OPERATING INSTRUCTIONS
CONSTANT VOLTAGE/CONSTANT CURRENT
CHARACTERISTIC
The working characteristic of this power supply is called a constant voltage/constant current automatic crossover type. This permits continuous transition from constant current to constant voltage modes in response to the load change. The intersection of constant voltage and constant current modes is called the crossover point. Fig. 7 shows the relationship between this crossover point and the load.
For example, if the load is such that the power supply is operating in the constant voltage mode, a regulated output voltage is provided. The output voltage remains constant as the load increases, up until the point where the preset current limit is reached. At that point, the output current becomes constant and the output voltage drops in proportion to furt her increases in load. The crossover point is indicated by the front panel LED indicators. The crossover point is reached when the CV indicator goes off and the CC indicator comes on.
Similarly, crossover from the constant current to the constant voltage mode automatically occurs from a decrease in load. A good example of this would be seen when charging a
CONNECTING TWO POWER SUPPLIES IN SERIES
Two Model 1735A power supplies may be connected in series to provide a variable
Figure 7. Constant Voltage/Constant Current Characteristic.
When connected in series, the VOLTAGE controls of each power supply exercise control over a
Load current may be monitored from either supply; the readings will be identical since they are connected in series. Also, since the supplies are connected in series, it is only necessary to set the current limit on one of the supplies; the other may be set for maximum.
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