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Analog Out Control Voltages
Analog Out control voltages V
which the active source can be the front panel controls, the digital interface (RS232, USB, LAN or
GPIB) or the remote analog inputs CV and CC. V
rated output voltage and current (high range only) generate 0V to 5V at the rear panel V
terminals with respect to COM. I
or off, but V
goes to 0V when the output is off.
out
Warning! COM is referenced to the output control circuit and will be within ~1V of the
positive output potential. V
Parallel Operation in Master-Slave Configuration
Parallel operation in Master-Slave configuration permits higher output currents to be realized with
equal current sharing between units and control of both voltage and current from a single unit. All
units should be of the same type, i.e. same rated output voltage and current. The diagram shows
3 units connected in parallel. For equal current sharing each unit must be independently connected
to the load with pairs of wires of equal gauge and length to ensure equal voltage drops. Connect
the V
, I
and COM of the master to the CV, CC and RTN inputs of the slaves (set CV and CC
out
out
switches to Remote) as shown.
The voltage and current of the master can be set by either the front panel controls via the digital
interface, or by an external voltage applied to its own CV and CC analog control inputs.
Parallel Operation in Master-Slave Configuration
In constant voltage mode the voltage across the load is that set on the master unit by its front panel
controls, via the digital interface or by the analog CV remote control input. The current limit for the
system (i.e. the current in constant current mode) is the current limit set on the master x n, where n
is the total number of units connected in parallel.
Isolated or Series Operation in Master-Slave Configuration
Isolated or Series operation in Master-Slave configuration permits tracking output voltages and
current limits to be set for multiple units from a single instrument. All units should be of the same
type, i.e. same rated output voltage and current. The diagram shows 2 units connected in series for
tracking ±Volts and tracking current limits. Connect the V
CC and RTN inputs of the slaves (set CV and CC switches to Remote) as shown.
20
and I
are generated from the actual internal control voltages, for
out
out
out
always corresponds to the set current, whether the output is on
out
and I
are always present on the terminals.
OUT
OUT
and I
are scaled such that 0 to 100% of the
out
Notes:
1. Units can be wired for CV (constant
voltage, CC (constant current) or both
(both shown). Set CV and/or CC
switches of slaves to Remote.
2. Connect outputs in parallel using equal
length wires to the load.
3. If remote sensing is required use only
remote sense from the master to the
load.
4. For constant current operation set the
required voltage overhead on the master.
, I
and COM of the master to the CV,
out
out
and I
out
out
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