Keithley 2230-30-1 Guide - Portland State University
Contents
1. Portland State RSITY Department of D C P OW FR A amp Computer ngineering SUPPLY GUIDE Keithley 2230 30 1 Keithley 2230 30 1 DC Power Supply Guide v1 0 Portland State University 1 Introduction This guide provides instructions for operating the Keithley 2230 30 1 DC power supply The unit outputs DC voltage and current to supply external electrical circuits with power Features e Triple isolated DC output channels Each is independently adjustable o CH1 CH2 O to 30 V 0 to 1 5 A o CH3 Oto6V Oto5A e Overvoltage protection e Four digit voltage and current displays e Push button controls numeric keypad multipurpose knob e Double voltage and double current modes e Setup memory e Programmable Keithley 2230 30 1 DC Power Supply Guide v1 0 2 Instrument Front Panel Portland State University Readings or settings Top voltage Bot current Channel select e 650 Ea 3 B buttons Power button Readout display Arrow keys amp Enter button WSUS 222 30 1 TRIPLE CHANNEL DC POWER SUPPLY CH1 30V 1 5A CH2 30V 1 5A CH3 6V 5A IO Jar s o TOOS eo V Set I Set Menu LOCAL OUTPUT On Off function buttons Keypad Save Recall CH1 CH2 CH3 function buttons output connectors Figure 1 Keithley 2230 30 1 front panel Copyright Keithley Instruments Inc Power bu2. CH2 CH3 Press one of these buttons to select an output channel for adjustment such as changing the voltage limit or current limit The selected channel is highlighted by an underline cursor on the readout Keypad Use the keypad to enter numeric values for the voltage or current limits of the selected output channel Keys for the digits O through 9 and the decimal point are available Enter key e After inputting a numeric value press the Enter key to complete entry e For Menu Save or Recall push Enter to select an item Esc key Use Esc to cancel a pending operation or to exit a menu Keithley 2230 30 1 DC Power Supply Guide v1 0 Portland State University Arrow keys e For adjusting a numeric value the left and right arrows move the cursor to individual digits within the value The up arrow increments the selected digit while the down arrow decrements it e In Menu mode the up and down arrows scroll through the list of available menu items Multipurpose knob e For adjusting a numeric value rotating the knob clockwise increments the value while rotating the knob counter clockwise decrements it e In Menu mode the knob scrolls through the list of available menu items Note When incrementing or decrementing a numeric value using the up down arrow keys or knob the currently underlined digit determines the step size Menu OUTPUT On Off function buttons e Menu Accesses the settings menu The up and down arr
3. Set menu item and press Enter 3 Select the Yes item and press Enter Note For all channels the default output voltage and current are 1 V and 0 1 A respectively with overvoltage protection disabled Keithley 2230 30 1 DC Power Supply Guide v1 0 Portland State University Appendix 1 Typical Output Terminal Connections e Although only channels 1 and 2 are shown in the drawings all three outputs work similarly e Although not displayed in the equivalent circuit drawings all practical power supplies have an internal source resistance Rs e The curved connections can be made by using insulated wire Single output isolated Equivalent Circuit Equivalent Circuit Load1 V The circuits are completely isolated from each other Figure 3 Connections for circuits requiring isolation Keithley 2230 30 1 DC Power Supply Guide v1 0 Portland State University Dual positive outputs common Equivalent Circuit ce O Load 1 a E Load 2 Q O Common reference Dual negative outputs common Common reference Equivalent Circuit v Negative amp positive outputs common m 1 i Load 1 Ce M Equivalent C LY ey pi ommon Circuit i Load 1 E g Load 2 gt rererence D er O i Load 2 V Vss is the op amp supply voltage Common reference Figure 5 Example of inverting operational amplifier with bipolar power supply 10 Keithley 2230 30 1 DC Power Supply Guide v1 0 App
4. eeded that are entered via the keypad arrow keys or knob Data entry is completed by pushing the Enter button 6 Enable the outputs The lt OFF gt message on the readout disappears Button to press OUTPUT On Off 7 Test your circuit 8 Once you are done testing disable the outputs The lt OFF gt message reappears Button to press OUTPUT On Off Keithley 2230 30 1 DC Power Supply Guide v1 0 Portland State University Example Set the voltage of CH1 to 5 volts with a current limit of 1 25 amperes 1 Select CH1 CH1 2 Set the voltage limit V Set 5 Enter 3 Set the current limit l Set 1 25 Enter 4 Negative Voltages To configure the 2230 30 1 to supply negative voltages the output connectors need to be physically wired in a specific way See Appendix 1 Typical Output Terminal Connections Regardless of the expected polarities all voltage and current limits are entered as positive numbers 5 Constant Voltage versus Constant Current Output The power supply is designed to provide either a constant voltage CV or a constant current CC to an attached load The existing voltage limit current limit and load determine whether the power supply attempts to keep the voltage constant or the current constant The 2230 30 1 automatically switches between these operating modes Example Suppose CH2 is set to 3 3 volts with a current limit of 0 25 amperes A
5. endix 2 Technical Specifications Portland State University Table 1 Manufacturer s specifications for 2230 30 1 model Output Channel 1 Output Channel 2 Output Channel 3 Voltage 0to30V 0 to 30 V Oto6V DC Output Rating Current 0to1 5A 0to1 5A Oto5A Voltage lt 0 01 3 mV lt 0 01 3 mV lt 0 01 3 mV Load Regulation Current lt 0 01 3 mA lt 0 01 3 mA lt 0 01 3 mA Voltage lt 0 01 3 mV lt 0 01 3 mV lt 0 01 3 mV Line Regulation Current lt 0 1 3 mA lt 0 1 3 mA lt 0 1 3 mA lt 1mVrms lt 1mVrms lt 1mVrms Voltage Ripple and Noise lt 3 mV p p lt 3 mV p p lt 3 mV p p Current lt 5 mA rms lt 5 mA rms lt 6 MA rms Setting Voltage 1 mV 1mV 1mV Resolution Current 1 mA 1 mA 1 mA Voltage 0 03 10 mV 0 03 10 mV 0 03 10 mV Setting Accuracy Current 0 1 5 mA 0 1 5 mA 0 1 5 mA Voltage 1 mV 1 mV 1mV Meter Resolution Current 1 mA 1 mA 1 mA Voltage 0 03 10 mV 0 03 10 mV 0 03 10 mV Meter Accuracy Current 0 1 5 mA 0 1 5 mA 0 1 5 mA 11 Keithley 2230 30 1 DC Power Supply Guide v1 0 Portland State University Appendix 3 References 1 Models 2220 and 2230 Multi Channel Programmable DC Power Supplies Data Sheet Keithley Instruments Inc 2 Series 2200 Multichannel Programmable DC Power Supplies User Manual Keithley Instruments Inc 12
6. ow keys scroll through the menu while the Enter key selects a menu item The Esc key exits the menu e OUTPUT On Off Enables or disables the DC outputs Each press of the button toggles the output state All three outputs are turned on or off simultaneously regardless of which channel is selected V Set I Set function buttons e V Set Sets the desired output voltage e Set Sets the maximum output current Notes 1 l Set determines the maximum current that an attached load is allowed to draw The actual load current may be any value between zero and the current limit If the load current exceeds the limit then the power supply switches to constant current mode 2 Set and l Set can be accessed at any time regardless if the output is enabled or disabled 3 Voltage and current limits for all three outputs are stored in non volatile memory so the power supply retains its last used settings even when it is turned off Keithley 2230 30 1 DC Power Supply Guide v1 0 Portland State University Save Recall function buttons Save Up to 30 setups can be saved to non volatile memory Each setup consists of the voltage limit current limit and protection setting When Save is pressed this message appears on the readout Save 1 30 X where X is amemory location from 1 to 30 Use the keypad up down arrow keys or knob to pick the desired location Press Enter to complete the save operation or Esc to cancel Recall P
7. reviously saved setups can be recalled from memory A setup consists of the voltage limit current limit and protection setting Recalling a setup will overwrite the existing limit and protection values When Recall is pressed this message appears on the readout Recall 1 30 X where X is a memory location from 1 to 30 Use the keypad up down arrow keys or knob to pick the desired location Press Enter to complete the recall operation or Esc to cancel Keithley 2230 30 1 DC Power Supply Guide v1 0 Portland State University 3 General Operating Procedure Note The symbol indicates a sequence of buttons to push For safe operation of the DC power supply follow this procedure 1 Turn off the power supply 2 Configure the output terminals as required See Appendix 1 Typical Output Terminal Connections 3 Connect your circuit to the power supply s output terminal posts 4 Turn on the power supply but do not enable the outputs yet 5 For each output you intend to use a Select the channel The underline cursor highlights the selected channel To select Buttons to press Channel 1 CH1 Channel 2 CH2 Channel 3 CH3 b Set the desired voltage limit and current limit for the selected channel To set Buttons to press Voltage V Set Numeric value Enter Current l Set Numeric value Enter Note Numeric value consists of digits and decimal point if n
8. s long as the load attached to CH2 does not use more than 0 25 A of current the power supply will keep the supplied voltage constant at 3 3 V The CV message is shown on the CH2 readout However if the load attempts to draw more than 0 25 A of current the power supply will limit the current to 0 25 A and allow the supplied voltage level to drop below 3 3 V In this case the CC message is displayed Keithley 2230 30 1 DC Power Supply Guide v1 0 Portland State University 6 Overvoltage Protection A channel s maximum allowed output voltage can be adjusted to protect sensitive test circuits from an accidental overvoltage condition When protection is on a user cannot enter a voltage limit larger than the defined maximum Protection can be turned on or off individually for each channel Here is the setup procedure 1 Press the Menu button 2 Select the Protection Settings menu item and press Enter 3 Select the Max Volt Set item and press Enter 4 Select the Max V CH1 or CH2 or CH3 item and press Enter 5 Select the On item and press Enter The display will change to show this MaxVoltage Set MaxVolt value V where value is the existing maximum in volts 6 Adjust the MaxVolt to the desired value 7 Resetting the Power Supply The power supply s settings can be restored to their factory default values by following these steps 1 Press the Menu button 2 Select the Default
9. tton This switch turns the entire power supply either on or off CH1 CH2 CH3 output connectors The power supply has three sets of output connectors one for each output channel Each set consists of positive and negative terminal posts Multipurpose knob Keithley 2230 30 1 DC Power Supply Guide v1 0 Portland State University Readout display A two line alphanumeric readout shows the state of the output channels CH1 CH2 and CH3 The top row displays the voltage in volts while the bottom row shows the current in amperes Underline Cursor Voltage Current CH1 30V 1 5A CH2 30V 1 5A CH3 6V 5A Figure 2 Sample readout output off CH1 selected e ifthe outputs are disabled off then one row displays the lt OFF gt message e ifthe outputs are enabled on the power supply senses the output values The readout shows the measured output voltage and the measured load current for each channel along with a CV or CC message to indicate if the channel is operating in constant voltage or constant current mode e Ifa voltage or current limit is being adjusted the readout temporarily displays the new value which blinks to indicate input mode Once entered the readout reverts to showing the measured value e An underline cursor highlights the channel that is selected for adjustment e If the settings menu is accessed the readout shows the existing values and options Channel select buttons CH1
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