Keithley 4200A-SCS - Page 260

Model 4200A
-SCS Parameter Analyzer Reference Manual Section 5: Pulse measur
e and pulse generator units
4200A-901-01 Rev. C / February 2017 5-67
Trigger mode
With the software trigger source selected, using the pulse_trig function selects one of the
following trigger modes and initiates (triggers) the start of pulse output:
• Continuous: This trigger mode continuously outputs pulses when pulse output is started.
• Burst or Trig Burst: These trigger modes output a burst of pulses when pulse output is started. A
burst is a finite number of pulses (1 to 2
32
-1). The only difference between burst and trig burst is
the behavior of trigger output (refer to Pulse generator card output trigger (on page 5-68
)).
When using the burst or trig burst trigger mode, make sure to first set the pulse count before starting
pulse output. The pulse_burst_count (on page 13-138) function is used to set the burst count.
Example LPT function sequence: Basic triggering
The following LPT function sequence uses the software trigger to initiate a 3-pulse burst for both
channels, where both the pulse and trigger output three pulses:
// Stop pulse generator output:
pulse_halt(VPU1);
// 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 trigger burst mode and trigger start of burst output:
pulse_trig(VPU1, 2);
Pulse-measure synchronization
Synchronize the pulse-measure operation of a pulse generator card.