13: LPT library function reference Model 4200A-SCS Parameter Analyzer
13-156 4200A-901-01 Rev. C / February 2017
For an initial trigger only setting, only the first rising or falling trigger pulse will start and control pulse
output.
For a trigger per pulse setting, rising or falling edge trigger pulses will start and control pulse output.
After the initial pulse, the pulse output, either continuous or burst, will be output based on the internal
pulse generator clock. If pulse-to-pulse synchronization is required over higher count pulse trains, use
the trigger per pulse mode.
There are four Trigger In sources:
• External, initial trigger only (rising): The first rising-edge trigger pulse applied to TRIGGER In
will start and control pulse output.
• External, initial trigger only (falling): Same as above, except the initial falling-edge trigger will
start and control pulse output.
• External, trigger per pulse (rising): Rising-edge trigger pulses applied to TRIGGER IN will start
and control pulse output.
• External, trigger per pulse (falling): Same as above, except falling-edge triggers will start and
control pulse output.
• Internal Trigger Bus: The internal bus trigger source is used for synchronizing multiple
PMU/PGU cards for standard pulse using the legacy pulse commands (pulse_vhigh,
pulse_vlow, pulse_width, and so on). This trigger source is used only by the 4220-PGU and
4225-PMU.
The internal bus trigger source is used for synchronizing multiple PMU/PGU cards for standard pulse
using the legacy pulse commands (pulse_vhigh, pulse_vlow, pulse_width, and so on). This
trigger source is used only by the 4220-PGU and 4225-PMU.
Example
pulse_trig_source(VPU1, 1)
Sets the trigger source to external – initial trigger only – rising.
Also see
pulse_trig (on page 13-152)
pulse_trig_polarity (on page 13-154)
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