Section 5: Pulse measure and pulse generator units
Model 4200A-SCS Parameter Analyzer Reference Manual
5-68
4200A-901-01 Rev. C / February 2017
Pulse generator card output trigger
When output trigger is enabled, an output pulse will initiate a TTL-level, 50% duty cycle output trigger
pulse. The trigger pulses are available at the TRIGGER OUT connector of the pulse generator card.
The figure below shows the behavior of output triggers (T
O
) for the three trigger modes. Notice that for
the Burst mode, output triggers continue even though pulse output has stopped. For the trigger burst
mode, output triggers stop when the pulse output stops.
Figure 201: Pulse generator card output trigger
The
(on page 13-153) function is used to enable or disable output trigger. Output
trigger can be set for positive (rising edge) or negative (falling edge) polarity. Use the
(on page 13-154) function to set the polarity of output trigger.
Example LPT function sequence: pulse-measure synchronization
The following LPT function sequence uses the software trigger to initiate a 3-pulse burst for
CHANNEL 1. The three output pulses will trigger the scope to perform three measurements. It
assumes the scope is configured to trigger on leading edge triggers from the pulse generator:
// Stop pulse generator output:
pulse_halt(VPU1);
// Turn off trigger output:
pulse_trig_output(VPU1, 0);
// Set the output trigger polarity to positive:
pulse_trig_polarity(VPU1, 1);
// Select Software trigger source:
pulse_trig_source(VPU1, 0);
// Set channel 1 for a burst count of 3:
pulse_burst_count(VPU1, 1, 3);
// Turn channel 1 on:
pulse_output(VPU1, 1, 1);
// Select the Trig Burst trigger mode and trigger start of burst output. Each pulse
will trigger the
// scope to perform a measurement.
pulse_trig(VPU1, 2);
