Front Panel Operation
57
Figure 5-2. Typical Power Supply Operating Curve
Programming Voltage
To program the output for 4.5 volts, proceed as follows:
n Press . The display will change from meter mode to indicate VOLTS.
n Press . If you discover a mistake before pressing , erase the incorrect value with the backspace
key .
n The display will return to the meter mode and indicate 4.5000 volts.
Note The power supply must be programmed for a minimal current in order to increase the output voltage
beyond zero. Normally, there is sufficient current to do this. If the power supply does not respond or the
Unr annunciator comes on, go to “Programming Current” and set the current to a small value.
Now raise the voltage by pressing (or rotating the Voltage control clockwise). Note that the voltage increases by
a specific increment (depending on the voltage resolution) each time you press the key and increases rapidly as you hold
down the key. To lower the voltage, press or rotate the Voltage control counterclockwise. Try to program a
voltage greater than the V
MAX
for your supply. Note that the display shows OUT OF RANGE.
Programming Current
Note You may program the power supply current without a load, but must have a load in order to draw output
current. If you do not have a load on the power supply, you may connect a short across the output
terminals for this procedure. Turn the power supply off before making any connections.
To program the output current to 1.3 amperes, proceed as follows:
n Make certain that the voltage is not programmed to zero.
n Press . The display will change from meter mode to indicate AMPS.
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