Contemporary Electronics
Resources
A_New_Microscope.pdf (5 MB).
Electron_Emission_in_Intense_Electric_Fields.pdf (300 KB).
Field_Currents_from_Points.pdf (348 KB).
Field_Emission_and_Field_Ionization.pdf (1.2MB).
Fowler-Nordheim_Tunneling_into_Thermally_Grown_SiO2.pdf (416 KB).
Further_Studies_in_the_Emission_of_Electrons_from_Cold_Metals.pdf (968 KB).
On_the_Early_History_of_Field_Emission_Including_Attempts_of_Tunneling Spectroscopy.pdf (6.4 MB).
On_Tunneling_in_Metal-Oxide-Silicon_Structures.pdf (476 KB).
AC Adapter.zip (508 kB).
Card Edge Connector.zip (556 KB).
Exposure Mask.zip (404 KB).
FEEM Apparatus.zip (7.2 MB).
FEEM Demo Apparatus.zip (6.9 MB).
Printed Circuit Board.zip (160 KB).
Serial interface.zip (1.8 MB).
CEsoftware.zip (356 KB).
LabVIEW version 7.1 or greater is required.
Download LabVIEW 7.1.
Student Workstation
A Global Specialties Pro-S Lab Station (http://www.globalspecialties.com/) is used as a Student Workstation. A student workstation consists of a solderless breadboard and a removable, regulated power supply (+5 VDC @1A, ±12 VDC @250mA). A grounding adapter plug can be placed on the end of the AC line cord to minimize ground loop noise provided its ground connection is not used. Electrical safety considerations are not compromised by using an ungrounded adapter plug. See Figure 1.
Figure 1. A Student Workstation
Card Edge Connector Instructions
The Card Edge Connector is a printed circuit board that provides an interface between a student’s nanoammeter and a breadboard. A socket for the nanoammeter and two coaxial Bayonet Naval Connectors (BNCs), labeled IN and OUT, are mounted on the printed circuit board. See Figure 2.
Figure 2. The Card Edge Connector
A row of 25 pins is soldered to the printed circuit board below the socket. The pins are spaced 0.1" apart and will plug into 25 adjacent sockets on your breadboard. Pins 1-13 provide connections to the analog circuit on the nanoammeter board. Pins 14-25 provide connections to the digital circuit. The BNC labeled IN provides a shielded cable connection to the op-amp input on the nanoammeter board (pin 4), and the BNC labeled OUT provides a shielded cable connection to the op-amp output (pins 10 and 11). See Figure 2.
Figure 3. Card Edge Connector Wiring
Assemble the Breadboard
Connect the DC power supply cable to the adapter board positioned at the right side of the breadboard. Notice how the +5 V, ±12V and ground (GND) outputs connect to several breadboard terminals. See Figure 1.
Position the Card Edge Connector
Plug the pins of the Card Edge Connector into adjacent sockets of the breadboard. Connect pin 12 or 13 to the +12 VDC and pin 2 to –12 VDC outputs on the breadboard power supply. Connect only one of the pins labeled GND to ground on the power supply to avoid a ground loop. See Figure 4.
Figure 4. The Card Edge Connector
Insert the nanoammeter into the Card Edge Connector with the nanoammeter components facing the row of pins on the Card Edge Connector. Turn the DC power supply ON or OFF by plugging its AC power cord into or out of a wall receptacle.
power supply is turned ON.
