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A programmable output value of the ac power
source/analyzer can operate in one of four modes:
FIXED, Step, Pulse, or List. The default setting is
FIXED mode, where the output will stay “fixed” at
the programmed value until another command is
sent to change it. The remaining three operating
modes constitute the Transient Subsystem. Output
transients are used to:
• synchronize output changes with a particular
phase of the voltage waveform
• synchronize output changes with trigger signals
• simulate ac line disturbances with precise dura-
tion and phase control
• create sequences of output changes
Output transients are triggered actions and will
cause the output of the ac power source/analyzer
to react in a manner defined by the selected mode.
What Programmable Functions can be
Controlled by the Transient Subsystem?
The 6800 series provides control of many output
parameters. Most of these can be programmed as
an output transient. The following output parame-
ters are subject to transient control:
• ac output voltage
• dc output voltage (Agilent 6812A and 6813A only)
• frequency
• phase (Agilent 6834A only)
• waveform shape
• ac voltage slew rate
• dc voltage slew rate (6812A and 6813A only)
• frequency slew rate
• peak current limit (6812A and 6813A only)
• rms current limit
• dwell time (List mode only)
Upon receipt of a trigger, an output parameter set
to Step, Pulse, or List mode will transition from an
immediate level (its initial output setting) to one or
more levels (successive output settings). The num-
ber of successive output settings is, in part, what
differentiates one transient mode from another.
What is a STEP Transient?
A Step transient generates a single triggered out-
put change (from an immediate output level to
ONE successive output level) of one or more of the
output parameters subject to transient control.
Only output parameters programmed to Step mode
will be part of the triggered action. The output
will remain at the final output level once the Step
transient is complete.
What is a PULSE Transient?
A Pulse transient generates a triggered output
change that returns to its immediate output level
after a programmed time period. A Pulse transient
can also be programmed to repeat the output
change more than once or continuously.
What is a LIST Transient?
A List transient generates a sequence of output
changes. Each output change of the sequence is
called a List point. All parameters subject to tran-
sient control can be programmed at each List point.
A List can contain up to one hundred points. The
list of points can be programmed to execute once
or to repeat from one to an infinite number of times.
Agilent’s 6800 series List points can be paced by
external triggers. When paced by triggers, the out-
put will remain at a particular List point until a
trigger is received. Only then will it proceed to the
next programmed point.
List points can also be paced by individual pro-
grammable dwell time parameters associated with
every point. Only when the dwell time for a partic-
ular List point expires will it proceed to the next
List point.
Once the List is completed, the output returns to
the immediate levels.
Agilent 6800 Series Output Transients