Basic Idea:

• Note: We have new field mapping apparatus that are located in the non-Major's storeroom, shelf L5. Jeff will create new setup instructions after the Spring 2024 semester!
• Measure the potential field of two "charges"

• 7

	What:	How Many:	Where:
	Conducting paper mounted on foam board	1	Majors storeroom, shelf E1
	Digital multimeter	1	Majors storeroom, locked in steel cabinet
	Meter probe (red)	1	Majors storeroom, hanging in the center aisle
	36" or 48" black wire	1	Bewkes 231 (Phys 152 Lab)
	9-volt DC battery	1	non-Majors storeroom, shelf L3
Place two extra multimeters on the instructor's bench (for spares)
	Digital Multimeter	2	Majors storeroom, locked in steel cabinet
The following components are installed on front bench; Ask Jeff if we're using Two single- or One Dual-power supply!
	Either: Dual power supply (Tenma 72-7245 preferred)	1	Majors storeroom, shelf C2
	Or: 40v regulated power supply	2	Majors storeroom, shelf C2
	Digital Multimeter	1	Majors storeroom, locked in steel cabinet
	Wires	Black 12" – 2 Red 12" – 1 Black 24" – 2 Red 24" – 2	Bewkes 231 (Phys 152 Lab)

Notes:

• Lab setup (see the photo details page as well as the wiring diagrams below):

  

• Main power supply connection:
  • Note: The big power supply in the stockroom is used to distribute voltage to the lab benches from the lab power supplies. Jeff will take care of this following his instructions for configuration with an external power supply
  • A power supply on the instructor's bench is used to provide ±15 V to all the connected boards. Depending on availability, one dual-power supply (each side set to independent) will generally be used (Figure 1). If a dual-power supply is not available, two single-power supplies are connected in series (Figure 2)
    • Note that Figures 1 and 2 show a green wire connecting the power supply's GND connector to the green ground on the power panel. A 12" black wire is used for this connection
  • Set the power supply voltage as follows (note that this procedure is illustrated in the Instructor Notes for the Photoelectric Effect):
    • Connect the black wire of the voltmeter to the green panel connector.
    • Connect the red voltmeter wire to the red panel connector, and adjust the right side power supply to +15V
    • Move the red voltmeter wire to the black panel connector and adjust the left side power supply to -15V

Figure 1: Connection of Dual Power Supply	Figure 2: Connection of Two Single-Power Supplies

• Board connection; follow the correct polarity for each board (-15V on the left screw head, +15V on the right):