TN-73 High Precision VU Meter DB Power Discharge Mixer Power Meter, TN-73

Specification b>
1. moving part: moving coil type
2. Pointer Materials: Strips of nickel silver
3. Pointer color: Black
4. Swing Pointer Direction: From left to right
5. Pointer length: 30 +/- 1 mm from the center axis to the tip of the needle
6. Pointer width: 0.45 +/- 0.05mm
7. How to use: Vertical
8. Operating temperature limit: -10°C to +60°C and RH 35 to 85%
9. Storage temperature limit: -20°C to +60°C and RH 35 to 85%
10. Soldering condition: Put the terminal about 3mm into a tin plate with a temperature of 230 degrees C. The placement time is 3.5 seconds. After this test, 7-14 elements remain normal.
Temperature 11. Soldering: Hold the soldering gun at 350a ?? for 3.5 seconds, and the front end of the terminal is about 3mm in contact with the soldering gun. After this test, items 7-14 remain normal.
12. Anti-static: Use dry nylon cloth to test the transparent cover surface in the same direction for three times. Mark the pointer difference under 1/3 of the scale length, and return to zero after three seconds.
13. Bulb specification: 12W DC12V

Note: Do not place the meter in direct sunlight, and store the meter in the packing box to prevent foreign objects from entering the meter.
electric Performance b>
1. Test conditions: temperature 20 degrees C, humidity 70%, no difference in test results, can also be tested under normal temperature and humidity conditions.
2. Degree of electrical influence: Pointer sensitivity 1mA +/- 5% from zero scale to uppper scale (full scale position)
3. Internal impedance: 50 ohm +/- 5%
4. Isolation impedance: above 500V DC including 50M Ohm for the external meter box charging circuit. Isolation impedance between the meter case and the charging circuit is tested at 500V DC voltage.
5. zero position: the meter is in a standard position. The place where the front end of the pointer is integrated with the center of the zero scale is the reference. The permissible error of the overlap between the pointer and the zero scale is +/- 1 mm.
6. Equalization: Allowable error range ?? ± 1mm ​​​​when the standard position of the meter is tilted 90 degrees before and after use.
7. Wand: Instantly add three times the full scale current above the current, slowly reduce to 1/2 of the electrical influence reading, then the pointer will return to 1/3 of the scale.
8. Friction: The point error range indicates ??±1mm ​​when the electric current is added to the meter and slowly increased or decreased to a certain value.
9. braking: Immediately add 2/3 of the dial current, within one second from the start to the position indicated by the pointer.
Special test b>
1. Over load test: input ten times full scale current every five seconds, repeat the action nine times. Each time is 0.5 seconds, 7 to 14 items remain normal after this test.
2. Vibration test: After the meter is packaged, it is shaken up and down 4mm every 1000 times per minute on the vibration plate, 10 minutes in each direction. After this test, 7-14 items remain normal.
3. Impact resistance: The instrument was dropped from a height of 30cm to a 3cm thick edge after being packaged, and the test was carried out in three directions, XYZ, 7-14 items remained normal after this test.
4. Reliability test: Electrofluence limit remains standard radius after current inputs 100,000 correction point.
5. Environmental impact test: Temperature 50a ??, humidity 85%, lasting 100 hours, after this test 7-14 items remain normal.
6. Terminal tension test: The terminal must carry 1 kg tension, lasting 60 seconds.