UNIVERSITY OF CALIFORNIA AT BERKELEY College of Engineering Department of Electrical Engineering and Computer Sciences EE105 Lab Experiments HP 6235A DC Power Supply Tutorial 1 Introduction The DC power supply is simple so this tutorial only contains a few bulleted notes and a simple example There is an image of the front panel interface in Figure 1 2 Interface Notes The power suppy can output independent values on the 6V and 18 V outputs adjusted with separate knobs All outputs are always on though the analog meter can only display one value at a time For the 18 V outputs use the blue numbers on the analog meter For the 6 V output use the black numbers The Track knob is used to set the 18 V output as a proportion of the 18 V output setting If the 18 V output is set to 9 V then the 18 V output will be 9 V when the Track knob is turned all the way clockwise The 18 V output can be moved closer to zero COM ground by turning the Track knob counterclockwise The power supply can be switched into a current source mode by toggling the V A button on the left side of the METER section For these labs you will only use the voltage mode so the button should always be out Figure 1 HP6235A front panel 1 3 3 EXAMPLES 2 Examples Here are all of the steps necessary to set up 9 V and 9 V supply rails 1 Turn on the power supply with the lower left power button 2 Check to be sure the V A button in the METER section is out 3 Press the 18 V button in the METER section to view the voltage setting for that output Move the 18 V knob until the needle points to the blue 9 marking at the top of the meter 4 Press the 18 V button in the METER section to view the voltage setting for that output Adjust the Track knob all the way clockwise and verify that the needle points to the blue 9 marking at the top of the meter 5 Connect cables to the 18 V and 18 V output ports which will be 9 V and 9 V respectively 6 The power supply has a floating ground so you can cascade them in series to reach higher voltages Other equipment is earth grounded
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