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Local Operation
3-10 975-0200-01-01
Standard Operation
The power supply can be controlled by two methods, either from the front
panel or from any of the remote interfaces. Front panel control is referred
to as local operation (default setting) while control via any of the remote
interfaces is called remote operation. To set up the power supply for
remote operation, see
Chapter 5, “Remote Operation”. Once the remote
connection has been established, the power supply can switch seamlessly
between local operation and any digital interface (RS-232, RS-485,
GPIB, USB and Ethernet).
Local lockout is a feature that allows the front panel to be locked so that
accidental button presses are ignored. This feature is often used to lock
out the front panel while a user is controlling the power supply from a
remote location.
The output of the power supply has two modes of operation: Constant
Voltage (CV) mode (see
page 3–11) and Constant Current (CC) mode
(see page 3–11). Both of the operating modes are available regardless of
which control method (local or remote) is used.
Operating Modes
The output mode in which the power supply operates at any given time
depends on the following factors:
• Output voltage set point V
SET
• Output current set point I
SET
• Impedance of the attached load R
L
The two output modes of operation are Constant Voltage (CV) mode (see
page 3–11) and Constant Current (CC) mode (see page 3–11).
Output enabled When the output is turned on, both the voltage and current rise as quickly
as possible to try and reach the set points (V
SET
and
I
SET)
that
were
configured prior to enabling the output. Initially the unit will operate in
CV mode, which is the default mode. As the voltage and current rise to
meet the requirements of the load, the set point that is reached first (based
on the R
L,
either
V
SET
and
I
SET
) will determine which mode the power
supply will remain in. The operating mode is indicated by either the CC
mode LED or the CV mode LED, one of which will illuminate on the
front panel.