Determination of charge mass ratio of electron by magnetic focusing method

1, the experimental process and sometimes can not find the spot (spot), why?

(1) brightness is not enough. The solution is to appropriately increase the brightness.

(2) has been added with a larger electric bias voltage (x direction or and Y direction), so that the

light spot off the oscilloscope screen. At this point, the deflection voltage should be reduced to

zero by adjusting the electric deflection knob.

(3) "zero adjustment" knob is used improperly, resulting in the light of the fluorescent screen. By

adjusting the "zero", you can find the spot.

2, when the negative to the electric deflection experiment, the external voltage meter pointer

will reverse deflection, resulting in the inability to read. Why?

When will the two junction voltage meter end switch, and the measured results of the voltage to

the minus sign.

3, after the end of the line, open the "electronic charge mass ratio tester" power, showing the

wave tube on what did not appear, why?

(1) "the electronic charge to mass ratio test instrument" on the "gray" knob to adjust too small,

the brightness is not enough;

(2) the wave tube has been damaged.

4, after the end of the line, open the "electronic charge mass ratio tester" power, found that

there are a lot of bright spots on the oscilloscope, and not in the center of the oscilloscope tube,

why?

(1) X plate ungrounded;

(2) switch K1 not hit to ground.

5, "voltage" voltage readings can not pass "at the beginning of the voltage adjustment" or "fine

tuning voltage" rotating transferred to the specified value, and why?

(1) "the electronic charge to mass ratio test instrument" on the "gray" knob to adjust too dark or

too bright, affects the voltage value;

(2) "the voltage meter" is not adjusted well;

(3) "knob" has been bad;

(4) the voltage meter is bad.

6, switch K1 to the bottom of the wiring column, the wave tube on the line does not appear on

the line. Why?

(1) the lower end of the switch K1 wiring column has not received the "electronic charge mass

ratio tester", "test power" on the;

(2) the switch K2 has been switched on, and the output of the DC regulated power supply has

been adjusted to the measured value, not from the "0".

7, open the "DC regulated power supply" switch, adjust the "output regulation" knob, the wave

tube on the graphics did not react, why?

(1) "DC regulated power supply" is short;

(2) "DC regulated power supply" on the fuse has burned off;

(3) "DC regulated power supply" has been bad, there is no voltage output;

(4) the connection between the "DC regulated power supply" and the K2 of the switch is

damaged.

Two, the 8 "ampere meter" in series, found that "wiring board" on the "ampere meter" pointer

does not move, why?

(1) this "amp" is being reversed;

(2) when the "ampere meter", the "DC regulated power supply";

(3) this "amp" is bad.

Two, the 9 "ampere meter" in series, found that the two meter reading a large difference, and

why?

(1) the operator is not facing the dial readings;

(2) one of the table or the two table of the mechanical zero adjustment is not good;

(3) one table or two table is broken.

10, the result of the error is large, why?

(1) the voltage value of the voltage meter deviates from the original value, while the operator

does not pay attention to the;

(2) "voltage meter" or "electric current meter" mechanical zero adjustment;

(3) "voltage meter" or "current meter" is bad.

matters needing attention

1 test lines in the use of high pressure, the operation should be careful, in case of electric shock;

2 in order to reduce the interference of other ferromagnetic objects need to be away from the

solenoid;

3 should be placed in the South than in the North solenoid;

4 focus points should be as small as possible, but not too bright, so as not to judge the quality of

focus;

5 in changing the direction of the current before, should first adjust the exciting current to zero,

then the change-over switch Ka, the current is reverse;

6 change the acceleration voltage U, the brightness of the light will change, then need to re

adjust the brightness.

If the adjustment of brightness after accelerating voltage changes, voltage adjustment to the

desired voltage value.

Michelson Interferometer Experiment

1 observation point light source of the non - Fixed - domain interference, the screen only to see a

large spot, can not see the interference fringes, how to do?

Shift walking beam expander, adjust the range of the laser tube, with M1, M2 screw, enable by

M1, M2 reflected the bright point can be roughly back to in the laser tube, when the incident

light and plate form an angle of 45 degrees. Then re fine-tuning M1, M2 behind the screw, the

screen two rows of light spot in the bright point coincide, coincident with the standard is the

bright point in pinstripes, other spot also had a pinstriped, put on the beam expanding lens and

screen will see interference fringes.

2 observation point light source of the non - Fixed - domain interference, the screen only to see

the interference of the arc, not to see the ring, how to do?

Regulate the horizontal tension screw and vertical tension spring screws, so the interference