2pcs TN-42HK High precision Headphone Amplifier DB Level Meter Head w Backlight
Note: If you need a driver board, you can buy it at the following link:
https://www.ebay.com/itm/324235303185
https://www.ebay.com/itm/324235303185
Pointer material: Nickel silver strips
Pointer color: white
Pointer swing direction: from left to right
Pointer length: from the central axis to the needle end 23±1 mm
Pointer width: 0.45 ± 0.05 mm
The direction of use of the electric meter: vertical
Pointer color: white
Pointer swing direction: from left to right
Pointer length: from the central axis to the needle end 23±1 mm
Pointer width: 0.45 ± 0.05 mm
The direction of use of the electric meter: vertical
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 1000 uA ± 10%
3. Internal impedance: 600Ω± 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 place where the front end of the pointer and the center of the zero scale are combined is the reference pointer and the zero scale overlap. The allowable error is ±1mm
6. Balance: the allowable error range of the meter is ±1mm when the standard position is tilted forward and backward by 90 degrees
7. Pointer sticking: instantaneously 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 within 1/3 of the scale of the scale board
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, within one second from the beginning to the pointer indicating position
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, items 7-14 remain normal
2. Vibration test: After packaging, the meter will vibrate 4mm up and down 1,000 times per minute on the vibrating plate, 10 minutes in each direction. After this test, the 7-14 items remain normal
3. Impact test: After being packaged, the meter is dropped from a height of 30 cm on a 3cm thick wooden board, tested in X.Y.Z. three directions, and 7-14 items remain normal after this test.
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
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, items 7-14 remain normal
2. Vibration test: After packaging, the meter will vibrate 4mm up and down 1,000 times per minute on the vibrating plate, 10 minutes in each direction. After this test, the 7-14 items remain normal
3. Impact test: After being packaged, the meter is dropped from a height of 30 cm on a 3cm thick wooden board, tested in X.Y.Z. three directions, and 7-14 items remain normal after this test.
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 box to prevent foreign objects from entering the inside 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 tin temperature: hold the solder gun temperature at 350℃, contact the terminal for 3.5 seconds, the front end of the terminal is about 3mm in contact with the solder gun, and the 7-14 items remain normal after this test
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 marking is less than 1/3 of the length of the scale, and it will return to the zero position after three seconds.
5. Bulb specification: white light LED 12V 20mA
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 box to prevent foreign objects from entering the inside 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 tin temperature: hold the solder gun temperature at 350℃, contact the terminal for 3.5 seconds, the front end of the terminal is about 3mm in contact with the solder gun, and the 7-14 items remain normal after this test
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 marking is less than 1/3 of the length of the scale, and it will return to the zero position after three seconds.
5. Bulb specification: white light LED 12V 20mA
Package：2pcs TN-42HK High precision Headphone Amplifier DB Level Meter Head w Backlight
Shippment:
1.We provide free shipping to international via China Post Airmail, and every parcel will be registered with tracking number. We can also ship by UPS/EMS/DHL/FedEx for alternative shipping method for corresponding fees. Please let us know before payment if You need split shipment.
2. International shipping requires complicated shipping procedures (such as both countries customs, transit stations etc.), also will be affected by many factors, such as holidays, weather conditions etc, If you have not received your shipment within 30 days from payment, Please contact us.
3.Time of Delivery:Based on the China Post Airmail and our experience, kindly please be that that To United States / United Kingdom / Australia, it takes around 10-15 business days; To Canada, it takes around 12-18 business days To Brazil / South America, it takes around 25-35 business days. To Italy / France / Spain / Germany/ Eastern Europe, it takes aournd 15-20 business days.
Returns & Replacements & Repair:
We accept returns & replacements within 30 days from the day the customer receive the products, please make first contact within 30 days from receiving the order. Products should be returned in original condition. As a benefit to our customers, we also provide repair within 3 Months from the day when thi
