Procedure for Parallel-Plate Field

1. allow the use of the thumb screws, mount the field plate representing the parallel plates on the underside of the table.

The carbon-coated side (black) with silvery parallel lines munt face outward from the bottom of the table.

2. Secure a sheet of white paper on the top side by depressing the tabletop down and siding the paper under the four rubber bumpers. Then select the plastic template that has the parallel plate pattern. Place the template holes through the short rods on the topside of the table. Trace the pattern of the parallal plates on the paper. These lines are directly above the silvery lines found on the field plate fastened on the underside.

3. Connect the DC power supply to the terminals of the field mapping table marked BATT, or OSC. See Figute 1. Switch to the 0-36V range.

4. Set the selector switch of the analog voltmeter (it comes with graduations and a pointer) to the 25 -volt scale.

5. Connect the black terminal of the voltmeter to the black terminal of the mapping table. Connect the red terminal of the voltmeter to the banana-plug terminal on the probe am.

6. With a pencil eraser, clean the brass hemisphere contact of the probe. Slide the arm of the probe with the hemisphere to the underside of the table. The arm with the pencil hole will side along the topside of the table and it will face you.

7. Position the probe about 6mm (1/4 inch) away from the positive (red) terminal of the mapping table. Adjust the rotary dial until you get a reading of 18V at the probe.

8. Move the probe until you locate a point with a reading of 18 volts. Place a pencil in the hole on the tip of the probe and mark the point on the white paper. Move the probe to another point about 25mm (1 inch) away that also reads 18 volts. Mark the point. Continue this procedure until you have marked 15 points that all are at 18 volts.

9. Connect the family of 18 -volt points by a smooth line; it may be a straight or a curved connection. Label this curve as 18 volts. This gives you the equipotential curve for 18 volts.

10. Relocate the probe for a point at 16 volts and repeat the procedure of steps 8 and 9 11. Repeat the procedure for voltages at 14 volts, 12 volts, 10 volts, 8 volts, 6 volts, 4 volts and 2 volts.