LFY-401F Static Voltage Decay Tester (Computer Type)
The main purpose
Under laboratory conditions, this instrument is suitable for determining the 

electrostatic properties of textiles and garments, solid materials, plastic 

films, fibers, yarns, carpets, decorative fabrics and other fabrics or sheet 

products. The instrument host consists of a corona discharge device and a 

probe detector. Using a given high-voltage electric field, the fabric is 

discharged for a fixed time to induce static electricity in the fabric, so as 

to detect the amount of static electricity, the half-life of static voltage 

decay, and the residual amount of static electricity to display the 

electrostatic performance of the tested fabric.
Technical indicators
1. The instrument consists of two parts: the host computer and the computer 

detection system, which can be tested by the timing method and the constant 

pressure method respectively.
2. Computer (computer) control, constant pressure and timing are optional, 

and data can be printed out
3. The measurement range of electrostatic voltage value is 0 ~ ±10kV
4. The half-life time limit range is 0～99.99s/m/h±0.01s
5. The diameter of the turntable is (200±4) mm, the rotation speed is 1500 

rpm, the distance from the center of the turntable to the center of the 

sample and the center of the electrode is (72±2) mm, and the diameter of the 

sensing electrode plate is (28±0.5) mm
6. Discharge time 0～99.99s/m/h ±0.01s
7. The instrument adopts a computer test system, which directly displays the 

instantaneous peak value and half-life value of the sample during high-

voltage discharge, and displays the decay curve of the voltage changing with 

time in real time. It can be set to display the decay rate and voltage value 

of each time period (time points can be input, such as: 0-60s, 0-120s, 0-

180s, 0-300s, 0-1000s, 0-2000s).
8. Automatic shutdown of high voltage and motor, safe and convenient 

operation.
10. Discharge distance between needle electrode and sample: 20mm
11. Measuring distance between the sensing electrode and the sample: 15mm
12. Sample size: 32mm×32mm
13. The instrument has been calibrated for static voltage measurement before 

it is issued.
14. Check as required before use, the oil cylinder in the main engine must be 

full of oil (transformer oil)
15. Power supply: 220V 50HZ 1.5KW.
Applicable Standards
GB/T 12703.1-2021Textiles- -Test methods for electrostatic propensity-
Part 

1: Test method using corona charging