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User Manual
D750
DC Power Supply
3.2 Local Operation
3.2.1 Introduction
This Chapter describes the operating modes that are not involved in programming and
monitoring the power supply via its serial communication port (RS-232/485) or by remote
analog signals. Ensure that the REM/LOC LED on the front panel is Off, indicating Local
mode. If the REM/LOC LED is On, press the front panel REM/LOC button to change the
operating mode to local.
–For information regarding remote analog programming refer to sec. 4.1.
–For information regarding usage of the serial communication port refer to sec. 4.2.
3.2.2 Standard Operation
The power supply has two basic operating modes: Constant Voltage Mode and Constant
Current Mode. The mode in which the power supply operates at any given time depends on
the output voltage setting, output current limit setting and the load resistance.
3.2.2.1 Constant Voltage Mode
1. Inconstant voltage mode, the power supply regulates the output voltage at the selected
value, while the load current varies as required by the load.
2. While the power supply operates inconstant voltage mode, the VOLTAGE LED on the
front panel illuminates.
3. Adjustment of the output voltage can be made when the power supply output is enabled
(Output On) or disabled (Output Off).When the output is enabled, simply rotate the
VOLTAGE encoder knob to program the output voltage. When the output is disabled,
press the PREV button and then rotate the VOLTAGE encoder knob. The VOLTAGE
meter will show the programmed output voltage for 5 seconds after the adjustment has
been completed. Then the VOLTAGE meter will display "OFF".
4. Adjustment resolution can be set to coarse or fine resolution. Press FINE button to
select between the lower and higher resolution. The FINE LED turns On when the
resolution is set to FINE.
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