Anti-static working surface, ground, chair and wristband resistance measurement method
Resistance measurement of anti-static work surface, floor, chair and wristband
A1 measurement preparation
It is required that the electrode to be tested and the electrode used for measurement be clean and should be cleaned with a volatile cleaning agent before measurement.
Once, after cleaning, wipe the surface with a clean low-cottage cloth and air dry for no less than 15 minutes.
The surface is dry and clean.
A2 test instrument requirements
The resistance value measured by the instrument is at least 10 times and less than 10 times the measured resistance value. When the measured resistance value
When less than 1×105?, the instrument should be able to provide an open DC voltage of 10V ± 1 V, when the measured resistance value is 1
In the range of X 105?-1×1011?, an open DC voltage of 100V ± 10V should be provided. Two more
The measuring leads should be relatively insulated.
A3 electrode requirements
Each cylindrical electrode has a weight of 2.5 kg ± 0.5 kg and a diameter of 63.5 mm ± 2.5 mm. each
The electrodes have contacts of an electrical conductor material having a Shore A grade (International Rubber Hardness Scale) hardness of 50 to 70.
A4 measurement method
A4.1 Earth resistance measurement
That is, measure the resistance between a point on a surface to a ground connection point or an electrostatic grounding device.
A4.2 Surface resistance measurement
That is, the resistance between two points on the surface is measured.
A4.3 First, identify one or more measurement positions for the electrode on the object to be measured, using one or more
The measurement positions indicate the points at which the surface is grounded in the use state.
A4.4 Place the electrode at the marked measurement position and adjust the test instrument to the appropriate output voltage.
Measure and record the resistance value after power up for 30 s.
A4.5 Record all ambient temperature and humidity measurements.
A4.6 The ground resistance measurement after installation of the working face is shown in Figure A1. The surface resistance measurement is shown in Figure A2.
A4.7 Ground resistance measurement after ground installation is shown in Figure A3. The surface resistance measurement is shown in Figure A4. Require each machine room
The ground resistance measurement and surface resistance measurement of the ground are performed at least 5 times, and 5 points are randomly selected each time.
A4.8 Chair ground resistance measurement is shown in Figure A5. Surface resistance measurements are shown in Figure A6. 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. Placed on it
The wheel or foot of the chair.
Note: When the electrode must be used as a person or supported by a conductive material, the electrode for measurement on the back of the chair
The external non-contact surface should be covered with an insulating material.
A4.9 The wristband resistance to ground is shown in Figure A7. Require the measuring instrument used to have visible or measured resistance values
Audible display signal, the electrical connection of the wrist strap utilizes a suitable connector for the plug and a rust-free
The iron hand contact plate with a size of at least 25.4mmX25.4mm is realized, and the operator wears a wristband and
Insert the free end onto the test instrument and the hand contact plate must be pressed until the device senses.