Equipment List:

1. Helmholtz Coils and Bulb Set up
   • Coil Base
   • 2 x Coils attached to the base
   • Mirror Scale
   • e/m Tube
   • 250 V T2A Fuse
2. 6 x Red Banana Cords wired as follows:
   1. Make sure both power supplies are unplugged before starting!
   2. ( + ) terminal of DC high current power supply → 10A terminal of the left side DMM
   3. Left DMM Comm Terminal → red terminal of the front helmholtz coil
   4. Left terminal of AC high current power supply → left terminal of Filment input on the coil base
   5. Right terminal of AC high current power supply → right terminal of Filment input on the coil base
   6. Right most terminal of the high voltage power supply → the V/Ω terminal of the right side DMM
   7. Into the red wire that is already plugged into the right most terminal of the high voltage power supply → the left (red) terminal of the acccerlation voltage on the coil base
3. 4 x Black Banana Cords wired as follows:
   1. Make sure both power supplies are unplugged before starting!
   2. ( - ) terminal of DC high current power supply → red terminal of the rear helmholtz coil
   3. Black terminal of the front helmholtz coil → red terminal of the rear helmholtz coil
   4. Center terminal of the high voltage power supply → the Comm terminal of the right side DMM
   5. Into the black wire that is already plugged into the center terminal of the high voltage power supply → the right (black) terminal of the acccerlation voltage on the coil base
4. 2 x Multimeters (DMM)
5. 2 x High Voltage Power Supply
6. 2 x High Current Power Supply
7. 2 x Power Cords
8. Light Hood
9. Bar Manget

Notes and tests:

• Only Touch The Bulb With Gloves On
• Power Settings:
  1. Set all power knobs on both supplies to 0 by turning them counter clockwise until the stop.
  2. Turn on both power supplies by flipping the power switches.
  3. On the DC portion of the High Current Power Supply:
     1. Turn the Voltage Knob to max by turning it clockwise until it stops.
     2. Turn the Current Knob (A) to until the current reading is 3.1A ± 0.1A.
     3. Check that the current reading on the power supply and the DMM agree to ± 0.02A.
     4. Turn the Voltage Knob to 0 by turning it counter clockwise until it stops.
  4. Set the AC Voltage on the High Current Power Supply (H) to 6.3V. Turn the knob slowly or you will blow the fuse.
  5. On the DC portion of the High Voltage Power Supply:
     1. Turn the left most (50V) knob to 0 by turning it counter clockwise until it stops.
     2. Slowly turn the 500 V knob up by turning it clockwise until you see a beam appear in the bulb.
     3. Do Not Exceed 200 V.
     4. If a beam does not appear by 200 V, reduce the voltage to 0 V and return to try again in 10 minutes.
     5. Check that the voltage reading on the power supply and the DMM agree to ± 0.2V.
     6. Turn the 500 V Knob to 0 by turning it coutner clockwise until it stops.
  6. Double check that the High Current DC Voltage is set to 0 V and the High Voltage DC Voltage is set to 0 V.
  7. Turn off both power supplies.
• If the Filament on the bulb does not start glowing in 3 seconds, it is likely the fuse.
• If the beam is faint or diffuse, the bulb may need to be replaced:
  1. Be cautious when handling the bulb, they will pop into shards of glass if broken and are the most expensive part of the set up.
  2. To remove the bulb, simply grab it by the bottom of the sphere and pull up while wiggling it a little bit.
  3. Wear cloth gloves when handling the new bulb.
  4. To Install a new bulb, ensure that the metal pins and plastic notch align properly. Once installed, the bulb should be able to rotate in Yaw by about ± 90°