Use clamp ampere meter to measure the current and check if the heating power is normal.
用钳形表测量电流，检查发热功率是否正常。
2
This product is fully closed structure and can work in every moist (it still can normal working under water 1.5 meter), dust and corrosiveness environment.
整体式全封闭结构，确保在各种潮湿(可在水下1.5米处正常工作)、粉尘及腐蚀性环境中工作。
3
This added voltage is mainly power line frequency and its effect on the voltmeter reading will depend upon the normal-mode rejection capability of the meter.