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Section 3. Local Operation
Standard Operation
Figure 3.1 Operating Modes
Note
current up to 1.5% over the model-rated maximum values. The power supply will
operate within these extended ranges, but we cannot guarantee full performance to
specification.
Constant
The power supply will operate in constant voltage mode whenever the load current
I
Voltage Mode
L
constant voltage mode, the power supply maintains the output voltage at the selected
Operation
value (V
To use the power supply in Constant Voltage mode, either set the current limit to
maximum by turning the current control to its extreme clockwise position, or take
the precaution of setting a desired maximum current, then set the voltage control to
the desired voltage.
Constant
The power supply will operate in Constant Current mode whenever the load
resistance is low enough that the load current I
Current Mode
setting I
Operation
output current at the selected value (I
requirements.
Setting the
Set the Current Limit by following the steps below:
Current Limit
1. Connect a shorting lead across the output terminals.
2. Turn the voltage control a half-turn clockwise.
3. Set the desired maximum current limit by turning the current control slowly
36
Output
Voltage
Constant Voltage
Mode Region
V
SET
0
0
The control circuits have been designed to allow you to set output voltage and
is less the current limit setting I
) while the load current I
SET
, or: I
> I
SET
L
SET
clockwise to the desired level.
V
R
SET
L
I
SET
V
SET
Crossover Point R
L
I
SET
V
Constant Current
R
SET
L
Mode Region
I
SET
Output
Current
I
SET
, or: I
< I
SET
L
varies with the load requirements.
L
. In constant current mode, the power supply maintains the
) while the load voltage varies with the load
SET
Operating Manual for XPD Series Power Supply
Where
R
Load Resistance
L
V
Output Voltage Setting
SET
I
Output Current Limit Setting
SET
(Note: I
= V
SET
L
SET
is greater than the current limit
L
/ R
). In
L
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