Sequoia Series 163
6.4.2 Step and Pulse Transients
Step 1 : Set the functions that you do not want to generate transients to FIXed mode. A convenient
way to do this is with the *RST command. Then set the mode of the function that will generate the
transient to STEP or PULSe as required. For example, to enable the voltage function to generate a
single triggered output voltage change, use:
*RST
VOLTage:MODE STEP
Step 2 : Set the triggered level of the function that will generate the transient. For example, if the
previously programmed voltage function is going to step the output voltage amplitude to 135 volts upon
receipt of a trigger, use:
VOLTage:TRIGger 135
Step 3 : Select the trigger source that will generate the trigger. For example, to select the Immediate
use:
TRIGger:SOURce IMM
Trigger sources are discussed in detail under “Triggering Output Changes”
Step 4 : Only perform this step if you have selected PULSE as the transient mode in Step 1. Specify
the pulse count, the pulse period, and then either the duty cycle or the pulse width using the following
commands:
PULSe:COUNt 1 specifies 1 output pulse
PULSe:PERiod 1 specifies a pulse period of 1 second
PULSe:DCYCle 50 specifies a duty cycle of 50%
PULSe:WIDTh .5 specifies a pulse width of .5 seconds (not necessary in this case since
a duty cycle has already been specified)
Step 5 : Initiate the transient trigger system to enable it to receive a trigger. To enable the trigger
system for one transient event use:
INITiate
Example
The following example programs a voltage dropout for 2 cycles of a 120 volt, 60 Hz output. The dropout
begins at the positive peak of the output voltage waveform (90 degrees phase) and is triggered by
IEEE-488 bus trigger.
*RST Begin at power-on state
VOLT 120 Set initial output voltage (immediate-level)
FREQ 60 Set initial output frequency
OUTP ON Enable the output
VOLT:MODE PULS Enable output to generate pulses when triggered
VOLT:TRIG 0 Set the voltage dropout (triggered level)
PULS:WIDT .03333 Set pulse width for 2 periods
PULS:PER 0.0667 Set pulse period for 4 cycles
TRIG:SOUR BUS Respond to IEEE-488 bus triggers
TRIG:SYNC:SOUR:PHAS Synchronize triggers to internal phase reference
TRIG:SYNC:PHAS 90 Sets internal phase reference point to 90 degrees
INIT Set to Wait-for-trigger state
<device trigger> Send the IEEE-488 bus trigger
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