigger is
asserted.

Events

Event detectors monitor an event. They have one input signal (the stimulus), which is the event that
they monitor (in some cases, the stimulus is an action in the system, like a timer expiring or a key
press). They have two optional output signals (see figure below). "Detected" reflects the detection
state of the event detector. If an event was detected, the detected signal is asserted. Event detectors
are usually coupled to something that consumes the events. When an event is consumed, the
detected state of the event detector is reset. Should an event be detected while the event detector is
in the detected state, the overrun signal will be asserted. You can only clear the overrun signal by
sending an ICL command.
707B-901-01 Rev. A / August 2010
Figure 71: Synchronous output trigger
Section 3: Functions and features
3-21