2pcs P-55SI High Precision DB Meter Amplifier Audio Level Meter with Backlight

Electrical performance：

1. Standard test conditions: temperature 20℃, humidity 70%, when there is no difference in test results,

It can also be tested at room temperature and humidity

2.Current sensitivity: the pointer is at the zero scale to the maximum

scale (full scale position), the sensitivity is 250 uA ± 10%

3.Internal impedance: 650 Ω ± 10%

4. Insulation resistance: 500V DC plus 50M ohm or more for the outer box

of the meter and the electrical circuit. The insulation resistance of the meter housing and the electrical circuit is tested with a 500V DC voltage.

5.Zero position: The meter uses the standard posture, and the front end of the pointer and the center of the zero scale are used as the reference

 The pointer and the zero scale overlap allowable error of ±1mm

6. Balance: the allowable error range of the meter when the standard position is tilted 90 degrees back and forth ± 1mm

7.Pointer sticking: Instantly add the full-scale current three times the overcurrent, and slowly decrease to the reading of 1/2 of the current sensitivity, at this time the pointer will return to the scale of the scale board 1/3 range

8.Friction: When adding current to the meter

and slowly increasing or decreasing to a certain value, the error range of the indication point is ±1mm

9. Braking: Instantly add 2/3 of the current value of the scale plate, and the time required from the

beginning to the pointer indicating position is within one second

Special test：

1.Overload test: Input ten times the full scale current every five

seconds. This action is repeated nine times. Each time is 0.5 seconds,

after this test 7-14 items remain normal

2. Vibration test: After the meter is packaged, it performs 1,000 up and down 4mm vibrations per

minute on the vibrating plate, 10 minutes in each direction. After this

test, the 7-14 items remain normal

3.Impact test: After packaging,

the meter is dropped from a height of 30 cm on a 3cm thick wooden board,

tested in X.Y.Z. three directions, after this test, 7-14 items remain

normal

4. Reliability test: After 100,000 calibration point current input, the current sensitivity limit is still within the standard

5. Environmental impact test: temperature 50℃, humidity 85%, lasting 100 hours, after this test 7-14 items remain normal

6.Terminal tension test: the terminal must withstand 1 kg of tension and will not be affected for 60 seconds

Other：  

1. Operating temperature limit: -10℃ to＋60℃ RH 35 to 85%

2. Storage temperature limit: -20℃ to＋60℃ RH 35 to 85%

Do not place the meter under direct sunlight, and store the meter in

the packaging box to prevent foreign objects from entering the interior

of the meter

3. Soldering condition: put the terminal about 3 mm into the tin plate at 230℃ for 3.5 seconds

  After this test, 7-14 items remain normal

Soldering temperature: Hold the solder gun at 350℃, touch the terminal

for 3.5 seconds, and the tip of the terminal 3mm is in contact with the

solder gun

After this test, 7-14 items remain normal

4. Anti-static: Use dry nylon cloth to test three times in the same

direction on the surface of the transparent cover. The difference of the

pointer on the mark is less than 1/3 of the length of the scale, and it

returns to the zero position after three seconds.

5. Bulb specification: 3 yellow LED PCB parallel 1.8-2.0V 60mA

Package：

2pcs P-55SI High Precision DB Meter Amplifier Audio Level Meter with Backlight