Measurement Computing Data Translation DT3034 User Manual page 108

Repetitive One-Shot
Use repetitive one-shot mode to generate a pulse output signal each time the board detects a
trigger (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.
In repetitive one-shot mode, the internal C/T clock source is more useful than an external C/T
clock source; refer to
Use software to specify the counter/timer mode as repetitive one-shot, the polarity of the
output pulses (high-to-low transitions or low-to-high transitions), the C/T clock source, and
the gate type to trigger the operation. Refer to
types and to page 98
Note: In the case of a repetitive one-shot operation, the pulse width is set to 100%
automatically.
Triggers that occur while the pulse is being output are not detected by the board.
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.
Figure 39 shows an example of a repetitive one-shot operation using the DT740 screw terminal
panel, an external gate (rising edge), a clock output frequency of 1 kHz (one pulse every 1 ms),
and a low-to-high pulse type.
Repetitive One-Shot
Operation Starts
External
Gate
Signal
1 ms period
100% duty cycle
Pulse
Output
Signal
Figure 39: Example of Repetitive One-Shot Mode
page 96 for more information on the internal C/T clock source.
for more information on gates.
page 99 for more information on pulse output
1 ms period
100% duty cycle
Principles of Operation
100% duty
cycle
107