Oscyloskop podłączony do diody z latarki: skąd sygnał 50Hz 33mV w ciemności?

Question

Dzień dobry. Czy ktoś mógłby wyjaśnić mi to zjawisko? Oscyloskop podłączam do diody z latarki. Częstotliwość równo 50 Hz, wypełnienie 50%, Vp 32-33 mV. W ciemności, gdy zbliżam do światła, wszystko zanika. Nic z tego nie rozumiem.

ArturAVS · Answer

No shielding. Connect the ground of the probe to the metal housing of the diode. 10 mV/dz is quite high sensitivity. It certainly catches interference from the mains.

astony · Answer

Or maybe from your fingers. Try not to touch the electrode of the oscilloscope. (Some paper, cloth).

dzimus · Answer

Czy można to zjawisko wykorzystać do pomiaru jakichś wartości? Dlaczego po wartości odczytu spadają do zera po oświetleniu diody? >>21790283

_jta_ · Answer

Perhaps take care to ground the torch hand and ground in common with the oscilloscope?

jarek_lnx · Answer

When the diode is illuminated, its dynamic resistance decreases. The lower the resistance, the more strongly interference from the mains is suppressed.

_jta_ · Answer

If the oscilloscope has an input impedance of 1 MΩ (this is the standard), a photocurrent below the detection threshold with a typical meter already gives a lower diode impedance.

dzimus · Answer

Dioda się świeci?Dioda nie jest podłączona do źródła zasilania.Uziemienie jest podłączone.Ludzie kochani, o czym wy piszecie?Jest tutaj ktoś trzeźwy.Interesuje mnie biometria i metrologia ogólnie.Dlaczego rośliny mają różne potencjały tętniące z różną częstotliwością?

_jta_ · Answer

A photocurrent flows when it is illuminated . And how and to what? Why do plants have different pulse potentials at different frequencies? And do they have? Does the method of measurement generate them?

jarek_lnx · Answer

If you don't understand the answer then don't cast doubt on the consciousness of those responding, because that won't help you. People answer, normally, culturally and truthfully. All it takes is a bit of intelligence and a few simple experiments to observe when a 50Hz waveform appears on an oscilloscope, what the amplitude depends on and to deduce where it comes from. Is it even necessary to connect to a diode to see 50Hz? A little is easy to say... I don't know anything about waveforms from plants, but for other bio-potentials, protecting the signal from grid interference is a challenge.

aksakal · Answer

The electrical potential of a plant is generated by the movement of ions (K+, Na+, Cl-) across cell membranes.
The potential changes significantly in response to light, mechanical damage, temperature or the presence of pathogens.

Oscyloskop podłączony do diody z latarki: skąd sygnał 50Hz 33mV w ciemności?

Post #1

Post #2

Post #3

Post #4

Post #5

Post #6

Post #7

Post #8

Post #9

Post #10

Post #11

Didn't find an answer? Ask Artificial Intelligence

Topic summary