TN-90 VU Meter Audio Level Display Tube Amplifier DB Sound Pressure Meter w/ LED Backlight

TN-90 VU Meter Audio Level Display Tube Amplifier DB Sound Pressure Meter w/ LED Backlight

Description:
The VU meter is equipped with a backlight board, and the white LED light source is matched with the light plate to uniformly diffuse the light and solve the problem of LED light directivity. The hollow dial has a pure black background, and the graduation lines and characters show beautiful green light after power on.

Parameters:
● Pointer material: zinc white copper
● Pointer color: orange
● Pointer swing direction: from left to right
● Pointer length: 44 ± 1mm from the center axis to the needle end
● Pointer width: 0.45 ± 0.05 mm
● Electric meter use direction: Vertical

Electrical Performance:
● Standard test conditions: temperature 20℃, humidity 70%, if there is no difference in the test results, the test can also be performed at normal temperature and humidity.
● Current sensitivity: the pointer is in the zero scale to the maximum scale (full scale position) Sensitivity 960uA ± 8%.
● Internal impedance: 650Ω ± 10%.
● 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 by 500V DC voltage.
● Zero position: the standard position of the meter is used, and the point where the front of the pointer and the center of the zero scale are unified is the reference pointer and the zero scale overlap. The tolerance is ± 1mm.
● Balance: The allowable error range of the meter when the standard position is tilted 90 degrees forward and backward is ± 1mm.
● Pointer sticks: When the full-scale current triples the overcurrent in an instant and slowly reduces to the current sensitivity reading of 1/2, the pointer will return to the scale of 1/3 of the scale.
● Friction: When the current is added to the meter and slowly increased or decreased to a certain value, the error range of the indicated point is ± 1mm.
● Braking: instantly add 2/3 of the current value of the scale plate, within one second from the start to the position indicated by the pointer

Special Test:
● Overload test input ten times the full-scale current every five seconds, and this action is repeated nine times. Each time is 0.5 seconds, and the test remains normal.
● Vibration test: After the meter is packaged, vibration is carried out on the vibration plate 1,000 times per minute up and down 4mm, 10 minutes per direction. After this test, 7-14 items remain normal.
● Impact test: After the packaging of the electric meter, it is dropped from a height of 30 cm on a 3cm thick wooden board. The X.Y.Z. three-direction test is normal.
● Reliability test: After 100,000 times of current input to the calibration point, the current sensitivity limit is still within the standard Environmental impact test Temperature 50 ℃, humidity 85%, lasts 100 hours, after this test remains normal.
● Terminal pull test The terminal must withstand a 1 kg pull for 60 seconds without being affected.

Other Specification:
● Operating temperature limit: -10℃ to + 60℃, RH 35 to 85%
● Storage temperature limit: -20℃ to + 60℃, RH 35 to 85%
Note: Do not put the meter under direct sunlight, and store the meter in the packing box to prevent foreign matter from entering the meter.
● Soldering conditions: Place the terminal about 3mm in a tin plate at a temperature of 230 ° C for 3.5 seconds, and keep it normal after this test.
● Solder temperature: Hold the soldering gun temperature at 350 ℃, contact the terminal for 3.5 seconds, and the front end of the terminal is about 3mm in contact with the soldering gun. This test remains normal.
● Anti-static: dry nylon cloth is tested three times in the same direction on the surface of the transparent cover, and the difference between the pointers on the score is less than 1/3 of the scale length, and the position returns to zero after three seconds.
● Bulb: 2 white LED 2.8-3.0V backlight board

Package List:
1 x VU Meter