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The dc source is capable of providing a constant dc output of 15 volts with up to 3 amperes of current. It
is capable of sourcing peak currents of up to 5 amperes -- provided the peak current pulse does not
exceed 7 milliseconds, and the average current requirement does not exceed 3 amperes. The peak current
capability is illustrated by the dotted line in Figure 2-1.
The dc source can operate in either constant voltage (CV) or constant current (CC) over the rated output
voltage and current. Figure 2-1 shows a single range − two quadrant capability. This means that the dc
source is capable of sourcing as well as sinking current over the output voltage range from zero volts to
the rated voltage. This negative current sinking capability provides fast downprogramming of the output
of the dc source. The negative current is not programmable, and varies linearly from 1.2 amperes at the
full rated voltage, to 2.8 amperes at zero output voltage.
The operating point of the unit is determined by the voltage setting, current setting, and the load
resistance. In figure 2-1, operating point 1 is defined by the load line traversing the positive operating
quadrant in the constant voltage region. Operating point 2 is defined by the load line traversing the
positive operating quadrant in the constant current region.
NOTE:
If you attempt to operate the dc source beyond its output ratings, the output of the unit
may become unregulated. This is indicated by the UNR annunciator on the front panel.
The output may also become unregulated if the ac line voltage drops below the minimum
rating specified in Appendix A.
Appendix A documents the dc source's specifications and supplemental characteristics.
General Information - 2
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