Datapulse 101 - Single Pulse; Gated Operation; Trigger Outputs

of the sine wave where the rise time is less than the minimum required,
it is necessary to incorporate a suitable pulse delay setting.
1. 5 SINGLE PULSE
The instrument may be triggered manually by a pushbutton for one
cycle (single or double pulse) of output.
1. 6 GATED OPERATION
External gate signal levels more positive than +1 volt are required
to enable the main pulse outputs for either synchronously or asynchronously
gated modes. Levels greater than 10 volts may not be applied.
1. 6. l Synchronous Gating
The repetition rate generator circuit is disabled in this mode of
operation until the unit receives an external gating signal. The generator
turns off again when the signal is removed. This synchronizes the first
main pulse of the gated burst to the leading edge of the gating signal and
stops the pulse train when the signal turns off. Both trigger outputs are
also gated.
l. 6. 2 Asynchronous Gating
In this mode, the time delay circuit is disabled while the repetition
rate generator operates continuously. Both the main pulse output and the
reference trigger begin with the first cycle occurring after the application
of the gate for either external or internal triggering. The advanced trigger
output is not gated and is available as a clock pulse on internally triggered
operations .
1. 6. 3 Coincidence Gating
This mode of operation is achieved by combining external gating
with external triggering so that the main pulse outputs occur only when the
two are coincident.
l. 7 TRIGGER OUTPUTS
The trigger outputs are positive with an amplitude of 2 volts from a
50 ohm source impedance and a duration of approximately 50 nanoseconds.
1. 7.1 Advance Trigger
This trigger is available on internally triggered operations only and
occurs approximately 10 percent of the repetition rate period before the
reference trigger.
1. 7. 2 Reference Trigger
The reference trigger occurs approximately 30 nanoseconds after
1-2