Under temperature: (20±2)°C; relative humidity: 30%±3%, the sample is rubbed with the specified friction material, and the sample is charged into the Faraday cylinder to measure the charge of the sample. Then convert it to the amount of charge per unit area. Technical description of the instrument: Under temperature: (20±2)°C; relative humidity: 30%±3%, the sample is rubbed with the specified friction material, and the sample is charged into the Faraday cylinder to measure the charge of the sample. Then convert it to the amount of charge per unit area. The measuring instrument is composed of a friction device and an electric charge measuring instrument. The friction device is composed of a roller friction machine or a friction rod, a backing plate, a cushion seat and an insulating rod. Charge measuring instrument: It is composed of Faraday tube, capacitor and charge meter. Fulfill the standard: GB19082-2009 Technical requirements for medical protective clothing YY-T1498-2016 Selection guide for medical protective clothing GB/T12703 Textile electrostatic test method The main technical indicators of the equipment bidding: 1. Electrostatic charge measurement range: 0.001µC～2µC 2. The friction cloth is nylon or acrylic, the size is 400mm×450mm 3. There are three samples in each of the warp and weft directions, and the size of the sample is 250mm×350mm 4. Power supply: AC220V 50Hz 5. Use environment: -10℃～45℃ 6. Volume: ∮500mm×1000mm 7. Weight: 25kg