Pulse Output Synchronization - Keithley 4200-SCS Reference Manual

Model 4200-SCS Reference Manual
// 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);

Pulse output synchronization

External triggering can be used to synchronize the pulse outputs of multiple pulse generator cards.
The master pulse card can trigger itself and the other pulse cards to simultaneously start their
pulse outputs.
NOTE
External triggering
With a pulse card configured for external triggering, an external trigger source applied to the
TRIGGER IN connector will control pulse output. The
one of the following four external trigger sources (refer to
NOTE
NOTE
4200-901-01 Rev. S / May 2017
The 4200-PG2 does not support input triggering. Therefore, it cannot be used for
pulse output synchronization.
• External, initial trigger only (rising): The first rising-edge trigger pulse applied to Trigger
In will start pulse output. For the Continuous trigger mode, the initial trigger pulse will start
continuous pulse output. For the Burst and Trig Burst modes, the initial trigger pulse will
start the pulse burst.
In this mode, the pulse generator card will only look for the initial trigger. After this initial
trigger, all subsequent pulses output are gated to the internal pulse generator clock. For
continuous output, or high count burst output, the synchronization across pulse generator
cards will be gradually worsen. For deterministic pulse-to-pulse timing across cards, use the
Trigger per Pulse mode.
• External, initial trigger only (falling): Same as above, except a falling-edge trigger will
start pulse output.
• External, trigger per pulse (rising): Rising-edge trigger pulses applied to Trigger In will
start and control pulse output. For the Continuous trigger mode, each trigger pulse will
initiate one output pulse. If input triggers stop, pulse output will stop. Operation for Burst and
Trig Burst is similar, except pulse output will stop after the last pulse of the burst is triggered
(additional input triggers are ignored).
• External, trigger per pulse (falling): Same as above, except falling-edge triggers will start
pulse output.
4220-PGU and 4225-PMU: Do not use the two external falling trigger sources with
the positive trigger output polarity (see
that triggers itself and other slave cards. These two falling trigger sources should only
be used when an external piece of equipment is being used to supply the trigger
pulses to the Models 4220-PGU and 4225-PMU. This applies to all three pulse
modes (Standard Pulse, Segment ARB and Full Arb).
For the master pulse generator card, the polarity of the pulse trigger source and
pulse trigger polarity (
edge trigger source, the pulse trigger polarity must be positive. If using a falling-edge
trigger source, the pulse trigger polarity must be negative.This requirement applies to
all three pulse modes (Standard Pulse, Segment ARB and Full Arb).
Return to
pulse_trig_source
pulse_trig_polarity
function) must be the same. If using a rising-
pulse_trig_polarity
Section Topics
Section 11: Pulse Source-Measure Concepts
function is used to select
Figure 11-17):
on the master card
function)
11-33