Sequoia / Tahoe Series User Manual California Instruments
M447352-01 REV-A 161
Figure 5-97. Regulation Settings
Constant-Voltage/Current-Limit (CV/CL): CV/CL mode will
regulate the output voltage to the set value until the load current
reaches the current setpoint; after the Delay interval, if the current
equals or exceeds the setpoint, a fault condition will be
generated, and the output voltage will be programmed to zero
and the isolation relay opened. This effectively turns off the AC
source output in case of an overload condition, after the user-
programmable trip time-delay.
Delay: Sets the time duration that the output current could equal
or exceed the current setpoint before control action is taken. After
the delay, if CV/CC mode is selected, the output current will be
regulated to its setpoint; if CV/CL mode is selected, an
overcurrent fault condition will be generated, and the output will
be turned off. The Delay is programmable from 0.1-5 seconds.
Volt ALC: Volt ALC selects whether the automatic loop control,
ALC, is enabled. ALC provides improved output regulation and
accuracy by regulating the RMS value of the output voltage
through the action of a digital regulator that measures the output
voltage and controls it to equal the set point.
ON: ALC is enabled; regulation is accomplished through the RMS
digital regulator; if the RMS digital regulator exceeds its control
capability and could not maintain regulation, the output will be
shut down and a fault condition will be generated with the output
turned off and the voltage programmed to zero.
REG: ALC is enabled; regulation is accomplished through the
RMS digital regulator; if the RMS digital regulator exceeds its
control capability and could not maintain regulation, the output
will remain on, but the voltage will deviate from the setpoint, and
a fault condition will not be generated.
OFF: ALC disabled; regulation is accomplished without the use
of the RMS digital regulator, and shutdown that is dependent on
loss of regulation will not occur.
DC OFFSET Programs the DC offset value, V(DC), when in the
(AC+DC)-mode; entries with positive and negative polarity are
allowed. The AC component of the output voltage is set
separately using the VOLTAGE selection field (above) or through
the Dashboard screen; the default is zero. In AC-mode and DC
mode, this function is not available, and the function is listed as
“N/A”.
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