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Solenoid turns and corresponding turns tolerance

The number of turns of the electromagnetic coil should meet the specified requirements, and the number of turns of tolerance should be as follows:
Number of solenoid coils: 0~300 Corresponding to the number of turns tolerance: 0
Number of solenoid coils: >300~500 Corresponding number of turns: ±3 turns
Number of solenoid coils: >500~20000 Corresponding number of turns: ±0.6%
Number of solenoid coils:>20000~60000 Corresponding number of turns: ±1.5%
The number of turns of the electromagnetic coil can be measured using a coil number tester.
Test method for inter-turn voltage: Take a reference coil, and then take a coil as the measured coil. Apply the specified impulse voltage wave between the two coil terminals or the leading and ending lead wires. The test time is 1 s to 3 s. Compare the difference between the two oscillating oscillating waveforms. Compared with the reference waveform, the difference should be less than 20%.
The provisions of impulse voltage wave in daytime withstand voltage test:
Rated voltage U<60 Power frequency withstand voltage and inter-turn voltage test voltage ≥1000
Rated voltage 60≤U<300 Power frequency withstand voltage and inter-turn withstand voltage test voltage ≥2000
Rated voltage 300≤U<600 Power frequency withstand voltage and inter-turn withstand voltage test voltage≥2500

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