Keithley KPCI-3101 Series, User Manual

Page: 50 / 146

2-30 Principles of Operation KPCI-3101 — KPCI-3104 Series User’s Manual
Figure 2-19 shows an example of performing a one-shot operation using an external gate input
(rising edge), a clock output frequency of 1kHz (pulse period of 1 ms), a low-to-high pulse type,
and a duty cycle of 99.99%.
Figure 2-20 shows the same example using a duty cycle of 50%.
Figure 2-19
Example of one-shot mode using a 99.99% duty cycle
Figure 2-20
Example of one-shot mode using a 50% duty cycle
Repetitive one-shot
Use repetitive one-shot mode to generate a pulse output signal each time the board detects a trig-
ger (determined by the gate input signal). You can use this mode to clean up a poor clock input
signal by changing its pulse width, then outputting it.
When the one-shot operation is triggered (determined by the gate input signal), a pulse is output.
When the board detects the next trigger, another pulse is output. This operation continues until
you stop the operation.
Pulse
Output
Signal
External
Gate
Signal
99.99% duty cycle
One-Shot Operation
Starts
1ms period
Pulse
Output
Signal
External
Gate
Signal
50% duty cycle
One-Shot Operation
Starts
1ms period