LFY-401A Static Voltage Attenuation Tester

Main application
This instrument is suitable for measuring the static properties of fabrics, plastic films, carpets, decorative samples and other types of samples or various plate-like finished products under laboratory conditions. The main unit of the instrument consists of a corona discharge device and a probe detector. Using the given high-voltage electric field, the sample is discharged for a certain period of time to induce static electricity, thereby detecting the magnitude of the static charge, the half-life of the static voltage attenuation, and the residual static charge, to show the static charging performance of the tested sample.
Instrument features
The severity of the sample's charging is determined, on the one hand, by the level of the static voltage generated after the high-voltage discharge, and on the other hand, it is related to the duration of this static voltage. The rate of static charge loss on the sample is expressed by the static half-life, which is an important assessment indicator for testing the static properties of the sample.
The instrument consists of two parts: the main unit and the automatic control box. It can be tested using the timing method and the constant voltage method separately. The instrument directly displays the instantaneous peak value and the half-life value of the sample's high-voltage discharge using a digital voltmeter. It automatically turns off the high voltage and the motor, making the operation convenient.

Technical indicators
1. Measuring range of static voltage value: -10KV to 0, accuracy ±1%
2. Half-life time range: 0 to 99.99s/m/h, resolution: 0.01s
3. Diameter of the turntable (200 ± 4) mm, rotational speed 1500 rpm
4. Distance from the center of the turntable to the center of the sample and the center of the electrode is (72 ± 2) mm
5. Diameter of the induction electrode plate: (28 ± 0.5) mm
6. Discharge time: 0 to 9999s (the experiment is set at 30s ± 0.01s)
7. Discharge distance between the needle-shaped electrode and the sample: 20mm
8. Measurement spacing between the induction electrode and the sample: 15mm
9. Test size of the sample: 45mm × 45mm
10. The instrument has been calibrated for static voltage measurement before being issued
11. Before use, check as required. The oil cylinder inside the main unit must be fully filled (with transformer oil)
12. Power supply: 220V 50Hz 1.5kW.

Applicable standards
GB/T 12703.1-2021 Textiles - Test methods for static properties - Part 1: Corona charging method
GB/T 14447-2025 Test methods for electrostatic properties of plastic films - Half-life method
FZ/T 64082-2021 Base cloth for filter materials
JIS-L-1094 Test methods for static properties
ISO 18080-1-2015 Textiles - Test methods for assessing the static tendency of fabrics - Part 1: Test method using corona charging 
GB/T 6719-2009 Technical Requirements for Bag-type Dust Collectors 
Fabric sensing electrostatic tester, electrostatic attenuation performance tester, half-life, fabric sensing electrostatic instrument