B&K 1652, 1651A instruction manual

_______________________________________________________________________________________APPLICATIONS

Two Identical Positive Voltages With a Common Negative (Refer To Fig. 11)

Some electronic equipment requires two identical positive voltages with a common negative. A good example of this would be a digital car clock where there are two +12 volt inputs and a common negative. Using both supplies in the parallel tracking mode would provide the simplest hook-up and operation. This type of “split supply” operation is obtained as follows:

1.Select the TRACKING PARALLEL operating mode and set the A/B Metering to monitor the “A” supply.

2.Set the desired voltage and maximum current using the “A” VOLTAGE and CURRENT controls.

3.Connect a ground wire between the “A” supply’s negative terminal and the GND (green) terminal.

4.Turn off the power supply and the equipment to be powered during hook-up.

5.Connect the positive polarity inputs of the circuit to be powered to the positive (red) terminals of the supplies and connect the common negative input of the circuit to be powered to the “A” supply’s negative (black) or GND (green) terminal.

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Fig. 11. Typical Hook-Up Using Two Identical Positive Voltages and a Common Negative.