IntroductionInterface NotesExamplesUNIVERSITY OF CALIFORNIA AT BERKELEYCollege of EngineeringDepartment of Ele ctrical Engine ering and Computer SciencesEE105 Lab ExperimentsHP 6235A DC Power Supply Tutorial1 IntroductionThe 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 separateknobs. 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 blacknumbers.• 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 theway clockwise. The −18 V output can be moved closer to zero (COM ground) by turning the Trackknob counterclockwise.• The power supply can be switched into a current-source mode by toggling the V/A button on the leftside of the METER section. For these labs you will only use the voltage mode, so the button shouldalways be out.Figure 1: HP6235A front panel.13 EXAMPLES 23 ExamplesHere 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 theTrack knob all the way clockwise, and verify that the needle points to the blue 9 marking at the topof 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 highervoltages. Other equipment is
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