Local Operation
3-12 M370430-01 Rev B
Standard (Local) 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 (page 3-42) 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 three modes of operation: Constant
Voltage, Constant Current , and Constant Power (available in version
2.21 and higher). All three 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
Note: the M10 Option includes a preset function to automatically
reset the output voltage to zero Volts at both power on and output
enabled, unless deliberately programmed otherwise (see Output
Protection, 3-36).
Output current set point I
S
ET
Impedance of the attached load R
L
The three output modes of operation are Constant Voltage (CV) mode
(see page 3-13), Constant Current (CC) mode (see page 3-13), and
Constant Power (CP) mode (version 2.21 and higher; see page 3-13).
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
I
, either V
SET
or 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.
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