What does it mean to have a resolution of 0 5 decibels

Imaging sensitivity.

The sensitivity of the camera is usually indicated by the minimum ambient illumination requirements, and the sensitivity of the monochrome camera is about lux), and the color camera is mostly above 1 lux. The camera is used for ordinary surveillance occasions; The camera is recommended for use at night or when ambient light is low. When used with NIR LEDs, low-light cameras must also be used.

In addition, the sensitivity of the camera is also related to the lens, which is equivalent to.

Summer sun 100000lux Cloudy outdoor 10000lux TV studio 1000lux 60cm table lamp 60cm desktop 300lux indoor fluorescent light 100lux dusk indoor 10lux What do you want to do? If you don't understand, you can add me.

According to the ordinary person's sense of hearing.

0 2 0 dB It's so quiet that it's almost invisible;

2 0 4 0 dB quiet, like a whisper;

4 0 6 0 dB average. Ordinary indoor conversation;

6 0 7 0 dB noisy, nerve-damaging;

7 0 9 0 decibels are noisy and nerve cells are destroyed.

9 0 1 0 0 dB Increased noise, hearing loss;

1 0 0 1 2 0 decibels are unbearable, and a minute of deafness is temporary.

Above 120 decibels: extremely deaf or totally deaf.

Stand twenty meters away and speak in a normal tone.

It is louder than a mosquito, similar to the sound of falling leaves.

Sound type Decibel number Mosquito buzzing Approx. 0-10 Leaf litter 0-10 Whispering 10-30 Talking 30-50 Talking in the class at the same time 70-90

The sound of cars on the road: 75-80, the sound of unsilenced motorcycles, trailers, 90-100, the sound of aircraft taking off and landing near the airport, 100-140

Electric drill construction 100-140

pH=2, if it is a strong acid, and if it is a monobasic acid, the concentration is, and in the same way, pH=5, then it is pH=-LGCH (ch represents the concentration of H ions).

According to the WTO 1997 standard, less than 25db is normal hearing; 26-40 dB for mild hearing loss; 41-60 dB for moderate hearing loss; 61-80db for severe hearing loss; More than 81 dB is very severe hearing loss. Congratulations, you have normal hearing, don't have any worries.

Hearing within 25db is normal, and the lower the number, the better.

Hearing is normal at -10 to 20 decibels.

The hearing range of a normal person is within 0 25db.

Guidance: Hello! It is necessary to check to confirm the diagnosis, and neurodeafness can take ATP CoQ oryzanol and vitamin B1, etc., and avoid spicy food. Keep your mood moving.

The intensity of the sound when x is set to 50 decibels;

The intensity of the sound when y is set to 45 decibels;

Then there are: 50=10logx; 45=10logyx=100000 ;y=

So: x y=

The intensity of 50 dB sound is times that of 45 dB sound.

Therefore, the difference is still relatively obvious, and the human ear can clearly hear the difference.

The difference between what the ears sound is not very big.

20 decibels: night in the countryside.

30 decibels: Desert night.

40-60 dB: The sound of normal conversation.

50-53 dB: the sound of the washing machine.

60-80 dB: Cars passing 10 meters away.

The difference between what the ears sound is not very big.

20 decibels: night in the countryside.

30 decibels: Desert night.

40-60 dB: The sound of normal conversation.

50-53 dB: the sound of the washing machine.

60-80 dB: Cars passing 10 meters away.

The best and most professional method is to use a decibel meter to test the size of the noise around you, the operation is simple, the results are intuitive, and the specific operation steps are as follows:

Prepare before use.

1.Use the "+" driver to open the battery cover on the back of the meter and attach four batteries to the battery holder.

2.Cover the battery cover back and tighten the locking screws using the "+" driver.

3.When the battery power is aging, the LCD panel will appear with a " flashing symbol, indicating that the battery power is about to run out of power at this time, and a new battery must be replaced.

4.When using a DC power converter, plug the output plug of the DC power converter ( into the DC 6V jack on the side of the meter.

Use. 1.Press the power switch.

2.Press level

The decibel meter is the most basic noise measurement instrument, it is an electronic instrument, but it is different from objective electronic instruments such as voltmeters.

How it works. The microphone converts the sound into an electrical signal, and then the preamplifier converts the impedance to match the microphone with the attenuator. The amplifier adds the output signal to the weighting network, weighs the frequency of the signal (or an external filter), and then amplifies the signal to a certain amplitude through the attenuator and amplifier, and sends it to the effective value detector (or external level recorder) to give the value of the noise level on the display.