Difference: UsingHighVoltage (1 vs. 5)

Revision 52016-11-04 - TomErikHaugen

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Ramping High Voltage

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The high voltage is connected to the Keithley power supply. See also Controlling the Power Supplies.
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The high voltage is connected to the Keithley power supply. See also Controlling the Power Supplies. The sensors can be damaged by applying the voltage with the wrong polarity or too qucikly, so the script Control.py stops the user from doing that.
 
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Monitor that the current is stable. It should spike when the voltage is changed then settle to a lower value. The Compliance current limits the maximum current output and should be set low enough that the sensor does not get damaged. If the current hits the compliance current and stays there then continuing to increase the voltage will not do anything (as it is already being limited).
 

Operating Voltages

  • The DAQloads run at -400V

Turning on HV

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  1. Make sure that the HV cables are correctly connected.
  2. Turn on the Keithley power supply
  3. Set the compliance current to 500nA
    • press the edit button twice
    • the up and down arrows surrounding the "auto-range" button change the scale
    • use the up and down arrows labeled edit to adjust the value.
  4. Turn on the output.
  5. Change the output voltage in steps of -10 Volts at a time.
    • press the edit button once
    • use the edit arrows to decrease the values in the tens place.
    • The current should spike (on the scale of tens of nano Amps). wait for the current to settle then take another step
    • Keep going until the voltage reaches minus 400V
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  1. Make sure that the HV cables are correctly connected.
  2. Turn on the Keithley power supply
  3. in the terminal window run Control.py
  4. Run the command ramp_hv with the following arguments:
    1. give the target voltage after the -v flag
    2. give the voltage step size after the -s flag
    3. give the time delay after the -t flag
    4. set the compliance current (in microamps) after the -I flag
  5. If there are any problems and you want the script to stop, press Ctrl+C to stop the ramping process. Then either change the voltage through the script again (ramp it back down), or take manual control of the machine (press the "local" button then change the voltage by hand).
  -- Tom-Erik Haugen - 2016-10-14

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Revision 42016-10-21 - TomErikHaugen

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Ramping High Voltage

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The high voltage is connected to the Keithley power supply.
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The high voltage is connected to the Keithley power supply. See also Controlling the Power Supplies.
 

Operating Voltages

  • The DAQloads run at -400V

Revision 32016-10-14 - TomErikHaugen

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META TOPICPARENT name="WebHome"

Ramping High Voltage

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  1. Set the compliance current to 500nA
    • press the edit button twice
    • the up and down arrows surrounding the "auto-range" button change the scale
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    • use the up and down arrows by the V, I, R buttons to adjust the value.
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    • use the up and down arrows labeled edit to adjust the value.
 
  1. Turn on the output.
  2. Change the output voltage in steps of -10 Volts at a time.
    • press the edit button once

Revision 22016-10-14 - TomErikHaugen

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Title

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Ramping High Voltage

 
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Article text.
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The high voltage is connected to the Keithley power supply.

Operating Voltages

  • The DAQloads run at -400V

Turning on HV

  1. Make sure that the HV cables are correctly connected.
  2. Turn on the Keithley power supply
  3. Set the compliance current to 500nA
    • press the edit button twice
    • the up and down arrows surrounding the "auto-range" button change the scale
    • use the up and down arrows by the V, I, R buttons to adjust the value.
  4. Turn on the output.
  5. Change the output voltage in steps of -10 Volts at a time.
    • press the edit button once
    • use the edit arrows to decrease the values in the tens place.
    • The current should spike (on the scale of tens of nano Amps). wait for the current to settle then take another step
    • Keep going until the voltage reaches minus 400V
  -- Tom-Erik Haugen - 2016-10-14

Revision 12016-10-14 - TomErikHaugen

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Title

Article text.

-- Tom-Erik Haugen - 2016-10-14

Comments

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