Anti-static working surface resistance measurement
Resistance measurement of anti-static work surface, floor, chair and wrist strap
A1 Measurement preparation
The measured object and the electrode used in the measurement are required to be clean, and should be cleaned with a volatile cleaning agent before measurement 2
After cleaning, use a clean low-cotton cloth to wipe the surface, and air-dry for no less than 15 minutes to make it
The surface is dry and clean.
A2 test equipment requirements
The resistance value measured by this instrument should be at least 10 times higher and lower than the measured resistance value. When the measured resistance value
When it is less than 1×105?, the instrument should be able to provide an open-circuit DC voltage of 10V±1V. When the measured resistance value is 1
In the range of X 105?—1×1011?, it should be able to provide an open-circuit DC voltage of 100V±10V. The other two
The measuring lead should be relatively insulated.
A3 electrode requirements
The weight of each cylindrical electrode is 2.5Kg±0.5kg, and the diameter is 63.5mm±2.5mm. Every
Each electrical connector has a Shao A (International Rubber Hardness Scale) electrical conductor material with a hardness of 50 to 70.
A4 Measurement method
A4.1 "Measurement of resistance to ground
is to measure the resistance between a point on the surface and a ground connection point or electrostatic grounding device.
A4.2 "Surface resistance measurement
is to measure the resistance between two points on the surface.
A4.3” Firstly mark one or more measuring positions for electrodes on the object to be measured, and use one or more
Each measurement position represents the point where the surface is grounded in use.
A4.4” Place the electrode on the marked measuring position, and adjust the test instrument to the appropriate output voltage at the same time,
Measure and record the resistance value 30s after power-on.
A4.5 It is necessary to record all the measured ambient temperature and humidity.
A4.6 The ground resistance measurement after installation of the working surface is shown in Figure A1. The surface resistance measurement is shown in Figure A2.
A4.7 "After ground installation, the resistance measurement to ground is shown in Figure A3. The surface resistance measurement is shown in Figure A4. Request each room
The ground resistance measurement and surface resistance measurement of the ground shall be carried out at least 5 times, with 5 points randomly selected each time.
A4.8 The measurement of chair-to-ground resistance is shown in Figure A5. The surface resistance measurement is shown in Figure A6. The chair-to-ground resistance measurement needs
Take a piece of conductive sheet material as the floor contact point, its volume resistivity should be less than 500n·cm, hardness
For Shore A hardness between 50 and 70, the contact area is not less than 254mmX254mm. Place on it
The wheels or feet of the chair.
Note: When the electrode must be used as a person or supported by a conductive material, the electrode used for measurement on the back of the chair
The external non-contact surface should be covered with insulating material.
A4.9 The measurement of the resistance of the wrist strap to ground is shown in Figure A7. The measuring instrument used is required to be visible or visible to the measured resistance value.
An audible display signal, the electrical connection of the wristband uses a suitable connector for the plug and a rust-free
The size is at least 25.4mmX25.4mm iron hand touch panel to achieve, the operator wears a wrist strap and
Insert the free end into the test instrument, the hand contact plate must be pressed tightly until the device senses.