PASCO Specialty & Mfg. SE-9639 User Manual download pdf (Page 13)

Franck-Hertz Experiment Experiment Procedure 1

012-14264A

Experiment Procedure 1

Adjust Operating Voltages

1. Connect all the cables and cords as shown in the section “Connect Cables and Cords” (page 7).

2. On the Tunable DC (Constant Voltage) Power Supply I, Tunable DC (Constant Volt-

age) Power Supply II, and the DC Current Amplifier, push in the Power Switch to the

ON position.

3. On the DC Current Amplifier, turn the CURRENT RANGES switch to 10

-10

A. To set

the current amplifier to zero, press the SIGNAL button in to CALIBRATION. Adjust

the CURRENT CALIBRATION knob until the current reads zero. Press the SIGNAL

button to MEASURE.

4. On the DC (Constant Voltage) Power Supply I, set the Voltage Range switch to -4.5 –

+30 V. On Power Supply II, set the Voltage Range switch to 0 – 100 V.

5. On Power Supply I, rotate the 0 – 6.3 V adjust knob until the voltmeter reads 3.5 V. This sets V

= 3.5 V (Filament Volt-

age). Note: The Argon Tube Enclosure may have a different suggested filament voltage. If so, use it instead of 3.5 V.

6. On Power Supply I, rotate the -4.5 – +30 V adjust knob until the voltmeter reads 1.5 V. This sets V

G1K

= 1.5 V (the volt-

age between the first grid and the cathode)

7. Rotate the 0 – 12 V adjust knob until the voltmeter reads 10.0 V to set V

G2A

= 10.0 V (Retarding voltage).

8. Rotate the 0 – 100 V adjust knob until the voltmeter reads 0 V. This sets V

G2K

= 0 V (Accelerating voltage).

9. Remember, allow the argon tube and the apparatus to warm up for 15 minutes.

10. When you have finished the above steps, check that V

= 3.5 V (Filament voltage), V

G1K

= 1.5 V (the voltage between

the first grid and cathode), and V

G2A

= 10.0 V (voltage between the second grid and anode – “retarding voltage”). If so,

the equipment is ready to do the experiment. Note: These are suggested settings for the experiment, but other values could

be tried. You can do the experiment by parameters that are marked on the Argon Tube Enclosure.

Note: Before switching on the power, be sure that all voltage controls are

turned fully counterclockwise.

NOTE: It is very important to

allow the argon tube and

apparatus to warm up for 15

minutes prior to making any

measurements.

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PASCO Specialty & Mfg. SE-9639 User Manual Page 13

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